The Effect of Thickness of Porcelain on Shear Bond Strength Between Heat-Pressed Porcelain and Non-Precious Metal

도재의 두께가 하부금속과의 전단결합강도에 미치는 영향

  • Jo, Jung-Min (Department of Dentistry Graduate School, Kyungpook National University) ;
  • Lee, Cheong-Hee (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Lee, Kyu-Bok (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Cho, Jin-Hyun (Department of Prosthodontics, School of Dentistry, Kyungpook National University)
  • 조정민 (경북대학교 치의학전문대학원 치과보철학교실) ;
  • 이청희 (경북대학교 치의학전문대학원 치과보철학교실) ;
  • 이규복 (경북대학교 치의학전문대학원 치과보철학교실) ;
  • 조진현 (경북대학교 치의학전문대학원 치과보철학교실)
  • Received : 2012.05.10
  • Accepted : 2012.09.25
  • Published : 2012.09.30

Abstract

The purpose of this study was to investigate the effect of various thickness of porcelain on shear bond strength between metal coping and porcelain. So, various thickness of feldspathic porcelain and heat-pressed porcelain were built up and compared. 120 metal cube($4{\times}4{\times}4mm$) specimens were prepared. 60 specimens were applied to feldspathic porcelain and the others were applied to heat-pressed porcelain by 1mm, 1.5mm, 2mm, 2.5mm, 3mm and 3.5mm thickness. The measurement of shear bond strength was performed by Instron universal testing machine. The following results were obtained from this study. 1. As thickness of feldspathic porcelain increases, shear bond strength has decreased. Feldspathic specimens with 1mm porcelain thickness were significantly stronger than other feldspathic subgroups. 2. There was no significant difference of shear bond strength according to porcelain thickness in heat-pressed porcelain group. 3. In comparison between subgroups with same thickness, feldspathic porcelain group had stronger shear bond strength than heat-pressed porcelain. There were significant difference between 1mm and 3mm porcelain thickness group. 4. In almost cases, fracture surface was found on both metal and porcelain surfaces. As thickness of porcelain was increased, metal exposure was decreased.

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