title: Comparative evaluation of osseointegrated dental implants based on platform-switching concept: influence of diameter, length, thread shape, and in-bone positioning depth on stress-based performance.
abstract: This study aimed to investigate the influence of implant design (in terms of diameter, length, and thread shape), in-bone positioning depth, and bone posthealing crestal morphology on load transfer mechanisms of osseointegrated dental implants based on platform-switching concept. In order to perform an effective multiparametric comparative analysis, 11 implants different in dimensions and in thread features were analyzed by a linearly elastic 3-dimensional finite element approach, under a static load. Implant models were integrated with the detailed model of a maxillary premolar bone segment. Different implant in-bone positioning levels were modeled, considering also different posthealing crestal bone morphologies. Bone overloading risk was quantified by introducing proper local stress measures, highlighting that implant diameter is a more effective design parameter than the implant length, as well as that thread shape and thread details can significantly affect stresses at peri-implant bone, especially for short implants. Numerical simulations revealed that the optimal in-bone positioning depth results from the balance of 2 counteracting effects: cratering phenomena and bone apposition induced by platform-switching configuration. Proposed results contribute to identify the mutual influence of a number of factors affecting the bone-implant loading transfer mechanisms, furnishing useful insights and indications for choosing and/or designing threaded osseointegrated implants.
authors.forename: Luigi
authors.initials: L
authors.lastname: Baggi
authors.forename: Michele
authors.initials: M
authors.lastname: Di Girolamo
authors.affiliation: Department of Civil Engineering and Computer Science, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Vairo
authors.forename: Gianpaolo
authors.initials: G
authors.lastname: Sannino
mesh_terms: D001696:Biomechanical Phenomena; D019295:Computational Biology; D003198:Computer Simulation; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D017267:Dental Prosthesis Design / Q000706:statistics & numerical data*; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000706:statistics & numerical data; D008437:Maxilla / Q000502:physiology / Q000601:surgery; D003765:Models, Dental; D016348:Osseointegration; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants