Raymond B Winstanley

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This study compares the convergence angle of preparations for posterior gold crowns made by fourth/ fifth year undergraduate dental students, clinical teaching staff and general dental practitioners. Sixty dies were cast from impressions previously taken of clinical preparations by clinicians within each of the four groups. Each die was trimmed and(More)
A clinical study was designed to investigate the relationship between intercondylar width (ICW) and inter-dental widths of the upper and lower canines and first molars to aid in denture teeth positioning. The study was divided into two parts so that the results of the first part could be verified in the second part. In the first part, 27 adult subjects were(More)
This review considered the development of glass, ceramic, refractory materials, and techniques over a period of 25,000 years, from the time of stone-age man to their introduction into dentistry. Currently a wide variety of all-ceramic dental restorations are provided using alumina-reinforced, leucite-forming, and novel glass and ceramic materials along with(More)
The quality of impressions for crown and bridge work in seven countries were compared with the results found in the United Kingdom in a previous study. The results showed that metal impression trays were used more frequently, and flexible plastic trays less frequently, in the countries visited than in the United Kingdom. Other differences and similarities(More)
The quality of construction of fixed bridge prostheses directly affects their long-term survival. The cost, alloy composition and marginal fit of bridges made by 30 commercial dental laboratories is assessed. Duplicate models of a three unit bridge preparation were sent to 30 different laboratories, as if required for a patient receiving treatment under the(More)
Identical working models for the construction of a porcelain bonded to metal three unit fixed bridge were sent to 30 different commercial dental laboratories in the United Kingdom. The material was sent from general dental practice addresses with the implication for treatment under the National Health Service. Each bridge on its return was examined for(More)
New methods of delivering educational material are being developed in order to improve effectiveness and efficiency of learning. They are not designed to replace conventional teaching methods, but to complement them and encourage self-directed learning among students. In the present technological age, the use of computers in teaching and learning is almost(More)
A report is presented of a study which was carried out to investigate the standard of impressions for anterior crowns received at a commercial dental laboratory in Great Britain. Aspects examined were the type of tray and its suitability to the impression technique used, fixation of the impression to the tray, the method of storage in transit,(More)
Objective: To determine the quality of impressions for crown and bridge work made in general dental practice.Design and Setting: All impressions for crown and bridge work which had been sent to four commercial dental laboratories in the UK were assessed by two examiners, each laboratory being visited on two occasions.Materials and Methods: 290 cases which(More)
Objective: To evaluate the accuracy of working casts for crown and bridge restorations made from twin mix putty/wash silicone elastomeric impression materials using different types of stock tray.Design: A master cast was made from ivorine teeth in a mandibular model. Three teeth were prepared for full crown restorations to simulate a single unit and a three(More)