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Efficiency of Er∶YAG laser for dental hard tissue ablation and its effect on dental surface morphology



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Efficiency of Er∶YAG laser for dental hard tissue ablation and its effect on dental surface morphology


WU Xiuli YU Shaohua YE Lijun WEN Xiujie LIU Luchuan

Department of Stomatology, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, 400042; Department of Stomatology, Southwest Hospital, Third Military Medical University, Chongqing, 400038; Department of Stomatology, the First People’s Hospital of Xiangyang, Xiangyang, Hubei Province, 441000, China


Er∶YAG laser enamel dentin diameter depth thermal damage


Objective     To assess the efficiency of Er∶YAG laser with different frequencies and irradiation time for ablation of dental hard tissues and its effect on dental surface morphology. Methods     Eighty enamel samples and 80 dentin samples were randomly divided into 2 groups (n=40) with Er∶YAG laser ablation for 10 s or 20 s, and each group was further divided into 5 subgroups (n=8) for ablation with Er∶YAG laser at frequencies of 10, 15, 20, 25, or 30 Hz. After irradiation, the diameter and depth of enamel and dentin pits were observed under stereoscopic microscope, and the surface morphology of the enamel and dentin was observed by scanning electron microscopy (SEM). Results     The diameter and depth of enamel and dentin pits following Er∶YAG laser ablation were increased significantly as the laser frequency increased within the range of 10-20 Hz and the ablation time extended (P<0.05). The diameter and depth of the pits were increased only slightly as the laser frequency increased to 25 and 30 Hz and the ablation time increased to 20 s (P>005). SEM showed alterations on the surface morphology of enamel and dentin after the ablation, and damages such as crack and melting occurred on the enamel and dentin surface after laser ablation at frequencies of 25 and 30 Hz.  Conclusion    Er∶YAG laser with an appropriate frequency and ablation time is efficient for dental hard tissue ablation without causing thermal damage to the dental surface.


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Last Update: 2017-08-23