Effect of different grit sizes of diamond rotary instruments for tooth preparation on the retention and adaptation of complete coverage restorations

A selection of abstracts of clinically relevant papers from other journals. The abstracts on this page have been chosen and edited by John R. Radford.

Abstract

Less microleakage but no effect on the retention of full coverage crowns when preparations were finished with smaller grit size diamond burs.

Main

Li Y, Wang H et al. J Prosthet Dent 2012; 107: 86–93

This in vitro study carried out on 92 extracted premolar teeth, examined 1) microleakage between the preparation and casting, and 2) the retentive characteristic of nickel-chromium full-coverage crowns, following tooth preparation using burs with different diamond grit sizes. The number of teeth in each experimental group was small (n <8). The following bur grit sizes were examined: 125-150 μm, 106-124 μm, 53-63 μm and 20-30 μm. The burs were used sequentially starting with the most course grit size before proceeding onto those that were more fine. Castings were luted with glass ionomer cement. The use of smaller grit size diamonds burs was associated with less microleakage. However, grit size had no effect on the retention of full crowns.