title: Stress Distribution on Short Implants at Maxillary Posterior Alveolar Bone Model With Different Bone-to-Implant Contact Ratio: Finite Element Analysis.
abstract: The aim of this study was to evaluate the stress distribution of the short dental implants and bone-to-implant contact ratios in the posterior maxilla using 3-dimensional (3D) finite element models. Two different 3D maxillary posterior bone segments were modeled. Group 1 was composed of a bone segment consisting of cortical bone and type IV cancellous bone with 100% bone-to-implant contact. Group 2 was composed of a bone segment consisting of cortical bone and type IV cancellous bone including spherical bone design and homogenous tubular hollow spaced structures with 30% spherical porosities and 70% bone-to-implant contact ratio. Four-millimeter-diameter and 5-mm-height dental implants were assumed to be osseointegrated and placed at the center of the segments. Lateral occlusal bite force (300 N) was applied at a 25° inclination to the implants long axis. The maximum von Mises stresses in cortical and cancellous bones and implant-abutment complex were calculated. The von Mises stress values on the implants and the cancellous bone around the implants of the 70% bone-to-implant contact group were almost 3 times higher compared with the values of the 100% bone-to-implant contact group. For clinical reality, use of the 70% model for finite element analysis simulation of the posterior maxilla region better represents real alveolar bone and the increased stress and strain distributions evaluated on the cortical and cancellous bone around the dental implants.
authors: 1  Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Eskisehir Osmangazi University, Eskisehir, Turkey.
authors: Duygu
authors: D
authors: Yazicioglu
authors: 2  Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Baskent University, Ankara, Turkey.
authors: Burak
authors: B
authors: Bayram
authors: 2  Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Baskent University, Ankara, Turkey.
authors: Yener
authors: Y
authors: Oguz
authors: 3  Faculty of Dentistry, Department of Prosthodontics, Baskent University, Ankara, Turkey.
authors: Duygu
authors: D
authors: Cinar
authors: 2  Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Baskent University, Ankara, Turkey.
authors: Sina
authors: S
authors: Uckan
mesh_terms: D001696:Biomechanical Phenomena; D003198:Computer Simulation; D015921:Dental Implants; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D021621:Imaging, Three-Dimensional; D008437:Maxilla; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants
keywords: bone-to-implant contact; finite element analysis; short implants