CAVITY PREPARATION
Class 1 Amalgam
•External outline form:
•      - Dovetail
•      - Inclusion of pits, fissures, grooves, caries
•      - Extension of occlusal portion varies
•         depending on primary molar involved
•      - Slight occlusal convergence of walls
•      - Sharp cavosurface margins
•      - Adequate tooth structure at marginal ridges
•      - Width of prep 1/3 of occlusal table
•      - Rounded line angles
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