REM PROS REVISION LEC CARDS Flashcards

1
Q

Why make the mouth healthy before starting dentures? (3)

A
  1. Dentures more comfortable if tissues healthy
  2. Dentures last longer (other treatment may
    change the fit of a denture, eg. extractions)
  3. Dentures can make dental disease worse
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2
Q

What oral structures are we making healthier (pre-denture)? (3)

A

Oral mucosa
Teeth
Periodontal tissues

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3
Q

What is denture stomatitis? List KEY facts to do w/ denture hygiene? (6) (Pre-tx; oral mucosa)

A

Definition: ‘Denture sore mouth’ localised non-communicable oral candida infection affecting the palate + gingiva (acute or chronic)
Caused by candida albicans

Key causes 1) poor denture cleaning 2) keeping denture in overnight
Assoc w/ angular chelitis (examine for this)

Tx:
nystatin oral suspension OR miconazole gel
Soak in Milton’s Solution for 2
weeks (not metal)
Leave dentures out overnight
Improve denture + OH

(Consider immunosuppression, pt risk suspectibility/ referral tests)

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4
Q

ORAL ULCERS - non-denture + denture related? (2) (Pre-tx; oral mucosa)

A

Mouth ulcers COMMON + should resolve in 2-3w (arrange review + urgent referral to OM for persistant ulcers of unknown cause)

Denture related = TRAUMATIC ULCER from poor fitting denture (remove cause e.g. over-extension of denture)

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5
Q

What is BRONJ? + how do we manage? (Pre-tx; oral mucosa)

A

Bisphosphonate related osteonecrosis of the jaw
Management = Referral

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6
Q

How do identify/manage denture if causing trauma / trauma rx ulcers? (3) (Pre-tx; oral mucosa)

A
  1. Assess if denture border too long for sulcus
  2. Identify area causing trauma w/ pressure paste + trim back w/ acrylic bur
  3. Temporary soft lining may help
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7
Q

How do you use pressure paste to identify area of trauma? (2) (Pre-tx; oral mucosa)

A

Apply pressure paste to edge of denture

Trim pink acrylic showing through w/ paste still there

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8
Q

How do you use soft linings to ease area of trauma? (3) (Pre-tx; oral mucosa)

A

Mix + apply to fit surface
Place in mouth to mould to shape
Trim excess (lasts weeks/months + allows tissues to recover)

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9
Q

What is denture granuloma? Management? (4) (Pre-tx; oral mucosa)

A

Definition = chronic inflammation (of upper arch that is denture rx

Management:
Remove cause (usually denture rx)
Review to see if reduced in size (several months)
Surgery (last resort)

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10
Q

Why manage caries + perio disease before starting dentures?(2) ; state tx (3) (Pre-tx; oral mucosa)

A
  1. Dentures attract plaque (any plaque rx diseases made worse)
  2. So, dentures fit the teeth in their final form

THEREFORE
Complete all direct + indirect restorations before
Plaque score < 20%
XLA of poor prognosis teeth + allow healing (6-8w)

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11
Q

Key considerations re tooth-wear before making dentures? (3) (Pre-tx; oral mucosa)

A

Decide what to do about worn teeth before making dentures (tx plan for worn teeth)
Restore before making dentures usually (eg. Composite or indirect restorations)

Tx will result in increased OVD (so, new OVD established before denture = better denture success)

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12
Q

Reasons for using articulated casts? (6) (;Articulated cast)

A

Easier to view incisal relationship from palatal aspect

To observe occlusion for denture design purposes (positioning of rests and assess interocclusal space)

Examine static and/or dynamic occlusion

Plan changes in OVD (wear cases)

Make diagnostic changes prior to irreversible treatment (composite build-ups/indirect restorations)

Use as a visual aid when discussing treatment options with patient

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13
Q

What material is used for primary impressions + why is a good primary impression important?

A

Alginate

An accurate primary impression means your special tray is a better shape + needs less modification to the borders

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14
Q

How/tips on selecting stock tray? (5)

A

Use imprint of teeth on a sheet of wax for tray selection

Be able to insert tray into the mouth w/o discomfort + comfortable when seated

Tray should touch occlusal surfaces on both sides to indicate it is seated

Tray covers all the teeth + soft tissues that you wish to record (or can be modified easily if under-extended e.g. using pink wax)

Be able to move tray sideways showing enough space for alginate between tray & tissues

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15
Q

How to get accurate reading of sulcus area?(8) -primary + secondary imps

A

1.Check tray extends to full height of the sulcus (2mm gap between tray + sulcus)

  1. Add double layer of wax to extend borders if tray too short in sulcus area
  2. Ensure frenal attachments not squashed (cut grooves in wax if too long)
  3. Pre-load some sulcus areas with alginate to avoid trapping air (esp labially)
  4. Ensure sufficient impression material where you need it (enough in the stock tray?)
  5. Seat tray correctly so that impression material can flow over tray borders correctly
  6. Border moulding (by pt +/ operator) whilst impression material setting
  7. Ensure detachable handle does not interfere with lip movement (is it fitted correctly?)
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16
Q

