The effect of using laser for ceramic bracket bonding of porcelain surfaces

Kyung-Mi An; Dong-Seok Sohn

doi:10.4041/kjod.2008.38.4.275

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An and Sohn: The effect of using laser for ceramic bracket bonding of porcelain surfaces

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2008; 38(4): 275-282.

Published online: 31 August 2008

DOI: https://doi.org/10.4041/kjod.2008.38.4.275

The effect of using laser for ceramic bracket bonding of porcelain surfaces

Kyung-Mi An, DDS, MSD^a, Dong-Seok Sohn, DDS, MSD, PhD^b

^aFull-time lecturer, Department of Orthodontics, Daegu Catholic University Medical Center, Korea.

^bProfessor, Department of Dentistry, Daegu Catholic University Medical Center, Korea.

Corresponding author: Kyung-Mi An. Department of Orthodontics, Daegu Catholic University Medical Center, 3056-6, Daemyeong 4-dong, Nam-gu, Daegu 705-718, Korea. +82 53 650 4291; ajh0121@cu.ac.kr

Received 12 November 2007 Revised 22 May 2008 Accepted 25 May 2008

Abstract

Objective

The purpose of this study was to investigate the effect of using laser for ceramic bracket bonding of porcelain surfaces and to compare it with conventional treatment of porcelain surfaces.

Methods

Ninety feldspathic porcelain specimens were divided into 9 groups of 10, with each group having different surface treatments performed. Surface treatment groups were orthophosphoric acid, orthophosphoric acid with silane, hydrofluoric acid, hydrofluoric acid with silane, sandblasted, sandblasted with silane, laser etched, laser etched with silane, and glazed surface served as a control group. In the laser etched groups, the specimens were irradiated with 2-watt superpulse carbon dioxide (CO₂) laser for 20 seconds. Ceramic brackets were bonded with light-cure composite resin and all specimens were stored in water at 37℃ for 24 hours. Shear bond strength was determined in megapascals (MPa) by shear test at 1 mm/minute crosshead speed and the failure pattern was assessed. For statistical analysis, one-way ANOVA and tukey test were used.

Results

Statistical analysis showed significant differences between the groups. The HFA + S group showed the highest mean shear bond strength (13.92 ± 1.94 MPa). This was followed by SB + S (10.16 ± 1.27 MPa), HFA (10.09 ± 1.07 MPa), L + S (8.25 ± 1.24 MPa), L (7.86 ± 0.96 MPa), OFS + S (7.22 ± 1.09 MPa), SB (3.41 ± 0.37 MPa), OFA (2.81 ± 0.37 MPa), G (2,46 ± 1.36 MPa). Bond failure patterns of HFA and silane groups, except L + S, were cohesive modes in porcelain while adhesive failure was observed in the control group and the rest of the groups.

Conclusions

A 2-watt superpulse CO₂ laser etching of porcelain surfaces can provide a satisfactory result for porcelain surface treatment for ceramic bracket bonding. Laser irradiation may be an alternative conditioning method for the treatment of porcelain surfaces.

Keywords: CO₂ laser, Porcelain, Surface treatment, Shear bond strength

Figures and Tables

Fig 1

SEM photograghs of laser-treated porcelain surfaces. A, 10 W (X 200); B, 5 W (X 500); C, 3 W (X 500); D, 2 W (X 500).

Table 1

Measured values of shear bond strength of each group

OFA, orthophosphoric acid; SB, sandblasting; HFA, hydrofluoric acid; L, laser etch; C, control group (glazed surface); S, silane; SD, standard deviation.

Table 2

Bond failure patterns (unit: case)

OFA, orthophosphoric acid; SB, sandblasting; HFA, hydrofluoric acid; L, laser etch; C, control group (glazed surface); S, silane.

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