Influence of the curing time for the adhesive on the oxygen-inhibited layer thickness and the shear bond strength to dentin
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광조사 시간이 접착제의 표면 미중합층의 두께와 전단접착강도에 미치는 영향에 관한 연구 최용훈1, 배지현1, 손호현1, 이인복1, 엄정문1, 김오영2, 김창근3, 조병훈1* 1서울대학교 치과대학 치과보존학 교실, 2단국대학교 고분자공학과, 3중앙대학교 화학공학과 본 연구는 광중합형 상아질 접착제에서 광조사 시간의 증가가 접착제 표면의 미중합층에 대한 영향과 그에 따른 전단접착강도에 대해 연구하고자 120개의 치아를 아크릴 몰드에 식립한 후 상아질이 노출되도록 연마하였다. 3 종류의 접착제 [All Bond2(AB2), One-Step(OS) and Adper Prompt(AP)]를 40개 치아에 제조사의 지시대로 도포한 후 각각 다른 광조사 시간 (10, 20, 30 and 60 sec)동안 광조사 하고 복합레진을 접착한 24시간 후 전단접착강도를 측정하였다. 미중합층의 두께와 중합률은 슬라이드 글라스와 FT-NIR을 이용하여 FT-NIR spectrum에서의 peak height를 비교 측정하여 다음과 같은 결론을 얻었다. 1. 전단접착강도에서 AB2는 20초 이후 감소하고, AP는 30초까지 증가하였으며, OS 는 차이를 보이지 않았다. 2. 미중합층 두께는 3가지 접착제 모두 유의성 있는 차이를 보이지 않았다. 3. 중합률에서 OS는 10초와 나머지군 사이에 유의성 있는 차이를, AP는 60초에서 유의성 있게 증가되고, AB2의 경우 차이를 나타내지 않았다.
Abstract
This study investigated the hypothesis that increasing light-curing time would leave the oxygen-inhibited layer(OIL) of the adhesive thinner, and in turn, result in lower shear bond strength(SBS) than those obtained by the routine curing procedures. 120 human extracted posterior teeth were randomly divided into three groups for bonding with three adhesives: All Bond 2Ⓡ, One StepⓇ, and Adper PromptⓇ. They were subsequently divided into four subgourps with different light-curing time (10, 20, 30 and 60 s). The assigned adhesives were applied on superficial occlusal dentin according to the manufacturer's instructions and cured with one of the four curing times. Composite resin cylinder, 2.35 mm in diameter, were built on the cured adhesive and light-cured for 40s. SBS were measured after 24h from the bonding using a universal testing machine (crosshead speed 1.0mm/min). The relative thickness of the OIL and the degree of conversion(DC) were determined from the adhesive on a slide glass using FT-NIR in an absorbance mode. Data were analysed with One-way ANOVA and Duncan's multiple test (p < 0.05). With increasing cure time, although there were no significant difference in th SBS of One-step and Adper Prompt (p > 0.05), those of All Bond 2 decreased significantly (p < 0.05). The relative thicknesses of the OIL on each adhesive were not affected by the cure time (p > 0.05). Although the DC of All-Bond 2 were statistically not different with increasing cure time (p > 0.05), those of One-Step and Adper Prompt showed an increasing trends with increasing cure time (p < 0.05). Conclusions : Increasing light-curing time did not affect on the relative thickness of the OIL of the adhesives, and in turn, on the SBS to dentin.
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