Logo IFED 8th World Congress in Munich 2013


Dr. Fritz Kopp

New developments of traditional impressions         

Friday, September 20th, 2013
Session 3: 13:55-14:20
Dr. Fritz Kopp


A host of excellent impression materials for making impressions in fixed prosthodontics, implant dentistry and operative dentistry are available today. Proper material selection and manipulation allow to make accurate impressions for the fabrication of precisely fitting tooth- and implant supported restorations.
However, many impressions sent to commercial laboratories still are deficient in many respects like inadequately recorded subgingival margins or basic failures in impression material manipulation, using stock trays and thereby ignoring the control of bulk, etc.. As an additional fact, many unacceptable impressions are not a result of deficiencies in the impression materials but rather a result of errors in stages of the restorative procedures, such as improper margin location and overall soft tissue management.
The currently used impression materials, i.e. hydrocolloids, polysulfides, polyvinyl siloxanes, and polyethers, will be analysed relative to a number of ideal properties and characterisics. These include dimensional accuracy, elastic recovery, dimensional stability, flow capacity, flexibility, workability, hydrophilicity, tear strength, patient comfort, interactions, and disinfection. The importance of these critical manipulative variables will be explained, since impression materials vary considerably in relation to these ideal properties. These differences may provide a basis for the selection of specific materials in specific clinical situations.
Based on this, a treatment protocol,clinically tested and successfully performed over the last 25 years in my private office, will be presented. Finally, conclusions will be drawn with regard to the future of the traditional impression.


Dr Kopp received his dental degree in 1975 from the University of Basel School of Dentistry, Switzerland, where he started his postgraduate training in Operative Dentistry and Periodontics, and presented his doctoral thesis in 1977. From 1977 to 1984 he completed postgraduate programs in Fixed and Removable Prosthodontics, and in Oral Surgery as well, at the University of Zurich School of Dentistry. He also was senior lecturer in Fixed and Removable Perio-Prosthetics at Prof. Peter Schärers Department. From 1982 to 1983 he was engaged as a Visiting Assistant Professor at the Department of Occlusion and the TMJ/Oral Facial Pain Clinic of the University of Michigan School of Dentistry in Ann Arbor with Prof Major M. Ash. Since 1984 he maintains a private practice for Perio-Prosthodontics in Zurich. Between 1985 and 1996, he was part-time senior lecturer in Fixed Prosthodontics and Occlusion at the University 0f Geneva Dental School with Prof Urs C. Belser. Dr Kopp has published articles in the fields of Periodontology, Esthetic Dentistry and Oral Implantology, an is co-author of Esthetic Guidelines for Restorative Dentistry, published in 1982 by Quintessence. He has given lectures and clinical courses internationally. Dr Kopp holds membership in the Swiss Dental Society (SSO), the Swiss Society of Reconstructive Dentistry (SSRD) as a registerd specialist, and the L.D. Pankey Alumni Association. He is a fellow of the American Academy of Esthetic Dentistry and an active member of the European Academy of Esthetic Dentistry.

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