Journal of the Korean Academy of Pediatric Dentistry 2007;34(4):623-631.
Published online November 30, 2007.
EFFECT OF SOFT-START CURING ON THE CONTRACTION STRESS OF COMPOSITE RESIN RESTORATION POLYMERIZED WITH LED AND PLASMA CURING UNIT
Yang-Seok Chung, Nan-Young Lee, Sang-Ho Lee
Department of Pediatric Dentistry, College of Dentistry, Chosun University 
LED와 플라즈마 광원의 완속기시 광중합 방식이 복합레진의 수축응력에 미치는 영향
정양석, 이난영, 이상호
조선대학교 치과대학 소아치과학교실
Correspondence:  Sang-Ho Lee,  Tel: 82-62-220-3860, Fax: 82-62-225-8240, Email: shclee@chosun.ac.kr
Abstract
Effect of Soft-start curing on the contraction stress of composite resin restoration polymerized with LED and plasma curing unit The purpose of this study was to evaluate the influence of soft-start light curing on contraction stress and hardness of composite resin. Composite resin (Filtek Z-250TM, 3M ESPE, USA) was cured using the one-step continuous curing method with three difference light sources ; conventional halogen light (XL3000TM, 3M ESPE, USA) cure for 40 seconds at 400 mw/cm2, LED light (Elipar Freelight 2TM, 3M-ESPE, USA) cure for 20 seconds at 800 mW/cm2 a and plasma arc light (FlipoTM, LOKKI, France) cure for 12 seconds at 1300 mW/cm2. For the soft-start curing method ; LED light (Elipar Freelight 2TM, 3M-ESPE, USA) cure exponential increase with 5 seconds followed by 17 seconds at 800 mW/cm2 and plasma arc light (FlipoTM, LOKKI, France) cure 2 seconds light exposure at 650 mW/cm2 followed by 11 seconds at 1300 mW/cm2 The strain guage method was used for determination of polymerization contraction. Measurements were recorded at each 2 second for the total of 800 seconds including the periods of light application. Obtained data were analyzed statically using Repeated measures ANOVA, One way ANOVA, and Tukey test. 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. Contraction stress was not revealed significant difference between Halogen curing light groups and LED and Plasma Light curing with soft-start group (P>0.05). 3. LED and Plasma Light curing with soft-start showed lower contraction stress than the one-step continuous light curing (P<0.05).
Key Words: Soft-start light curing, Contraction stress, Plasma curing unit


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