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Journal of Long-Term Effects of Medical Implants
SJR: 0.145 SNIP: 0.491 CiteScore™: 0.89

ISSN Druckformat: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2019030030
pages 37-43

Comparison of Stress Distribution in Alveolar Bone with Different Implant Diameters and Vertical Cantilever Length via the Finite Element Method

Ashraf Sayyedi
Department of Prosthodontics, Dental Research Center, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mahsa Rashidpour
Deputy Dean of dental material laboratory, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
Amir Fayyaz
Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Niloufar Ahmadian
Department of Mechanical Engineering, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Mohammad Dehghan
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Forouzan Faghani
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran
Paniz Fasih
Department of Prosthdontics, Dental School, Shahid Behesti University of Medical Sciences, Tehran, Iran


Available bone is one of the important factors in implant treatments. Due to concerns about complications caused by less bone implant contact area, researchers have focused on biomechanical properties of implants and methods to promote them. We investigated stress distribution around bone of different implant diameters and vertical cantilever length. Computed tomography (CT) images obtained of human mandible were used in this study. An SPI implant (Alpha Bio Tech, Simplantology) of two different lengths (10.5 mm and 8.5 mm) and two different widths (3.5 mm and 4.5 mm) were placed into two different groups of bone samples (with and without osteoplasty). Vertical and lateral forces of 100N and 30N at 45° were applied simultaneously in two models. The stress was analyzed using the finite element method. Maximum stress areas were located around the implant neck. Lower stress values in the loaded implants were observed in the shorter group related to the increase in crown height space, when compared to the other group. A wider implant may be better to dissipate force, thus reducing stress on the bone surrounding the implant. Additionally, the use of shorter and wider implants might be a reasonable alternative in sites limited by the height of the residual ridge.


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