Effect of Ti: Sapphire and Nd: YAG Lasers on Shear Bond Strength at the Zirconia - Veneering Ceramic Juncture

Journal of Lasers in Medical Sciences

article

Anamika Abraham¹  DeshrajJain²  AlkaGupta¹  J AChakera³ 

[1] Department of Prosthodontics, Government College of Dentistry;Principal & Head, Department of Prosthodontics, Government College of Dentistry;Laser Plasma Division, Raja Ramanna Centre for Advanced Technology

关键词: Shear strength;    Lasers;    Zirconium;    Femtosecond laser;    Nd: YAG laser;   

DOI  :  10.34172/jlms.2021.71

学科分类：基础医学

来源: Shahid Beheshti University of Medical Sciences

【 摘 要 】

Introduction: This study was conducted to assess the impact of nanosecond and femtosecond lasers on shear bond strength at the zirconia-veneering ceramic juncture.Materials and Methods: The first 60 samples of partially sintered zirconia cylindrical discs measuring 7 mm diameter and 4 mm height were milled and sintered. Then they were randomly divided into three groups namely group C (control, n=10), group N (Nd: YAG laser, n=10), and group T (Ti: sapphire laser n=40) which was further divided based on the duration of laser irradiation, into 4 subgroups (n=10 each) which were 30 seconds, 1 minute, 2 minutes and 3 minutes. Surface treatment was done on sintered zirconia discs based on the group. Following the treatment, the discs were ultrasonically cleaned followed by liner application (IPS Emax Zirliner, Ivoclar-Vivadent) and veneer ceramic layering (IPS e.max Ceram, Ivoclar-Vivadent) of 1.5 mm height. Each sample underwent shear stress in the universal test machine on the mounting jig, and bond strength was evaluated. Data were assessed using ANOVA followed by Tukey’s post hoc multiple comparison analyses.Results: According to one-way ANOVA, there was a significant difference in shear bond strength between the groups. Tukey’s post hoc pairwise comparison test showed a significant difference (P value=0.001) in shear bond strength of all pairs except group C and group N. The results of repeated measures, ANOVA (related and dependent groups), and Tukey’s multiple pairwise comparison test showed that there was a significant difference (P value=0.001) in shear bond strength at 30 seconds and all other groups.Conclusion: Ti: sapphire laser irradiation for 30 seconds can be used as a potential surface treatment to increase shear bond strength at the zirconia-veneering ceramic juncture.

【 授权许可】

CC BY