[1] Univ Fed Paraiba, Dept Restorat Dent, Div Prosthodont, BR-59092220 Natal, RN, Brazil
[2] Univ Fed Santa Maria, Dept Restorat Dent, Div Prosthodont, BR-97015372 Santa Maria, RS, Brazil
[3] Sao Paulo State Univ, Sao Jose dos Campos Dent Sch, Dept Dent Mat & Prosthodont, BR-12245000 Sao Jose Dos Campos, SP, Brazil
[4] Natl Inst Spatial Res, BR-12227010 Sao Jose Dos Campos, SP, Brazil
[5] Univ Zurich, Ctr Dent & Oral Med, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Dent Mat Unit, CH-8032 Zurich, Switzerland