Abstract
Background: Restoration of pulpless teeth have been difficult because of coronal loss from dental caries, diminished moisture content, endodontic therapy and fractures, resulting in prone to fracture of the tooth during function. Cast metallic band enclosing around cervical surface of a tooth is called ferrule. The role of ferrule is to assist in strengthening the endodontically treated tooth.
 Purpose: In case of ferrule less tooth, the post performs as a wedge and may result in root fracture. Therefore modification in design of ferrule is required. Presence or absence of ferrule of coronal dentin influenced stress distribution pattern within tooth structure. Failure or success of a restoration may be influenced by on how the stress is dispersed to the tooth structure so it is essential to study the stress dispersal pattern within tooth and associated structure.
 Materials and Methods: A three-dimensional FE method (FEM) will be carried out for study and finite element structural analysis programs will be HYPERMESH 11 and ANSYS 18.1 software. Eight 3D models will be created to simulate endodontically restored mandibular second premolar with different coronal dentin configurations. The complete crown will be modeled with a 20-degree, 33- degree, 45-degree facial cusp inclination. The oblique force of 200 N will be executed to the buccal cusp of mandibular second premolar. Analysis of results will be done by both color-coding and numerically. By using FEA software the von Mises equivalent stress (MPa) will be calculated.
Highlights
Nowadays restoration of pulpless tooth is quiet a controversial subject
To make best use of the ferrule effect, dentist should preserve most of coronal tooth structure as while preparing pulpless teeth
The study will be carried out using the 3- dimensional (3D) simulations with finite element method (FEM) and for 3D meshing finite element structural analysis programs will be HYPERMESH 11 and for load application and problem solving ANSYS 18.1 software
Summary
Nowadays restoration of pulpless tooth is quiet a controversial subject. Due to dental structure damage, cavity preparation and root canal procedure those teeth are weakened [1]. Post plays important role in reduction of stress in cervical area of tooth as it distribute force along the post length. Post plays vital role in maintaining the remaining tooth structures. To preserve the health of the masticatory system by managing occlusal discrepancy plays very important role in restorative dentistry [3,4,5]. To make best use of the ferrule effect, dentist should preserve most of coronal tooth structure as while preparing pulpless teeth. By utilizing of 3- dimensional (3D) simulations with finite element method, the study intended to evaluate effect of occlusal contact position, type of occlusal contact and cuspal angulation on stress distribution in root treated second mandibular premolar with dissimilar ferrule configurations
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