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Quintessence International
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Quintessence Int 24 (1993), No. 1     1. Jan. 1993
Quintessence Int 24 (1993), No. 1  (01.01.1993)

Page 39-44


Characterization of enamel exposed to 10% carbamide peroxide bleaching agents
Shannon / Spencer / Gross / Tira
The purpose of this investigation was to evaluate the effect of three 10% carbamide peroxide bleaching agents on enamel microhardness and surface morphology. Seventy-two enamel slabs were subjected to one of three carbamide peroxide solutions or an artificial saliva solution for 15 hours a day for 2- and 4-week periods. During the remaining 9 hours, slabs were exposed to human saliva in vivo. Although differences were not statistically significant, microhardness values of all treated specimens 2 weeks after treatment were less than those of control specimens. These trends, however, were not evident at 4 weeks. Scanning electron microscopic evaluation revealed significant surface alterations in enamel topography for slabs treated with the bleaching solutions for 4 weeks. The most severe alterations were found in slabs exposed to the lower-pH solutions.