Crowns for anterior teeth Flashcards
Why do anterior teeth need crowned?
extent of caries and restoration
trauma
following RCT
failure of direct restorations and/or veneers
aesthetics
Anterior crowns - things to be cautious about
uncontrolled caries and periodontal disease
tooth wear
smilorexia/unrealistic expectations
heavily restored dentitions
age
cost
Types of anterior crowns
metal-ceramic
lithium disilicate
zirconia
feldspathic porcelain
Properties of zirconia for crowns
very strong - can be used for posteriors
good aesthetics - less translucent than lithium disilicate and metal-ceramic crowns
requires least reduction - preserves tooth tissue
very durable and highly wear resistant
can withstand higher forces - most ideal for posteriors
properties of lithium disilicate for crowns
not as strong as zirconia and metal ceramic
excellent aesthetics
requires more reduction than zirconia
less durable than zirconia
gives optimal aesthetics - ideal for anteriors
properties of metal ceramic crowns
very strong - anterior palatal metal
excellent aesthetics, less translucent than lithium disilicate
requires most reduction
very durable
- can have issues with porcelain fracture
can withstand higher forces and wear - suitable for anterior and posterior teeth
name the 6 principles of tooth preparation
preservation of tooth structure
retention and resistance
structural durability
marginal integrity
preservation of the peridoontium
aesthetic considerations
principles of tooth substance removal
appropriate but not excessive
follow anatomical form
take account of promity of pulp to incisal aspect
- look at radiographs
look at parafunction, occluso-gingival height and aesthetics
material dependent
under preparation consequences
aesthetic problems
- opacity
periodontal problems
- emergence and inflammation
result = biological and aesthetic failure
Anterior metal ceramic crown preparation dimensions
1.5mm labial shoulder reduction
