Evaluation of Surface Roughness of a Ni-Cr Alloy Treated With the Nd/YAG Laser and the Sandblast Technique

Journal of Lasers in Medical Sciences

article

Elnaz Moslehifard¹  Mir Mahdi Seyyed Ashrafi²  Nasim Khosronejad³ 

[1] Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences;Department of Oral and Maxillofacial surgery, Urmia University of Medical Sciences. Urmia;Department of Prosthodontics, Faculty of Dentistry, Urmia University of Medical Sciences. Urmia

关键词: Nd:YAG laser;    Surface treatment;    Surface roughness;    Ni-Cr alloy;   

DOI  :  10.34172/jlms.2021.69

学科分类：基础医学

来源: Shahid Beheshti University of Medical Sciences

【 摘 要 】

Introduction: This study was to assess the effect of various output parameters of laser treatment on roughening the surface of a commercial nickel-chromium (Ni-Cr) alloy as compared to the sandblasting technique.Materials and Methods: Ninety-six disk-shaped (5 mm diameter and 2 mm thickness) specimens in the total were made of a nickel-chromium alloy by using the lost-wax technique. Air-abrasion surface treatment was used for sixteen specimens. Specimens were divided into six groups; one of them was sandblasted and the rest were irradiated by different Nd: YAG laser output parameters as follows: Group A: energy: 122 mJ, frequency: 20 Hz, irradiation duration: 20 seconds, spot size: 1.5 mm; Group B: energy: 122 mJ, frequency: 20 Hz, irradiation duration: 20 seconds, spot size: 3.5 mm; Group C: energy: 122 mJ, frequency: 10 Hz, irradiation duration: 20 seconds, spot size: 3.5 mm; Group D: energy: 102 mJ, frequency: 10 Hz, irradiation duration: 20 seconds, spot size: 3 mm; Group E: energy: 102 mJ, frequency: 20 Hz, irradiation duration: 20 seconds, spot size: 3 mm. Thesurface roughness of all surface-treated specimens was evaluated by using a profilometer, and their average roughness (Ra) was calculated. The average value of each group was analyzed by t-test and one-way ANOVA (SPSS 17).Results: Significant differences (P<0.05) were observed between the study groups. The highest Ra was achieved for the sandblasted group. The Ra value in group C was the highest value among the laser-etched groups.Conclusion: Based on the results, Nd: YAG laser irradiation increases surface roughness, but it is not as efficient as the sandblasting method as a gold standard.

【 授权许可】

CC BY