| 摘要 |
A positioning device is used to place an implant in the proper vertical position within the soft tissue and bone, provide space for subsequent procedures, and create a proper emergence profile for the final restoration. The lower portion of the positioning device has substantially the same outer shape as that of the implant but without external screw threads or other mechanical features for anchoring the implant in the jawbone. After the hole is countersunk, the depth of the hole in the jawbone is increased incrementally and checked with the positioning device for collar engagement and location of the margin within the gum tissue and bone. After the proper vertical position is attained, a special countersink bur may be used to create needed space around the implant margin and provide a proper crown emergence profile.
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