Repository of Research and Investigative Information

Repository of Research and Investigative Information

Hormozgan University of Medical Sciences

Effectiveness of silica-lasing method on the bond strength of composite resin repair to Ni-Cr alloy

(2015) Effectiveness of silica-lasing method on the bond strength of composite resin repair to Ni-Cr alloy. Journal of Prosthodontics.

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Purpose: The aim of this study was to evaluate the effectiveness of silica-lasing method for improving the composite resin repair of metal ceramic restorations. Materials and Methods: Sixty Ni-Cr cylindrical specimens were fabricated. The bonding surface of all specimens was airborne-particle abraded using 50 μm aluminum oxide particles. Specimens were divided into six groups that received the following surface treatments: group 1-airborne-particle abrasion alone (AA); group 2-Nd:YAG laser irradiation (LA); group 3-silica coating (Si-CO); group 4-silica-lasing (metal surface was coated with slurry of opaque porcelain and irradiated by Nd:YAG laser) (Si-LA); group 5-silica-lasing plus etching with HF acid (Si-LA-HF); group 6-CoJet sand lased (CJ-LA). Composite resin was applied on metal surfaces. Specimens were thermocycled and tested in shear mode in a universal testing machine. The shear bond strength values were analyzed using ANOVA and Tukey's tests (α = 0.05). The mode of failure was determined, and two specimens in each group were examined by scanning electron microscopy and wavelength dispersive X-ray spectroscopy. Results: Si-CO showed significantly higher shear bond strength in comparison to other groups (p < 0.001). The shear bond strength values of the LA group were significantly higher than those of the AA group (p < 0.05). No significant difference was found among lased groups (LA, Si-LA, Si-LA-HF, CJ-LA; p > 0.05). The failure mode was 100 adhesive for AA, Si-LA, Si-LA-HF, and CJ-LA. LA and Si-CO groups showed 37.5 and 87.5 cohesive failure, respectively. Conclusion: Silica coating of Ni-Cr alloy resulted in higher shear bond strength than those of other surface treatments. © 2014 by the American College of Prosthodontists.

Item Type: Article
Additional Information: cited By 4
Keywords: chromium derivative; dental porcelain; hydrofluoric acid; metal ceramic alloy; resin; silicon dioxide, adhesion; chemistry; materials testing; metallurgy; procedures; prosthetic repair; radiation response; scanning electron microscopy; shear strength; solid state laser; spectrometry; surface property, Adhesiveness; Chromium Alloys; Composite Resins; Dental Porcelain; Dental Prosthesis Repair; Hydrofluoric Acid; Lasers, Solid-State; Materials Testing; Metal Ceramic Alloys; Metallurgy; Microscopy, Electron, Scanning; Shear Strength; Silicon Dioxide; Spectrometry, X-Ray Emission; Surface Properties
Subjects: WU Dentistry. Oral Surgery > WU 500-530 Prosthodontics
Divisions: Education Vice-Chancellor Department > Faculty of Dental > Department of prosthodontics
Depositing User: مهندس هدی فهیم پور

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