Preparation and restoration of small interproximal carious lesions with sonic instruments.

Partially diamond-coated oscillating preparation instruments are particularly suited for cutting minute interproximal cavities. This review presents an oscillating preparation system with newly designed working tips for cutting and finishing proximal microcavities. Analysis of the margins of various cavity designs prepared with this instrumentation exhibited outlines that were essentially free of defects. The method and instruments presented allow cutting of minute first intervention cavities of interproximal lesions with defect-related extension. Enhanced margins can be attained without concomitant damage to adjacent tooth surfaces.