레진 모노머의 중합전환률 증가를 위한 3종 중합개시 시스템의 적정 비율
Optimal combination of 3-component photoinitiation system to increase the degree of conversion of resin monomers
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연구목적: 여러 가지 문제점을 가지고 있는 기존의 중합개시제인 CQ와 새로운 개시제인 p-octyloxy-phenyl-phenyl iodonium hexafluoroantimonate (OPPI), 중합촉진제인 지방족 아민(DMAEMA)을 포함한 3종 중합개시시스템을 함유한 레진 모노머의 중합전환률을 증진시키기 위한 각각의 조성 비율을 알아보고 중합개시제와 중합촉진제의 비율에 따른 영향을 분석하고자 하였다. 연구 재료 및 방법: BisGMA/BisEMA/TEGDMA 조성의 레진 모노머를 제조한 다음 다양한 농도 조합의 CQ, OPPI,DMAEMA를 혼합하였다. 각각의 물질을 0.2 wt.% (저농도, L), 1.0 wt.% (중간농도, M), 2.0 wt.% (고농도, H)의 3가지 농도로 혼합하였으며, 그 농도 비율에 따라 9개의 실험군으로 제작하였다: LLL, LMM, LHH, MLM, MMH, MHL,HLH, HML, HHM (CQ-OPPI-DMAEMA의 농도) 중합 시스템이 함유된 각각의 레진 모노머를 NaCl disk에 압착한 다음 Demetron 400 광중합기를 이용하여 5초, 20초, 40초, 60초, 300초 동안 광중합 하였으며, FTIR로 전환률(Degree of Conversion, DC)을 측정하였다. 조성비율은 ANOVA와 Duncan 사후검정법을 이용하였으며 중합개시제와 중합촉진제의비율이 같은 실험군들의 상호비교에는 T-검정도 시행하였다. 결과: 중합개시시스템을 이루는 조성들의 농도 조합에 따라 중합전환률의 차이를 보였으며, MMH 군과 HHM 군이 높은 초기 중합전환률을 보였다. 중합개시제(CQ, OPPI)와 중합촉진제인 DMAEMA의 비율에 따른 중합전환률의 차이를 보이지않았으며, CQ의 농도는 전환률에 영향을 주지 않은 반면, OPPI의 농도는 전환률에 영향을 미쳤다. 결론: 중합전환률이 높으며 밝은 색상이 필요한 경우에는 MMH 조합을, 짙거나 불투명한 경우에는 MMH 조합이 추천된다.
Abstract
Objectives: This study investigated the optimal combination of 3-component photoinitiation system, consisting of CQ, p-octyloxy-phenyl-phenyl iodonium hexafluoroantimonate (OPPI), and 2-dimethylaminoethyl methacrylate (DMAEMA) to increase the degree of conversion of resin monomers, and analyze the effect of the ratio of the photoinitiator to the co-initiator. Materials and Methods: Each photoinitiators (CQ and OPP) and co-initiator (DMAEMA) were mixed in three levels with 0.2 wt.% (low concentration, L), 1.0 wt.% (medium concentration, M), and 2.0 wt.%(high concentration, H). A total of nine groups using the Taguchi method were tested according to the following proportion of components in the photoinitiator system: LLL, LMM, LHH, MLM, MMH, MHL,HLH, HML, HHM. Each monomer was polymerized using a quartz-tungsten-halogen curing unit (Demetron 400, USA) for 5, 20, 40, 60, 300 sec and the degree of conversion (DC) was determined at each exposure time using FTIR. Results: Significant differences were found for DC values in groups. MMH group and HHM group exhibited greater initial DC than the others. No significant difference was found with the ratio of the photoinitiators (CQ, OPPI) to the co-initiator (DMAEMA). The concentrations of CQ didn’t affect the DC values, but those of OPPI did strongly. Conclusions: MMH and HHM groups seem to be best ones to get increased DC. MMH group is indicated for bright, translucent color and HHM group is good for dark, opaque colored-resin. [J Kor Acad Cons Dent 2011;36(4):313-323.]
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