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KMID : 1004520120280030223
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Journal of Dental Rehabilitation and Applied Science
2012 Volume.28 No. 3 p.223 ~ p.232
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The Effect of Thickness of Porcelain on Shear Bond Strength Between Heat-Pressed Porcelain and Non-Precious Metal
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Jo Jung-Min
Lee Cheong-Hee
Lee Kyu-Bok
Cho Jin-Hyun
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Abstract
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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㎜ × 4㎜ × 4㎜) specimens were prepared. 60 specimens were applied to feldspathic porcelain and the others were applied to heat-pressed porcelain by 1㎜, 1.5㎜, 2㎜, 2.5㎜, 3㎜ and 3.5㎜ 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 1㎜ 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 1㎜ and 3㎜ 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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KEYWORD
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Feldspathic porcelain, Heat-pressed porcelain, Shear bond strength, porcelain thickness
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