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Untersuchungen zur photometrischen Beurteilung der Paßgenauigkeit von festsitzendem Zahnersatz.

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  • This study deals with the precision of a photometric method of measurement for the judgement of the accurate fitting of prosthodontics, not only based on the crown margin but also on the size of the total space between the tooth stump and the crown. In the following, a simple and easily reproducible method for the determination of quality is presented. For 90 duplicates of a prepared tooth, 90 cast crowns are produced according to clinical criteria. The cast crowns are incorporated with a silicon preparate. The fine texture of the silicon film corresponds exactly to the total space. By scanning the silicion films a grey shaded digital picture corresponding to the colour extinction is received. An image processing software makes it possible to sum up the grey shades into eight intervals. Each interval is attached to an off shade. A special standard measurement process defines a determined mm figure of the size of the interval shade. This way a clear image of each silicon film can be scanned by which the thickness of the silicon and thus the crown space can be defined/determined. On a primarily determined spot the space can be measured. For the check-test of this method the crown has to be cemented on the tooth stump. It has to be sawn at the same spot and to be compared to the real space. The results of both methods are identical.

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Author: Marc-Thilo Sagner
Title Additional (English):Studies on the photometric judgement of the accurate fithing of permanent incorparated casts.
Advisor:Prof. Dr. Bernd Kordaß
Document Type:Doctoral Thesis
Date of Publication (online):2006/07/12
Granting Institution:Ernst-Moritz-Arndt-Universität, Medizinische Fakultät (bis 2010)
Date of final exam:2000/07/14
Release Date:2006/07/12
Tag:accuracy; cast fitting; crown margin; photometric analysis; precision; prothodantic quality
GND Keyword:Zahnersatz, Passung
Faculties:Universitätsmedizin / Poliklinik für Zahnerhaltung, Parodontologie und Endodontologie
DDC class:600 Technik, Medizin, angewandte Wissenschaften / 610 Medizin und Gesundheit