1. Department of Radiology, School of Dentistry, Federal University of Bahia, 40110-150 Bahia, Brazil
2. Clinical Dentist, Serviço Odontológico de Diagnóstico Computadorizado (SODIC), Department of Radiology, 49.015-130 Aracaju, Sergipe, Brazil
3. Department of Radiology, Piracicaba Dental School, University of Campinas, 13414-903 São Paulo, Brazil
4. Fundação de Amparo à Pesquisa do Estado da Bahia, 40210-720 Bahia, Brazil