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KMID : 0602720040080030002
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Implantology
2004 Volume.8 No. 3 p.2 ~ p.15
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A Finite Element Approach to Evaluate Implants Placed Close to the Maxillary Sinus
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Yu Won-Jae
Lee Kyu-Bok
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Abstract
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Statement of Problem : Maxillary sinus and its expansion causes of decreased bone quantity at the molar area, prohibiting placement of dental implants of reasonable sizes. Purpose : To determine the stress reduction around dental implants placed closed to or penetrate the maxillary sinus. Material and methods: ITI solid implants of 10mm in length and 4.1mm in diameter placed at the posterior region of maxilla were axisymmetrically modeled for a series of finite element analyses. Main consideration was given to the stresses at the cervical cortical bone induced by loads parallel to the implant axis. Depending the distance between the alveolar crest and sinus, four different abstract models were assumed. Vertical displacement and stress at the cervical bone were evaluated for comparison. Results and Conclusions: 1. Higher stresses were observed at the cervical area of all the models. 2. The peak stresses at the cervical bone varied as a function of the distance. The more cancellous bone below the apex of the implant exists, the less stresses tend to occur at the cervix. 3. Vertical displacement showed different trend from stress abstract. More bone tissues below the apex of the implant ensured the larger displacement 4. Since the levels of stress and/or displacement were understood to stay within the safe abstract range regardless of the distance between the maxillary sinus and the apex of implants it was concluded that all the four models studied would not fail during the normal function. 5. In the light of stress and displacement, the cortical boundary plate of the maxillary sinus at the implant apex might be beneficial for reinforcement.
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KEYWORD
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ITI implant, Maxillary sinus, Cervical bone stress
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