Abstract
To evaluate the shear bond strength of intra oral porcelain repair system using different surface treatments when fracture of porcelain with complete metal exposure. Materials and Methods: forty specimens were prepared in form of metal disks (8mm in diameter, this diameter is for each specimen and 15mm height) and randomly divided into 4 equal groups. The first two groups were treated with air abrasion. The other groups leaved untouched. Groups I and III were treated with 37% phosphoric acid while in groups II and IV the surface were treated with 9% hydrofluoric acid, after that the surfaces of all samples were treated with silane coupling agent then bonding and composite were applied according to the manufacturer instructions. All the samples were stored in a normal physiological saline for 7 days. Then the samples were thermocycled after that Shear bond strength was tested using universal testing machine. Results: The result showed that there was a highly significant difference between groups treated with Al2O3 with those untreated one, the acid etch material. There was a highly significant difference between samples acid etched using hydrofluoric acid with those etched with phosphoric acid. Conclusion: Air abrasion and the hydrofluoric acid significantly increase the shear bond strength between composite resin and exposed metal of metal ceramic restoration.
Highlights
Ceramic based restorations are an important part of dentist’s armamentarium for durability and esthetic
Groups I and III were treated with 37% phosphoric acid while in groups II and IV the surface were treated with 9% hydrofluoric acid, after that the surfaces of all samples were treated with silane coupling agent bonding and composite were applied according to the manufacturer instructions
The aim of this study is to evaluate the shear bond strength of intra oral porcelain repair system using different surface treatments when fracture of porcelain with complete metal exposure
Summary
Ceramic based restorations are an important part of dentist’s armamentarium for durability and esthetic. Ceramic materials with an excellent biocompatibility are widely used to achieve a highly esthetic characteristic in metal ceramic restoration[1]. Porcelain fracture is a serious and costly problem for each the patient and the dentist. The problem is more critical if the fracture crown is part of a multiunit restoration. Remarking the crown or fixed partial denture is often in advisable and intra oral repair may be indicated[2]. The ability to bond composite resin to all available restorative materials enables direct repair or correction and reduces the need for complete replacement of restoration. Complete replacement of restoration will be more destructive for the teeth than repair[3]
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