Obturating the pink tooth: An in vitro comparative evaluation of different materials

Aim: The aim is to evaluate the obturating potential of thermoplasticized gutta-percha, mineral trioxide aggregate (MTA), and Biodentine in simulated internal resorption cavities. Materials and Methods: Thirty human extracted teeth with single canal and mature apex were collected for the study. Access cavity was prepared in each. For all the teeth, standardized instrumentation was done to apical size of ISO #50 K stainless steel hand file. Following instrumentation, at the length of 6 mm short of working length, internal resorption cavity was simulated using Gates–Glidden drill, as the canal of the selected teeth was wide enough and thus widening of the canal occurred only at the desired working length. The teeth were radiographed to check internal resorption cavity. The teeth were randomly divided into three groups; ten teeth in each group. Samples were obturated as follows: Group 1 – thermoplasticized gutta-percha, Group 2 – MTA, and Group 3 – Biodentine. Samples were stored at room temperature for 48 h. After 48 h, samples were evaluated radiographically and microscopically using Dental Operating Microscope. Statistical analysis of the results was performed using Kruskal–Wallis test. Results: Results obtained were statistically significant. Conclusion: MTA and Biodentine showed better sealing than thermoplasticized gutta-percha

Stress distribution in endodontically treated single-rooted premolars restored with everstick post and sharonlay: A finite element analysis

Background: The objective of the study is to compare stress distribution in a tooth restored with everstick post and sharonlay by means of three-dimensional finite element analysis (3D-FEA). Materials and Methods: An experimental original study was carried out in which two 3D-FEA models were constructed: (1) tooth restored with everstick post and metal ceramic crown and (2) tooth restored with sharonlay. The material properties were assigned and a force of 100N, 200N, 300N, and 400N was applied to the centric stop of the occlusal surface in centric occlusion at a 45° inclination in a linguolabial direction to the long axis of the tooth. Analysis was run and the stress distribution pattern was studied. As all stress distribution analysis was performed with the Ansys 11.0 software (Inventor AutoCAD 2010; Autodesk) program, the significance of P value or tests for statistical analysis was considered. Results: Sharonlay showed more total deformation, larger stress, and strain concentration than that of everstick post. Conclusion: Tooth restored with sharonlay showed greater chances of deformation than everstick post. It also showed maximum strain concentration near the apical portion of the remaining tooth structure and more stress in the cervical third of the postsystem than everstick post