Stress analysis of implant-retained maxillary overdenture without palatal plate.

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The stress concentration part of an implant-retained maxillary overdenture(IOD) was examined. Finite element method and four implants were connected by round bars, the upper jaw edentulous jaw model which carried silicone artificial mucosa was built, using strain gages, the perpendicular load was carried out and stress analysis was performed to first molars. As result, It turned out that compression stress is most applied to denture base resin near the end of a clip in the present study.