Invitro Comparison Between the Effects of Two Tooth Bleaching Agents on Surface Micro Hardness of Microhybrid Composite

Khamverdi, Zahra and Kasraee, Shahin (2007) Invitro Comparison Between the Effects of Two Tooth Bleaching Agents on Surface Micro Hardness of Microhybrid Composite. Journal of Mashhad Dental School, 31 (Issue). pp. 37-46.

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Abstract

Introduction: Tooth whitening products may have effects on various properties of restorative materials including hardness. This study investigated the effects of two at-home bleaching agents (Kimia 16%, Opalescence PF 15%) on hardness of a microhybrid composite. Materials & Methods: Thirty cylindrical-shaped specimens of microhybrid composite Z250 (3M, Dental Products, USA) with 5mm diameter and 2mm height were prepared and divided into three treatment groups comprising a control and two different bleaching groups. Control specimens were stored in distilled water for two weeks. Specimens of bleaching groups were exposed to the bleaching agents (Kimia 16% the first bleaching group and opalescence 15% for the second group) 1 hour daily for 2 weeks. After treatment, the hardness of specimens was tested using Vickers-test Instrument under 300 gr load for 15 seconds. The data were analyzed using One-way ANOVA and Tukey tests (α=0.05). Results: The mean composite microhardness for control, Kimia and Opalescence groups were 97.93±4.59, 95.56±2.75 and 86.57±2.59 respectively. It was observed that the bleaching materials softened the composite Z250. However, ANOVA showed the difference between Kimia group and control group was not significant (P=0.280)). Hardness of Opalescence group was significantly lower than the two other groups (P=0.000). Conclusion: Regarding the decreased microhardness of microhybrid composite, Kimia 16% at-home bleaching agent is more desirable than Opalescence PF 15%. Key words: Microhardness, composite, dental bleaching.

Item Type: Article
Subjects: WU Dentistry. Oral surgery
Divisions: Journals > Journal of Mashhad Dental School
Depositing User: jmds jmds
Date Deposited: 24 Sep 2017 15:26
Last Modified: 24 Sep 2017 15:26
URI: http://eprints.mums.ac.ir/id/eprint/3488

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