Back to AI Flashcard MakerNursing /BDS2 OSCE Prep - RPD OSCE Part 2
Why are small rests NOT recommended?
They apply large forces per unit area… | - Large rests direct the force down the long axis of the tooth
Tap or swipe ↕ to flip
Swipe ←→Navigate
1/32
Key Terms
Term
Definition
Why are small rests NOT recommended?
They apply large forces per unit area… | - Large rests direct the force down the long axis of the tooth
Why are incisal rests not commonly used?
Poor aesthetics | Usually interferes with occlusion
Where are cingulum rests most commonly located?
On maxillary and mandibular canines | - Unless prominent cingulum is present A REST PREPARATION IS REQUIRED
What material type denture base is preferred? Why?
Metal framework base > PMMA (acrylic resin) base | - metal framework rigid and strong
What is the root to crown ratio for lower central and lateral incisors?
1.0
What is the root to crown ratio for lower canines?
1.7
Related Flashcard Decks
Study Tips
- Press F to enter focus mode for distraction-free studying
- Review cards regularly to improve retention
- Try to recall the answer before flipping the card
- Share this deck with friends to study together
| Term | Definition |
|---|---|
Why are small rests NOT recommended? | They apply large forces per unit area… | - Large rests direct the force down the long axis of the tooth |
Why are incisal rests not commonly used? | Poor aesthetics | Usually interferes with occlusion |
Where are cingulum rests most commonly located? | On maxillary and mandibular canines | - Unless prominent cingulum is present A REST PREPARATION IS REQUIRED |
What material type denture base is preferred? Why? | Metal framework base > PMMA (acrylic resin) base | - metal framework rigid and strong |
What is the root to crown ratio for lower central and lateral incisors? | 1.0 |
What is the root to crown ratio for lower canines? | 1.7 |
What is the root to crown ratio for lower 1st & 2nd premolars? | 1.25 |
What is the root to crown ratio for lower molars? | 2.7 |
What is the root to crown ratio for upper central incisors? | 1.3 |
What is the root to crown ratio for upper lateral incisors? | 1.1 |
What is the root to crown ratio for upper canines? | 1.7 |
What is the root to crown ratio for upper 1st and 2nd premolars? | 1.4 |
What is the root to crown ratio for upper molars? | 2.7 |
Where is the ‘default’ position to place a rest for a bounded saddle? | immediately adjacent to the saddle area. |
Where is the ‘default’ position for a rest in a free ended saddle? | The rests should be placed on the opposite side of the tooth adjacent to the saddle area (eg. mesial of tooth) |
Why can preparing a rest seat potentially be problematic? | destruction of tooth surface | - exposure of dentine |
What is a clasp ? | A metal arm that when in position contacts the tooth and prevents removal of the denture base |
Where must the clasp be located in order to be successful? | Below the bulbous part of the tooth (in an undercut) |
What are the different types of clasps known as? | occlusally approaching (clasps approach undercut from occlusal surface) gingivally approaching (clasps approach undercut from gingival margin) |
What is an example of a gingivally approaching clasp? | I-Bar Clasp |
What are examples of occlusally approaching clasps? | self reciprocating clasps | - single arm clasp (with reciprocal arm) |
What is the ideal pattern of retention? | Triangular (as big as possible) |
What pattern of retention is provided by 2 claps? | straight line retention |
what is meant by CONNECTORS? | A term used to describe the rigid part of a RPD that unites all the components minor connectors major connectors |
What are the guidelines a major connector should follow? | be rigid avoid covering gingival margins cover as little tissue has possible |
What is the default connector for a lower RPD? | Lingual bar if possible |
There is less than 8mm of lingual space on the lower arch, what connector will be used? | Lingual plate design |
How thick should a lingual bar be to maintain rigidity? | 2mm |
What connector design is desirable for a craddock class 2 denture? (mucosa borne) | Plate design |
What is the common choice connector design for a craddock class 1? (tooth borne) | Bar design |
What is the purpose of the RPI clasp system? | Stress relieving system | - prevents torking/rotation/tilting of the last standing abutment tooth |
What length should a CoCr clasp be? | 15mm |