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Biomedical subjects

W D Schwarz

Publications and source records attributed to W D Schwarz.

At least 19 recordsLinked to original sources
PubMed1995

The qualitative assessment of complete dentures produced by commercial dental laboratories.

Comprehensive criteria and simple methods of assessment have been developed for the evaluation of complete dentures supplied by commercial dental laboratories. One hundred laboratories in England and Wales were selected by random sampling. A single identical complete denture case was sent from general practice addresses to each of the selected laboratories and each of the laboratory stages evaluated according to specific criteria. This paper is concerned only with the evaluation of the finished dentures. Half of the cases were treated as NHS cases and half as 'private' cases. The private cases were further subdivided into those where details were left to the laboratory and those where detailed instructions were given for all stages of denture construction. Wide variations were found in both the quality and cost of complete denture laboratory work. Evaluation of some key features of finished dentures suggests that the quality of work was superior for the private cases in which detailed instructions were given to the laboratory. Even for the private (specified) cases, however, important faults were found in a number of cases.

Communication↗
PubMed1992

Effect of loading on a substitute oral mucosa and underlying bone.

Some mechanical effects of stresses on a bone and oral mucosa model were investigated. A substitute oral mucosa on a substrate of plano-parallel sections of bovine cortical bone modified indenter load/penetration characteristics such that the effects of loads on bone were deferred. In the case of the silicone rubber used, approximately five times the load could be withstood by the bone before it was indented than if no overlay was used. The thicker the overlay the more of the energy applied was absorbed in deforming the intermediary layer. Experimental results confirm that oral mucosa is a modifier of direct loads falling on bone and give some indication of their magnitude.

Animals↗
PubMed1989

The qualitative assessment of cobalt-chromium castings for partial dentures.

Criteria for objective assessment of cobalt-chromium castings have been developed. A random sample of 21 commercial dental laboratories specialising in the production of cobalt-chromium castings was selected. Identical casts and instructions for the construction of a lower partial denture framework were sent to each of them. The resultant castings were assessed according to specific criteria relating to detailed design features. Only one laboratory produced a casting which conformed completely with the design instructions. Significant defects were found in a high proportion of castings. The range of charges was from 28 pounds to 85 pounds. The results of the qualitative assessments suggest only a very weak relationship between laboratory charges and the quality of cobalt-chromium castings. Suggestions are made for minimum standards that may be applied in clinical practice.

Chromium Alloys↗