Rotation axis of the maxillary molar and maximum tooth movement according to force direction

Carla Scanavini Croci,Paulo Henrique Ferreira Caria

doi:10.1590/1677-3225v14n2a07

Carla Scanavini Croci, Paulo Henrique Ferreira Caria

Open Access

https://doi.org/10.1590/1677-3225v14n2a07

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Abstract

Aim: To evaluate the correlation between the maxillary molar rotation center and the direction of the maximum tooth movement according to the force direction using three-dimensional finite element analysis (3D-FEA). Methods: Computed tomography of a human tooth was used to build a finite element model, which comprised the cancellous and cortical bones, the periodontal ligament and the tooth. After applying lateral and posterior boundary conditions, a 1 N force was applied to the mesial and lingual faces of the maxillary molar to simulate buccal and distal tipping forces on the tooth. Results: The initial displacement of the maxillary first molar was greater for distal tipping than for buccal tipping. The rotation axis for distal tipping in this simulation was located on the furcation of the first molar. For buccal tipping this axis was on the cervical and middle third of the buccal roots of the maxillary first molar. Conclusions: The applied movement interferes in molars Cres location. Higher molar tipping is expected when distal movement is applied rather than buccal movement thanks to the close distance between Cres and location of the force applied to this movement.

Highlights

Received for publication: February 18, 2015 Accepted: June 02, 2015Correspondence to: Carla Scanavini Croci Universidade Estadual de Campinas Faculdade de Odontologia de PiracicabaP.O
When force was applied to the crown in the linguobuccal direction, the molar rotated its axis in mesiodistal direction
Fig 3: 1 N force applied: (A) Distal view, force applied in linguobuccal direction; (B) Lingual view, force applied in mesiodistal directions

Summary

Introduction

Correspondence to: Carla Scanavini Croci Universidade Estadual de Campinas Faculdade de Odontologia de Piracicaba. P.O. Box 52 13414-903, Piracicaba, SP, Brazil. The finite element method (FEM) is a highly precise technique used to analyze stress across hard and soft tissue structures. Intended for engineering, FEM uses computer software to solve equations and calculate stress based on the mechanical properties of the structures to be analyzed[1]. It has been used for decades to determine the rotation center of single and multi-rooted teeth[2,3,4,5,6]. Due to limitations in computing power, the first numerical models were quite simple. Advances in software technology in the last decade allowed the development of models that can reproduce even the periodontium surrounding the tooth[3]

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