Comparison of the Effect of Nd:YAG Laser and Sandblasting on Shear Bond Strength of a Commercial Ni-Cr Alloy to Porcelain

سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 408

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شناسه ملی سند علمی:

JR_JDMT-5-3_001

تاریخ نمایه سازی: 20 مهر 1398

چکیده مقاله:

Introduction: Failures might occur at metal‒porcelain interfaces as a problem with metal‒ceramic restorations even with the application of airborne-particle abrasion technique. This study was undertaken to evaluate the effect of Nd:YAG laser treatment on the bond strength of porcelain fused to metal. Methods:  Twenty-four cylindrical specimens (4 mm in diameter and 4 mm in height) were made of a commercially available nickel‒chromium alloy by lost-wax technique. Half of the specimens were surface-treated by air-borne particles and the other half was irradiated with Nd:YAG laser beams (wavelength of 1064 nm, energy and frequency of 120 mJ and 10 Hz, respectively, and a power setting of 6 kW). All the specimens (air-abraded and laser-treated) were covered with a 4-mm layer of opaque porcelain in two-stage baking and subjected to shear bond strength test (a 10-kgf at 1 mm/min) until fracture occurred. A fractured specimen from each group was evaluated using scanning electron microscopy. T-test was used for statistical analysis and statistical significance was set at P<0.05. Results: Shear bond strength was higher in the sandblasted group compared to the laser-etched group (P<0.05). Conclusion: It can be concluded that Nd:YAG laser irradiation increases the shear bond strength of Ni-Cr alloy to porcelain, but further studies should be carried out to evaluate the effect of different parameters of Nd:YAG laser treatment on shear bond strength.  

نویسندگان

Elnaz Moslehifard

Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran

Nasim Khosronejad

Postgraduate Student, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran

Farahnaz Fahimipour

Postgraduate Student, Department of Dental Material, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran

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