Design 1 Flashcards
what comes through palatine fovea?
minor salivary ducts
Kennedy classification
Kennedy Class I: bilateral free end saddle
Kennedy Class II: unilateral free end saddle
Kennedy Class III: bounded saddle
Kennedy Class IV: anterior bounded saddle that crosses midline
problems with Kennedy Class I
- differential movement (bc tooth and mucosa borne)
- needs optimal coverage of tissues in saddle areas to minimise rotation
problems of Kennedy Class II
same as I and III, plus
can be most challenging due to extension on free end saddle and correct direct retention
problems of Kennedy Class III
not so many, as tooth supported unless there is periodontal disease
direct retention important
problems of Kennedy Class IV
opposite of Kennedy Class I: tooth-supported, less problems
how are Kennedy modifications classified?
by most posterior edentulous area
what does the mod number mean
additional number of teeth missing
advantages of mucosal borne dentures
- cheap
- easily added to
- good preparation for complete dentures (to get used to)
- can be used on pt with periodontal disease
- can be used on young children
advantages of tooth borne dentures
- forces directed through periodontal ligament
- if designed correctly, no damage to denture foundation
- well-tolerated
2 outcomes of excessive force on dentures
- bone resorption
- mobility of teeth
3 ways to plan support for dentures
- root area of abutment teeth
- saddle extension
- force expected on saddles
when are each of these clasp materials used and why:
a. cobalt chrome
b. stainless steel
c. gold
a. cobalt chrome: 0.25mm undercut. most rigid
b. stainless steel: 0.5mm undercut
c. gold: 0.75mm undercut. most flexible
why must undercut areas be known for denture design
- rigid parts of denture must lie outside undercut area
- flexible parts of denture go in to undercut
4 factors influencing path of insertion
- retention
- guide surfaces
- aesthetics
- dead space interferences
