Effect of various crown-root angles on the resultant stress on the root and periodontal ligament of a maxillary central incisor-A three dimensional finite element study

Abstract

To evaluate and compare the resultant stress on the root and PDL of a Maxillary Central Incisor with various crown-root angles. Settings and Sample Population: Finite Element Models of Maxillary Central Incisor were used for simulation of stress on the root and PDL. Three FEM models of a Maxillary Central Incisor with different crown-root angles (170˚, 175˚ and 180˚) were constructed and subjected to a force of 2N respectively. The resultant stress generated in the periodontal ligament and root surface were recorded and compared between the models.: The model with the maximum change in crown-root angle (180˚) showed the maximum stress in both PDL and root surface. The stress recorded on the root surface was more on the cervical 2/3rd in the palatal region of the tooth as compared to the labial region. Maximum stress in the PDL was seen only in the cervical 3rd of the third model. With increase in the crown-root angles of a tooth, the stress in the PDL and on the root surface increases.