Chulalongkorn University Dental Journal

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In Dentistry, bonding between resin cement and metal alloy plays an important role in many clinical applications. From several studies, the failures at resin-metal interface are the most frequently reported. Numerous methods are available for bonding resin to alloy. The sillica coating methods have been developed to improve chemo - mechanical retention. Three different silica coating methods were described. The original Silicoater system is a pyrolytic deposition of an intermediate SiOx layer to the alloy surface. The Rocatec system is a tribochemical silica coating process, including two sandblasting steps to the alloy surface. The Silicoater MD system is a thermal silica coating process which a chromium oxide-dotted silica layer is baked onto the surface. Many studies showed that the Silicoater technique improves bond strength significantly as compared to sandblasting, electrolytic etching, chemical etching, and electroplating. Silicoated alloys give substantially higher bond strength to resin cement than resin-to-resin and/or resin-to-etched enamel, and most failures are of a cohesive type. Selecting luting resin cement seems to be a critical factor in achieving a successful resin to metal bond.



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