Er∶YAG激光处理钛盘表面的形态学观察

Morphological Changes of Titanium Surface after Er:YAG Laser Irradiation

目的扫描电镜下观察不同能量Er∶YAG激光照射后钛盘表面的形态学改变。方法钛盘18枚,分为两大组:对照组2枚,不进行激光照射;激光组16枚,采用不同能量的激光照射。激光组按照不同能量100、150、200和250 m J,分为4小组,每组4个钛盘,以45°照射钛盘表面,照射时间5 s。激光组4个小组中,每组有2枚钛盘在无水条件下照射;另外2枚在100%H2O条件下照射。扫描电镜下观察钛盘表面的形态学改变。结果经Er∶YAG激光照射后,在无水条件下,各组钛盘表面均出现明显熔融、裂纹等变化,而且随着能量升高变化明显。在100%H2O条件下,100 m J的脉冲能量对钛盘表面无明显影响;超过100 m J,钛盘表面出现不同程度的熔融。随着能量升高,钛盘表面形态改变明显。结论 Er∶YAG脉冲能量控制在100 m J对钛盘形态影响较小。

Objective To evaluate the morphological changes of the titanium surface after irradiation with the Er ∶ YAG laser at various energies.Methods There are18 titanium discs in total,2 titanium discs that were not lased served as the control. 16 titanium discs were divided into four groups according to the irradiated various power settings with Er ∶ YAG laser（ 100 m J,150 m J,200 m J,250 m J）. In each group,there are 2 discs which were irradiated with 0% H2 O,and another 2 titanium discs with 100% H2 O. The surface of each disc was treated for 5 s at 45°. Then the surfaces were analyzed by scanning electron microscopy（ SEM）.Results After Er ∶ YAG laser irradiation,with 0% H2 O,all the four groups demonstrated significant melting,cracking,and crater formation on the surfaces in an energy-dependent manner. On the other hand,with 100% H2 O,the titanium surfaces have not significant changes at 100 m J / p. When the pulse energy is above 100 m J,the pulsed Er ∶ YAG laser induced partial melting,cracking,and crater formation on the surfaces in an energy-dependent manner.Conclusions The Er ∶ YAG laser does not damage titanium surfaces at 100 m J,and seems to be safe and useful of treating peri-implantitis,the power output of the Er ∶ YAG laser must be limited so as to avoid surface damage.