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Quintessence International



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Quintessence Int 38 (2007), No. 3     2. Feb. 2007
Quintessence Int 38 (2007), No. 3  (02.02.2007)

Online Article, Page 174, PubMed:17668086

Online Article: Penetration of silver nitrate into bleached enamel, dentin, and cementum
Iwamoto, Nanako / Shimada, Yasushi / Tagami, Junji
Objective: To observe the effect of 10% carbamide peroxide bleaching agent on the enamel, dentin, and cementum of human teeth. Method and Materials: Teeth were treated with one of two 10% carbamide peroxide bleaching agents (3M Zaris, 3M Espe; Nite White Excel, Discus Dental) for 2 hours/day for 7 or 14 days. Treated teeth and 10 additional nontreated teeth were immersed in 50% silver nitrate solution. The prepared surface was then viewed under a confocal laser scanning microscope, photomicrographs were taken, and the degree of penetration of silver nitrate into the structure of bleached teeth was determined.
Results: No penetration was seen in enamel of any group, and statistical analysis showed a significant difference in the degree of penetration only between treated and nontreated groups of dentin and cementum (P < .05). No significant difference was seen between 7 and 14 days.
Conclusion: Although the effect was not significant, further investigation is needed to determine the effect of long-term treatment of carbamide peroxide on human tooth substance.

Keywords: carbamide peroxide, cementum, dentin, enamel, penetration, silver nitrate