Assessment of Color Changes and Color Rebounds in Enamel, Dentin-enamel junction, and Dentine during Vital Bleaching

doi:10.13701/j.cnki.kqyxyj.2020.08.019

Abstract

Abstract: Objective: To investigate the changes of color and color rebounds in the enamel, dentine, and DEJ following 14 days vital bleaching treatment and to determine the mechanism of vital tooth bleaching. Methods: 12 extracted premolars were sectioned bucco-lingually in half and randomly bleached with 10% carbamide peroxide (CP) (group A) or 38% hydrogen peroxide (HP) (group B) for 14 days with two bleaching techniques. Photographs were taken prior to bleaching, day 3, 7, and 14 during bleaching, and day 3, 7, 14, 21, 28, and 35 after bleaching in group A; and day 1, 7, and 14 during bleaching, and day 3, 7, 14, 21, 28, and 35 after bleaching in group B. All photographs were digitized, calibrated, and converted to L^*, a^*, b^* values and analyzed using repeated measures analysis of variance. Results: On day 14 , the ΔE of enamel and DEJ were significantly higher than that of dentine in group A and B(P＜0.01). The ΔL^* of DEJ was significantly higher than that of dentine, while the Δb^* was opposite(P＜0.05). In group A, 5 weeks after bleaching, the ΔE and ΔL^* of enamel and DEJ were significantly higher than that of dentine, while the Δb* was opposite (P＜0.01). In group B, 2 to 5weeks after bleaching, Δb^* of enamel was significantly lower than that of dentine, and ΔE of enamel and DEJ were significantly higher than that of dentine (P＜0.05). With respect to Δa*, only small changes amounting to 0.67 to 2.44 could be observed after bleaching treatment in all specimens. The color relapse rate (CRR) of enamel, dentine, and DEJ were all more than 30% in 5 weeks after bleaching. On day 14 , ΔL^* of enamel in group A was significantly higher than group B(P＜0.01). ΔL^* of dentine in group B was significantly higher than group A, while Δb^* was opposite(P＜0.05)in 5 weeks after bleaching. Conclusion: The color changes in enamel and DEJ might have a certain contribution to that of tooth color during tooth bleaching, while the color changes in dentine might play a small role in the color changes of the whole tooth.

Key words: digital imaging, bleaching, enamel, dentine, dentin-enamel junction (DEJ)

SU Weizhu, WANG Yining, MA Xiao. Assessment of Color Changes and Color Rebounds in Enamel, Dentin-enamel junction, and Dentine during Vital Bleaching[J]. Journal of Oral Science Research, 2020, 36(8): 786-792.