How do you manage gagging pt during impressions? (4)

A

Correct tray size - ensure impression tray (+ extensions) not too large

Impression material – right amount of impression material (not XS)

Impression material – fast-setting where possible

Distract patient during impression (deep, steady breathing, wiggle toes etc)

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17
Q

List 4 instructions for correct disinfection + storage of impressions (Alginate or silicone) (2)

A

Rinse – with water under the tap to remove debris
( low in sink/away from you to prevent splash back)

Disinfect – soak for required time (10 mins proform)

Rinse again - to remove chemicals

Alginates keep moist – wrap completely in damp gauze/tissue. Store in sealed bag to prevent drying out

Elastomeric impression materials (silicones) store dry and protect with paper or bubble wrap

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18
Q

11 Possible sources of error on final cast?

A

1.Using the wrong type of impression material

  1. Not using a material according to instructions
  2. The impression tray you are using is flexible
  3. Not rinsing off disinfectant before leaving clinic
  4. Not storing impression properly after it’s been taken
  5. Impression material distorts whilst casting
  6. Not using the correct type of stone
  7. Air bubbles trapped whilst casting impression
  8. Excess liquid inside the impression when casting
  9. Disturbing the model before stone set properly
  10. Damaging the cast during use
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19
Q

What shape should an impression border be?

A

should extend to the depth + width of the sulcus (as a denture flange that is too thin doesn’t to work well - include hamular notch in in impression + post dam)

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20
Q

What is the post-dam area?

A

= the junction between the hard-palate + soft palate

  • the border of a denture should be on non-moving but displaceable tissue

Identifying the post dam:
1. look at colour change between hard + soft palate
2. Identify fovea palatine (foveae palati)
3. Palpate junction w/ blunt e.g. flat plastic
4. Ask pt to say ‘aah’ + see where the vibrating line occurs

(Mark impression after disinfecting
(Sharpie pen good)

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21
Q

What is a functional impression?

existing denture version

A

Viscogel ‘impression inside fit surface of complete denture.

Let patient wear it for a day or so and then they give it back to you to send to lab for casting up master impression (or reline)

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22
Q

List 6 ways to reduce errors when casting? (8)

A

Cast ASAP + within 24 hrs (alginate ASAP, silicone not as urgent)

Ensure no debris/excess liquid inside impression when casting

Remove excess alginate from impressions borders where it might distort impression when sitting on the bench

Ensure plaster or stone mixed correctly + of correct consistency (not too thick or watery)

Run a thin layer of mix over teeth area first to avoid air getting trapped in teeth

Use vibrating table to eliminate air bubbles in mix

Leave stone in impression to set properly first before turning over to base the cast

Remove impression once cast is based (this prevents interaction of materials + surface damage)

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23
Q

What is meant by jaw relation? (2) (;jaw reg stage)

A

3D spatial relationship between the upper + lower jaws (or teeth)

Both a VERTICAL + HORIZONTAL component

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24
Q

What is meant by horizontal jaw relationship? (3) State rationale (1) (;jaw reg stage)

A
  • Two positions are intercuspal position (ICP) and retruded contact position (RCP) (aka centric relation)
  • Use ICP – when there are sufficient opposing pairs of posterior teeth to record a reproducible ICP
  • Use RCP/centric relation – if insufficient natural teeth to record ICP, or if the patient’s OVD is to be increased (typically wear cases)

Rationale = choose an horizontal occlusal rx that is reproducible + so kept the same throughout all stages of making a denture

