title: Biomechanical stress in bone surrounding an implant under simulated chewing.
abstract: The concept of reducing nonaxial loading of dental implants has been widely regarded as the standard procedure. The aim of this study was to reveal the biomechanical stress distribution in supporting bone around an implant and a natural tooth under chewing function. Three-dimensional finite element models of the mandibular first molar and the titanium implant both with the mandible in the molar region were constructed. The directions of displacement constraints were determined according to the angles of the closing pathways of chopping type and grinding type chewing patterns. The tooth model showed smooth stress distribution in the supporting bone with low stress concentration around the neck of the tooth. The implant model showed stress concentration in the supporting bone around the neck of the implant, especially in the buccal area. The grinding type model of the implant showed higher tensile stress concentration than the chopping type model at the lingual neck of the implant. The results of this study suggested the importance of considering occlusion under chewing function for understanding the biomechanics of oral implants.
authors.affiliation: Osaka University Graduate School of Dentistry, Division of Oromaxillofacial Regeneration, Department of Occlusion, Osaka, Japan. ishigaki@dent.osaka-u.ac.jp
authors.forename: Shoichi
authors.initials: S
authors.lastname: Ishigaki
authors.forename: Tamaki
authors.initials: T
authors.lastname: Nakano
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yamada
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakamura
authors.forename: Fumio
authors.initials: F
authors.lastname: Takashima
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D003198:Computer Simulation; D003442:Crowns; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D005260:Female; D020342:Finite Element Analysis; D006801:Humans; D008297:Male; D008334:Mandible / Q000502:physiology*; D008409:Mastication / Q000502:physiology*; D008954:Models, Biological; D008963:Molar / Q000502:physiology; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry; D019237:Tooth Cervix / Q000502:physiology; D016474:Weight-Bearing / Q000502:physiology
chemical_list: D015921:Dental Implants; D014025:Titanium