세라믹 브라켓 부착 시 레이저를 이용한 포세린 표면처리 효과
The effect of using laser for ceramic bracket bonding of porcelain surfaces
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본 연구는 포세린 표면에 CO2 레이저를 조사하여 세라믹 브라켓을 부착 후 전단결합강도를 측정하고, 산부식처리 및 샌드블라스트 등의 일반적인 방법을 시행하여 그 결과를 비교 분석하여 레이저 표면처리의 효과를 연구하고자 시행되었다. 90개의 포세린(8 × 8 × 4 mm) 시편을 제작하여 각각 10개씩 9개군으로 나누었다. 대조군(C)으로 아무런 표면처리를 하지 않은 글레이즈 표면을 사용하였으며, 실험군은 인산 처리군(OFA), 인산과 silane 처리군(OFA + S), 샌드블라스팅 처리군(SB), 샌드블라스팅과 silane 처리군(SB + S), 레이저 처리군(L), 레이저와 silane 처리군(L + S), 불산 처리군(HFA), 불산과 silane 처리군(HFA + S)으로 분류하였다. 만능시험기를 이용하여 전단결합강도를 측정하고 그 파절양상을 비교 분석한 결과 불산과 silane을 동시에 처리한 군에서 가장 높은 값(13.92 ± 1.92 MPa)을 보였으며, 측정값은 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), OFA + S (7.22 ± 1.09 MPa), SB (3.41 ± 0.37 MPa), OFA (2.81 ± 0.37 MPa), 대조군(2.46 ± 1.36 MPa) 순이었다. 브라켓 부착 시 치과용 레이저를 이용한 포세린의 표면처리 결과 전단결합강도의 값은 임상적으로 받아들여질 만한 수치를 보였으며 레이저와 silane을 동시에 처리한 군과는 통계적으로 유의할 만한 차이를 보이지 않았다(p ＞ 0.05). 이상의 연구결과는 포세린 표면에 세라믹 브라켓 부착 시 2-watt의 CO2 레이저를 사용하여 전처리를 하는 방법은 시간절약의 관점에서 임상적으로 표면 전처리의 적절한 치료 대안이 될 수 있음을 보여주었다. (대치교정지 2008;38(4):275-282)
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 37oC 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. (Korean J Orthod 2008;38(4):275-282)
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