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KMID : 0361920110410020121
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Korean Journal of Orthodontics
2011 Volume.41 No. 2 p.121 ~ p.126
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Effects of a new desensitizing paste containing 8% arginine and calcium carbonate on the shear bond strength of orthodontic brackets
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Ahmet Yagci
Tancan Uysal
Hatice Akinci
Banu Uysal
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Abstract
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Objective : The purpose of this study was to evaluate shear bond strength (SBS) and failure site location of brackets bonded to enamel with or without desensitizer application.
Methods: Sixty-six freshly extracted human premolar teeth were randomly divided into 3 groups of 22. Group 1 served as the control. Desensitizer was applied to the remaining teeth at two time intervals (Group 2, bonded immediately after Pro-ReliefTM (Colgate-Palmolive Co., New York, NY, USA) application and Group 3, bonded 30 days after Pro-ReliefTM application with the teeth stored in artificial saliva during the 30 days). Orthodontic brackets were bonded with a light cure composite resin and cured with a halogen light. After bonding, the SBS of the brackets was tested using a universal testing device. Adhesive remnant index (ARI) scores were determined after the brackets failed. Data were analyzed with analysis of variance, Tukey’s HSD, and G tests.
Results: The SBS was significantly lower in Group 2 than in Groups 1 (p = 0.024) and 3 (p = 0.017). Groups 1 and Group 3 did not differ (p = 0.991). ARI scores did not differ significantly among groups.
Conclusions : The Pro-ReliefTM desensitizer agent applied immediately before bonding significantly reduces bond strength, but the SBS values still exceed the minimum 5.9 - 7.8 MPa required for adequate clinical performance. Immersing the teeth in artificial saliva for 30 days after applying the Pro-ReliefTM desensitizer agent and before bonding increased the SBS to control levels.
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KEYWORD
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Dentin desensitizing agents, Orthodontic brackets, Shear strength
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