Korean J Orthod.  2011 Apr;41(2):121-126. 10.4041/kjod.2011.41.2.121.

Effects of a new desensitizing paste containing 8% arginine and calcium carbonate on the shear bond strength of orthodontic brackets

• Yagci A
• Uysal T
• Akinci H
• Uysal B

• KMID: 2274248
• DOI: http://doi.org/10.4041/kjod.2011.41.2.121

Abstract

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-Relief(TM) (Colgate-Palmolive Co., New York, NY, USA) application and Group 3, bonded 30 days after Pro-Relief(TM) 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-Relief(TM) 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-Relief(TM) desensitizer agent and before bonding increased the SBS to control levels.

Keyword

Dentin desensitizing agents; Orthodontic brackets; Shear strength

MeSH Terms

Adhesives
Arginine
Bicuspid
Calcium
Calcium Carbonate
Collodion
Dental Enamel
Dentin Desensitizing Agents
Humans
Light
New York
Orthodontic Brackets
Saliva, Artificial
Shear Strength
Tooth
Adhesives
Arginine
Calcium
Calcium Carbonate
Collodion
Dentin Desensitizing Agents
Saliva, Artificial

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