J Korean Acad Conserv Dent.  2005 May;30(3):178-183. 10.5395/JKACD.2005.30.3.178.

The influence of the vital bleaching agents on translucency of the bovine enamel

• Kim DJ
• Kim YJ
• Kim HG
• Park EJ
• Seo EJ
• Hwang YC
• Oh WM
• Hwang IN

• KMID: 2045243
• DOI: http://doi.org/10.5395/JKACD.2005.30.3.178

Abstract

This study was done to evaluate whether vital bleaching agents could influence on the translucency of the bovine enamel. The anterior bovine teeth that were extracted one day before and without any gross discoloration were obtained and then were preserved in physiologic saline. 6 mm cylindrical tooth specimens were fabricated with diamond puncher perpendicularly on labial surface of bovine tooth. After embedded in transparent acrylic resin with labial surface being exposed, they were cut to a thickness of 1.2 mm with low speed diamond saw (Isomat, Buehler Co., Lake Bluff, IL, USA). They were smoothly ground to 1 mm thickness of enamel with sandpaper. 24 specimens were randomly divided into 3 groups and control group respectively. Opalescence (10% carbamide peroxide, Ultradent, South Jordan, USA), Rembrandt (10% carbamide peroxide, DenMat, USA) and Opalescence F (15% carbamide peroxide with fluoride, Ultradent, USA) were applied on labial sides of the bovine enamel for 7 days (bleaching agents were reapplied every 24 hours) and the opposite surface was contacted to cotton that soaked in distilled water. The control group was soaked in distilled water. Three stimulus value X, Y and Z were evaluated with colorimeter (Color & Color Differencemeter, Model TC-6FX, Tokyo Denshoku Co., Japan) on the labial surface of all specimen three times on white and black background plate before the bleaching agents were applied and on 3rd, 5th and 7th day after applied. The degree of translucency was normally assessed by measuring the inverse property, opacity (contrast ratio). 10% Opalescence, 15% Opalescence-F, and control group showed no significant variation in the translucency of bovine enamel, However Rembrandt decreased the translucency of it (p < 0.01).

Keyword

Color of bovine enamel; Enamel translucency; Contrast ratio; Vital bleaching

MeSH Terms

Bleaching Agents*
Dental Enamel*
Diamond
Fluorides
Jordan
Lakes
Tooth
Urea
Water
Bleaching Agents
Diamond
Fluorides
Urea
Water

Figure

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  Figure 1 Change of contrast ratio in bovine teeth.

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  Figure 2 Change of L*value in bovine teeth.

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  Figure 3 Change of a*value in bovine teeth.

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  Figure 4 Change of b*value in bovine teeth.

Reference

1. Chapple JA. Restoring discolored teeth to normal. Dent Cosmos. 1877. 19:449.

2. Haywood VB, Heymann HO. Nightguard vital bleaching. Quintessence Int. 1989. 20:173–176.

3. Haywood VB. History, safety, and effectiveness of current techniques and applications of the nightguard vital bleaching technique. Quintessence Int. 1992. 23:471–488.

4. Leonard RH, Sharma A, Haywood VB. Use of different concentrations of carbamide peroxide for bleaching teeth: An in vitro study. Quintessence Int. 1998. 29:503–507.

5. Haywood VB, Leech T, Heymann HO, Crumpler D, Bruggers K. Nightguard vital bleaching effect on enamel surface texture and diffusion. Quintessence Int. 1990. 21:801–804.

6. Hunsaker KJ, Christen GJ, Christensen RP. Tooth bleaching chemicals' influence on teeth and restoration. J Dent Res. 1999. 69:303.

7. White DJ, Kozak KM, Zoladz JR, Duschner HJ, Gotz H. Effects of tooth whitening gels on enamel and dentin ultrastructure: a confocal laser scanning microscopy pilot study. Compend Contin Educ Dent Suppl. 2000. 29:S29–S34.

8. 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(1):24–30.

9. Bitter NC. A scanning electron microscopy study of the effect of bleaching agents on enamel: A preliminary report. J Prosthet Dent. 1992. 67(6):852–855.

10. Potocnik I, Kosec L, Gaspersic D. Effect of 10% carbamide peroxide bleaching gel on enamel microhardness, microstructure, and mineral content. J Endod. 2000. 26:203–206.

11. McGuckin RS, Babin JF, Meyer BJ. Alternation in human enamel surface morphology following vital bleaching. J Prosthet Dent. 1992. 68:754–760.

12. Crisp S, Abel G, Wilson AD. The quantitative measurement of the opacity of aesthetic dental filling materials. J Dent Res. 1979. 58(6):1585–1596.

13. Matis BA, Mousa HN, Cochran MA, Eckert GJ. Clinical evaluation of bleaching agents of different concentrations. Quintessence Int. 2000. 31:303–310.

14. Perdigao J, Francci C, Swift EJ Jr, Ambrose WW, Lopez M. Ultra-morphological study of the interaction of dental adhesives with carbamide peroxide-bleached enamel. Am J Dent. 1998. 11:291–301.

15. Bitter NC. A scanning electron microscopy study of the effect of bleaching agents on enamel: [a preliminary report]. J Prosthet Dent. 1992. 67:852–855.

16. McCracken MS, Haywood VB. Demineralization effects of 10 percent carbamide peroxide. J Dent. 1996. 24:395–398.

17. Shannon H, Spencer P, Gross K, Tira D. Characterization of enamel exposed to 10% carbamide peroxide bleaching agents. Quintessence Int. 1993. 24:39–44.

18. Murchison DF, Charlton DG, Moore BK. Carbamide peroxide bleaching: effects on enamel surface hardness and bonding. Oper Dent. 1992. 17:181–185.

19. Nathoo SA, Chmielewski MB, Kirkup RE. Effects of colgate platinum professional tooth whitening system on microhardness of enamel, dentin, and composite resins. Compend Suppl. 1994. (17):S627–S630.

20. Seghi RR, Denry I. Effects of external bleaching on indentation and abrasion characteristics of human enamel in vitro. J Dent Res. 1992. 71:1340–1344.

21. Smidt A, Weller D, Roman I, Gedalia I. Effect of bleaching agents on microhardness and surface morphology of tooth enamel. Am J Dent. 1998. 11:83–85.

22. Kihn P, Barnes D, Romberg E, Mohammad M. Clinical evaluation of 10% vs 15% carbamide peroxide whitening system [abstract 998]. J Dent Res. 1999. 78:230.