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ORIGINAL ARTICLE
Year : 2008  |  Volume : 8  |  Issue : 2  |  Page : 94-97

Influence of cavity preparations and restorative procedures on stress distribution by finite element method


1 Restorative Dentistry, University Federal de Minas Gerais, Brazil
2 Department of Mechanical Engineering, School of Engineering, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
3 Department Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
4 Department Dentistry, Estadual University of Montes Claros, Montes Claros, Minas Gerais, Brazil

Correspondence Address:
Walison A Vasconcellos
Rua Gabriel Passos 343, São Domingos do Prata, MG
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-4052.43611

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The influence of the preparation and restoration of cavities by using composite resin on the stress distribution of the upper central incisor was evaluated through a three-dimensional finite element method. Nine models were constructed. Model 1 was prepared with the enamel, coronary and radicular dentin, pulp and cortical and cancellous bones. In models 2 to 5, the dentin and enamel were removed to simulate interproximal and endodontic access cavity preparations and. In models 6 to 9, the preparations were restored with composite resin. All models were subjected to a 100-N static load with an inclination of 45° at a distance of 2.0 mm from the incisal edge of the palatal surface of the tooth. Compared to healthy teeth, the conservative interproximal cavity preparation resulted in an 80% increase in the maximum von Mises stress concentration, and in the endodontic access cavity, the stress concentration increased to 99%. In the extensive interproximal cavity preparations, the maximum stress concentration increase to 134% compared to that of healthy teeth and in the endodontic access cavity, the stress concentration increased to 173%. The stress concentration in the endodontic access alone increased to 116% compared to that of a healthy tooth. The values of stress concentration for extensive interproximal and two interproximal cavities, increased to 118% and 127%, respectively. It was concluded that the reduction in the dental structure led to an increase in the stress concentration. The biomechanical conditions for cavity restoration with composite resin have been established.


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