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A STUDY OF CONTRACTION SHRINKAGE OF COMPOSITE RESINS AND ORMOCERS WITH VARIOUS CURING TIMES

광조사 시간에 따른 복합레진과 Ormocer의 중합수축에 관한 연구

  • Chung, Yeon-Chung (Department of Conservative Dentistry, School of Dentitstry, Dankook University) ;
  • Min, Kyung-San (Department of Conservative Dentistry, School of Dentitstry, Dankook University) ;
  • Lee, Hae-Hyoung (Department of Conservative Dentistry, School of Dentitstry, Dankook University) ;
  • Cho, Kyung-Mo (Department of Conservative Dentistry, School of Dentitstry, Dankook University) ;
  • Cho, Yong-Bum (Department of Conservative Dentistry, School of Dentitstry, Dankook University)
  • 정연정 (단국대학교 치과대학 보존학교실) ;
  • 민경산 (단국대학교 치과대학 보존학교실) ;
  • 이해형 (단국대학교 치과대학 보존학교실) ;
  • 조경모 (단국대학교 치과대학 보존학교실) ;
  • 조용범 (단국대학교 치과대학 보존학교실)
  • Published : 2003.07.01

Abstract

Ormocer has organic-inorganic compound polymers. One of advantages of ormocer is reduced polymerization shrinkage. The purpose of this study was to compare the amount of contraction shrinkage of composite resins and ormocers. Additionally, the time of each material when there is no further change of contraction shrinkage was analysed. Four brands of composite resins (P-60. Surefil, Z-250 and Denfil) and two brands of ormocers (Definite and Admira) were used. 20 seconds, 40 seconds and 60 seconds of curing times were given. Contraction shrinkage of them were measured using a linometer for 80 seconds. The effect of material and curing time to contraction shrinkage at the time of 80 seconds was analysed by two-way ANOVA. The effect of time to contraction shrinkage was analysed by one-way ANOVA and the time when there was no further change of the contraction shrinkage was analysed. The results are as follows: 1. P-60, Definite, Z-250 and Denfil had no further change of contraction shrinkage from the time of 20 seconds, and Surefil and Admira had no further change of contraction shrinkage from the time of 10 seconds. 2. Statistical analysis revealed volumetric shrinkage varied among material (p<0,05). No significant difference of contraction shrinkage among different curing times was found, and there was no effect of interaction between materials and curing times to contraction shrinkage. 3. Definite and Admira showed the statistically same contraction shrinkage with those of Z-250 and P-60. which is higher than that of Surefil and lower than that of Denfil (p<0.05).

Keywords

References

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