However , variability was substantial .
Restoration type , material s , the patient , the operator , the practice environment and type of care system appeared to influence longevity .
Objective To conduct a systematic review of the literature on the longevity of routine dental restorations in permanent posterior teeth , and to identify and examine factors influencing its variability .
A 14-year clinical assessment of 12 amalgam alloys.
After 14 years , 40 patients from an in vitro/in vivo study of 12 amalgam alloys were evaluated . All these patients had been attending private practitioners over the past 10 years , and the clinical evaluation revealed that 320 restorations were intact and 47 ( 12.8 % ) had been lost . The majority ( 75.0 % ) of the lost restorations were lost to crown placement or the replacement with another amalgam restoration . The six high-copper alloys exhibited better clinical performance , in both loss rate and fracture at the margins , than did traditional low-copper material s. Fracture at the margins was a better predictor of the loss of a restoration than were mechanical properties
However , variability was substantial .
Restoration type , material s , the patient , the operator , the practice environment and type of care system appeared to influence longevity .
Objective To conduct a systematic review of the literature on the longevity of routine dental restorations in permanent posterior teeth , and to identify and examine factors influencing its variability .