Week 5- Class III Prep and Restore Flashcards
there are ______ color esthetic zones on a tooth
at least 3
when should you choose the shade and why
before placing the rubber dam because dehydrating tooth affects shade
how should you choose a shade
take shade from portion of shade guide most similar to thickness of restoration
what is the apperance of the shade of the gingival third of the tooth
opaque
what is the appearance of the shade of the incisal third of the tooth
translucent
what is the appearance of the middle third of the tooth
blend of shades of incisal and gingival
avoid margins ending in______
occlusal contact areas
when should you mark occlusion
prior to applying the dam
in a class III prep where is it acceptable to leave unsupported enamel
on the facial wall of the prep
- incisal contact
why is it okay to leave unsupported enamel on the facial wall of the prep
- esthetics improved
- discoloration and deterioration is less visible
- color match is easier
- facial enamel is conserved
- wedge shaped preparation
where are caries usually present in class III preps
- usually more lingual than facial
- gingival to contact area
how should the class III prep be prepared
perpendicular to long axis
what is the inciso gingival length of class III preps on maxillary lateral
1.5mm
what is the inciso gingival length of class III preps on maxillary central
2.0mm
what is the mesio distal width of class III preps on maxillary lateral
1.0mm
what is the mesio distal width of class III prep on maxillary central
1.5mm