Objective : To investigate clinical effect of implant supported mandibular overdentures retained with ball - cap or bar - clip attachments.

目的: 了解杆卡和球帽附着体下颌种植覆盖总义齿的机械并发症的情况.

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Objective Using stud type attachments on the natural root in order to get retention for overdentures.

目的利用天然牙的牙根放置自行研制的球帽型附着体,增强覆盖义齿的固位力.

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