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25
What horizontal rx do we use in wear cases and why?
even if someone has stable ICP, in wear cases you are increasing OVD so you are loosing stable ICP therefore we use RCP
26
Give the full definition of RCP
Retruded Contact Point A bilateral, unstrained position of the mandible in which the condylar disc assembly(CDA) is in the most anterior superior position (ASP) within the glenoid fossa. (GF) In this position, the initial 20mm of incisal opening is a pure ”hinge” movement around the hinge axis. If natural teeth are present, RCP is the point of initial tooth contact as the jaw closes around the hinge axis.
27
What is the ideal occlusion for PARTIAL dentures?
For **partial dentures use natural teeth** as a guide to denture position WHERE POSSIBLE i.e. **ICP** where it is reproducible Where the vertical dimension is determined by natural teeth but there are **NOT enough inter-cuspating posteriors** to determine horizontal jaw position **RCP** is used.
28
What happens to the denture occlusion if RCP is not equal to ICP? (horizontal occlusal error) (6) | 6 points
1. Instability and Rocking: The denture may become unstable during function, causing tipping or rocking, especially when the patient occludes in RCP. 2. Premature Contacts: Premature or uneven contacts occur, often causing the denture to dislodge or create pressure points. 3. Increased Wear: Excessive friction and sliding during chewing due to the discrepancy cause accelerated wear of the artificial teeth. 4. Tissue Trauma: Uneven forces can lead to soft tissue irritation, soreness, and potential ulceration. 5. Loss of Retention: Poor occlusal harmony can cause dislodgement during function, especially in the lower denture due to its mobility. 6. Patient Discomfort: The patient may experience difficulty chewing, jaw fatigue, or pain due to muscular imbalance.
29
How to test for ICP- RCP discrepancy? (horizontal occlusal error) (6)
**Clinical Examination:** Guide the mandible gently into RCP (retruded contact) and note where the first tooth contact occurs. Ask the patient to close into their habitual bite (ICP) and observe any sliding or deviation. **Chin Point Guidance:** Apply gentle pressure at the chin point to guide the mandible into RCP and compare it with ICP. **Use of Articulating Paper:** Check for uneven marks when the patient bites in RCP versus ICP. **Check for Slide in Centric:** Identify if there is a horizontal slide or lateral deviation as the patient moves from RCP to ICP. **Remount Procedure:** Perform a remount on an articulator to accurately evaluate and correct occlusal discrepancies. **Visual and Tactile Assessment:** Observe for signs of functional imbalance, such as denture rocking or asymmetrical occlusal pressure.
30
When do we need occlusal rims? (2)
To support casts when articulating Hand articulation not possible without rim (or interocclusal record alone not sufficient) (regardless of occlusal rims being needed we always need the intraocclusal record which relates the horizontal position between upper + lower jaws)
31
What ways can you articulate a study cast when using ICP? (2)
Hand articulated casts OR Facebow to articulate
32
Ways/process of articulating a study cast when using RCP?
(These casts cannot be hand articulated) Therefore to mount on an articular, you need: - occlusal rims - interocclusal record - facebow
33
What is the purpose of occlusal rims?
provide a shape to whoever is making denture on where to set teeth + to indicate where the lip support is and incisal edges etc **+ establish the vertical dimension**
34
What information helps us decide what shape to make the rims (and where to place teeth)? | 6 points
1. Previous dentures 2. Signs + symptoms 3. Biometric guides (draw pencil line on cast + set teeth in rx to this line) 4. Photos 5. Piezography 6. Natural teeth
35
Steps for taking a piezograph to determine optimum shape for lower denture (denture space)?
use soft material in lower arch usually, to record space between soft tissues (tongue, cheeks, lips etc.) 1. Maxillary denture or occlusal rim (adjusted) should be in the mouth 2. Ask patient to sip and swallow cold water 3. Leave ‘Viscogel’ in mouth for at least 5 minutes Convert the Piezograph to wax to make an occlusal rim Subsequently adjust rim to record vertical and horizontal jaw
36
Why use a facebow? (4)
* is used to record the 3D rx between the upper occlusal plane and the terminal hinge axis in the patient The facebow then transfers this relationship onto the articulator This enables the articulator to simulate the patient’s jaw movements better ..any restorations made on the articulator are more likely to conform to the patient’s occlusion + be more acceptable to the patient
37
What is the purpose of a face bow? (3)
To record the relationship between upper occlusal plane + terminal hinge axis in the patient Then use facebow to transfer this onto the articulator + the upper caste is articulated
38
State 3 considerations for jaw reg of edent pt
No guide of where pt's previous teeth were, so need occusal rims + inter-occlusal record for Jaw relationship Jaw relationship recorded in RCP Occlusal rims for e.dent pt can be made in wax, self-cure acrylic or heat- cure acrylic (Note for partially dentate pt heat-cure acrylic not used)
39
How do we measure freeway space for an edentulous patient? (5)
Ideally 2 - 4 mm for an edentulous patient Use a Willis gauge as a measuring tool Measure occlusal vertical dimension (OVD) w/ both dentures in Measure rest vertical dimension (RVD) w/ at least one denture out Calculate RVD- OVD = FWS
40
What could happen if there is not enough freeway space (FWS)? (4) (;edent pt)
