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광중합형 복합레진의 중합 전, 후의 색 성분이 중합률과 굴곡강도에 미치는 영향

Effects of the color components of light-cured composite resin before and after polymerization on degree of conversion and flexural strength

조병훈|유지아
대한치과보존학회 (Korean Academy Of Conservative Dentistry)|2011.07|Restorative Dentistry and Endodontics|제36권 제4호|pp. 324-335

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Degree of conversion중합률Light-cured composite resinBiaxial flexural strengthaccepted 5 July 2011-광중합형 복합레진 색조2축 굴곡강도CIE Lab*Shade -Received 29 January 2011revised 8 March 2011
주제분류치의학

초록

연구목적: 복합레진의 색조를 색 성분요소인 CIE Lab* 각 성분요소로 측정하고, 동일 시편에 대해서 중합률과 2축 굴곡강도(biaxial flexural strength)를 측정하여 이들의 상관관계를 비교함으로써 복합레진의 중합전,후의 색 성분요소가 중합률과 물성에 미치는 영향을 알아보고자 하였다. 연구 재료 및 방법: 두 종류의 복합레진 Premisa (Kerr Co.)와 Denfil (Vericom Co)의 법랑질 색조(A1, A2, A3, A4)와상아질 색조(A2O, A3O)에 대해 원판형의 시편을 제작하여 색성분, 중합률 및 2축 굴곡강도를 측정하였다. 분광광도계를 이용하여 중합 전, 후 및 7일에 CIE L*, a*, b* 값을 측정하고, 같은 시편에 대해 근적외선분광기를 이용하여 중합 후 2시간과7일에 중합률을 측정하였다. 중합 7일 후에 색 성분과 중합률을 측정한 후 만능시험기에서 2축 굴곡강도를 측정하였다. 색요소인 CIE L*, a*, b* 각각의 값과 중합률, 및 2축 굴곡강도의 상관관계를 분석하였다. 결과: 두 종의 광중합형 복합레진은 중합 전과 후에 색 성분요소, 즉 색조의 변화가 있었고, 광중합 후에도 시간이 경과하면서 중합률이 증가되었다. 중합률은 제품, 기간, 및 색조의 영향을 받고(3-way ANOVA, p < 0.05), 굴곡강도는 제품 및 색조의 영향을 받았다(2-way ANOVA, p < 0.05). 중합률은 Premisa 한 제품에서만 중합 전,후의 CIE a* component와 유의한 상관관계를 보였고, 굴곡강도도 Premisa에서 CIE a* 및 CIE b* component와 음의 상관관계를 보였다(Pearson product moment correlation, p < 0.05). 결론: 광중합 복합레진의 중합률과 굴곡강도는 제품의 중합 전,후의 색 성분에 의해 영향을 받았다.

Abstract

Objectives: This study investigated the effects of the color components of light-cured composite resin before and after polymerization on degree of conversion (DC) and biaxial flexural strength (FS). Materials and Methods: Four enamel shades (A1, A2, A3, A4) and two dentin shades (A2O, A3O) of Premisa (Kerr Co.) and Denfil (Vericom Co.) were evaluated on their CIE L*, a*, b* color components using the spectrophotometer before curing, after curing and at 7 day. The DC of same specimens were measured with Near-infrared spectrometer (Nexus, Thermo Nicolet Co.) at 2 hr after cure and at 7 day. Finally, the FS was obtained after all the other measurements were completed at 7 day. The correlations between each color component and DC and FS were evaluated. Results: The light-curing of composite resin resulted in color changes of Premisa in red-blue direction and Denfil in green-blue direction. The DC and FS were affected by product, time and shade (3-way ANOVA,p < 0.05) and product and shade (2-way ANOVA, p < 0.05), respectively. Premisa only showed a significant correlation between the DC and CIE a* component - before and after polymerization (Pearson product moment correlation, p < 0.05). The FS of Premisa showed significant negative correlations with CIE a* and CIE b* components. Conclusions: The DC and FS of the light-curing composite resin were affected by the color components of the material before and after polymerization. [J Kor Acad Cons Dent 2011;36(4):324-335.]

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