CA1 TYS Learning Pts Flashcards by Yu Ning Teoh

(T/F) Roaches require less coronal modification than suprabulge clasps

T
- suprabulge clasp = c-clasp

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(T/F) Suprabulge clasps will not impinge on vestibular tissues

T, shd only be on tooth

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(T/F) Direct clasps must engage at least terminal 1/3 of undercut to be ideal

F (why tho)

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(T/F) Mesial rest of the RPI system mitigates stress on the abutment tooth better than proximal rest

RPI System = Occlusal Rest, Distal Guide Plane, Gingivally approaching I bar
- basically udw the rest to be on the distal side then the tooth tilts distally & happens easily also cuz theres no adjacent tooth

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(T/F) Mucosal borne dentures are usually made from Co/Cr.

F. (Made out of acrylic?)

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(T/F) The fulcrum line passes through the two most posterior rests on the abutment teeth.

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(T/F) Indirect retainers ought to be located at the posterior teeth for greater support

F (go read up on what indirect retainers are)

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Which Kennedy classes require RPI?

KC II & III (why?)

RPI : rest(mesial), proximal plate(distal), i-bar(buccal)

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Which of the following is not a type of rest?
1. Occlusal
2. Proximal
3. Cingulum
4. Overlays

Ans: Proximal

go study more on overlay denture rests, what r they?

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What is not a criteria for selection of maxillary major connectors?

Presence of palatal tori
The need to stabilise weak teeth
Depth of palate
Location of edentulous areas

Ans: depth of palate is not a criteria of selection

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A KC IV px is indicated for mandibular partial denture. He has extensive gingival recession and lingual tori is present. Which would be the major connector most suitable for this patients denture?

Lingual plate

used when there is insufficient lingual depth for bar
acts as indirect retainer, limiting denture rotation

Other answers not selected in the mcq: sublingual bar, lingual bar, labial bar

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(T/F) Tooth replacement is always necessary in order for the patient to eat properly

F. A minimum of 10 pairs of teeth required for proper function, replacement not always needed.

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(T/F) Having an RPD to replace loss of teeth helps in the transition to a complete denture.

T
- prolly due to training of neuromusculature

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(T/F) Aesthetics of patient is a clinical factor that may affect the design and prognosis of the RPD

F
- it is a factor that will affect the design but it is not a clinical factor

other clinical factors: px’s age, oral hygiene, general health of patient, chemotherapy

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The working/master cast is used for..

Fabrication of prosthesis
- master cast has to be accurate and reproduce all the fine details from the impression for the fabrication of prosthesis

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List the purposes of surveying:

Identify undercuts to be blocked out
Locate existing/probable guide planes on abutment teeth
Identify suitable path of insertion/withdrawal of denture
Identify undercuts on teeth to aid retention of denture

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(T/F) Full guide planes should be used on abutment teeth as it ensures the best possible path of insertion and withdrawal.

False
- full guide planes will put too much force on the abutment tooth
-
Guide planes:
- increase stability of denture and resistance to lateral movement
- direct the path of placement and removal of removable partial dentures.

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(T/F) Guide planes can provide oblique or vertical path of insertion/removal

True

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(T/F) Rests only help in dissipating vertical forces but not horizontal forces.

False
- rests help dissipate both vertical and horizontal forces

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(T/F) Indirect retainers can take the form of rests.

True

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(T/F) Rests can take the form of an overlay.

True

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(T/F) Rests function to load transmission of forces through the longitudinal axis of the tooth.

True

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Which component of RPD prevents displacement of denture bases by functioning through lever action on the opposite of the fulcrum line?

Indirect retainers
- assists in direct retainers doing so

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(T/F) Should always use a full flange to provide as much support as possible

False
- over extension of flange may result in ulceration of soft tissues

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(T/F) When choosing major connector to use, do not cover mucosa unnecessarily

True - covering mucosa unnecessarily results in even more plaque retention

(T/F) Indirect retention is always needed

False - indirect retention is only needed for **free end** saddles and **long anterior** saddles

(T/F) Use as many minor connectors as possible to stabilise the denture.

False

(T/F) Tilting the head backwards increases the Rest Vertical Dimension (RVD)

True - gravity causes jaw to open slightly/lower slightly -

(T/F) MMR should be recorded at a selected RVD with the mandible in the most retruded position

False - MMR is recorded at OVD and not RVD

(T/F) MMR is recorded to determine the horizontal position of the upper and lower false teeth

True

(T/F) MMR is recorded to determine the midline/centre line around which the teeth are to be arranged

True

Which of the following is not a mechanism of RPD retention? 1. Muscular control 2. Chemical retention 3. Physical forces 4. Mechanical retention

Chemical retention

(T/F) Extent of guide plane on abutment tooth determines the magnitude of clasp retention

False - guide planes are direct retainers that provide frictional resistance - not part of the clasp

Which teeth are the best for tooth support?

