ZHANG Shaoª²Feng1, ZENG Yuª²Geng2, MA Xuanª²Xiang1

    1Department of Prosthodontics, College of Stomatology, Fourth Military Medical University, Xi¬ðan 710033, China, 2Department of Electron and Mechanics, School of Mechanoª²Electronic Engineering, Xidian University, Xi¬ðan 710071, China

    ¡¾Abstract¡¿ AIM: To investigate the stress status of mandibular complete dentures supported by implants with various balanced or unbalanced occlusion. METHODS: A 3ª²D finite element model of mandibular complete dentures supported by implants was established to analyze the stress status with protrusive or lateral occlusions. RESULTS: To the osseointegrated implantª²supported fixed prosthesis, the stresses of implantª²bone interface and denture base in protrusive balanced occlusion were lower than those in protrusive unbalanced occlusion, but no distinct different between balanced and unbalanced lateral occlusions. To the osseointegrated implantª²supported overdenture, its stresses in protrusive and lateral balanced occlusions were lower than those in their unbalanced ones. CONCLUSION: A balanced occlusal scheme should pay attention to the implantª²supported overdenture, also to the implantª²supported fixed prosthesis in protrusive occlusion, but not to the implantª²supported fixed prosthesis in lateral occlusion. ......