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Bone components remodelation of the temporomandibular joint in posterior edentulous individuals

Grant number: 13/15502-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2014
Effective date (End): April 30, 2015
Field of knowledge:Health Sciences - Dentistry - Dental Radiology
Principal researcher:Felippe Bevilacqua Prado
Grantee:Renata Freitas Varanda
Home Institution: Faculdade de Odontologia de Piracicaba (FOP). Universidade Estadual de Campinas (UNICAMP). Piracicaba , SP, Brazil


Changes caused by psterior tooth loss result in changes in the transmission of forces and mechanical stimulation for TMJ, causing bone remodeling in bone components of this joint. Objective: To evaluate morphometrically the bony components of the TMJ in edentulous individuals in CT. Materials and methods: will be used cone-beam CT scans of 150 adults of both genders. The distribution of cone-beam CT scans of the sample groups will be determined by the situation of a person's teeth in relation to the presence/ absence of posterior teeth. Will use the software InVesalius 3.0 (Center for Information Technology - CTI, Campinas, SP, Brazil) for performing the segmentation of images of each CT and thus obtaining the images of the bony components of the TMJ. The segmentation is defined by evaluating a threshold for voxels whose values are in a range that will be defined as follows: the bony components, targeted and evaluated the TMJ will be the glenoid fossa, articular eminence, and mandibular condyle. The 3D reconstruction will be performed to enable the measurement of these components. In Vesalius 3.0 software to obtain the volume (in mm3) by the voxel count of the TMJ bone components previously 3D reconstruction. To evaluate the differences between gender variables and the chi-square and t test will be used. To test the correlation between variables, the Spearman correlation will be used since many of the variables are sorted categorically. The following levels are used for P-P = NS e 0.05 d 0.01 * P <0.05, ** P d 0.001 <0.01, *** P <0.001, with the aid of the software Bio Estat 5.0 (Mamiramuá Foundation, Bethlehem, PA). Expected Results: alterations of the bony components of the TMJ front of biomechanical actions caused by posterior tooth loss, so common in our population and the world will be better understood and assist in the diagnosis and treatment of patients with temporomandibular disorders.

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