作者单位:Univ Zurich, Clin Fixed & Removable Prosthodont & Dent Mat Sci, Ctr Dent & Oral Med, Dent Mat Unit[1]Sao Paulo State Univ, Dent Sch UNESP, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, Brazil[2]Paulista Univ UNIP, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil[3]