Partial Denture 3
Designing of a prosthesis requires following consideration:
Biological
Mechanical
Esthesic
All are corrected
Rotation in a distal extension denture base occurs because of differences in displaceability of:
Periodental ligament
Supporting abutment teeth
Soft tissue of residual ridge
All are corrected
Classification of lever system is based on location of:
Resistance
Direction of effort
Fulcrum line
All are corrected
Impression materials that may be used to register the supporting form of edentulous area in an distal extension denture base are following, except:
Waxes
Silicone impression materials
Impression paste
Hydrocolloids
In a class III situation, the retentive tip should be:
Active
Active only during placement and removal
Passive normally
Active only during placement and removal and Passive normally
Guiding planes may be contacted by following parts of partial denture, except:
Body of extracoronal direct retainer
Stabilizing arm direct retainer
Minor connector of indirect retainer
Minor connector of denture base
Guiding planes which are not in the same parallel plane horizontally:
Decrease the stabilization
Enhance cross-arch resistance to horizontal rotation
Decrease cross-arch resistance to horizontal rotation
Increase the food trap
Following are the intended functions of guiding planes, except:
Provide one path of placement
To support the retainer arm and reciprocal arm
Ensure intended action of retainer
Eliminate food trap
The minor connector that contacts the guiding plane:
Has the same contour as guiding plane
Is thicker lingually than buccally
Has the same contour as guiding plane and Is thicker lingually than buccally
No change in thickness buccolingually
The reduced thickness of minor connector contact guiding plane buccally:
Helps in more resistance to forces
Prevents food trap more efficiently
Helps to abut the artificial tooth more closely to natural tooth
Helps in stability
Functions of guiding planes are:
Ensuring definite path of placement
Ensure predictable clasp retention
Ensuring definite path of placement and Ensure predictable clasp retention
They make all the teeth parallel to each other
Clasp retention is:
Perpendicular to path of placement
Resistance of metal to deformation
Perpendicular to path of placement and Resistance of metal to deformation
Tight holding of tooth by the clasps
When anterior teeth are to be replaced, the best path of placement that can be selected is:
Right lateral
Vertical
Horizontal
Antero-posterior
The main aim of anterior-posterior tilt of the cast during surveying is to establish:
Good esthetics
To provide parallel proximal surfaces
To avoid interferences
To determine retention
Non-retentive clasp arm is best placed at the:
Gingival third of the tooth
Between occlusal and middle third
Between middle and gingival third
On the occlusal third
The relation of the cast to surveyor can be recorded in the following manner:
By scoring the base of the cast
By tripoding with tiny pits
By scoring as well as tripoding with pits
By tilting the joint of the surveyor table
Kennedy classification is determined by:
The most anterior tooth missing
The first tooth to be lost
The largest tooth in the space
The most posterior tooth missing
Tripoding is the method used:
For giving clasp assemblies at 3 points
For recording the relation of the cast to the surveyor
To determine the areas on the tooth where the gingivally approaching clasp, occlusal rest of the reciprocal arm are going to placed
To have reproducible position of the cast on the surveyor
What are the functions of an indirect retainer:
To prevent horizontal dislodgement of the distal extension base of a RPD
To connect the parts of the prosthesis located on one side of the arch with those on the opposite side
To prevent vertical dislodgement of the distal extension base of a RPD
To link the major connector and other parts of the prosthesis together
In general, lingual plating should be supported:
By the inclined surfaces of the mandibular incisors
With minor connectors
With bracing arms
With rests
A removable partial denture may be:
All tooth supported
Tooth and tissues supported
All tooth supported and tissues supported
All tissues supported
Following condition(s) is/are also called as distal extension partial denture:
Kennedy class IV
Kennedy class IV mod. I
Kennedy class I
Kennedy class I mod. I
In which of following mandibular position would you find the greats increase in VDO from centric occlusion?:
Centric relation
Maximum protrusion
Anterior edge-to- edge position
