Jw. Osborne et Tg. Berry, THE EFFECT OF SETTING TIME ON THE CLINICAL-PERFORMANCE OF A HIGH-COPPER AMALGAM ALLOY, Operative dentistry, 20(1), 1995, pp. 26-29
The purpose of this clinical study was to evaluate the factor of the s
etting 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 d
am throughout the restorative procedure and prepared cavities as conse
rvatively 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 indic
ated that there was no significant clinical difference between a slow-
and fast-setting alloy, nor was there a difference between the operato
rs.