Biomedical subjects
Publications and source records attributed to M Placek.
In the introduction the authors give a brief account of the development of different methods used for correction of a low, shallow vestibule by Schmid and Mörmann's operation which is a modification of Edlan and Mejchar's method. With regard to the favourable results obtained with this operation so far, the authors recommended its wider use.
In the present study, colour stability of two light-curing composite resins--Durafill and Heliosit--was assessed and compared with that of chemically curing composite resins as well as colour stability of heat-curing resin facets. The change in colour was evaluated by comparing the colour of filling or facet with that of the sampler of respective materials. In the case of composite resins a sample of the same colour as the filling was made as well and kept in distilled water in a dark place. The study tried to distinguish the exogenous and endogenous causes of colour changes by means of successive comparison of the colour of the sample with that of the filling and the colour of the sample with the sampler. The colour stability of facets made of heat-curing resin was found to be the highest. The colour stability of light-curing materials was higher than that of the chemically curing ones. The colour of the filling changed more under the influence of endogenous factors than of the exogenous ones.
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