Biomedical subjects
Publications and source records attributed to H Meiners.
Cross linking of the elastomer cast material is an exothermic process. The heat of reaction may produce temperature increases of several degrees centigrade in the thermically insolated samples. The heat of reaction per volume was measured; polysulfide and polyether values are approximately 10 times higher than those for silicone.
The relationship between the effect of retention, the clasp force, and the intersecting angle were studied experimentally under ideal conditions on phantom prostheses. The measured retention values are distinctly higher than the computed values. The reason for this discrepancy was explained. Clasp retention can be optimized if the functional formation of constructed crowns for clasp teeth is adequate.
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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.