* Might get soreness under one/both dentures (trauma may be visible on soft tissues) * Aching jaw muscles (OVD too excessive or not enough freeway space and no room to move) * Patient wants to leave dentures out because uncomfortable to wear. Patient may say “dentures feel too big or they feel like a mouth full” * Appearance may not be unacceptable - showing too much tooth/ or patient’s lips become incompetent because mandible & maxilla are too far apart
41
What could happen if there is **too much** freeway space (FWS)? (6) (;edent pt)
Might see deep creases at the corners of the patient’s mouth (both sides usually) Might see infection/redness/soreness at corners of the mouth (possibly angular cheilitis) May also have denture stomatitis on palate (possibly same time as angular cheilitis, because both can be candida related) Patient may complain of poor appearance (i.e.. poor lip support or reduced denture tooth height) Patient may have jaw/muscle ache because they are over- closed (OVD too small) Patient may show very worn denture teeth/and also have difficulty chewing food if occlusal surfaces flat or misshapen
42
Positioning artificial upper anterior teeth in denture patients? (6)
Match **denture teeth midline to midline of face** (nose and between the eyes when smiling or incisive papilla) **Incisal edges near (or 1-2 mm below) lower border of upper lip at rest.** **Lip support favourable** (approx. 90-degree angle between lower border of nose and upper lip profile looking from the side) **Match long axes of upper denture teeth with patient’s sagittal plane/midline** (symmetry and converging slightly inwards + downwards ideal) **Look at denture gingival margins + lower border of upper lip when smiling **(to see how much pink wax/acrylic is showing) Compare **denture tooth position against natural teeth** (eg. anterior overjet & overbite, or arch shape)
43
Reasons for surveying caste? (2) RPD
**Clasp planning** - to identify suitable undercuts on natural teeth for clasps **Blocking out** - to identify unwanted/undesirable undercuts on teeth **To identify guide planes (NGP or AGP)**
44
Do you need to articulate study casts? (1) RPD
Yes - may need to take a jaw registration to articulate primary casts to help design denture (FOR CO-CR WE NEED TO)
45
Define PATH OF INSERTION (RPD)
The path of insertion is the path followed by the denture from its initial contact with the teeth until it is fully seated.
46
Define GUIDE PLANES (RPD)
Guide planes are two or more parallel (axial) tooth surfaces on abutment teeth which are used to restrict the path of insertion of a partial cobalt chrome denture.
47
Define NATURAL GUIDE PLANE (RPD)
A natural guide plane is one that already exists on a proximal tooth surface or a restoration.
48
Define ARTIFICIAL GUIDE PLANE (RPD)
An artificial guide plane is one that the dentist prepares on a proximal tooth surface using a bur, or one that is incorporated into an indirect restoration (usually a crown). (Original curved contours of tooth modified to flat surfaces using parallel-sided diamond bur + fast handpiece)
49
What type of denture are guide planes used for? (RPD)
They are only used for cobalt chrome partial dentures (not acrylic dentures). All guide planes should be drawn on a partial cobalt chrome denture design.
50
Sometimes it is not possible to have a guideplane… what is the consequence of this? RPD
Sometimes it is not possible to have guide planes, and this just means that **the path of insertion is less controlled.**
51
Advantages of guide planes for Co-cr partial dentures?(6) RPD
Control path of insertion of a denture **Facilitate easy insertion + removal of dentures** (denture has a particular direction it moves in) **Contribute to overall retention of the denture** (undercuts more predictable/precise) **Minimise wedging stresses on abutment teeth** (forces that act laterally on natural teeth) Reduce amount of ‘blockout’ or ‘deadspace’ (space between denture + natural teeth where there are tooth undercuts) **Aid denture stability** (prevents movement during function because clasps more efficient)
52
State two reasons why tooth support is important? (2);CoCr RPD
to spread occlusal forces onto natural teeth (minimises trauma to soft tissues under the denture) Rests on teeth are designed to direct the occlusal load down the long axis of the natural tooth (rather than from the side which might tip the tooth) (Co-Cr)
53
State two functions of occlusal rests? RPD
Provide tooth support to spread occlusal forces onto natural teeth (which minimises trauma to soft tissues under the denture) Rests on teeth are designed to direct the occlusal load down the long axis of the natural tooth (rather than from the side which might tip the tooth)
54
Tooth preps for partial denture? -type of denture (1) and 2 types of tooth prep (2) ;RPD/Co-cr
These are for cobalt chrome partial dentures only!!! … and include 1. guide planes 2. rest seats
55
What are 3 types of rest seats? RPD; Co-cr
Occlusal Cingulum Incisal
56
Rationale for rest seat preparation? (2) RPD; Co-Cr
To **provide space between the occlusal surfaces of upper and lower teeth** to allow a rest of adequate thickness to be used To provide **more suitably inclined bearing surfaces than those existing on unprepared teeth ** (ie. greater horizontal inclination)
57
State the 4 classes of the Kennedy Classification? RPD Co-Cr
1. Class I (bilateral free ended partially edentulous) 2. Class II (unilateral free ended partially edentulous) 3. Class III (unilateral bounded partially edentulous) 4. Class IV (bilateral bounded anterior partially edentulous)
58
State the component parts of a partial denture? RPD; Co-Cr (9)
1 Saddle 2 Denture teeth (saddle) 3 Guide plane 4 Rest seat – support 5 Retention 6 Reciprocation 7 Connector 8 Acrylic 9 (Any abutment teeth)
59
Define an occlusally approaching clasp? (Co-cr)
**Occlusally approaching**. This is when retentive arm approaches the tooth undercut from the occlusal direction. **The terminal third of the clasp arm is below the survey line.** But sometime more conspicuous. (most clasps approaching from occlusal and then undercut)
60
