1. Oral and Maxillofacial Surgery, Department of Oral and Maxillofacial Surgery and Traumatology, University of Pernambuco, Recife 50100-130, Brazil
2. Faculty of Dentistry, Department of Oral Rehabilitation, University of Pernambuco, Recife 50100-130, Brazil
3. Massachusetts General Hospital and Harvard Medical School, Boston, MA 02155, USA
4. Araçatuba Dental School, Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Araçatuba 16015-050, Brazil