Postural position
The kennedy classification of this RPD is…….in the mandibular with missing teeth #38, 37, 36 #31, 32#41, 42, 43, 47, 48:
Class IV mod. II
Class II mod. I
Class I mod. II
Class I mod. I
The kennedy classification of this RPD is…….in the mandibular which lost all posterior teeth on both side:
Kennedy class II
Kennedy class I
Kennedy class I mod. I
Kennedy class II mod .I
The kennedy classification of this RPD is…….in the mandibular with missing teeth #35, 36 #46:
Kennedy class III
Kennedy class III mod. I
Kennedy class IV mod. I
Kennedy class II mod. I
The kennedy classification of this RPD is…….in the mandibular with missing teeth #45, 46, 47:
Kennedy class III mod. I
Kennedy class III mod. II
Kennedy class III
Kennedy class III mod. III
All of the following clasps are infrabulge clasps except:
I bar
Modified T bar
Roach clasp
Aker clasp
A tissue undercut may preclude the selection of:
A suprabulge clasp
An infrabulge clasp
A half and half clasp
A combination clasp
The open lattice type on a maxillary class I Removable Partial Denture:
Covers the hamular notch
Covers the tuberosity
Does not cover the tuberosity
Does not require substantial inter arch space
Physiologic Rest in a position of vertical dimension which can be recorded with:
Centric relation
Centric occlusion or MIP
Edge to edge incisor contact
Posselt’s envelope
Use long guide plane on class IV kennedy for:
Retention denture base
Stabilization denture base
Path of insertion
Esthetic denture
Retentive tip of a clasp should usually be designed to be placed in:
The occlusal 1/3
The gingival 1/3
The occlusal 2/3
The gingival 2/3
Height of contour determine is a:
Path of insertion
Placed of clasp
Proximal plate
Infrabulge and suprabulge
Reciprocal clasp arm of RPD should be:
Horizontal force
Vertical force
Direct contact
Lied above high of contour
What is the most common use material for casting framework of RPD:
Platinum
Titanium
Nickel chrome
Chrome cobalt
The external finish line on a maxillary class I RPD originates from the lingual of the guide plane of the terminal abutment and ends:
At the hamular notch
In the glenoid fossa
Opposite the buccal pouch
Opposite stenon’s duct
The gridwork minor connector on a maxillary class I removable partial denture:
Covers the hamular notch
Covers the tuberosity
Does not cover the tuberosity
Covers the crest and tuberosity
The Removable Partial Denture design should be finalized prior to:
Any emergency treatment
Any fixed prosthodontics treatment and preparation of rest seats
Remove third molar
Remove crown bridge
Guide plates for anterior teeth:
Should be kept to the labial for esthetics
Should be kept to the cingular for esthetics
Should be kept to the proximal faces for esthetics
Should be kept to the lingual and be thinned on labial for esthetics
Component of a clasp assembly is:
One rest, a retentive arm, a bracing or reciprocating element, one minor connector
One or two rests, a retentive arm, a bracing or reciprocating element and one or two minor connector
One minor connector, one major connector, one rest, one retentive arm, one bracing or reciprocating element
Two minor connectors, one major connector, one rest, one retentive arm, one bracing or reciprocating element
In a class III modification 1 RPD, the rests are usually placed:
On the canines
Away from the modification space
In the area of the opposing occlusal contact
Adjacent to the modification space
The presence of mandibular lingual tori would indicate the need for:
A metal base
Lingual plating
Tube teeth
Extra indirect retainers
Rigid metal retention is associated with:
A dual path of insertion
A class IV RPD
The need for excellent esthetics
All are correct
What is the correct relationship of the foot of an-I bar to the survey line (height of contour) on abutment for an extension RPD:
The foot should be entirely above the survey line
The foot should be entirely above and partially below the survey line
The foot should be totally below the survey line
The relationship of the foot of the I –bar and the survey line of no consequence
A general rule for rest placement on an abutment adjacent to an extension area is:
Place the rest on the occlusal surface on the opposite side of the tooth from the extension area
Place the rest on the occlusal surface adjacent to the extension area
Place the rest on both the mesial and distal occlusal surfaces
Do not place a rest on this tooth
Physiologic adjustment of the framework:
Is usually done at delivery of the RPD
Should be done at the framework try-in appointment