What are the 4 type of occlusal clasps?(4) ;Co-cr
1 Occlusally approaching clasp 2 Reverse C clasp 3 Ring Clasp 4 Double arm clasp
61
Define Gingivally Approaching Clasp? (;RPD, Co-Cr)
Gingivally approaching clasp = the **retentive clasp arm** approaches the tooth undercut from the gingival direction. Such clasps produce a **trip action when being forced out of the undercut**. This action = MOST *effective ways of retaining the denture*
62
State the 4 different types of gingivally approaching clasps? (4)
Y clasp T clasp Half T Ball ended
63
State the different types of upper major connectors? (5) ;CoCr
Palatal strap Palatal plate Palatal horseshoe Anteroposterior bar Combination of chrome + acrylic
64
List the 6 different types of lower major connectors?(6) ;Co-Cr
Lingual bar Sublingual bar Dental bar Buccal/labial bar Lingual plate Split lingual plate
65
Benefits of Co-Cr partial dentures? (6)
Stronger Less bulky Hygienic design possible with less coverage of soft tissues Provides tooth support (so less trauma to soft tissues Easier to keep cleaner (less easy to modify than acrylic though)
66
List 7 advantages of CoCr partials compared to acrylic partials? (7)
Tooth support possible so less trauma to soft tissues likely Clasps tend to be more effective if guide planes used (and if designed correctly) Better support + direct retention makes the denture more stable (moves around less during function) Less bulky so better tolerated by patient Hygienic designs possible so less gingival coverage (protects periodontal health) Less plaque retention around teeth (lower caries risk) Metal stronger so major connector can be thinner + tolerated better
67
What are the steps for making an immediate ACRYLIC denture (partial) to replace extracted teeth? (3)
1. Start making a partial acrylic denture around the teeth to be extracted 2. Then add extra teeth to the denture before being finished 3. Extract teeth and fit immediate denture at the same visit
68
Purpose of secondary/ master impressions?(2)
Facilitate more accurate impressions for making dentures Special tray helps impression accuracy (because it covers all the areas needed and the impression material is fairly even in thickness + not too thick which reduces distortion).
69
Key facts about Co-Cr framework try-in stage? (2) RPD
(Make and fit cobalt chrome framework) Need to do this before adding denture teeth Usually, fit framework first + then add wax rims to do jaw registration rather than make separate rims
70
What to do at tooth try-in in pink wax? (2) ;try-in
**Choose shape and shade of denture teeth** at the previous visit. Use previous dentures/photos as a guide. **Check all aspects of dentures are correct shape/position and make changes as necessary before next stage**
71
What can go wrong during denture flasking?(7) ;flask pack and finish stage
1) **Contraction porosity** - not enough dough in flask/ or flask not closed properly leaving spaces 2)**Gaseous porosity** - flask heated up too quickly in early stages of denture processing. Monomer turns to gas making bubbles 3) **Granular porosity** – dough mixture too dry initially/ or is left uncovered before packing into flask (monomer evaporates) 4) **Uncured chemicals** – usually uncured monomer which can be irritant/toxic (unsafe so must remake denture) 5) **Structure may be weaker if not cured properly**, or there are cracks or porosity (remake denture) 6) **Appearance may change** – decide with patient if unsatisfactory/ or needs remake or a modification 7) **Acrylic can distort** + denture may not fit well (even after adjusting).
72
What 3 things do you check at denture fit? (4) ; denture fit
Check fit surface(s) + adjust (pressure indicating paste, if needed) Adjust high spots with acrylic bur where paste is displaced (0.5mm depth at a time and blend in edges). Then recheck with paste and trim again if needed. (Beware undercuts inside saddle flanges that may cause a problem with insertion) Check and adjust occlusal surface(s) with articulating paper + acrylic bur Give denture instructions (ulcers, cleaning, review appts)
73
What instructions would you give to pt after fitting the denture? (wearing the denture) (3) ;denture fit
Only wear during the day (not at night) to avoid denture stomatitis. Don’t wear during the day if painful/cause ulcers So,just wear on the day of review appointment to avoid unnecessary pain and remind patient of sore area(s)
74
What instructions would you give to pt after fitting the denture? (CLEANING the denture) (3) ;denture fit
**Scrub all surfaces gently** (so does not scratch) using **soft denture brush and warm soapy water** (no harmful chemicals) **Clean over a sink/bowl of water to avoid denture fracture** if dropped on hard surface Clean twice a day and when leaving out at night (e.g. after food to remove debris that might lead to denture plaque).
75
List 7 mouth care for instructions for denture wearers? (7)
Brush natural teeth properly, morning + before bedtime Make sure can remove dentures easily Brush dentures twice daily with soft brush + soap/denture paste Brush dentures over a sink of water in case drop it Don’t wear dentures at night to keep tissues healthy If they experience any soreness/pain associated with the denture, leave denture out and make an appointment to see the dentist to check it **Advise annual check-ups for dentures as well as natural teeth**
76
When do you do a denture review? (state both appointments)(2) ;denture review
Review patient after short time (1-2weeks if poss) + then again as necessary. We often recommend a final review after a few months just to check all is fine before discharging patient
77
How would you adjust denture acrylic at fit/review visits? (4)
