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Effectiveness of Silica‐Lasing Method on the Bond Strength of Composite Resin Repair to Ni‐Cr Alloy
Author(s) -
Madani Azam S.,
Astaneh Pedram Ansari,
Nakhaei Mohammadreza,
Bagheri Hossein G.,
Moosavi Horieh,
Alavi Samin,
Najjaran Niloufar Tayarani
Publication year - 2015
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12200
Subject(s) - materials science , bond strength , composite material , adhesive , composite number , dental bonding , ceramic , shear strength (soil) , lasing threshold , scanning electron microscope , layer (electronics) , wavelength , soil science , soil water , environmental science , optoelectronics
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.