Shear bond strength between gold alloy and orthodontic metal bracket using light emitting diode curing light

Min-Ho Jung; Shin-Hye Chung; Won-Jun Shon

doi:10.4041/kjod.2010.40.1.27

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Jung, Chung, and Shon: Shear bond strength between gold alloy and orthodontic metal bracket using light emitting diode curing light

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2010; 40(1): 27-33.

Published online: 28 February 2010

DOI: https://doi.org/10.4041/kjod.2010.40.1.27

Shear bond strength between gold alloy and orthodontic metal bracket using light emitting diode curing light

Min-Ho Jung, DDS, MSD, PhD^a, Shin-Hye Chung, DDS^b, Won-Jun Shon, DDS, MSD, PhD^c

^aPrivate Practice; Clinical Assistant Professor, Department of Orthodontics, School of Dentistry, Seoul National University; Clinical Associate Professor, Samsung Medical Dental Center, Korea.

^bPostgraduate Student, Department of Conservative Dentistry, Seoul National University, Korea.

^cAssistant Professor, Department of Conservative Dentistry, Seoul National University, Korea.

Corresponding author: Won-Jun Shon. Department of Conservative Dentistry, Seoul National University, 28, Yeongeon-dong, Jongno-gu, Seoul 110-744, Korea. +82 2 2072 2651; endoson@snu.ac.kr

Received 14 September 2009 Revised 22 January 2010 Accepted 26 January 2010

Abstract

Objective

The need to bond orthodontic brackets onto various alloys has increased because of the increasing demand for adult orthodontic treatment. This study tried to evaluate the shear bond strength between gold alloy and metal bracket using light emitting diode (LED) light curing after metal primer and silicoating surface conditioning.

Methods

Half of the type III gold alloy plates were treated with sandblasting with aluminum oxide and metal primer containing 4-META, the other half were treated with silica and silane. Metal brackets were bonded with Transbond XT light curing adhesive on these plates and shear bond strength were evaluated 1 hour, 6 hours, and 24 hours later. The differences of shear bond strength between groups were evaluated with two-way ANOVA.

Results

The results showed higher bond strength in the silicoating group and a tendency of bond strength increase over time.

Conclusions

When using LED curing lights for metal bracket bonding to alloy surfaces, long curing time and silicoating can produce a reliable bonding strength.

Keywords: Alloy surface, Shear bond strength, Metal primer, Silicoating

Figures and Tables

Fig 1

Alloy plates were embedded in cold curing acrylic and placed in acrylic rings. Each plate was oriented so that its surface would be parallel to the force during the shear bond test.

Table 1

Alloy surface-conditioning methods and test timing of each group

Table 2

Mean and standard deviation in shear bond strength of each group

MPa, Megapascal. The same letters are not statistically significant at α = 0.05 by Scheffe's multiple comparison.

Table 3

Frequency and percentage distribution of the ARI scores of the 6 groups

^*ARI scores: 0, No adhesive left on the specimen; 1, less than half of the adhesive left on the specimen; 2, more than half of the adhesive left on the specimen; 3, all adhesive left on the specimen.

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