**Use pressure paste/spray on denture fit surfaces** (especially buccally near the tuberosities) Seat denture and apply **even pressure** both sides occlusally **Remove approx. 1⁄2 mm thickness of acrylic in the pink acrylic areas **(showing through the paste) and** blend this in with the rest of the fit surface if possible.** (This relieves high spots on the denture fit surface so that the rest of the fit surface adapts to the underlying tissues better, thus improving retention). **Do the same for the denture borders if they are too long** (overextended). This should prevent trauma to the sulcus tissues.
78
If the pt has no complaints w/ their denture during the fit/review – what 3 things do you still check? ;denture review/problems
****Check the** occlusion** again in case needs further adjustment (articulating paper GHM) Remove the denture(s) and check the **health** of the soft tissues underneath **Check oral and denture hygiene**
79
State 5 things that influence how well the pt might adapt to the denture? (even if no issues w/ the denture) (5) ;denture problems
Previous denture experience (poor) Degree of change (in shape) between old and new Quality of dentures Patient factors (age, oral and general health) Patient expectations (patient complaint)
80
State 3 reasons why there might be pain under dentures? (3) ;denture problems
**Denture fit surface is the wrong shape** (such as impression fault, casting fault, denture processing error at the end) **Denture fit surface is the correct shape, but the tissues underneath are more sensitive** (such as compression of mental nerve, or buried root just under mucosa, or irregular bone surface causing pain or when mucosa squashed against it under a denture) **The occlusal load transmitted through a denture is more than the mucosa can tolerate** (occlusal high spot on a denture, or denture OVD too high, or denture support lacking)
81
How do you detect sensitive tissues under dentures? () ;denture problems
Dry mucosa Palpate soft tissues Apply pressure paste on tissue Place denture in the mouth Trim the denture where the paste is
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How to detect excessive OCCLUSAL LOAD transmitted through denture onto mucosa causing pain? (4) ;denture problems
**Examine site of pain to exclude non-denture related pathology** (typical presentation of denture trauma is redness/soreness/ulcer on mucosa). **Examine natural occlusion without dentures to establish how the patient should occlude when the dentures are in the mouth** (use articulating paper or shimstock. **Put upper denture in mouth and use articulating paper or shimstock to examine if denture teeth high**. Use a**rticulating paper to identify where the high spots are on the denture teeth.** Then remove them with an acrylic bur until the natural teeth come back into contact (adjust high tooth spot first and see if this resolves if it does not then do prophy paste step and adjust the fit surface as you would otherwise)
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List 5 reasons dentures can be loose? (5) ;denture problems
1) **Lack of clasps on teeth (or they do not work properly).** 2) **Denture fit surface incorrect shape so denture wobbles.** 3) **Uneven occlusal contact** on dentures can cause them to tip or move during function. 4) **Polished surface(s) too bulky and facial muscles or tongue displaces denture** 5) In complete dentures, **a lack of suction effect (known as ‘peripheral seal’) can cause looseness.** This is often because the denture border is not well adapted in the sulcus areas or there is no effective post dam at the back of an upper complete denture.
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What happens when polished surface are the wrong shape? (1) ;denture problems
Soft tissues displace the denture (lingual undercuts + the tongue pushes off the denture during function)
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Define Impression surface?
derived from the impression and in contact with the alveolus as far as the mucosal reflection
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Define Occlusal surface?
that part of the denture in contact the opposing teeth either natural or artificial
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Define Polished surface?
surface of the denture which contacts the tongue, lips and cheeks and includes labial, buccal and lingual surfaces of the teeth
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Define ‘neutral zone’
where inward pressure from the cheeks would be balanced by outward pressure from the tongue
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Define ‘denture space’ ?
to describe the space limited by the tongue, lips and cheeks + residual alveolar ridges
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What is the likely cause of pain on lateral excursion? (1) ;denture problems
The coronoid process is against the side of the denture (need to trim denture to adjust)
91
What can cheek biting be a result of ? (1) ;denture problems
No buccal overjet (need to create buccal overjet to prevent cheek biting)
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What are possible reasons for pt gagging with denture in? (4) ;denture problems
Upper denture extends too far back (onto soft palate) Upper denture loose Excessive OVD Lack of tongue space
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Factors to consider for a broken denture? (5) ; denture problems
**What is the cause** (is it uneven occlusion + flexing of denture, or thin acrylic, or was the denture dopped)? **Is there a previous repair?** Do the **pieces fit together properly out of the mouth**, or do you need something to temporarily hold the pieces together before sending to the lab for a repair? **Do you need an opposing cast?** Take an alginate impression. **Is recurrence likely?** If yes, then consider a new denture.
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List 6 causes of mid-line fractures? (6) more common in upper denture ;denture problems (part 1)
