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Occlusal function of patients with fully edentulous jaw bone can effectively recovered by implant treatment, where artificial prostheses are attached to the upper parts of osseointegrated implants [1,2]. Although technique of implant has been advancing and the safety and durability of implant has been improving, some biomechanical problems such as fracture of implant and bone absorption around implant still exist and have been one of the most important problems needed to be solved in dental science. For fully edentulous jaw bone, optimization of implant treatment including determination of the number, length, position and angle of implant is performed by dentists without enough biomechanical consideration, therefore, success of implant treatment for a patient strongly depends on the ability and experience of the dentist in charge. If the biomechanical conditions of jaw bone after implant treatment are understood prior to the treatment, such information is greatly helpful for dentists to conduct the treatment successfully and result in reduction of clinical problems. In this study, a three-dimensional finite element model of an edentulous maxilla was developed by using CT images of an old patient. Distribution of Young’s modulus was considered by using a theoretical relationship between bone density and Young’s modulus. 3, 4 and 6 implants were embedded in the maxilla independently and a prosthesis was attached to the upper parts of the implants. Computational analysis of the maxilla model was performed in order to characterize effects of the number of embedded implants on the stress state of maxilla under two different loading conditions.

Assessment of Mechanical Stability and Safety for Fully Edentulous Maxilla with Dental Implants