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단계별 광중합 방식이 복합레진 수복물의 수축 응력과변연 접합도에 미치는 영향

Effect of step curing on the contraction stress and marginal adaptation of resin restoration

이상호|이난영|박종휘
대한소아치과학회 (The Korean Academy Of Pediatric Dentistry)|2006.06|대한소아치과학회지 (Journal of the Korean academy of pediatric dentistry)|제33권 제2호|pp. 221-232

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키워드

LED광중합복합레진중합 수축수축 응력light curingpolymerization shrinkagecontraction stress단계별 중합step-curing
주제분류치의학

초록

본 연구는 단계별 광중합 방법이 복합레진의 중합 및 수축 응력에 미치는 효과를 비교, 평가하고자 자연치를 대상으로 와동을 형성하고 할로겐 광중합기와 LED 광중합기의 통법에 의한 연속 조사 및 단계별 조사법으로 각각 복합레진을 중합시킨 후 수축 응력을 측정하고 주사전자현미경을 통해 수복물과 와동의 계면부에서 접착 상태를 관찰하여 다음과 같은 결과를 얻었다. 1. 모든 군에서 광중합 직후에는 일시적으로 팽창되었다가 초기에는 급격한 수축 응력의 증가를 보였고 시간이 경과될수록 수축 응력의 증가가 완만해 지는 경향을 보였다(P<0.05). 2. 동일한 광조사 군내에서는 hybrid형인 Filtek Z-250TM군보다는 flowable형인 Filtek flowTM군이 더 적은 수축 응력을 보였다. 3. Filtek Z-250TM 군에서는 LED 단계별 조사군이 수축 응력이 가장 적게 나타났다(P<0.05) 4. Filtek flowTM군 역시 LED 단계별 조사군이 수축 응력이 가장 작게 나타났으나(P<0.05) Filtek Z-250군에서와 같이 다른 조사군에 비해 많은 차이를 보여주지는 못했다. 5. 주사전자현미경으로 관찰한 복합레진과 와동벽과의 접합 상태는 긴밀한 상태를 보였으나 LED 조사군에서 일부 틈이 관찰되었다. 이상의 결과를 종합해 보면 hybrid 형 복합레진의 경우 단계별 중합방식을 사용할 경우 단일광도의 중합방식에 비해 수축 응력을 감소시킬 수 있고 적절한 변연 적합상태를 유지시킴으로써 임상적으로 고광도 LED 광중합기의 경우 단계별 중합방식의 사용이 유리하다고 사료된다.

Abstract

The purpose of this study was to investigate the effect of step-curing mode on polymerization shrinkage and contraction of composite resin restoration. Class I cavities were prepared on the extracted human premolars. The cavities were filled with Filtek Z-250TM(hybrid resin, 3M ESPE, USA) and Filtek flowTM(flowable resin, 3M ESPE, USA) and cured with one of the following irradiation modes; Halogen 40sec with continuous curing, LED 10sec with continuous curing, and LED 13sec with step-curing. Contraction stress was measured with strain gauge which was connected to TML DataloggerTM(TDS-102, SOKKI, Japan) and resin-dentin interfaces were observed by scanning electron microscope. The results of present study can be summarized as follows: 1. Composite resin restoration showed transient expansion just after irradiation of curing light. Contraction stress was increased rapidly at the early phase of polymerization and reduced slowly as time elapsed (P<0.05). 2.Filtek flowTM showed lower contraction stress than Filtek Z-250TM regardless of curing modes. 3. LED step-curing mode showed lowest contraction stress in Filtek Z-250TM compared with other curing modes(P<0.05). 4. LED step-curing mode showed lowest contraction stress in Filtek flowTM compared with other curing modes(P<0.05), but difference in contraction stress was not so greate as in Filtek Z-250TM. 5. Polymerization of composite resin by LED light with step-curing mode and halogen light with continuous mode resulted in better marginal sealing than LED light with continuous mode.

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