References

[1] Haywood VB, Heymann HO. Nightguard vital bleaching [J]. Quintessence Int, 1989, 20(3):173-176.
[2] Ermis RB, Uzer Celik E, Yildiz G, et al. Effect of tooth discolouration severity on the efficacy and colour stability of two different trayless at-home bleaching systems [J]. J Dent Res Dent Clin Dent Prospects, 2018, 12(2):120-127.
[3] Alaghehmand H, Rohaninasab M, Bijani A. The effect of office bleaching on the color and bond strength of resin restorations [J]. Dent Res J (Isfahan),2019,16(1):47-52.
[4] 陈彦凝,于皓.激光牙齿漂白副作用的研究进展[J].口腔医学研究,2017,33(2):225-227.
[5] Sulieman M, Addy M, Macdonald E, et al. The bleaching depth of a 35% hydrogen peroxide based in-office product: a study in vitro [J]. J Dent, 2005, 33(1):33-40.
[6] Cavalli V, Silva BGD, Berger SB, et al.Decomposition rate, pH, and enamel color alteration of at-home and in-Office bleaching agents [J]. Braz Dent J, 2019, 30(4):385-396.
[7] Imbeni V, Kruzic JJ, Marshall GW, et al.The dentin-enamel junction and the fracture of human teeth [J]. Nat Mater, 2005, 4(3):229-232.
[8] Gallagher RR, Demos SG, Balooch M, et al. Optical spectroscopy and imaging of the dentin-enamel junction in human third molars [J]. J Biomed Mater Res A, 2003, 64(2):372-377.
[9] Vieira GF, Arakaki Y, Caneppele TM. Spectrophotometric assessment of the effects of 10% carbamide peroxid on enamel translucency [J]. Braz Oral Res, 2008, 22(1):90-95.
[10] Leonard RH Jr. Nightguard vital bleaching: dark stains and long-term results [J]. Compend Contin Educ Dent Suppl, 2000, (28):S18-S27.
[11] Haywood VB. Achieving, maintaining, and recovering successful tooth bleaching [J]. J Esthet Dent, 1996, 8(1):31-38.
[12] Matis BA, Cochran MA, Franco M, et al. Eight in-office tooth whitening systems evaluated in vivo: A pilot study [J]. Oper Dent, 2007, 32:322-327.
[13] Li Q, Xu BT, Li R, et al. Quantitative evaluation of colour regression and mineral content change of bleached teeth [J]. J Dent, 2010, 38(3): 253-260.
[14] Epple M, Meyer F, Enax J. A Critical review of modern concepts for teeth whitening [J]. Dent J (Basel),2019,7(3):79.
[15] Pan Q, Westland S. Tooth color and whitening-digital technologies [J]. J Dent, 2018, 74:S42-S46.
[16] Joiner A, Luo W. Tooth colour and whiteness: A review [J]. J Dent, 2017, 67S:S3-S10.
[17] Luo W, Naeeni M, Platten S, et al.The in vitro and in vivo reproducibility of a video-based digital imaging system for tooth colour measurement [J]. J Dent, 2017, 67S:S15-S19.
[18] O'Brien WJ, Groh CL, Boenke KM. A new, small-color-difference equation for dental shades [J]. J Dent Res, 1990, 69(11):1762-1764.
[19] Mounika A, Mandava J, Roopesh B, et al. evaluation of color change and tooth sensitivity with in-office and home bleaching treatments [J]. J Dent Res, 2018, 29(4):423-427.
[20] Machado LS, Anchieta RB, dos Santos PH, et al. Clinical comparison of at-home and in-office dental bleaching procedures: A randomized trial of a split-mouth design [J]Int J Periodontics Restorative Dent, 2016, 36:251-260.
[21] Rodrigues JL, Rocha PS, Pardim SLS, et al. Association between in-office and at-home tooth bleaching: a single blind randomized clinical trial [J]. Braz Dent J, 2018, 29(2):133-139.
[22] Ma X, Jiang T, Sun L, et al. Effects of tooth bleaching on the color and translucency properties of enamel [J]. Am J Dent, 2009, 22(6):324-328.
[23] Morita W, Yano W, Nagaoka T, et al. Patterns of morphological variation in enamel-dentin junction and outer enamel surface of human molars [J]. J Anat, 2014, 224(6):669-680.
[24] Bersezio C, Ledezma P, Estay J, et al. Color regression and maintenance effect of intracoronal whitening on the quality of life: RCT-A one-year follow-up study [J]. Oper Dent, 2019, 44(1):24-33.
[25] Bersezio C, Martín J, Prieto MV, et al. One-year bleaching efficacy using two HP products with different pH: A double-blind randomized clinical trial [J]. J Esthet Restor Dent, 2019, 31(5):493-499.
[26] Moghadam FV, Majidinia S, Chasteen J, et al. The degree of color change, rebound effect and sensitivity of bleached teeth associated with at-home and power bleaching techniques: A randomized clinical trial [J]. Eur J Dent, 2013, 7(4):405-411.
[27] Wiegand A, Drebenstedt S, Roos M, et al. 12-month color stability of enamel, dentine, and enamel-dentine samples after bleaching [J]. Clin Oral Investig, 2008, 12(4):303-310.