Journal of the Korean Academy of Pediatric Dentistry 2004;31(2):273-279.
Published online May 31, 2004.
INFLUENCE OF TIP DISTANCE ON DEGREE OF CONVERSION OF COMPOSITE RESIN IN CURING WITH VARIOUS LIGHT SOURCES
 
광원에 따른 조사거리의 증가가 복합레진의 중합도에 미치는 영향
김상배, 박호원
강릉대학교 치과대학 소아치과학교실, 구강과학연구소
Correspondence:  , 
Abstract
Recently, newly developed single high-intensity LED curing lights for composite resins are claimed to have a higher intensity than previous LED curing lights and to results in optimal properties and short curing time. The purpose of this study was to determine the curing effectiveness of the curing units and to evaluate the relationship between the degree of polymerization and distance from curing light tip end to resin surface. One composite resin was tested(Filtek Z250). Thin film specimens were cured with a LED curing unit(Elipar Freelight 2, 10s), Plasma Arc curing unit(Flipo, 6s), Halogen curing light(XL3000, 20s) at four curing light tip to the resin surface(0mm, 2mm, 4mm, 6mm). Degree of conversion of composite resins were determined by a Fourier Transform Infrared Spectrometer(FTIR). From the present study, the following results were obtained. 1. In all curing units, relative light intensity was significantly decreased according to the increase of distance of light tip to the resin surface(p<0.05). LED curing units showed a higher percentile decrease in intensity than other curing units. 2. In all curing units, degree of conversion was decreased as increase of the distance but no statistically significant difference(p>0.05) except between 4mm and 6mm(p<0.05). 3. When comparing degree of conversion of light curing units at each distance(0mm, 2mm, 4mm, 6mm), LED curing light had a higher degree of conversion than plasma arc and halogen curing lights at 0, 2, 4mm(p<0.05). At 6mm, there was a no significant difference among the curing units(p>0.05).
Key Words: LED curing light, Plasma Arc curing light, Distance, Degree of conversion, FTIR, Light intensity


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