Effect of different cement types on monolithic lithium disilicate complete crowns with feather-edge preparation design in the posterior region.

STATEMENT OF PROBLEM Ideally, tooth preparation for complete crowns should require the removal of the smallest amount possible of sound tooth structure to maximize the strength of the remaining tooth. Some preparation designs, such as the feather-edge margin, are less invasive. However, limited data are available regarding monolithic lithium disilicate crowns for molars and premolars with this type of margin geometry. PURPOSE The purpose of this retrospective study was to evaluate the clinical outcome and survival of monolithic lithium disilicate crowns in the posterior region fabricated with feather-edge margins and cemented either with conventional (glass ionomer) or resin self-etching cement in 2 private practices. MATERIAL AND METHODS A total of 257 monolithic lithium disilicate restorations on posterior teeth (108 premolars, 149 molars) were placed in 158 patients. All teeth were prepared with feather-edge margins and restored with single crowns. The modified California Dental Association (CDA) criteria were used to clinically evaluate participants recalled between June and December 2014. RESULTS The mean ±standard deviation follow-up time was 24 (±13.6; range: 6-75) months. Three crowns were replaced during the follow-up period because of the bulk fracture of the material (98.83% survival rate). No other technical or biological failure was observed. CONCLUSIONS In this retrospective evaluation, monolithic lithium disilicate crowns with feather-edge margins yielded clinical outcomes similar to those reported with other margin designs and materials.