不同频率铒激光对氧化锆陶瓷粘接性能的影响

目的: 评价不同频率铒钇铝石榴石（erbium-doped yttrium aluminum garnet,Er:YAG）激光对氧化锆陶瓷粘接性能的影响。方法: 制作3 mm×3 mm×2 mm的钇稳定四方多晶氧化锆（yttrium-stabilized tetragonal zirconia polycrystals,Y-TZP）试件,随机分为6组,即空白对照组（C组）、喷砂组（SB组）和Er:YAG激光蚀刻组（A1-A4组）,频率分别为5、10、15和20 Hz,IPS e.max Press压铸陶瓷为B组,记录各组扫描电镜图像。将陶瓷试件粘接到牙试件上,37 ℃恒温水浴,保存24 h后进行剪切实验,随后在体视显微镜下观察各个试件的断裂模式。采用SPSS 26.0软件包对实验数据进行统计学分析。结果: 扫描电镜显示,不同频率的Er:YAG激光照射Y-TZP陶瓷后,与C组相比,Y-TZP陶瓷表面变得粗糙。剪切实验结果显示,B组剪切强度值最高,为（13.15±2.97） MPa;其次为SB组（7.78±0.97） MPa]和A2组（7.13±0.75） MPa],SB组与A2组相比无统计学差异（P>0.05）。断裂模式结果显示,C组断裂模式以Y-TZP陶瓷与树脂粘接剂界面断裂为主,A1-A4组和SB组断裂模式大多为Y-TZP陶瓷与树脂粘接剂界面断裂,少部分为混合断裂和树脂粘接剂内聚断裂,B组断裂模式全部为混合断裂。结论: 10 Hz Er:YAG激光照射Y-TZP陶瓷可替代110 μm直径的Al₂O₃颗粒喷砂,用于Y-TZP陶瓷的表面改性,增加了Y-TZP陶瓷与树脂粘接剂的粘接强度。

Effect of different frequencies of Er:YAG laser on bond properties of zirconia ceramic

PURPOSE: The effect of different frequencies of Er:YAG laser on bond properties of zirconia ceramic was investigated. METHODS: 3 mm×3 mm ×2 mm Y-TZP blocks were randomly divided into 6 groups（n=5）：control group (C),sandblasting group (SB) and Er:YAG laser group (A1-A4) in which the frequencies were 5, 10, 15 and 20 Hz, respectively, IPS e.max Press ceramics were used as group B. Scanning electron microscope (SEM) images were recorded for each group. The ceramics were bonded to teeth. After being stored in a constant temperature water bath at 37 ℃ for 24 hours, shear test was performed with universal testing machine. Fracture modes were evaluated with stereomicroscope. The data were analyzed with SPSS 26.0 software package. RESULTS： SEM showed that compared with the control group (C),the surface of Y-TZP treated by Er:YAG laser with different frequencies became rough. The results of shear test showed that the highest bond strength value for IPS e.max Press ceramics group(B) was (13.15±2.97) MPa, followed by sandblasting group (SB): (7.78±0.97) MPa, and 10 Hz group (A2): (7.13±0.75) MPa. There was no significant difference between sandblasting group (SB) and 10Hz group(A2) (P>0.05). Fracture modes of the control group (C) were mainly interface fracture of Y-TZP and resin cement;most of the fracture modes of Er:YAG laser and sandblasting group (SB) were interface fracture of Y-TZP and resin cement,a few of mixed fracture and cohesion fracture of resin cement;and the fracture modes of IPS e.max Press ceramics group(B) were all mixed fracture. CONCLUSIONS： Er:YAG laser with 10 Hz can replace 110 μm Al₂O₃ sandblasting for surface modification of Y-TZP, in order to increase the bonding strength between Y-TZP and resin cement.