Is usually done at the records appointment
May be omitted in the presence of strong abutments and good residual ridges
Physiologic adjustment of the framework is related to:
The axis of rotation
The areas of edentulous space
The number of abutments
External finish line
Physiologic adjustment of the framework is related to:
Adjustment of the framework to the teeth
Internal finish line
The classification of kennedy
The residual ridge and teeth
Physiologic adjustment of the framework is related to:
Functional movement of the framework
The major connector and natural teeth
The minor connector and natural teeth
The rest and indirect retainer
The internal and external finish line is:
Normally superimposed over each other
Normally off set from each other to avoid weakness in the framework
Normally designed and placed independently
None of the above statements are true
What is component of a clasp assembly is:
One or more minor connectors
One or more major connectors
One or more denture bases
One or more proximal plates
An ideal clasp assembly should possess the following quality
Support and rotation
Support
Support and protrusion
Support and deduction
An ideal clasp assembly should possess the following quality:
Retention with denture base
Retention with major connector
Retention with minor connector
Retention
An ideal clasp assembly should possess the following quality:
Elasticity
Reciprocation
Kind of metal
Weight of metal
An ideal clasp assembly should possess the following quality:
45 degree encirclement
90 degree encirclement
160 degree encirclement
180 degree encirclement
The best clasp assembly for a terminal abutment on a mandibular class I RPD is:
Mesial rest and I- bar clasp
Mesial rest and back action clasp
Distal and mesial rests
Distal and mesial rests half and half clasp
The guide surface or guide plate preparation should be curved:
Mesio-distally
Bucco-lingually
Occlusio-gingivally
Mesial and distal parallelism
Important factors in determining the path of insertion/dislodgement is:
Potential guide surfaces
Depend on survey line
Depend on patient
Quality of framework
Important factor in determining the path of insertion/dislodgement is:
Undercuts for direct retainer
Depend on infrabulge and suprabulge
Depend on edentulous areas
None of above
Important factor in determining the path of insertion/dislodgement is:
Hard and soft tissue interferences
Depend on of abutments
Depend on force of mastication
Depend on attitude the patient
Important factor in determining the path of insertion/dislodgement is:
Esthetic considerations
Depend on impression
Depend on design tray
Depend on secondary impression
The total retention for a RPD is obtained from:
Denture style retention(adhesion ,cohesion ,interfacial surface tension)
Major connector and minor connectors
Natural teeth and major connector
Pontic with major connector
The total retention for a RPD is obtained from:
Fictional retention from guide surface/guide plate contacts
Artificial teeth with major connector
Artificial teeth with natural teeth
Occlusion of artificial teeth
The total retention for a RPD is obtained from:
Mechanical retention from clasps (direct retainer
Mechanical retention from major connector
Mechanical retention from minor connectors
Mechanical retention from grid work
A distal extension partial denture receives its support :
from terminal abutments
equally from abutments and the residual ridges
mostly from residual ridge
exclusively from residual ridge
Advantages of resin bases is :
dimensional stability-warp
lower strength / wear resistance than metal
porous – hygiene
esthetically superior to metal bases
Metal bases use :
big edentulous space
small edentulous space (no room for grid work)
for anterior edentulous space
for posterior edentulous space
Function of denture bases :
support and retain denture teeth
stress distribution surface area
improve esthetics
all are corrected
The support for a RPD is usually :
tooth support
mucosa support
occlusal rest support
tooth and mucosa support
The mandibular distal extension RPD extends up to :
full length of retromolar pad
anterior one third length of retro –molar pad
anterior 2/3 of retro-molar pad
just behind abutment
Distal extension RPD is :
both tissue and tooth borne
tissue borne
class III condition
class IV condition
If a third molar is absent and not to be replaced :
it is not consideration in the classification of partial dentures
it may or may not be considered
it is considered important for classification
none applies
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