Open flanged denture Deep frenal notch Midline diastema Alveolar resorption under denture (denture flexes in midline) Unfavourable occlusal forces (tooth wear) Thin acrylic (increases fracture chances)
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List 6 other possible of mid-line fractures? (6) part 2
1. Previous repairs 2. Denture inclusions (“strengtheners”) 3. Permanent soft lining in lower (reduces thickness of hard acrylic) 4. Midline palatal torus in upper (should be relieved on master cast) 5. Occlusal habits (bruxism and clenching) 6. Thinning of denture base in upper (abrasive cleaning)
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How to repair Acrylic Fractures?
Two possible situations, either: 1. Clean fracture (where pieces locate out of mouth). If so fix together with sticky wax and pour plaster cast and repair with cold-cure in lab 2. or, complex (need alginate ‘pick up’ impression of all or some pieces in situ so can relocate them). Can be extremely difficult ! (Remake likely instead). NB. Do you need an opposing model? and occlusal record?
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How do you prevent fractures? (4)
* Adequate thickness of hard acrylic (especially when using permanent soft lining) * Strengtheners - selenese fibres or stainless steel mesh embedded in acrylic.Retain parts mechanically (some bond to acrylic which may improve strength). * Use high impact acrylic (‘flexes’) * Incorporate cobalt chrome denture base (where possible/ indicated)
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What to do when denture teeth debond or break? (3)
**WHY debonds?** Denture tooth debonds if thin film of wax has been left on teeth during ‘boiling out’ * **If patient has the tooth** – needs lab repair with cold-cure resin (short-term emergency repair for an anterior tooth – can use ‘superglue’) * If the tooth is **missing** you may need an impression of the opposing arch (send to lab for addition of new tooth)
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What is the difference between reline + rebase? (2) ;denture problems
Reline - modifies the denture fit surface only (new acrylic resin) Purpose: to resurface the tissue side of a denture to make it fit more accurately Rebase - modifies the polished surface too Purpose: a method of refitting a denture in which the base material is more or less completely replaced
100
Indications for reline/rebase? (6)
1. Where the fit surface “doesn’t fit” (painful, loose denture) 2. Bone resorption (recent extractions or jaw surgery) 3. ‘Quick fix’ alternative to new dentures 4. Fractures (thicker baseplate) 5. Want to add flanges 6. Want to add soft linings (permanent)
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What are the 4 choices of reline material? (4)
1. Permanent or temporary (durability) 2. Heat cured or cold cured (distortion) 3. Chairside reline or laboratory reline (time available) 4. Soft or hard materials (condition of underlying tissues)
102
State the pros + cons of using TEMPORARY, HARD reline material? (chairside)
* Colacryl (powder and liquid) * Poor colour match * Fairly durable (not ideal long-term) * Quick and easy to use * Use similar to ‘impression material’ * Use ‘closed mouth technique’ BEWARE GETTING STUCK IN HARD TISSUE UNDERCUTS (e.g. natural teeth)
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State the pros + cons of using TEMPORARY, SOFT reline material? (chairside)
* Viscogel (powder and liquid) * Poor colour match * Lasts few weeks (can replace) * Cushions mucosa (allows recovery) * Quick and easy to use * Use similar to ‘impression material’ * Use ‘closed mouth technique’
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State the pros + cons of using PERMANENT, SOFT reline material? (chairside)
* EverSoft (powder and liquid) * Reasonable colour match * Lasts months or years * Cushions mucosa (reduces pain) * Quick and easy to use * Use similar to ‘impression material’ * Use ‘closed mouth technique
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State the pros + cons of using PERMANENT, HARD reline material? (laboratory)
* Heat cured acrylic * Excellent colour match * Permanent * Need chair-side impression * Thin layer blue extrude * Remove undercuts beforehand * Use ‘closed mouth technique’
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State the pros + cons of using PERMANENT, SOFT reline material? (laboratory)
* Heat cured, flexible (‘Molloplast B’) * 3mm thickness needed * Lower dentures (not uppers) * Reasonable colour & permanent * Cushions mucosa (reduces pain) * Thin layer blue extrude * Remove undercuts beforehand * Use ‘closed mouth technique’
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What is the impression technique for relines? (2)
Remove undercuts Use light-bodied, flexible impression material (not Zinc Oxide paste)
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What are 3 problems with relining or rebasing? (3)
**Increase in OVD** (use thin layer of impression material) **Occlusal errors** (can use “closed mouth technique” but beware excess material) **Damage during laboratory processing** (warn patient might not be able to wear denture)
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List 5 steps for adding a tooth to a denture for a planned extraction (immediate addition)? (5) PROCESS
Choose correct size of tray Add wax where tooth is being added to record full depth of sulcus Take over impression Take lower impression if occlusion important Write labcard
110
Managing a pt w/ poor prognosis teeth (using dentures) What do you need to consider? (8)
