作者单位:Department of Dental Materials, University of Granada, Granada, Spain[1]Department of Fixed Prosthodontics and Dental Materials, School of Dental Medicine, Policlinico Le[2]Department of Dental Materials, University of Zaragoza, Huesca, Spain[3]Department of Fixed Prosthodontics, Dental Materials, University of Siena, Policlinico Le Scotte[4]