[Comparison of various elastomer types--polyaddition silicones].
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Biomedical subjects
Publications and source records attributed to H Meiners.
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Protracting the separation of wax model and work stump in order to overcome the inner tension in the wax at room temperature is not a dependable measure for preventing shrinkage of the cast.
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Cross-linking of elastomeric impression materials is an exothermic process. In addition to the frictional heat produced during mixing, the reaction heat may increase the temperature by several degrees Centigrade in thermically isolated samples.
Extent and direction of dimensional changes in the finished cast crown resulting from the thermic expansion of the wax model are determined as a function of the time the crown was subjected to tempering as a function of tempering temperature. Expansion of the wax model does not come up to the expectation of preventing a reduction of the cast object.