The included studies reported few , if any , endodontic complications .
Little or no differences emerged between teeth restored with  composite resins  and those restored with amalgam .
Composite resin is used extensively for restoration of teeth with vital pulps .
Although cell culture studies have disclosed harmful effects on pulpal cells , any untoward clinical effects , manifest as adverse pulpal responses , have yet to be determined .
This study comprises a systematic review , design ed to address the question of whether the risk of endodontic complications is greater with  composite resin restorations  than with  other restorative material s  , such as  amalgam .
The effect of various preparation designs on the survival of porcelain laminate veneers.
PURPOSE The aim of this clinical study was to observe the service duration of  porcelain laminate veneers ( PLVs )  and to estimate the influence of the categorical covariates such as location , tooth vitality , preparation depth , incisal , gingival and proximal finishing lines , and peripheral tissue type on the survival rates of event-free and overall service duration . MATERIAL S AND METHODS A total of forty patients ( 26 women , 14 men ; age range : 16 to 50 ) who had received 200 PLVs were evaluated in this study . Median follow-up time was 67.25 weeks with a range of 12 to 72 weeks . Fifteen of the restored teeth were nonvital , while the remaining 185 were vital . Categorical covariates related to the restoration design ( localization , vitality , preparation depth , incisal , proximal , and gingival finishings , and surrounding tissue type ) were recorded in order to estimate their influence on the survival rates . Survival rates of the event-free and overall service duration were calculated with the Kaplan-Meier analysis and Mantel log rank test . RESULTS Twelve failures were observed . The most frequent failure type ( 11 units ) was debonding of the restoration from the abutment tooth . Nine of them were rebonded and the remaining 2 were remade with a different preparation design . The last failure was observed as a coronal fracture at the cervical level . The overall survival rates were 99.5 % , 99 % , 97.5 % , 94.9 % , 94.4 % and 93.8 % at weeks 8 , 9 , 11 , 15 , 16 , and 34 , respectively , with a mean estimate of 68.45 weeks . CONCLUSION PLVs exhibited good clinical results with their conservative specifications and high survival rates . The preparation and design specifications affect the service duration of PLVs
The included studies reported few , if any , endodontic complications .
Little or no differences emerged between teeth restored with  composite resins  and those restored with amalgam .
Composite resin is used extensively for restoration of teeth with vital pulps .
Although cell culture studies have disclosed harmful effects on pulpal cells , any untoward clinical effects , manifest as adverse pulpal responses , have yet to be determined .
This study comprises a systematic review , design ed to address the question of whether the risk of endodontic complications is greater with  composite resin restorations  than with  other restorative material s  , such as  amalgam .