Finite Element Analysis of the Influence of Geometry and Design of Zirconia Crowns on Stress Distribution. Issue 2 (27th June 2014)

• Record Type: Journal Article
• Authors: Anami, Lilian Costa; Lima, Julia Magalhaes da Costa; Corazza, Pedro Henrique; Yamamoto, Eron Toshio Colauto; Bottino, Marco Antonio; Borges, Alexandre Luiz Souto
• Is Part Of: Journal of prosthodontics. Volume 24:Issue 2(2015)
• Page Start: 146
• Page End: 151
• Publication Date: 2014-06-27
• Subjects: Prosthodontics -- Periodicals; Dental implants -- Periodicals; Dentistry -- Periodicals; 617.69
• DOI: 10.1111/jopr.12175
• Languages: English
• ISSNs: 1059-941X

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <sec id="jopr12175-sec-0010" sec-type="section"> <title>Purpose</title> <p>To evaluate the influence of the geometry and design of prosthetic crown preparations on stress distribution in compression tests, using finite element analysis (FEA).</p> </sec> <sec id="jopr12175-sec-0020" sec-type="section"> <title>Materials and Methods</title> <p>Six combinations of 3D drawings of all‐ceramic crowns (yttria‐stabilized zirconia framework and porcelain veneer) were evaluated: F, flat preparation and simplified crown; FC, flat preparation and crown with contact point; FCM, flat preparation and modified crown; A, anatomical preparation and simplified anatomical crown framework; AC, anatomical preparation and crown with contact point; and ACM, anatomical preparation and modified crown. Bonded contact types at all interfaces with the mesh were assigned, and the material properties used were according to the literature. A 200 N vertical load was applied at the center of each model. The maximum principal stresses were quantitatively and qualitatively analyzed.</p> </sec> <sec id="jopr12175-sec-0030" sec-type="section"> <title>Results</title> <p>The highest values of tensile stress were observed at the interface between the ceramics in the region under the load application for the simplified models (F and A). Reductions in stress values were observed for the model with the anatomical preparation and modified infrastructure (ACM). The stress distribution in the flat models was similar to that of their respective anatomical models.</p> </sec> <sec id="jopr12175-sec-0040" sec-type="section"> <title>Conclusions</title> <p>The modified design of the zirconia coping reduces the stress concentration at the interface with the veneer ceramic, and the simplified preparation can exert a stress distribution similar to that of the anatomical preparation at and near the load point, when load is applied to the center of the crown.</p> </sec> </abstract>