1Oral Rehabilitation Program, Department of Dental Materials and Prosthodontics, Araraquara School of Dentistry, UNESP (Univ. Estadual Paulista), Araraquara, Sao Paulo, Brazil
2Center of Health Science, Federal University of Rio Grande do Norte (UFRN), Avenida Senador Salgado Filho, Natal, Rio Grande do Norte, Brazil
3Department of Dentistry, Center of Health Science, Federal University of Rio Grande do Norte (UFRN), Avenida Senador Salgado Filho, Natal, Rio Grande do Norte, Brazil