REM PROS REVISION LEC CARDS Flashcards
Why make the mouth healthy before starting dentures? (3)
- Dentures more comfortable if tissues healthy
- Dentures last longer (other treatment may
change the fit of a denture, eg. extractions) - Dentures can make dental disease worse
What oral structures are we making healthier (pre-denture)? (3)
Oral mucosa
Teeth
Periodontal tissues
What is denture stomatitis? List KEY facts to do w/ denture hygiene? (6) (Pre-tx; oral mucosa)
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)
ORAL ULCERS - non-denture + denture related? (2) (Pre-tx; oral mucosa)
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)
What is BRONJ? + how do we manage? (Pre-tx; oral mucosa)
Bisphosphonate related osteonecrosis of the jaw
Management = Referral
How do identify/manage denture if causing trauma / trauma rx ulcers? (3) (Pre-tx; oral mucosa)
- Assess if denture border too long for sulcus
- Identify area causing trauma w/ pressure paste + trim back w/ acrylic bur
- Temporary soft lining may help
How do you use pressure paste to identify area of trauma? (2) (Pre-tx; oral mucosa)
Apply pressure paste to edge of denture
Trim pink acrylic showing through w/ paste still there
How do you use soft linings to ease area of trauma? (3) (Pre-tx; oral mucosa)
Mix + apply to fit surface
Place in mouth to mould to shape
Trim excess (lasts weeks/months + allows tissues to recover)
What is denture granuloma? Management? (4) (Pre-tx; oral mucosa)
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)
Why manage caries + perio disease before starting dentures?(2) ; state tx (3) (Pre-tx; oral mucosa)
- Dentures attract plaque (any plaque rx diseases made worse)
- 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)
Key considerations re tooth-wear before making dentures? (3) (Pre-tx; oral mucosa)
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)
Reasons for using articulated casts? (6) (;Articulated cast)
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
What material is used for primary impressions + why is a good primary impression important?
Alginate
An accurate primary impression means your special tray is a better shape + needs less modification to the borders
How/tips on selecting stock tray? (5)
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
How to get accurate reading of sulcus area?(8) -primary + secondary imps
1.Check tray extends to full height of the sulcus (2mm gap between tray + sulcus)
- Add double layer of wax to extend borders if tray too short in sulcus area
- Ensure frenal attachments not squashed (cut grooves in wax if too long)
- Pre-load some sulcus areas with alginate to avoid trapping air (esp labially)
- Ensure sufficient impression material where you need it (enough in the stock tray?)
- Seat tray correctly so that impression material can flow over tray borders correctly
- Border moulding (by pt +/ operator) whilst impression material setting
- Ensure detachable handle does not interfere with lip movement (is it fitted correctly?)
How do you manage gagging pt during impressions? (4)
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)
List 4 instructions for correct disinfection + storage of impressions (Alginate or silicone) (2)
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
11 Possible sources of error on final cast?
1.Using the wrong type of impression material
- Not using a material according to instructions
- The impression tray you are using is flexible
- Not rinsing off disinfectant before leaving clinic
- Not storing impression properly after it’s been taken
- Impression material distorts whilst casting
- Not using the correct type of stone
- Air bubbles trapped whilst casting impression
- Excess liquid inside the impression when casting
- Disturbing the model before stone set properly
- Damaging the cast during use
What shape should an impression border be?
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)
What is the post-dam area?
= 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)
What is a functional impression?
existing denture version
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)
List 6 ways to reduce errors when casting? (8)
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)
What is meant by jaw relation? (2) (;jaw reg stage)
3D spatial relationship between the upper + lower jaws (or teeth)
Both a VERTICAL + HORIZONTAL component
What is meant by horizontal jaw relationship? (3) State rationale (1) (;jaw reg stage)
- 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