3종 광중합개시제를 함유한 실험용 복합레진의 미세누출도
MICROLEAKAGE OF THE EXPERIMENTAL COMPOSITE RESIN WITH THREE COMPONENT PHOTOINITIATOR SYSTEMS
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초록
현행 복합레진에서 가장 많이 사용되고 있는 광중합개시제의 일종인 camphoroquinone은 중합 효과가 적고 황색을 띠기 때문에 다른 개시제에 대한 연구가 이루어져 왔다. 이에 본 연구에서는 새로운 개시제인 OPPI (p-octyloxy-phenyl-phenyl iodonium hexafluoroantimonate)를 기존의 camphoroquinone, amine과 다양한 비율로 혼합한 다음, barium glass를 첨가한 실험용 복합레진을 제조하여 각 수복재의 미세누출도를 비교, 평가하였다. 총 4종의 단량체를 제조하였으며 camphoroquinone, OPPI, amine의 조성 중량비는 다음과 같다: A군 - 0.5%, 0%, 1% / B군 - 2%, 0.2%, 2% / C군 - 0.2%, 1%, 0.2% / D군 - 1%, 1%, 2%. 이후 평균 입자 크기 1 μm의 3.2% silane 처리된 barium glass를 중량비 78%로 섞어 복합레진을 제조하였다. 총 55개의 소구치에 치경부를 중심으로 원형 와동을 (직경; 근원심 폭경의 2/3, 깊이; 1.5 mm) 형성한 다음, 자가부식형 접착시스템인 Hybrid Bond로 처리하고 4종의 복합레진으로 수복하였다. 연마 후 치아를 섭씨 5도와 55도에서 각기 30초씩 담궈 500회의 열순환 처리하였으며 전기화학적 방법으로 전기 전도성을 2회 (열순환 처리 후, 1주 간격으로 식염수를 교환하며 3개월 보관 후) 측정, 비교하였다. 미세누출도는 시간 경과에 따라 커지는 양상을 보였으며, 열순환 처리 직후 4종 복합레진 사이에 차이를 보이지 않았지만, 3개월 보관 후에는 D군이 가장 적었으며 C군이 가장 큰 미세누출을 보였다. 열순환 자극 직후 차이를 보이지 않았지만, 3개월 보관 후 측정치로 미루어 볼 때, OPPI와 전반적인 중합시스템이 고농도로 함유된 복합레진(D군)과 CQ와 아민만을 사용한 전통적인 복합레진(A군)이 중합개시시스템을 저농도로 함유한 복합레진(C군)에 비해 우수한 밀폐효과를 보였다. 이는 시간의 흐름에 따라 접착계면의 퇴화가 일어났거나 일부 성분이 용해가 되어 나온 것으로 보이며 앞으로 이에 대한 더 많은 연구가 필요할 것으로 사료된다.
Abstract
This study was done to determine if there is any difference in microleakage between experimental composite resins, in which various proportions of three component photoinitiators (Camphoroquinone, OPPI,Amine) were included. Four kinds of experimental composite resin were made by mixing 3.2% silanated barium glass (78 wt.%, average size; 1 μm) with each monomer system including variously proportioned photoinitiator systems used for photoinitiating BisGMA/BisEMA/TEGDMA monomer blend (37.5:37.5:25 wt.%). The weight percentage of each component were as follows (in sequence Camphoroquinone, OPPI, Amine): Group A -0.5%, 0%, 1% / Group B - 2%, 0.2%, 2% / Group C - 0.2%, 1%, 0.2% / Group D - 1%, 1%, 2%. Each composite resin was used as a filling material for round class V cavities (diameter: 2/3 of mesiodistal width; depth: 1.5 mm) made on extracted human premolars and they were polymerized using curing light unit (XL 2500, 3M ESPE) for 40 s with an intensity of 600 mW/㎠. Teeth were thermocycled fivehundred times between 50℃ and 550℃ for 30s at each temperature. Electrical conductivity (μA) was recorded two times (just after thermocycling and after three-month storage in saline solution) by electrochemical method. Microleakage scores of each group according to evaluation time were as follows [Group: at first record / at second record; unit (μA)]: A: 3.80 (0.69) / 13.22 (4.48), B: 3.42 (1.33) / 18.84 (5.53), C: 4.18 (2.55) / 28.08 (7.75), D: 4.12 (1.86) / 7.41 (3.41). Just after thermocycling, there was no difference in microleakage between groups, however, group C showed the largest score after three-month storage. Although there seems to be no difference in microleakage between groups just after thermocycling, composite resin with highly concentrated initiation system or classical design (Camphoroquinone and Amine system) would be more desirable for minimizing microleakage after three-month storage.
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