| 摘要 |
A screw type implant is formed with only enough thread turns to provide for initial stability and an unthreaded length of the implant has a diameter less than that of the osteotomy in which the implant is to be received by an amount, 200 microns or more, sufficient to allow the formation of haversian-type bone. According to one embodiment the unthreaded length is located at the apical end of the body while in a second embodiment the unthreaded length is located centrally on the body. Another embodiment has a helical groove extending along the unthreaded length and formed with a depth sufficient to allow for the formation of haversian-type bone even when the implant body is not centrally aligned along its length within the osteotomy. Another embodiment shows an ultra short platform type implant that is provided with an annular groove formed in its apical end face for increasing the implant's lateral load receiving capability.
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