An in vitro assessment of circumferential grooves on the retention of cement-retained implant-supported crowns.

Statement Of Problem: Crowns cemented on short implant abutments may have insufficient retention.

Purpose: The purpose of this study was to evaluate the effect of circumferential grooves on the retention of cemented cast copings on implant abutments.

Material And Methods: Sixty similarly-shaped implant abutments were divided into 4 groups (n=15): without grooves, with 1 groove, with 2 grooves, and with 3 grooves.