Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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EFFECT OF EACH LIGHT CURING UNITS ON THE MICROHARDNESS AND MICROLEAKAGE OF COMPOSITE RESIN

각각의 광조사기가 복합레진의 미세경도와 미세누출에 미치는 영향

  • Jung, Eu-Jin (Department of Conservative dentistry, College of Dentistry, Pusan National University) ;
  • Lee, Hee-Joo (Department of Conservative dentistry, College of Dentistry, Pusan National University) ;
  • Hur, Bock (Department of Conservative dentistry, College of Dentistry, Pusan National University)
  • 정유진 (부산대학교 치과대학 보존학교실) ;
  • 이희주 (부산대학교 치과대학 보존학교실) ;
  • 허복 (부산대학교 치과대학 보존학교실)
  • Published : 2004.01.01
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Abstract

The objectives of this study was to evaluate current visible light curing units regarding microhardness and microleakage. Fourty samples of composite resin(Z-250, 3M) were cured by different light curing units (Flipo, LOKKI; Credi II, 3M; XL 3000, 3M: Optilux 500, Demetron) in acrylic blocks. Microhardness was measured using a calibrated Vickers indenter on both top and bottom surfaces after 24 hours of storage in air at room temperature. Class V cavities were prepared on buccal and lingual surfaces of fourty extracted human molars. Each margin was on enamel and dentin/cementum. Composite resin(Z-250, 3M) was filled in cavities and cured by four different light curing units (Flipo, LOKKl; Credi II, 3M; XL 3000, 3M: Optilux 500, Demetron). The results of this syudy were as follows: Microhardness 1. Flipo showed low microhardness compared to Optilux 500, Credi II significantly in upper surface. Flipo didn't show a significant difference compared to XL 3000. 2. The microhardness resulting from curing with Flipo was lower than that of others on lower surfaces. Microleakage 1. Dentin margin showed significantly high dye penetration rate than enamel margin in all groups(p<0.05). 2. No significant differences were found on both enamel and dentin margin regarding curing units.

Keywords

References

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