RESEARCH ARTICLE
Effect of tooth whitening strips on fatigue resistance and flexural strength of bovine dentin in vitro Laura E. Tam*, Namhee Kim, Grace M. De Souza Restorative Dentistry, Department of Clinical Sciences, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
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* [email protected]
Abstract Objective
OPEN ACCESS Citation: Tam LE, Kim N, De Souza GM (2017) Effect of tooth whitening strips on fatigue resistance and flexural strength of bovine dentin in vitro. PLoS ONE 12(3): e0173480. doi:10.1371/ journal.pone.0173480 Editor: Binnaz Leblebicioglu, The Ohio State University, UNITED STATES Received: June 29, 2016 Accepted: February 21, 2017 Published: March 9, 2017 Copyright: © 2017 Tam et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Data Availability Statement: All relevant data are within the paper and its Supporting Information files. Funding: The study was supported by a Canadian Institute of Health Research Health Professional Summer Research Award, 2014/2015 (NK). The whitening strips were provided by Proctor & Gamble Incorporated. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing interests: The authors have declared that no competing interests exist.
To determine the effects of whitening strips on bovine dentin fatigue resistance and flexural strength in vitro.
Materials and methods A total of eighty bovine dentin specimens (2x2x17mm) were treated with either: control glycerine gel on plastic film wrap or whitening strips containing 9.5% hydrogen peroxide. Treatment was applied for 30 minutes, twice a day, for 1- or 4-weeks. After the last treatment, ten specimens per group were randomly selected to undergo fatigue testing (106 cycles, 3Hz, 20N) while the other ten were subjected to flexural strength testing after ten days of storage in artificial saliva. Kaplan-Meier method with a log rank test, Wilcoxon test and Cox regression were used to assess fatigue test results (p
Effect of tooth whitening strips on fatigue resistance and flexural strength of bovine dentin in vitro Laura E. Tam*, Namhee Kim, Grace M. De Souza Restorative Dentistry, Department of Clinical Sciences, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
a1111111111 a1111111111 a1111111111 a1111111111 a1111111111
* [email protected]
Abstract Objective
OPEN ACCESS Citation: Tam LE, Kim N, De Souza GM (2017) Effect of tooth whitening strips on fatigue resistance and flexural strength of bovine dentin in vitro. PLoS ONE 12(3): e0173480. doi:10.1371/ journal.pone.0173480 Editor: Binnaz Leblebicioglu, The Ohio State University, UNITED STATES Received: June 29, 2016 Accepted: February 21, 2017 Published: March 9, 2017 Copyright: © 2017 Tam et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Data Availability Statement: All relevant data are within the paper and its Supporting Information files. Funding: The study was supported by a Canadian Institute of Health Research Health Professional Summer Research Award, 2014/2015 (NK). The whitening strips were provided by Proctor & Gamble Incorporated. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing interests: The authors have declared that no competing interests exist.
To determine the effects of whitening strips on bovine dentin fatigue resistance and flexural strength in vitro.
Materials and methods A total of eighty bovine dentin specimens (2x2x17mm) were treated with either: control glycerine gel on plastic film wrap or whitening strips containing 9.5% hydrogen peroxide. Treatment was applied for 30 minutes, twice a day, for 1- or 4-weeks. After the last treatment, ten specimens per group were randomly selected to undergo fatigue testing (106 cycles, 3Hz, 20N) while the other ten were subjected to flexural strength testing after ten days of storage in artificial saliva. Kaplan-Meier method with a log rank test, Wilcoxon test and Cox regression were used to assess fatigue test results (p
