Comparison of the effect of thermal stresses on tooth-colored posts, cores and tooth structures by finite element analysis

Abstract

Objectives: The aims of this study were to analyze the influence of cold heat flow in all ceramic crown material, composite core, zirconium and glass fiber reinforced composite post materials, resin based luting cement and root dentin; and to compare these two tooth-colored post systems about their temperature and thermal stress distributions. <br />Materials and Methods: A 3-dimesional finite element model of maxillary left canine tooth was constructed. All ceramic crown, composite core, tooth dentin, post and bone were modeled. In the first part of this study, initial body temperature was assumed to be 36.5°C and the outer temperature was reduced to 0°C for 5 secs. In the second part, the thermal stress was calculated as a result of temperature change. For the analysis, 7 nodes of the finite element model were selected and heat flow, temperature and thermal stres on these nodes were evaluated. <br />Results: Mean temperature value was 15.75 °C for GFRC post model and 15.47 °C for Zr post model. The maximum von Mises stress was obtained at the node C in both post systems. In general, thermal stress was observed on the cervical part of all-ceramic crown and there was an interface between root dentin-composite core and post material. The temperature gradient of the GFRC post was smaller than that of the zirconia post.<br />Conclusions: Within the limitation of this study, zirconia posts produced greater stress than GFRC posts. Temperature changes had more effect on the post-cement interface and cervical areas than on the other areas.<br /><br /&gt

Mechanical and thermal stress evaluation of PEEK prefabricated post with different head design in endodontically treated tooth: 3D-finite element analysis

“…It can be also concluded from the results that titanium post produced the highest stress followed by the group restored by fiber post. The outcomes of this study corroborate earlier findings which have revealed that metallic post yields larger stresses than metal-free posts 32,41,64) . On the other hand, in PEEK post the resulted stresses were homogeneously distributed over larger areas resulting in the least stress concentration.…”

“…The materials used in the present simulation were assumed to be homogenous, isotropic and linear elastic. Since the analysis was performed for two purposes, mechanical and thermal properties of all materials (Young's modulus, Poisson's ratio, density, specific heat, thermal expansion coefficient, and thermal conductivity) were defined for every part of the assembly according to previous literature data 41,[60][61][62][63][64] , and have been presented in Table 1.…”

“…For the cold thermal simulation, the same procedure was performed for a temperature of 5°C. These thermal loads and time intervals were established based on the measurements from previous literature 30,60,64) , while the FEA should not be used to represent long term effects of low-order heating or cooling of the teeth that might occur during eating or drinking, because is not possible to give a large number of typical results, as a few representative situations will be noted 66) .…”

Evaluation of surface roughness and bond strength of quartz fiber posts after various pre-treatments

“…Pre-fabricated fiber post systems have been widely accepted as a treatment option offering not only esthetics and function [1][2][3][4], but also saving time and reducing costs [5][6][7]. Fiber posts consist of fibers including carbon, glass, quartz and zircon in a resin matrix with a silane coupling agent binding the fibers and matrix together [3].…”