Nanofilled 복합레진으로 와동 충전 시 flowable 레진 사용 유무에 따른 피로시험 후의 미세 변연 누출 비교
Comparison of microleakage after load cycling for nanofilled composite resin fillings with or without flowable resin lining
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연구 목적: 제2급 와동에서 nanofilled 레진 충전 시 기구 조작 방향에 따라 변연 누출 가능성이 있다. 따라서 기구 조작에 따른 변연 누출을 줄이고자 인접면변연에 flowable 레진의 사용 유무에 따라 반복 하중 전후에 미세 변연 누출의 차이를 보고자 하였다. 연구 재료 및 방법: 건전한 상태의 24개의 발치 된 치아를 제2급 와동으로 형성한 뒤 그룹F는 nanofilled 레진으로 충전 시 flowable 레진을 liner로 사용하였고, 그룹 NF는 nanofilled 레진으로만 충전 하였다. 300N의 하중으로 104, 105, 106번의 반복하중을 가했다. 반복하중 전후로 모든 시편에서 전체 미세 변연 누출 길이 (T), 축면 미세 변연 누출 길이 (A), 치은 미세 변연 누출 길이 (G), 협측 미세 변연 누출 길이 (B), 설측 미세 변연 누출 길이 (L)를 측정하여, 각변연누출비율을 비교하였다. 통계는 Mann-Whitney test와 Wilcoxon signed ranks test로 하였다. 결과: 하중 전에 그룹F의 전체 미세 변연 누출 백분율은 0.6%이고 그룹 NF는 5.6%이며, 하중 후에는 그룹 F는 13.0%이고 그룹 NF는 36.3%로 그룹 NF에서 미세 변연 누출이 컸고, 반복 하중 횟수가 증가할수록 더욱 커졌으며, 부위상으로는 치은 변연의 미세 변연 누출이 컸다. 통계적 분석 결과 그룹NF의반복횟수별 하중 전후 비교에서 경계성으로 유의한 차이를 보였다. 결론: 제2급 와동에서 nanofilled 레진 충전 시 인접면 변연에 flowable 레진을 liner로 사용할 경우 반복 하중 전후에 미세 변연 누출의 감소에 영향을 주었다. 그리고 liner로 사용된 flowable 레진은 300 N의 반복 하중에서도 견딜 수 있었다.
Abstract
Comparison of microleakage after load cycling for nanofilled composite resin fillings with or without flowable resin lining Sun-Deok Han1, DDS, Won Kim1, DDS, Ji-Young Choi1, DDS, Namsik Oh2*, DDS, Myung-Hyun Lee3, PhD 1Graduate student, 2Professor, Department of Prosthodontics, Inha. University, 3Institute of ceramic engineering and technology, Korea Statement of problem: when using resin for class Ⅱ restoration, micoleakage by instrumentation can be regarded as the primary negative characteristic. A review of the available literature suggests that using flowable resin as liner to decreased microleakage. Purpose: The aim of this study was to determine the influence of the nanofilled flowable resin lining on marginal microleakage after load cycling in class Ⅱcomposite restoration fillings using nanofiller resin. Material and methods: 24 extracted premolars were prepared with class Ⅱ cavity. F group was restored the nanofilled resin with the nanofilled flowable resin as liner. NF group was restored the nanofilled resin only. After restoration, an experiment was performed on 2 groups using a 300N load at 104, 105 and 106 cycles. Prior to and before each load cycling, it was gauged length on total marginal microleakage, axial marginal microleakage and buccal, gingival, lingual marginal microleakage. Data were analyzed with the Mann-Whitney test & Kruskal-Wallis test. Results: There were statistically significant differences between 2 groups and between individual groups. (P < .05) The result showed less microleakage in teeth restored by the nanofilled resin, which was lined by the nanofilled flowable resin. Conclusion: There was significant reduction in microleakage when the nanofilled flowable resin lining was placed underneath the nanofilled resin in classⅡcomposite restoration fillings.
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