1. Patients’ wishes. 2. Patients’ previous experience wearing dentures. 3. Medical history. 4. Life expectancy of teeth, active disease and/or pain. 5. Patient’s ability to maintain optimal oral health. 6. The position of the poor prognosis teeth. 7. Patient attendance/number of visits available. 8. The long-term treatment plan for the patient.
111
Managing a pt w/ poor prognosis teeth (using dentures) 1. Pt's wishes State key considerations:
- if a tooth is XLA'd, does pt want a denture to replace it? (might prefer a fixed option) - if pt = successfully wearing a denture currently, more likely to accept FURTHER TOOTH REPLACEMENT w/ denture. - An XLA'd anterior tooth (esp. upper) usually needs replacing for pt's appearance + wellbeing. - an XLA'd posterior tooth may NOT need replacement of space = not visible. - An XLA'd posterior tooth may not need replacing if it has nothing to OCCLUDE w/ in the apposing arch.
112
Managing a pt w/ poor prognosis teeth (using dentures) 2. Pt's previous experience wearing dentures State key considerations:
Is pt wearing a denture that can be added to? Acrylic much easier to add to than Co-Cr If no existing denture, has pt worn a denture before? How successful was it? Can they describe it? Adding denture teeth to an existing denture helps pt adapt to a new denture + loss of own teeth A new denture can be made later once all teeth XLA'd + tissues have healed A "transitional denture" is usually a partial denture w/ teeth added until it becomes a complete denture.
113
Managing a pt w/ poor prognosis teeth (using dentures) 3. Pt's MH State key considerations:
Poor healing response or resistance to infection may influence tx (endo vs XLA) Precautions needed for XLAs may influence timing If surgery poses risks to health, is it better to XLA multiple teeth at once to reduce surgical episodes? No.of teeth XLA'd at same visit sometimes depends on their location (e.g. R + L side separate visits if LA used) Poor general health or mobility may make travel or time spent in chair difficult. Shorter and/or fewer appointments better? The availability of the pt's chaperone, or interpreter, may affect timing + duration of appointments.
114
Managing a pt w/ poor prognosis teeth (using dentures) 4. Life expectancy of teeth, active disease + any pain State key considerations:
Try to **PRESERVE** natural teeth if they will improve the ability to wear a denture **BALANCE** this w/ the need to manage active disease + any pain Consider **POSTPONING** decision to XLA teeth until tried to STABILISE disease. How extensive is CARIES? Is ENDO tx possible? Has PERIO tx reduced tooth mobility? If a **natural tooth crown = UNRESTORABLE**, the root can be saved as an **over-denture abutment**. Root preserves ridge height which helps denture stability + support Over-denture abutments should always be above **gingival level**, cleansable + well maintained by the pt (can decay easily)
115
Managing a pt w/ poor prognosis teeth (using dentures) 5. Pt's ability to maintain optimal oral health State key considerations:
Dentures cover periodontal tissues + teeth can make disease more likely Always stabilise perio disease + improve OH before denture Pt should understand the risks + why good OH = important Plaque score 20% or less before starting dentures Marginal bleeding 10% or less Dentures need cleaning too! (Recommend appropriate methods) If a denture is made before the perio is stabilised, pt may not comply w/ perio tx. More teeth may be lost in future.
116
Managing a pt w/ poor prognosis teeth (using dentures) 6. The position of poor prognosis teeth State key considerations:
OVER-ERUPTED, TILTED or DRIFTED natural teeth can disrupt the OCCLUSAL PLAN. Fitting denture teeth around poorly positioned natural teeth can be tricky. May have space for denture base only. Upper complete rely on suction to stay in place or 'peripheral seal' Keeping even 1 natural tooth means NO seal possible. i.e. INDIRECT RETENTION Retaining 1 upper natural tooth each side can facilitate DIRECT RETENTION (one clasp each side = better than one side only) In lower denture, gravity helps denture stay in place. Peripheral seal less effective. Retaining lower natural teeth helps denture stability (either by clasping or preventing sliding sideways)
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Managing a pt w/ poor prognosis teeth (using dentures) 7. Pt attendance/ no.of visits available State key considerations:
Pt needs to know how many visits needed to agree to tx. (refer to checklist of stages + include other tx) Planning tx include ST management, perio, direct + indirect restorations, XLAs (+ any healing) Then all the denture stages (6 visits including all stages)
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Managing a pt w/ poor prognosis teeth (using dentures) 8. The long-term tx plan for the pt State key considerations:
is the pt having more teeth out later (acrylic denture can be added to more easily) Is the denture being worn to allow healing before a bridge is made? **Co-Cr dentures can be added to if metal extends to area.** Co-Cr dentures more expensive + time consuming to make. Make these when dental health stable so they last longer. Is a temporary acrylic partial denture being made first + then a definitive Co-Cr partial later? **WEAR CASES**need proper planning (e.g. plan any increase in OVD)
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What are the steps for an IMMEDIATE ACRYLIC DENTURE to replace previously XLA'd teeth + the teeth to be XLA'd?
1. Start making a new partial acrylic denture around the teeth to be extracted (use acrylic not cobalt chrome) 2. Then add extra teeth to the denture before being finished 3. Extract teeth and fit immediate denture at the same visit
120
Steps for Immediate acrylic denture to replace two anterior teeth?
1. Upper & lower alginate impressions + shade + jaw reg (interocclusal record). 2. Show wax tooth try-in to patient. 3. Extract teeth and fit immediate denture at the same visit.