[The problem of retention of external ear prostheses].
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Biomedical subjects
Publications and source records attributed to A Rossbach.
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If temporary crowns are lost following preparation in the supporting areas, the condyles may be displaced. It however was established that the normal position of the condyles can be approximately reproduced with a central bearing device. On the basis of the results, it was determined that the support pin method is superior to the procedure using central wax registration.
The gloss on die-cast prostheses is sometimes achieved by coating the surface with enamel. A case was reported in which the prosthesis enamel D/22 Meton produced an allergic reaction in the mucosa.
The reproducibility of a calotte-shaped movement with the Dentatus articulator was reported. A calotte mounted in the upper part of the articulator was read by a electronic pointer mounted in the lower part of the articulator during lateral excursions. It was shown that calotte-shaped movements are reproducible with an accuracy of 60 mu and that the condyle path inclincation and incisal guidance are more important than the Bennett angle.
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Calculations of occlusal interferences in calotte articulation are reported. It is shown that magnitudes of error due to the different radii of the given calotte and mounting template utp to +/- 20 mm amount to 0.1 mm at most. On the other hand the occlusal errors due to different angles of incidence of the mounting template may attain a magnitude which prevents incorporation of total prostheses.
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Displacements of the condyle caused by preparations in the supporting area are reported. These displacements occur only if the second premolar is included in the preparations. They are ventrocranial in direction and increase in extent if the first premolar and the canine are included in the preparations. Values of up to 2.8 mm in carnial and of up to 2.8 mm in ventral direction can be observed.
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