#14MO Conventional Prep (Not Crossing the Oblique Ridge)

#14MO Conventional Prep (Not Crossing the Oblique Ridge) Isthmus is ≤1/3 the inter-cuspal width in the middle of the tooth. Small condenser should fit. Oblique ridge is not undermined; wall opposite the proximal box it is slightly divergent Proximal and gingival cavosurface margins: Buccal and lingual walls of proximal box forms a 90º angle with external surface of tooth- viewed from the occlusal (most critical for amalgam). Buccal, lingual, and gingival margins are smooth. If buccal and lingual walls of proximal box are flared or convergent approaching adjacent tooth when viewed from Axial wall depth or gingival floor width. Measured from the gingival cavosurface to the axial wall. Premolar depth= 1.0-1.5mm; Molar depth= 1.5- 2.0 mm