레이저 처리가 상아질과 복합 레진의 결합에 미치는 영향
Effects of laser-irradiated dentin on shear bond strength of composite resin
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목적: 이 연구는 산부식 대신 레이저로 표면처리를 하였을 때 복합레진과의 전단결합강도에 어떤 영향을 주는지 알아보기 위해 시행되었다. 재료 및 방법: 치아 우식증이 전혀 없는 건전한 최근에 발치된 대구치를 레진으로 매몰하고 상아질을 노출시킨 뒤 표면연마를 시행하였다. 치아는 10개씩 4그룹으로 나누었다. 1) 아무 처리도 하지 않은 군, 2) 35% 인산으로 산부식한 군, 3) Er:YAG laser 레이저 처리된 군, 4) Er,Cr:YSGG laser로 처리된 군. 시편에 상아질 접착제 Single Bond2 (3M/ESPE)를 도포하고, 직경 3 mm, 높이 3 mm의 투명한 플라스틱 관을 치아면 위에 두고 복합레진을 축성하였다. 모든 시편은 24시간동안 37℃증류수에 보관 후 만능시험기를 이용하여 전단결합강도를 측정하였다. 결과: 레이저 처리시 각각 Er:YAG 레이저 처리는 3.98 ± 0.88 MPa, Er,Cr:YSGG 레이저 처리는 3.70 ± 1.55 MPa의 결합강도를 보였고, 통계적으로 유의한 차이를 나타내지 않았다. 아무 처리도 하지 않은 군의 결합강도는 1.52 ± 0.42 MPa로 가장 낮은 결합강도를 나타내었고, 산처리를 한 군이 7.10 ± 1.86 MPa로 가장 높은 전단결합강도를 보였으며, 이들은 레이저 처리한 군과 비교시 통계적으로 P < .001 유의수준에서 유의한 차이가 있는 것으로 나타났다. 결론: 치아와 레진의 전단결합강도 비교시 레이저 처리는 아무 처리도 않은 군에 비해서는 높지만 인산 etching보다 그 결합력이 떨어진다.
Abstract
Purpose: This study was conducted to evaluate the shear bond strength of composite resin to dentin when etched with laser instead of phosphoric acid. Material and methods: Recently extracted forty molars, completely free of dental caries, were embedded into acrylic resin. After exposing dentin with diamond saw, teeth surface were polished with a series of SiC paper. The teeth were divided into four groups composed of 10 specimens each; 1) no surface treated group as a control 2) acid-etched with 35%-phosphoric acid 3) Er:YAG laser treated 4) Er,Cr:YSGG laser treated. A dentin bonding agent (Adapter Single Bond2, 3M/ESPE) was applied to the specimens and then transparent plastic tubes (3 mm of height and diameter) were placed on each dentin. The composite resin was inserted into the tubes and cured. All the specimens were stored in distilled water at 37℃ for 24 hours and the shear bond strength was measured using a universal testing machine (Z020, Zwick, Germany). The data of tensile bond strength were statistically analyzed by one-way ANOVA and Duncan’s test at α = 0.05. Results: The bond strengths of Er:YAG laser-treated group was 3.98 ± 0.88 MPa and Er,Cr:YSGG laser-treated group showed 3.70 ± 1.55 MPa. There were no significant differences between two laser groups. The control group showed the lowest bond strength, 1.52 ± 0.42 MPa and the highest shear bond strength was presented in acid-etched group, 7.10 ± 1.86 MPa (P < .05). Conclusion: Laser-etched group exhibited significantly higer bond strength than that of control group, while still weaker than that of the phosphoric acid-etched group.
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