Evaluation of simulated bone lesion in the head of the jaw by using multislice computed tomography

Author(s)

Estevam Rubens Utumi

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Faculdade de Odontologia (FO/SDO)
• Defense date: 2008-09-15

Examining board members

Marcelo de Gusmao Paraiso Cavalcanti; Carlos Alberto Adde; Denise Takehana dos Santos

• Advisor: Marcelo de Gusmao Paraiso Cavalcanti

Abstract

There are limitations for image acquisition using conventional radiography of the temporomandibular joint (ATM) region. Computerized tomography (CT) scan is a better option due to its higher specificity and sensitivity for diagnosis, surgical planning and treatment of bone injuries. The purpose of this study is to evaluate simulated bone injuries of the head of the jaw by CT scan. Spherical lesions were created in the head of 15 dry jaws with dentist drills (sizes 1, 3, and 6). Lesions were evaluated using the CT multislice (64 bits) by 2 examiners independently, in 2 different occasions, using 2 protocols: axial, coronal, and sagittal and parasagittal images for head of the mandible visualization (anterior, lateral, posterior, medial, and superior). Images were compared with the dry jaw (gold standard) regarding the presence of injuries, evaluating the degree of specificity and sensitivity of the CT. Kappa statistics, validity tests, and chi-square tests were used as statistical methods. As a result, we observed the advantage of the association of axial, coronal and sagittal slices with parasagittal slices for detection of lesions in the region of mandibles head. For some lesions localized in polar regions, protocols did not show statistically significant differences regarding the proportion of agreement. Protocols for visualization were created to improve the visualization of lesions in each polar region of the jaws head. Regarding parassagittal slices, there was better lateromedial visualization of the anterior and posterior poles and better anteroposterior visualization of superior, medial, and lateral poles. (AU)

• FAPESP's process: 06/05328-0 - Evaluation of bone lesions in the mandible head by using computed tomography
• Grantee: Estevam Rubens Utumi
• Support Opportunities: Scholarships in Brazil - Master