1. Canines 2. 1st & 2nd molars - due to bulbous and long roots, most effective for axial loading

Which is not an indication for using the Lingual plate as a mandibular major connector? 1. Extensive gingival recession 2. Presence of inoperable lingual tori 3. Support of periodontally weakened teeth 4. Severe anterior crowding

Ans: Severe anterior crowding (contraindication for lingual plate) - gingival recession has the same effect as high floor of mouth, thus, lingual plate can be used - support of periodontally weakened teeth or mandibular teeth which may need replacement in the future are indications of lingual plate

Loss of ________ _______________ results in proximity of chin to nose.

Vertical dimension

A removable partial denture is a removable prosthesis that replaces one/more but not all of the _________ and __________.

Natural teeth and supporting structures

Debilitating health conditions may reduce oral tissue _______ to extra ________ ____________.

Oral tissue tolerance to extra occlusal loading

Loss of front teeth can cause the _______ to collapse while the loss of back teeth can cause _________ to collapse, resulting ________________________________.

Loss of: Front teeth results in lip collapse Back teeth results in cheek collapse Loss of vertical dimension

The 2 main types of RPD are ________ & _________.

Cobalt-chromium & acrylic

(T/F) speech impairment is not a consequence of loss of posterior teeth

True - is a result of loss of anterior teeth

(T/F) Tooth loss can further increase risk of periodontal disease

True

(T/F) master impression is done before primary impression

False - primary impression is done first for primary cast for diagnosis - thru diagnosis, treatment plan is made - then u start w final impression for master cast

(T/F) RPD treatment can start w the patient having predisposed oral conditions

False - any untreated dental problems should be properly treated prior to RPD treatment

All the following are disadvantages of RPDs, except: 1. Enhanced plaque retention 2. Loads on remaining tissues 3. Components are potentially visible (during speech/smiling) 4. Occlusal forces will not be well distributed

4. - occlusal forces will be better distributed w RPD

(T/F) palatal bar is less rigid than a palatal strap

True

(T/F) reciprocators usually engage undercuts

False

Maximum enamel removal is ____mm

0.5mm

(T/F) height of guide plane ranges from 2-4mm

True

(T/F) cingulum rest should be placed at the most bulbous area of the cingulum

False - should be placed at the flattest area of the the cingulum

(T/F) floor of occlusal rest is spoon shaped

True

The outline of occlusal rest should be ______________ shape

Rounded triangular shape

(T/F) floor of an occlusal rest seat should be flat to ensure even distrubution of force

false - angle formed by rest and minor connector is <90 - to direct occlusal load along the long/vertical axis of abutment tooth

(T/F) enamel modification for cingulum rests should span from one marginal ridge to another

True

(T/F) rests can be placed on any direct restoration

false

The angle formed by rest and minor connector should be _____ than 90 degrees, so that occlusal load can be directed along the ____ axis of an abutment tooth

Less, long

(T/F) preferred tooth to place cingulum rest is on the canines

True

(T/F) clasp should have a lower modulus of elasticity than connector

True - needs lower modulus of elasticity so that it is flexible enough to engage moderately deep undercuts - higher modulus of elasticity=> more rigid - connectors need higher modulus of elasticity

(T/F) Chromium is responsible for corrosion resistance in CoCr alloys

True

Purpose of burning out after investment of refractory cast is..

1. Drive off moisture in mould 2. Vapourize and eliminate wax pattern 3. Expands mould to compensate for contraction of metal during cooling

(T/F) wax used to block undercuts should have a melting temperature that is higher than 130 degrees

True - e.g. kerr’s sprue wax

Master cast for CoCr dentures should be poured in silky rock as..

Silky rock(type IV) is harder than dental stone(type III)

(T/F) master cast should be poured in silky rock

True

Master cast should be duplicated in..

Reversible hydrocolloid

(T/F) refractory casts are not resistant to heat

False - they need to be resistant to heat to withstand casting temperatures

(T/F) refractory casts expand to compensate for shrinkage which occurs when metals cool

True

(T/F) refractory casts are made of silica material

True - either made of silica or phosphate bonded material

(T/F) refractory casts are made of phosphate bonded material

True - either of silica or phosphate bonded material

(T/F) CoCr can be soaked in polident, which contains chlorine, as it has antibacterial properties

False - chromium containing alloys will get attacked by the chlorine!

