Original scientific paper
The effect of the base on changes in the colour of acrylic and ceramic crowns
Tomislav Ivaniš
; Zavod za fiksnu protetiku Stomatološkog fakulteta, Zagreb, Jugoslavija
Zvonimir Kosovel
; Zavod za fiksnu protetiku Stomatološkog fakulteta, Zagreb, Jugoslavija
Biserka Lazić
; Zavod za fiksnu protetiku Stomatološkog fakulteta, Zagreb, Jugoslavija
Abstract
The problem of the thickness of non-metal aesthetic dental crowns has often been solved in the literature by the recommendation that the wall of the crown must be at least 1 mm thick. One of the reasons for such a recommendation is to protect the crown from changes in colour due to the effect of cement or the foundation. However, practice has shown, especially when making acrylic crowns, that highly contrasting bases may show through a wall of even 1 millimeter thickness and on the other hand it is not always possible nor necessary to achieve this thickness. The authors investigated the effect of the base in relationship to the layer of acrylic and reached the conclusion that not even the recommended thickness offers in fact sufficient protection from the greatly contrasting base and that it is much more important and simpler too to eliminate the effect of the base by the correct choice of the cement colour. This has proved satisfactory even in cases where for mechanical and statical reasons it was permissible to make thinner crowns.
Keywords
Hrčak ID:
106789
URI
Publication date:
15.12.1975.
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