| Objective:The purpose of this study is to analyze the stress distribution in the interface of implant-supported complete denture in an edentulous mandibule, discuss the effects of the Locator implant-supported overdentures treatment in mandibular edentulate patients, and provide a normative reference for clinical treatment.Methods:A three-dimensional finite model of edentulous mandibular with Locator implant-supported overdenture was established. With2mm height of abutment, we set2implants groups and4implants groups with different implant locations;6implants group, as well as2groups of33,43federation notations’implants with4mm and6mm abutment height.Respectively,100N force was applied perpendicular to the overdenture occlusal surface, while20N horizontal force to the unilateral posterior area. Finally, implant numbers, distribution, abutment height was compared as parameters. At the same time,5mandibular edentulous patients were collected in the Oral Implant Center of Zhejiang University Dental Hospital Medical College of Zhejiang University. We evaluated the mandibular jaw conditions of the five patients, designed the best treatment projects to restore the missing teeth of patients assisted with the data form X-ray and CBCT. The restoration effects were evaluated with clinical examination, radiological examination and chief complaints of patients.Results:The maximum principal stress on the implants increased with abutment height when the the vertical and horizontal forces were applied. The more the implant numbers were, the more the maximum principal stress was under the vertical force, and the situation under the horizontal force was on the contrary. When vertical force was applied, implant distribution bias distal made the smaller maximum principal stress, while the horizontal force situation didn’t provide orderly datas. Cancellous bone presented much smaller and less regular stress values than cortical bone. On the other hand, there was no failure case among the5patients, while4of them suffured the decrease of retention force. The radiographic examination showed that the alveolar bone absorption was within the normal range and consistent with the finite element analysis (FEA) results.Conclusions:From the overall trend, whether it is vertical force and horizontal force, more numbers of implants, distributing in the posterior region and lower abutment height bring smaller Von Mises stress on the implant-bone osseointegrating interface. However, six implant-supported overdenture is not necessarily more advantages than two implants. For those mandibular edentulous patients, Locator implant-supported overdentures could obtain higher satisfaction and success. |
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