Abstract: Objective:To observe the ultrastructural changes of the bone cavity surface after Er: YAG laser irradiation on the preparation of the implant socket. Methods:By scanning electron microscope to observe the ultrastructure of the surface after the preparation of the sheep femur implant cavity, the control group used the conventional drilling method (step by step drill), but the experiment group took conventional bone drill preparation plus Er: YAG laser surface treatment implant cavity. Results:Er: YAG laser treatment of the cutting surface could retain bone beam structure, with cortial bone cavity open, but without stain layer residue. The surface of the bone cortex was open and porous, without staining layers. Compared with laser-treated surfaces, the porosity of the edge of traditional bone drilling cutting was reduced, and the tissue structure of the cutting surface was flat, similar to the “stain layer” of dental preparation. Conclusions:Er: YAG laser treats the surface of the implant cavity to form an open bone structure, might have a positive effect on the implant osteointegration.

Key words: dental implantation, Er：YAG laser, scanning electron miicroscope, surface morphology