fa Comparison of the effect of three abutment-implant connections on stress distribution at the internal surface of dental implants: a finite element analysis پریودنتولوژی Periodontology پژوهشي Research <b> Background and aims</b>. The aim of this study was to determine the stress patterns within an implant and the effect of different types of connections on load transfer. <div><b>Materials and methods.</b> Three different types of implant-abutment connections were selected for this study. Sample A: 1.5-mm deep internal hex corresponding to a lead-in bevel sample B: a tri-channel internal connection and sample C: in-ternal Morse taper with 110 degrees of tapering and 6 anti-rotational grooves. Four types of loading conditions were simu-lated in a finite element model, with the maximum von Mises stress set as output variables. </div><div><b>Results.</b> The maximum stress concentration at the inner surface of the fixtures was higher than the stress value in bone in all of the samples. Stress values in sample B were the lowest amongst all of the models. Any alterations in the amount and direction of the 100-N axial load resulted in an increase in fixture surfaces stress. Overall, the highest amount of stress (112 MPa) was detected in sample C at the inner surface of the fixture under a non-axial load of 300 N.</div><div><b> Conclusion</b>. Stress concentration decreased when the internal surface area increased. Creating three or six stops in the internal surface of the fixtures resulted in a decrease in stress.</div><hr><p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><b>Source: </b>Journal of Dental Research, Dental Clinics, Dental Prospects </p> <p class="MsoNormal" style="text-align: left direction: ltr unicode-bidi: embed"><a href="http://dentistry.tbzmed.ac.ir/joddd/index.php/joddd/article/view/508" target="_blank"><font color="#0000ff">Full Text</font></a></p> Biomechanics, dental implant/abutment, finite element, stress. 0 0 http://idai.ir/browse.php?a_code=A-10-32-3236&slc_lang=fa&sid=1 Saeed Raoofi 100319475328460014915 100319475328460014915 No Department of Periodontics, Faculty of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran Maryam Khademi 100319475328460014916 100319475328460014916 No Department of Periodontics, Faculty of Dentistry, Ahwaz University of Medical Sciences, Ahwaz, Iran Reza Amid Reza_amid@yahoo.com 100319475328460014917 100319475328460014917 Yes Department of Periodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Mahdi Kadkhodazadeh 100319475328460014918 100319475328460014918 No Department of Periodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Mohammad Reza Movahedi 100319475328460014919 100319475328460014919 No Department of Industrial Manufacturing, Sharif University of Technology, Tehran, Iran