Abstract :
Objective: To evaluate the torque expression of right permanent maxillary central incisor with varying bracket positions and to compare the torque expression of the same tooth with different crown-root angulations.
Settings and Sample Population: Finite Element Models of Maxillary Central Incisor were used for simulation of torque expression with various crown-root angles.
Materials and Methods: Three FEM models of a Maxillary Central Incisor with different crown-root angles (170?,175?,180?, and 165°) were constructed with varying bracket heights and subjected to a 30° labial root torque and the resultant torque expressions were evaluated.
Result: The model with the maximum variation in crown-root angle (165?) showed the maximum torque expression at 6mm and minimum at 3mm bracket height while the model with a minimum variation in crown-root angle (180°) showed the minimum torque expression both and 3mm and 6mm bracket height.
Conclusion: With increase in the crown-root angles of a tooth, the torque expression away from the incisal edge increases.
Keyword :
Maxillary Central Incisor, Crown Root Angle, Torque Expression, Finite element model