1. RPD Treatment Review and Main Principles Flashcards
Purposes of denture classification
- Diagnose treatment complexity
- Communication with other dentists and labs
- Universally report treatment outcomes
What is the most common (highest incidence) Kennedy classification system
Class I
What is the most difficult kennedy class denture to fabricate
class I
What is the second most complex kennedy class denture
class II (and second highest incidence)
What are the 8 applegate rules
- 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
What kennedy classes are tooth supported and what are tooth-tissue supported
tooth= 3, 4
tooth-tissue= 1, 2
Define physiologic tolerance
the amount of stress an object can tolerate without traumatic consequences
Rotational movement of the denture occurs in how many planes and what are they
3
- Frontal
- Sagittal
- Horizontal (coronal)
For tooth supported RPD the greater potential movement is (frontal/horizontal/sagittal) during function which is resisted by….
Horizontal (lateral) …. reciprocal arms and minor connectors
The trasfer of forces to the abutment teeth are most favorable when directed how
- As vertical as possible
- Closer to the horizontal axis of rotation
- Closer to the center of the tooth
Clasps should be placed where on what thirds of the teeth
middle and gingival third
What factors influence the flexibility/rigidity of clasps
- 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)
Indirect retention is required for what kennedy class dentures
I, II, and IV
Clasps should be _-_mm from the gingiva and why
1.5mm- 2mm (prevent food entrapment without impinging gingiva)
What are the 4 goals of the major connector
- 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
A major connector can only provide cross arch ability if
it is rigid enough (usually requires full palatal coverage)
What factors influence the major connector’s rigidity
material
dimensions
shape
What factors influence whether or not the major connector will impinge on soft tissue
location and relief
The gap required between the mandibular major connector and the gingival margin is… maxillary?
4mm… 6mm
Purpose of minor connectors
connect attachments to the major connectors
The minor connectors should pass (vertically/horizontally) from the major connector with (subtle/abrupt) gingival crossing
vertical… abrupt
The prep for a rest should be (greater/less) than 90 degrees
less
Main purpose of a rest
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
6 requirements of a clasp assembly are
- Retention
- Reciprocation
- Passivity
- Encirclement
- Support
- Stability
