A 3D finite element analysis of stress distribution on different thicknesses of mineral trioxide aggregate applied on va
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ORIGINAL ARTICLE
A 3D finite element analysis of stress distribution on different thicknesses of mineral trioxide aggregate applied on various sizes of pulp perforation Zeynep Ozkurt-Kayahan 1 & B. Turgut 2 & H. Akin 3 & M.B. Kayahan 4 & E. Kazazoglu 1 Received: 25 August 2019 / Accepted: 20 January 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Objectives The aim of this study was to evaluate the stress distribution on different thicknesses of mineral trioxide aggregate (MTA) placed on various widths of pulp perforations during the condensation of the composite resin material. Materials and methods The mandibular molar tooth was modeled by COSMOSWorks program (SolidWorks, Waltham, MA). Three finite elemental analysis models representing 3 different dimensions of pulp perforations, 1, 2, and 3 mm in diameter, were created. The perforation area was assumed as filled with MTA with different thicknesses, 1, 2, and 3 mm for each pulp perforation width, creating a total of 9 different models. Then, a composite resin material was layered on MTA for each model. A 66.7 N load was applied and an engineering simulation program (ANSYS, Canonsburg, US) was used for the analysis. Results were presented considering von Mises stress criteria. Results As MTA thickness increased, the stress values recorded within the area between pulp and MTA decreased. Strain was decreased when the thickness of MTA increased. Conclusions Stresses at MTA-pulp interface and strain on MTA decreased with the increase in MTA thickness. Clinical relevance In clinical practice, when MTA is required for pulp capping, using a thick layer of the material seems to be a better option in order to reduce the stress under forces of hand condensation of overlying restorative materials. Keywords Finite element analysis . MTA . Pulp perforation . Stress . Thickness
Introduction Direct pulp capping is defined as a procedure in which the exposed vital pulp is covered with an appropriate capping material to maintain the remaining pulp vitality and its biological function [1, 2]. Pulp capping materials should induce pulp cells to form a hard tissue barrier and promote pulp healing
* Zeynep Ozkurt-Kayahan [email protected] 1
Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey
2
Department of Mechanical Engineering, Faculty of Natural Sciences and Engineering, Gaziosmanpasa University, Tokat, Turkey
3
Department of Prosthodontics, Faculty of Dentistry, Sakarya University, Sakarya, Turkey
4
Department of Endodontics, Faculty of Dentistry, Okan University, Istanbul, Turkey
[3–5]. In past decades, the material of choice for direct pulp capping was calcium hydroxide. However, some disadvantages of this material such as dissolution in tissue fluids, poor adhesion, formation of tunnels within dentin barrier, and degradation over time have been reported [6]. An alternative material to calcium hydroxide for direct pulp capping is mineral trioxide aggregate (MTA) [3–5, 7]. It was first described
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