The effect of setting time on the clinical performance of a high-copper amalgam alloy.
The purpose of this clinical study was to evaluate the factor of the setting rate/Eames working time on fracture at the margins of amalgams. One batch of a high-copper amalgam was modified to obtain two setting rates, one fast and one slow setting. Two dentists originally placed 134 amalgam restorations in 23 patients. Both dentists used a rubber dam throughout the restorative procedure and prepared cavities as conservatively as possible. The amalgams were condensed by hand and carved with sharp instruments. At 1 year 124 restorations and at 2 years 115 restorations were evaluated for fracture at the margins. Results indicated that there was no significant clinical difference between a slow- and fast-setting alloy, nor was there a difference between the operators.
Osborne
J W
JW
Restorative Dentistry, University of Colorado Health Sciences Center, Denver 80262, USA.
Berry
T G
TG
D000497:Alloys / Q000737:chemistry*; D001641:Bicuspid; D003300:Copper; D003723:Dental Amalgam / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D008422:Materials Testing; D008963:Molar; D015588:Observer Variation; D011475:Prosthesis Failure; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013997:Time Factors
D000497:Alloys; C098760:zenith premium alloy; D003300:Copper; D003723:Dental Amalgam