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KMID : 0362219950220020207
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Journal of The Korean Research Society for Dental Materials
1995 Volume.22 No. 2 p.207 ~ p.216
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EFFECTIVENESS OF AR-LASER ON POLYMERIZATION OF DENTAL LIGHT-CURED COMPOSITE RESIN
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Park J. S.
Chang H. S.
Song Jin
Choi Yong-Seog
Kim Kyoung-Nam
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Abstract
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The object of this study was to evaluate the effectiveness of Ar-laser on the polymerization of dental light-cured composite resins. Materials were cured by Ar-lasers of 0.6W and 0.9W output and visible light for 5, 10 and 20 seconds. Then the diametral tensile strengths of each groups were measured and compared between others. To check the temperature rise due to light irradiation and polymerization heat, thermocouple was inserted into the material during 20 seconds for Ar-laser and 60 seconds for visible light. Following results were obtained.
1. The diametral tensile strength of Ar-laser group of 5 seconds was 34 MPa which was over the minimum strength specified by ADA Spec. No. 27 and significantly different from that of visible light group of 5 seconds, and Ar-laser group of 10 seconds also showed significantly higher strength than that of visible light group of 10 seconds (p<0.05).
2. The difference of diametral tensile strength between Ar-laser group and visible light group of 20 seconds was not significant(p>0.05).
3. The temperature of resin irradiated by visible light reached the highest within 30 seconds from start of irradiation and the average highest temperature range was 48.9-52.6℃.
4. When irradiated by Ar-laser, the resin showed average temperature of 47.8-55.1℃ at 5 seconds and over 60℃ after 10 seconds.
As a results, Ar-laser curing of 5 seconds was thought to be a favorable alternative because it can provide the sufficient strength without significant difference in temperature rise from visible light.
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