The effects of an airborne-particle abrasion and XXXX -coating on the bond strength between grooved @entity702 alloy temporary cylinders and provisional veneering materials.

@entity4625 @entity13843 @entity3440 @entity702 @entity7640
STATEMENT OF PROBLEM: Even though mechanical retentive features, such as grooves, are incorporated into the surface of @entity702 alloy temporary cylinders, a reliable bond to veneering provisional materials is not always achievable for screw-retained provisional implant restorations. There is insufficient information about the effect of tribochemical @entity3440 coating on the bond strength between provisional materials and grooved @entity702 alloy temporary cylinders. PURPOSE: The purpose of this study was to evaluate, in vitro, the effect of an airborne-particle abrasion and @entity3440 -coating technique on the bond strength between grooved @entity702 alloy temporary cylinders and provisional veneering @entity7640 and @entity4625 materials. MATERIAL AND METHODS: Forty grooved @entity702 alloy ( @entity13843 ) internal connection implant temporary cylinders were used. A disc of veneering material (7.1   3.4 mm) was created around the midsection of each cylinder. Forty specimens were divided into 4 groups (n=10): group NoTx @entity4625 , no surface treatment and @entity4625 veneering material; group NoTxBisGMA, no surface treatment and BisGMA veneering material; group Ab @entity4625 , airborne-particle abrasion, @entity3440 -coating surface treatment (Rocatec), and @entity4625 ; and group AbBisGMA, airborne-particle abrasion, @entity3440 -coating surface treatment (Rocatec), and BisGMA. Each specimen was subjected to ultimate shear load testing at the interface of the veneering material and the temporary cylinder in a universal testing machine at a constant crosshead speed of 5 mm/min. Data were analyzed with a 1-way ANOVA (a=.05) followed by post hoc Student-Newman-Keuls test. Each specimen underwent surface observation with a light microscope at  40 magnification to compare fracture patterns. RESULTS: Airborne-particle abrasion and @entity3440 -coating surface treatment significantly lowered the shear bond strength (P<.05). The type of provisional material did not significantly affect the shear bond strength, with or without surface treatment. Group AbBisGMA demonstrated the lowest mean value (3.49 MPa) compared to the other groups. CONCLUSIONS: Airborne-particle abrasion and @entity3440 -coating treatment did not improve the bond between grooved @entity702 alloy temporary cylinders and provisional veneering materials. It weakened the provided mechanical retention, especially when it was used with BisGMA veneering material. Material choice, whether it was @entity4625 or @entity7640 , did not make a statistically significant difference.
