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KMID : 1035320150420040289
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Korean Society for Dental Materials
2015 Volume.42 No. 4 p.289 ~ p.295
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The Effect of Repeated Sintering on the Bond Strength
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Uhm Soo-Hyuk
Hwang Jae-Sun
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Abstract
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Metal-ceramic restorations have been popularly used in esthetic prosthodontic field. However, bonding failures of metal substrate and dental porcelain are often occurred and needed to be repaired or refabricated in clinical situation. Therefore, higher bond strength of metal-ceramic layers is one of the most important factor of clinical success. Recently, as price of gold increases steadily, use of dental base metal alloys are increased. This study investigated the effect of the bond strength according to ISO 9693. Within the results of this study, following conclusions were drawn. The bond strength for different sintering times showed at least 25㎫ (p<0.05) according to accumulated the firing step. This value was required by the international standard (ISO 9693). There was the highest bond strength at fifth repeated sintering. There was significant difference between the bond strength of 10 times sintering and 20 times sintering. But there was no significant difference between the bond strength of 10 times sintering and 15 times sintering. The increase in the repeated sintering resulted in increasing the count and size of the bubble in the porcelain or metal-porcelain interfaces.
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KEYWORD
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Repeated sintering, Bond strength, Non-precious alloy
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