Suliman Sama, Deeb Janina Golob, Sulaiman Taiseer, Abdulmajeed Awab, Närhi Timo, Abdulmajeed Aous
Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Turku, Turku, Finland.
Department of Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah, UAE.
J Esthet Restor Dent. 2025 Jul 29. doi: 10.1111/jerd.70013.
Erbium-doped yttrium aluminum garnet (Er:YAG) laser debonding has recently emerged as an alternative method for removing zirconia and lithium disilicate restorations. The optical and mechanical properties are critical factors influencing the success of ceramic restorations. However, limited research has focused on how the Er:YAG laser impacts the optical and mechanical properties of these ceramic materials.
To investigate the effect of Er:YAG laser debonding treatment on the inherent optical and mechanical properties and surface roughness of different zirconia and lithium disilicate ceramic materials.
Forty disc-shaped specimens (14 × 1.2 mm) were fabricated of three different tetragonal zirconia polycrystal (TZP) materials based on their yttria (Y) concentration (3Y-TZP, 4Y-TZP, and 5Y-TZP) and lithium disilicate (IPS E.max) as a control group (n = 10 per group). Each specimen was irradiated with the Er:YAG laser at 335 mJ, 15 Hz, 5.0 W, and 50-μs pulse duration (super short pulse mode). Color change (ΔE), translucency parameter (TP), biaxial flexural strength (MPa), and surface roughness (Ra) values were measured before and after laser irradiation. Data were statistically analyzed using ANOVA and Tukey HSD post hoc tests (p < 0.05) at the 95% level of confidence.
For ΔE, except for 3Y-TZP, all groups displayed an increase in color change beyond the defined acceptability threshold of 1.8. No significant changes in the mean values were observed following Er:YAG laser treatment, except for the 3Y-TZP zirconia group (p < 0.05). TP values showed no significant differences (p > 0.05), except for the IPS E.max group, where TP increased significantly after laser treatment (p < 0.05). Regarding biaxial flexural strength, mean values revealed a significant increase in the 5Y-TZP zirconia and IPS E.max groups (p < 0.05). No significant change in surface roughness values was reported (p > 0.05).
Er:YAG laser debonding treatment altered some optical and mechanical properties of certain dental ceramics. Nevertheless, the reuse of ceramic restorations remains a feasible and clinically valuable option in dental practice.
掺铒钇铝石榴石（Er:YAG）激光脱粘最近已成为去除氧化锆和二硅酸锂修复体的一种替代方法。光学和机械性能是影响陶瓷修复体成功的关键因素。然而，有限的研究集中在Er:YAG激光如何影响这些陶瓷材料的光学和机械性能。
研究Er:YAG激光脱粘处理对不同氧化锆和二硅酸锂陶瓷材料固有光学和机械性能以及表面粗糙度的影响。
基于氧化钇（Y）浓度（3Y-TZP、4Y-TZP和5Y-TZP）制备了三种不同的四方氧化锆多晶体（TZP）材料的四十个圆盘形试样（14×1.2毫米），并以二硅酸锂（IPS E.max）作为对照组（每组n = 10）。每个试样以335 mJ、15 Hz、5.0 W和50微秒脉冲持续时间（超短脉冲模式）用Er:YAG激光照射。在激光照射前后测量颜色变化（ΔE）、半透明参数（TP）、双轴弯曲强度（MPa）和表面粗糙度（Ra）值。数据在95%置信水平下使用方差分析和Tukey HSD事后检验进行统计分析（p < 0.05）。
对于ΔE，除3Y-TZP外，所有组的颜色变化增加均超过定义的可接受阈值1.8。除3Y-TZP氧化锆组外，Er:YAG激光处理后平均值未观察到显著变化（p < 0.05）。TP值除IPS E.max组外无显著差异（p > 0.05），在该组中激光处理后TP显著增加（p < 0.05）。关于双轴弯曲强度，平均值显示5Y-TZP氧化锆和IPS E.max组有显著增加（p < 0.05）。表面粗糙度值未报告有显著变化（p > 0.05）。
Er:YAG激光脱粘处理改变了某些牙科陶瓷的一些光学和机械性能。然而，陶瓷修复体的再利用在牙科实践中仍然是一种可行且具有临床价值的选择。
