An ideal Class II cavity preparation for an amalgam restoration in a primary molar should have a
reverse curve
rounded axiopulpal line angle.
proximal box that diverges occlusally
definite bevel on the gingival cavosurface angle
proximal retention grooves
1 explanations
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Note:
1. A sharp angle between the pulpal floor and the axial
wall of the cavity should be avoided. Rounded angles
throughout the preparation will results in less
concentration of stresses and will permit adaptation
of the restorative material into the extremities of the
preparation. (page 210)
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