PROS 8124 Study Guide - Final Guide: Putty, Gingival Margin, Working Time
12 Apr 2020
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Lingual reduction 1-1. 2 mm: 2 plane reduction on facial (1. 2 --> 1. 5 --> 1. 5) Lingual reduction and clearance (lingual fossa: 1-1. 2 mm reduction, 1. 2-1. 5 mm clearance (fits the ball burnisher) Large end of ball burnisher: needle diamond with black stripe or modified shoulder taper with green stripe, slightly overtaper to avoid hitting other teeth. Insufficient axial reduction results in overcontoured restorations to have enough bulk: can cause perio disease or caries. If there is an error, an undercontoured restoration is better: margin placement (location) Indication not recommended: chamfer, advantages distinct margin, adequate bulk, disadvantage care needed to avoid unsupported lip of enamel. Indications cast metal crowns (they don"t need as much bulk), metal-ceramic crowns: modified shoulder, advantage bulk of restoration, disadvantage less conservative tooth structure. Less with anterior preps than posterior teeth: mandibular teeth preps have greater toc than maxillary teeth (access and visibility, clinically acceptable = 10-20 deg, surface area.
