Clinical Evaluation Of The Effect Of Implant Supported Denture Treatment

Modern oral implantology was given birth in the middle of 20 century. It started to progress rapidly, since Swedish professor Branemark presented the theory of osseointegration. Oral implantology in our country advanced gradually along with the introduction of osseointegration and several implant systems. Since the middle of last decade there are more and more researches in this field, which have been focused on implant-tissue interface, biomechanics and implant materials.Implant supported denture (ISD) has many advantages over the traditional denture; therefore it is a preferable choice. And it is called the third dentition of human being. The first part of this thesis is a descriptive analysis of the clinical data of oral implant center in West China Hospital of Stomatology, Sichuan University, in recent years. Hence it is clear about the state of the center and the use of ISDs in the center. The results are as follows. During last two years, there were about 10-20 patients each month receiving ISDs in this center. And the age of most patients was in the range of 30-59. ITI and Frialit-2 were the most commonly used implant systems, comprising 74.94% of the total number. And 48.99% of the implants were in the posterior regions of mandibular bone.In this paper, the possible causes of implant failure are discussed, concerning the failure cases. Meanwhile, some corresponding settlements are put forward.In the second part of this research, the direct digital-panoramic radiographs of the implant cases are measured to study peri-implant bone absorption for evaluation of the effect of ISD treatment. The peri-implant bone absorption is about 0.3mm/mo. in the 1st month (0.37l4±0.19779mm/mo.) and 3rd month (0.3120±0.43996mm/mo.) after primary implantation surgery. Later, the absorption slows down. The mean value is 0.03mm/mo. in the 6th and 12th month after primary surgery (0.0426±0.24814mm/mo. and 0.0363±0.14500mm/mo., respectively). The bone absorption values are different, between anterior and posterior regions of maxillary bone (0.0513±0.26454mm/mo. and 0.1713±0.27952mm/mo., respectively), and between anterior region of maxillary bone and posterior region of mandibular bone (0.1707±0.37025mrn/mo.). The possible causes of the different bone absorption are the differences in local anatomy, histological structure and function. And there are no differences in bone absorption among different implant systems, or between mesial and distal regions of the same implant. After that, the measurement method is discussed, and it is concluded that the results of the research are consistent with the truth. And then, the possible causes and settlements of peri-implant bone absorption are discussed.