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

Ahmet Yagci; Tancan Uysal; Hatice Akinci; Banu Uysal

doi:10.4041/kjod.2011.41.2.121

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

Original Article

Korean J Orthod 2011;41(2):121-126.

Published online: 21 January 2011

DOI: https://doi.org/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

Ahmet Yagci^a, Tancan Uysal^b, Hatice Akinci^c, Banu Uysal^d

DDS, PhD

DDS

^aAssistant Professor, Department of Orthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.

^bProfessor and Chair, Department of Orthodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey and Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.

^cResearch Assistant, Department of Orthodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.

^dResearch Assistant, Department of Restorative Dentistry and Endodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.

Corresponding author: Tancan Uysal. Erciyes Üniversitesi Dişhekimliği Fakültesi, Ortodonti A.D. Mel-ikgazi, Kampüs, Kayseri, 38039, Turkey. ＋905055719338; e-mail, tancanuysal@yahoo.com.

Received 24 September 201017 December 2010 Accepted 20 December 2020

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.

Keywords: Dentin desensitizing agents, Orthodontic brackets, Shear strength

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Table 1.

Descriptive statistics and the results of ANOVA comparing the SBS of the three groups tested

Group tested^a	Bond strength (Mpa)					ANOVA comparison	Tukey’s HSD
Group tested^a	N	Mean	Standard deviation	Minimum	Maximum	ANOVA comparison	Group 2	Group 3
1	22	17.9	5.4	8.2	26.9	p = 0.009 十	p = 0.024*	p = 0.991 NS
2	22	13.8	3.4	8.4	28.4			p = 0.017*
3	22	18.1	4.5	10.9	27.8

^a Group 1, Control Group 2, bonded immediately after desensitizer paste application Group 3, bonded 30 days after desensitizer paste application. NS, Not significant; SBS, shear bond strength. *p < 0.05; ^†p < 0.01.

Table 2.

Adhesive remnant index (ARI) scores (%)

Group tested^a	N	ARI score^b				G-Test
Group tested^a	N	0	1	2	3	G-Test
1	22	2 (9.1%)	9 (40.9%)	6 (27.3%)	5 (22.7%)	p = 0.9071, NS
2	22	2 (9.1%)	8 (36.4%)	1 (4.5%)	11 (50%)
3	22	2 (9.1%)	5 (22.7%)	6 (27.3%)	9 (40.9%)

^a Group 1, Control; Group 2, bonded immediately after desensitizer paste application; Group 3, bonded 30 days after desensitizer paste application.

^b ARI scores: Score 0, No adhesive remaining on the tooth; Score 1, less than half of the adhesive left on the tooth; Score 2, more than half of the adhesive left on the tooth; Score 3, all adhesive left on the tooth with a distinct impression of the bracket mesh. NS, Not significant.

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