Methods: Parameterized bidimensional computer models were developed using the ANSYS 8.1. Numeric values and mathematical relationships, which correspond to the maxillary and mandibular premolars, to the periodontal ligament and to the alveolar bone were used as reference to define the anatomic dimensions of these structures.
Contacts in centric and eccentric positions were reproduced under a 1N load. To simulate tooth mobility reduction under impact loads, the elastic modulus of the periodontal ligament was increased to reach the corresponding ones of the alveolar and cortical bone.
Stress concentration, especially on the cervical region, was analyzed on the most external side of a horizontal course, traced by means of the ANSYS program at 2.0mm above the cement enamel junction
Results: Admitting the hypothesis of the materials elastic analysis, the results obtained for a load value of 1N can be extrapolated to simulate real masticatory loads (180N) and parafunctional loads (500N), as in bruxism
In eccentric positions, teeth bend and tensile stress are generated at the cervical region opposed to the contact side, justifying the possibility to initiation of the lesion. In centric position, tensile stress occurred on both teeth at the central fossae and at the buccal cervical region of the inferior premolar.
Conclusion: With the limitations imposed by the method it was possible to conclude that the simulation of tooth mobility reduction under impact loads diminished the tensile stress value, at all of the analyzed positions.