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 .
Dental restoration longevity: survival functions and statistical indices in low and high failure rate groups.
A group of 71 patients was examined to determine the longevity of restorations placed at the University of North Carolina School of Dentistry . Patients with an overall restorations failure rate of equal to or greater than 40 per 1000 restoration-yr were categorized as having a " high failure rate " and those below that were considered " low failure rate " . An investigation was made to determine statistical differences between these two groups of patients using survival analysis and various statistical indices . Time of exposure and age of patients for both groups were similar . High rate patients had a greater number of anterior restorations and anterior teeth restored . In addition , the number of restorations per tooth was significantly greater in anterior and posterior teeth of the high failure rate group . No single variable was found to account for the differences in the failure rates in the two groups of patients . A prospect i ve study is needed in order to examine possible causes for restoration failures
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 .