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The aim of this in vitro study was to examine the effect of four commercial hydrogen-peroxide-based home bleaching agents on enamel microhardness. Fifteen human molars conserved in water for no more than 3 months were sectioned mesio-distally. The buccal and lingual surfaces were included in self curing acrylic resin, and the 30 specimens were ground until 600 grid (n=6). At baseline, 6 indentations (Vickers) were made on each of the 6 surfaces of each group, under load of 100g for 30s. Bleaching procedure was performed for 2 weeks with: 4.5% hydrogen-peroxide (Perfecta, Premier), 5.5% hydrogen-peroxide (DayWhite, Discus Dental), 7.5% hydrogenperoxide (DayWhite, Discus Dental), a polyethylene-strip whitening system containing 5.3% hydrogen-peroxide (Whitestrips, Procter&Gamble) and 10% carbamide peroxide (Opalescence, Ultradent) was used as control. After bleaching time, the specimens were rinsed and maintained in fresh artificial saliva, changed daily. A t-test compared each bleaching agent before and after treatment. The results showed that none of the five commercial home bleaching agents reduced the enamel microhardness. I t was concluded that all the five commercial home bleaching agents evaluated in our study showed no adverse effects on enamel microhardness.References
Haywood VB. History, safety and effectiveness of current bleaching techniques and applications of the nightguard vital bleaching technique. Quintessence Int. 1992; 23: 471-88.
Haywood VB, Heyman HO. Nightguard vital bleaching. Quintessence Int. 1989; 20: 173-6.
Smidt A, Weller D, Roman I, Gedalia I. Effect of bleaching agents on microhardness and surface morphology of tooth enamel. Am J Dent. 1998; 11: 83-5.
Fasanaro TS. Bleaching teeth: history, chemicals, and methods used for common tooth discolorations. J Esthet Dent. 1992; 4: 71-8.
Leonard RH Jr, Austin SM, Haywood VB, Bentley CD. Change in pH plaque and 10% carbamide peroxide solution during nightguard vital bleaching treatment. Quintessence Int. 1994; 25: 819-23.
Ernst C, Marroquin BB, Willershausen-Zonnchen B. Effects of hydrogen peroxide-containing bleaching agents on the morphology of human enamel. Quintessence Int. 1996; 27: 53-6.
Rotstein I, Dankner E, Goldman A, Heling I, Stabholz A, Zalkind M. Histochemical analysis of dental hard tissues following bleaching. J Endond. 1996; 22: 23-5.
Leonard RH Jr, Eagle JC, Garland GE, Matthews KP, Rudd AL, Phillips C. Nightguard vital bleaching and its effect on enamel surface morphology. J esthet Restor Dent. 2001; 13: 132-9.
Shannon H, Spencer P, Gross K, Tira D. Characterization of enamel exposed to 10% carbamide peroxide bleaching agents. Quintessence Int. 1993; 24: 39-44.
Murchison DR, Charlton DG, Moore BK. Carbamide peroxide bleaching: effects on enamel surface hardness and bonding. Oper Dent. 1992; 17: 181-5.
Nathoo SA, Chmielewski MB, Kirkup RE. Effects of Colgate Platinum professional tooth whitening system on microhardness of enamel, dentin, and composite resins. Compendium. 1994;15: S627-30.
Seghi RR, Denry I. Effects of external bleaching on indentation and abrasion characteristics of human enamel in vitro. J Dent Res. 1992; 71: 1340-4.
Marshall MV, Cancro LP, Fischman SL. Hydrogen peroxide: a review of its use in dentistry. J Periodontol. 1995; 66: 786-96.
Attin T, Kielbassa AM, Scwanenberg M, Heling E. Effect of fluoride treatment on remineralization of bleached enamel. J Oral Rehabil. 1997; 24: 282-6.
Akal N, Over H, Olmez A, Bodur H. Effects of carbamide peroxide containing bleaching agents on the morphology and subsurface hardness of enamel. J Clin Pediatr Dent. 2001; 25: 293-6.
Attin T, Vollmer D, Wiegand A, Attin R, Betke H. Subsurface microhardness of enamel and dentin after different external bleaching procedures. Am J Dent. 2005; 18: 8-12.
Lewinstein I, Fuhrer N, Churaru N, Cardash H. Effect of different peroxide bleaching regimes and subsequent fluoridation on the hardness of human enamel and dentin. J Prosthet Dent. 2004; 92: 337-42.
Zalkind M, Arwaz JR, Goldman A, Rotstein I. Surface morphology changes in human enamel, dentin and cementun following bleaching. A scanning electron microscopy study. Endodont Dent Traumatol. 1996; 12: 82-8.
Garone Netto N. Alternativas ao clareamento dental. In: Cardodo RJA, Gonçalves EAN. Estética. São Paulo: Artes Médicas; 2002. p.363-75.
Lopes GC, Bonissoni L, Baratieri LN, Vieira LC, Monteiro S Jr. Effect of bleaching agents on the hardness and morphology of enamel. J Esthet Restor Dent. 2002; 14: 24-30.
Araújo EM, Baratieri, LN, Vieira LC, Ritter AV. In situ effect of 10% carbamide peroxide on microhardness of human enamel: function of time. J Esthet Restor Dent. 2003; 15: 166-74.
Featherstone JD, ten Cate JM, Shariati M, Arends J. Comparison of artificial caries-like lesions by quantitative microradiography and microhardness profiles. Caries Res. 1983; 17: 385-91.
Leonard RH Jr, Bentley CD, Haywood VB. Salivary pH changes during 10% carbamide peroxide bleaching. Quintessence Int. 1994; 25: 547-50.
Haywood VB, Houck VM, Heyman HO. Nightguard vital bleaching: effects of various solutions on enamel surface texture and color. Quintessence Int. 1991; 22: 775-82.
Ben-Amar A, Liberman R, Gorfil C, Bernstein Y. Effect of mouthguard bleaching on enamel surface. Am J Dent. 1995; 8: 29-32.
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