List out some properties of CoCr alloys

1. Resistant to corrosion 2. High strength 3. Rigid 4. Low cost 5. High melting point

Which of the following is not a common metal material used in design of denture bases? 1. Cobalt chromium 2. Cobalt-nickel-chromium 3. Nickel chromium 4. Gold 5. Silver

ans: silver

(T/F) connectors used in RPD set ups have a high modulus of elasticity and high proportional limit

True

(T/F) one of the functions of burn out is to evaporate water off of the wax pattern so that further changes can be made to it

False 3 purposes 1. Drive off moisture from mould 2. Eliminate wax pattern 3. Expand mould to compensate for contraction of metal on cooling

(T/F) when removing the refractory cast from the hydrocolloid, refractory cast should not be pulled away from the mould as the surface is soft and abrades easily

True - cuz the surface of the cast? Is soft and abrades easily

(T/F) bars are less rigid than straps

True

(T/F) straps are able to provide support/bracing function

True

(T/F) bars are useful for short-span bilateral tooth-borne RPDs

True

(T/F) bars are able to provide support/bracing function

False - bars are unable to provide support

(T/F) survey lines are parallel lines on abutment teeth used for determining path of insertion

False

(T/F) to improve retention, buccal and lingual clasp arms both need to engage undercut

False

(T/F) to avoid food particle abrasion, major and minor connector must be designed to cover gingiva

False

(T/F) indirect retention is impt for KC1 cases

True

(T/F) embrasure and circumferential clasps are gingivally approaching retainers

False - occlusal approaching

(T/F) roach and I bar are occlusally approching retainers

False - gingivally approaching

(T/F) clasp assembly consists of the clasp, reciprocator, rest and major connector

False Components of a clasp assembly 1. Rest 2. Retentive clasp arm 3. Reciprocal clasp arm 4. Minor connector 5. Proximal plate

(T/F) in an RPI system, the I bar should always sit on the distobuccal surface

False RPI system: rest, proximal plate, I bar - shd come frm mesial rest to reduce stress on abutment tooth during masticatory loading - so that tooth doesnt tilt

(T/F) one of the main requirements of a major connector is rigidity

True

(T/F) reciprocators and clasps shd engage more than 120 degrees of the tooth

True

(T/F) in the RPI system, the I stands for I bar which will approach the abutment tooth distobucally

True

(T/F) the minimum sulcus depth for roach is 4mm

True

(T/F) a purpose of surveying is to ensure path of displacement is parallel to path of withdrawal

false - u want paths to be different so that denture wont easily dislodge

(T/F) a purpose of surveying is to identify the guide plane for retention

True

A patient presents to you with only #34,35,43,44, what is his KC

Class 1 mod 1

(T/F) a use of FWS is to estimate OVD for edentulous patients

True

What is the definition of support

Resistance of denture to displacement by functional stress. Supporting structure of the mouth are tissues which provide resistance to masticatory load transmitted by the denture.

List out the denture components that help with support

1. Rests 2. Denture base and flanges 3. Major connectors 4. Clasps above survey line (esp ring clasps)

Name 3 enamel modifications that need to be made before master impression

1. Occlusal rests 2. Cingulum rests 3. Guide planes 4. Rest seats for embrasure clasps

Name 3 ways of obtaining retention

1. **Mechanical means** - direct & indirect retainers 2. **Patient’s muscular control** 3. **Physical forces** - surface force (**adhesion** of saliva to denture & mucosa) - fluid force (surface tension, **cohesive** forces) - atmospheric pressure

List 2 functions of rests

- support - bracing - reciprocation

List 2 functions of c-clasps

- retention - support - bracing

List 2 functions of guide planes

- limit path of placement and removal - some retention - stabilisation against horizontal forces

List 2 functions of major connectors

- **unify the components** in an RPD - to **distribute the occlusal loads** from saddle to all abutment teeth and supporting soft tissue throughout the arch - to limit the potential denture movements and improve denture stability (**support and bracing**)

List 3 factors that affect the choice of mandibular connector?

- depth of alveolar ridge/lingual depth - presence of lingual tori - lingual inclination of remaining teeth - horizontal stability (bracing) & stress distribution (support) - need to stabilise weak teeth - anticipated loss of natural teeth - patients preference

(T/F) indirect retention is impt for KCII

True - indirect retention is impt for KCI, II and for long span class IV cases - only not impt in KCIII cuz those are tooth supported, very short length, only on one side of arch

Inadequate occlusal vertical dimension will result in all except: 1. Cheek biting 2. Angular cheilitis 3. Denture stomatitis 4. TMD 5. Wrinkles

TMD

Functions of minor connectors:

1. Unification 2. Stress distribution - transfer stresses from major connector to other parts of RPD 3. Bracing

Define retention.

- resistance of RPD to dislodgement

Name 3 ways to affect flexibility of clasp

1. Length of clasp 2. Cross sectional form 3. Diameter 4. Material used

(T/F) guide planes should be cut before rest seats

True