Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
권호 표지

AN EVALUATION OF MECHANICAL PROPERTIES OF LIGHT-CURED RESTORATIVE COMPOSITES BY INDENTATION AND COMPRESSION TEST

압입과 압축에 의한 광중합형 수복용 복합레진의 기계적 성질 평가

  • Lee, Yong-Woo (Department of Conservative Dentistry, College of Dentistry, Chonbuk National University and Institute of Oral Bioscience) ;
  • Yu, Mi-Kyung (Department of Conservative Dentistry, College of Dentistry, Chonbuk National University and Institute of Oral Bioscience) ;
  • Cho, Young-Gon (Department of Conservative Dentistry, College of Dentistry, Chosun University and Institute of Oral Bioscience) ;
  • Bae, Tae-Sung (Department of Conservative Dentistry, College of Dentistry, Chonbuk National University and Institute of Oral Bioscience) ;
  • Lee, Kwang-Won (Department of Conservative Dentistry, College of Dentistry, Chonbuk National University and Institute of Oral Bioscience)
  • 이용우 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 유미경 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 조영곤 (조선대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 배태성 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 이광원 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소)
  • Published : 1999.09.05
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Abstract

This study was performed to evaluate the mechanical properties of light-cured restorative composites by compression and indentation tests. Five commercially available light-activated composites (Heliomolar : HM, Aelitefil : AF, Amelogen : AG, Clearfil AP-X : CF, Z100 ZH) were used Disc specimens of 12mm in diameter and 1 mm in thickness and Cylindrical specimens of 3mm in diameter and 6mm in length were prepared for the indentation and compressive test, respectively. All specimens were immersed in distilled water at $37^{\circ}C$ for 30 days. An indentation test of 68-degree trigonal diamond pyramid was made under 10 g load for 15 seconds and an Knoop indentation test was made under 50 g load for 15 seconds. Hardness numbers, characteristic indentation depths and permanent deformation were measured during indentation of the 68-degree trigonal diamond pyramid compressive test was carried out at a crosshead speed of 0.5mm/min. The results obtained were summarized as follows, 1. The highest hardness value was obtained in the CF group and the lowest value was obtained in the HM group. Hardness values showed no significant, difference between AG group and HM group but other groups showed the significant differences in each group(p<0.05). 2. Hardness number by Knoop pyramid were higher than those of 68-degree trigonal diamond pyramid. 3. Plastic deformation during the indentation of 68-degree trigonal diamond pyramid was the lowest in the CF group and the largest in the HM group. Results of Tukey test showed the significant difference between CF group and others; also between ZH and AF groups and AG and HM groups(p<0.05) 4. The highest compressive strength was obtained in the CF group and the lowest compressive strength was obtained in the ZH group. Compressive strength values showed no significant difference between CF group and ZH group but other groups showed the significant differences in each group(p<0.05).

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