| EFFECT OF STEP CURING ON THE CONTRACTION STRESS AND MARGINAL ADAPTATION OF RESIN RESTORATION |
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| 단계별 광중합 방식이 복합레진 수복물의 수축 응력과 변연 접합도에 미치는 영향 |
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박종휘, 이난영, 이상호 |
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조선대학교 치과대학 소아치과학교실 구강생물학연구소 |
Correspondence:
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| Abstract |
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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 ailed 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 ode resulted in better marginal sealing than LED light with continuous mode. |
| Key Words:
Light curing, Polymerization shrinkage, Contraction stress, Step-curing; LED |
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