Shear bond strength of ceramic brackets bonded with antimicrobial monomer-containing self-etching primer

Tae-Hun Kwon; Jang-Mi Kang; Na-Young Chang; Kyung-Hwa Kang

doi:10.4041/kjod.2011.41.1.16

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Kwon, Kang, Chang, and Kang: Shear bond strength of ceramic brackets bonded with antimicrobial monomer-containing self-etching primer

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2011; 41(1): 16-24.

Published online: 28 February 2011

DOI: https://doi.org/10.4041/kjod.2011.41.1.16

Shear bond strength of ceramic brackets bonded with antimicrobial monomer-containing self-etching primer

Tae-Hun Kwon, DDS, MSD^a, Jang-Mi Kang, DDS, MSD^a, Na-Young Chang, DDS, MSD^b, Kyung-Hwa Kang, DDS, MSD, PhD^c

^aGraduate Student, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.

^bAssistance Professor, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.

^cAssociate Professor, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.

Corresponding author: Kyung-Hwa Kang. Department of Orthodontics, School of Dentistry, Wonkwang University, 344-2 Shinyong-dong, Iksan 570-749, Korea. +82 63 850 6635; pigtail@wonkwang.ac.kr

Received 4 March 2010 Revised 12 July 2010 Accepted 16 July 2010

Abstract

Objective

The purpose of this study was to determine (1) the shear bond strength (SBS) of an antimicrobial monomer-containing self-etching primer according to ceramic bracket types and (2) the bracket-adhesive failure mode using an adhesive remnant index (ARI).

Methods

A total of 90 extracted human teeth were randomly divided into 6 groups. Each group consisted of one of two ceramic brackets (monocrystalline, polycrystalline) and one of three primers (Transbond XT primer, Transbond Plus SEP, Clearfil Protect Bond) with each group containing 15 specimens. The SBS was measured, and adhesive residues left on the tooth surface were assessed.

Results

The SBS of polycrystalline ceramic bracket groups was significantly higher than that of the monocrystalline ceramic bracket groups (p < 0.001). The SBS of Transbond XT primer groups was significantly higher than those of Transbond Plus SEP groups and Clearfil Protect Bond groups (p < 0.001). All the groups showed bonding failures between the bracket base and adhesive.

Conclusions

The combination of a self-etching primer with a monocrystalline bracket is recommended for clinical use, considering its acceptable SBS and mode of failure.

Keywords: Shear bond strength, Antimicrobial monomer-containing self-etching primer, Ceramic bracket, Bracket-adhesive failure

Figures and Tables

Fig. 1

Experimental set-up for shear bond strength measurement.

Table 1

Materials used in the study

Bis-GMA, Bisphenol A diglycidyl ether dimethacrylate; MDP, 10-methacryloxydecyl dihydrogen phosphate; MDPB, 12-methacryloyloxydodecyl pyridinium bromide; HEMA, hydroxylethyl methacrylate.

Table 2

Experimental groups

Mono, Monocrystalline bracket; Poly, polycrystalline bracket; XT, transbond XT primer; SEP, transbond plus self etching primer; Protect, clearfil protect bond.

Table 3

Comparison of shear bond strength values (MPa) according to bracket types

Mono, Monocrystalline bracket; Poly, polycrystalline bracket; XT, transbond XT primer; SEP, transbond plus self etching primer; Protect, clearfil protect bond; SD, standard deviation. ^*p < 0.001.

Table 4

Comparison of shear bond strength values (MPa) according to primer types

Mono, Monocrystalline bracket; Poly, polycrystalline bracket; XT, transbond XT primer; SEP, transbond plus self etching primer; Protect, clearfil protect bond; SD, standard deviation. Groups with the same letters are not significantly different from each other at the level of p < 0.001 (a < b). ^*p < 0.001.

Table 5

Frequency distribution of the adhesive remnant index (ARI) scores

Mono, Monocrystalline bracket; Poly, polycrystalline bracket; XT, transbond XT primer; SEP, transbond plus self etching primer; Protect, clearfil protect bond. ^*ARI scores: 1, All of the adhesive remains on the tooth; 2, more than 90% of the adhesive remains on the tooth; 3, more than 10% but less than 90% of the adhesive remains on the tooth; 4, less than 10% of the adhesive remains on the tooth; 5, no adhesive remains on the tooth.

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