Affiliation: | 1. Farbwerke Hoechst AG, Frankfurt/M, BRD;2. Institut für Pathologie der Medizinischen Hochschule, Lübeck, BRD;2. Department of Conservative Dentistry, Faculty of Dentistry, Hong Kong University, Hong Kong SAR, China;3. Department of Endodontics, Baylor College of Dentistry, Texas A&M University system Health Science Center, Dallas, Texas |