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 .
Clinical evaluation of four amalgam alloys: a five-year report.
In this study 96 teeth of 12 patients were restored with either the conventional alloy Premix , the blended non-gamma 2 amalgam Dispersalloy , or one of the spherical alloys Sybraloy and Tytin . To ascertain an objective comparison of the clinical performance of these alloys , two different alloys were used in each of at least two dental arch quadrants in the same patient and consequently were placed in the same oral environment . Clinical performance of the restorations was evaluated by macrophotography and scanning electron microphotography of replicas made after placement and 2 , 3 , and 5 years thereafter . St and ard criteria were used for the evaluation of anatomic form , surface condition , and marginal adaptation of the fillings . In addition , the filling-enamel interface was assessed from the microphotographs . The three high-copper alloys performed better clinical ly than the conventional alloy , and the spherical alloys had the best qualifications . In addition to visual examination and photographic evaluation of restorations , the micrometric assessment of replica photographs from the scanning electron microscope may render clinical trials of amalgam alloys measurable and less subjective
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 .