Effects of Different Bleaching Agents on Micro-Hardness and Color Changes in Human Enamel
Journal Title: IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) - Year 2017, Vol 17, Issue 2
Abstract
Objectives: This single-blind in-vitro study was conducted to assess the effect of different in-office and home bleaching agents on the micro-hardness and color changes of dental enamel. Materials and Methods:Twenty human premolar teeth extracted for orthodontic reasons were used in the study. After mounting, an area of 2 mm circumference was chosen in the mid buccal section of all premolars for bleaching-agent application. The specimens were divided into four (4) groups. Each group was exposed to a specific bleaching material according to its manufacturer’s instructions. (GI) Control group; no treatment, teeth were immersed in artificial saliva, (GII) Fläsh, (32% hydrogen peroxide), (GIII) Opalescence Xtra Boost (40% hydrogen peroxide) and (GIV) Opalescence Home (35% carbamide peroxide). Micro-hardness and color changes were recorded for each specimen before and 24-hrs after the application of bleaching materials using Vickers Microhardness Test Machine and a Knoop diamond with 50g load applied for 10s and ColoreyeSpectro-Photometer, respectively. The value deltaE(ab)*=3.3 was used as an acceptable value in subjective visual evaluations. Statistical analysis of data was done using One-Way ANOVA and Tukey’srange test, with significance level set at 5%. Results: Micro-hardness testing showed that while there was an increase in micro-hardness after use of Opalescence Home (GIV), there was a general tendency towards decreased micro-hardness with the other bleaching groups (GII) and (GIII). However, due to small sample size the difference was not statistically significant. Substantial color differences were noticed in readings of deltaE for groups subjected to bleaching. Conclusion: It can be concluded that using different bleaching agents can affect enamel micro-hardness and color. However, this was only a pilot study and more detailed results will be outlined once complete number of specimens is examined. Further studies with different materials are necessary to conclude a significant relation.
Authors and Affiliations
Wadha Al-Headhal, Nuha Al-Shammari
Keywords
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- EP ID EP362450
- DOI 10.9790/0853-1702077578
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