1. RPD Treatment Review and Main Principles

Question 1

Purposes of denture classification

Answer 1

• Diagnose treatment complexity
• Communication with other dentists and labs
• Universally report treatment outcomes

Question 2

What is the most common (highest incidence) Kennedy classification system

Answer 2

Class I

Question 3

What is the most difficult kennedy class denture to fabricate

Answer 3

class I

Question 4

What is the second most complex kennedy class denture

Answer 4

class II (and second highest incidence)

Question 5

What are the 8 applegate rules

Answer 5

• Classification is determined based on the most posterior edentulous area.
• Class IV can’t have a modification space
• Modification spaces are edentulous regions not used for the classification
• If the 3rd molar is present and is going to be used as an abutment it is included in the classification
• If the 2nd molar is absent and isn’t being replaced then it is not considered in the classification
• If a 3rd molar is missing and is not being replaced then it is not considered in the classification
• Classification should follow extractions of teeth
• The extent of the modification is not considered only the number of additional edentulous spaces

Question 6

What kennedy classes are tooth supported and what are tooth-tissue supported

Answer 6

tooth= 3, 4

tooth-tissue= 1, 2

Question 7

Define physiologic tolerance

Answer 7

the amount of stress an object can tolerate without traumatic consequences

Question 8

Rotational movement of the denture occurs in how many planes and what are they

Answer 8

3

• Frontal
• Sagittal
• Horizontal (coronal)

Question 9

For tooth supported RPD the greater potential movement is (frontal/horizontal/sagittal) during function which is resisted by….

Answer 9

Horizontal (lateral) …. reciprocal arms and minor connectors

Question 10

The trasfer of forces to the abutment teeth are most favorable when directed how

Answer 10

• As vertical as possible
• Closer to the horizontal axis of rotation
• Closer to the center of the tooth

Question 11

Clasps should be placed where on what thirds of the teeth

Answer 11

middle and gingival third

Question 12

What factors influence the flexibility/rigidity of clasps

Answer 12

• Design (i.e C clasps is more rigid than I bar)
• Material (Wrought wire is more flexible than cast due to its round shape)
• Position
• Length (The longer the more flexible)

Question 13

Indirect retention is required for what kennedy class dentures

Answer 13

I, II, and IV

Question 14

Clasps should be _-_mm from the gingiva and why

Answer 14

1.5mm- 2mm (prevent food entrapment without impinging gingiva)

Question 15

What are the 4 goals of the major connector

Answer 15

• Unifies all parts of the framework
• Distributes the forces throughout the arch to the selected teeth and tissue
• Minimizes the torque of the individual teeth
• Cross-arch ability

Question 16

A major connector can only provide cross arch ability if

Answer 16

it is rigid enough (usually requires full palatal coverage)

Question 17

What factors influence the major connector’s rigidity

Answer 17

material
dimensions
shape

Question 18

What factors influence whether or not the major connector will impinge on soft tissue

Answer 18

location and relief

Question 19

The gap required between the mandibular major connector and the gingival margin is… maxillary?

Answer 19

4mm… 6mm

Question 20

Purpose of minor connectors

Answer 20

connect attachments to the major connectors

Question 21

The minor connectors should pass (vertically/horizontally) from the major connector with (subtle/abrupt) gingival crossing

Answer 21

vertical… abrupt

Question 22

The prep for a rest should be (greater/less) than 90 degrees

Answer 22

less

Question 23

Main purpose of a rest

Answer 23

vertical support (axial loading of abutments)

• Maintain components in their planned positions
• Maintain established occlusal relationships by preventing settling of the denture
• Prevents impingement of soft tissue

Question 24

6 requirements of a clasp assembly are

Answer 24

• Retention
• Reciprocation
• Passivity
• Encirclement
• Support
• Stability

Question 25

Indirect retainers can take the form of

Answer 25

• Rests

- Proximal plates

Question 26

Describe the relationship between the distance between the indirect retainer and the fulcrum

Answer 26

the further the more efficient at controlling movement

Question 27

Indirect retainers on the mandibular and maxillary arches are activated when

Answer 27

Mandibular= sticky foods
Maxillary= sticky food and gravity

Question 28

Criteria for indirect retainer selection

Answer 28

• Location of abutment in relation to fulcrum
• Individual tooth prognosis
• Dental morphology- Can’t place indirect retainer on a sloped surface

Question 29

Why are indirect retainers uncommon on lower anterior teeth

Answer 29

• Esthetics

- They lack prominent cingulums (can’t put indirect retainer on a sloped surface)

Question 30

T/F An indirect retainer doesn’t always have to be a minor connector

Answer 30

T- can be a part of the main connector

Question 31

Ideal denture base material properties

Answer 31

• Accuracy of adaptation (minimal volume change)
• Dense surface (non-porous, highly polishable, hygiene)
• Thermal conductivity
• Low specific gravity
• Sufficient strength and resistance to fracture (rigid)
• Cleansable
• Esthetic
• Future reline potential
• Low initial cost

Question 32

Advantages of metal bases

Answer 32

• Accurate
• Permanence of form- no volume change in mouth
• Dense (non-porous, polishable)
• Thermal conductivity
• Light weight
• Strong
• Cleansable

Question 33

Disadvantages of metal base

Answer 33

• Cost
• Esthetics
• No relining possible
• Not appropriate when thickness is needed (cost and weight)