1. Graduate Program in Dentistry; Federal University of Pernambuco; Recife PE Brazil 50670-901
2. Faculty of Dentistry; Caruaruense Association of Technical and Higher Education; Caruaru PE Brazil 55016-400
3. Department of Physics; Federal University of Pernambuco; Recife PE Brazil 50670-901
4. Health Technical School of Cajazeiras; Federal University of Campina Grande; Cajazeiras PB Brazil 58900-000
5. Department of Clinical and Preventive Dentistry; School of Dentistry, Federal University of Pernambuco; Recife PE Brazil 50670-901