Biomedical subjects
Publications and source records attributed to M J Barsby.
There are good reasons for supposing that the problem of 'gagging' for some patients is analogous to a panic attack and is best understood from a cognitive perspective. In my experience, teaching patients to acquire a relaxed abdominal breathing pattern can provide a useful coping strategy for some individuals with a 'gagging' problem.
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.
An anxious patient may experience an uncontrollable increase in ventilatory effort, far in excess of the body's metabolic needs, to such a degree that profound changes are induced in the cardiovascular and neurological systems. This abnormal drive to breathe rapidly leads to a reduction in the tension of carbon dioxide in alveolar gas and arterial blood and to mild alkalosis. The outward expression of these disturbances can be alarming for both patient and dentist, but for the physiologist searching for underlying mechanisms it is intriguing. The cursory coverage of this subject in some textbooks and lecture courses is regrettable when one considers that hyperventilation is not uncommon in a dental patient. This article examines the causes, signs, symptoms and management of acute hyperventilation.
A 50% sample (N = 100) of all patients aged between 50-70 years at the time of treatment who received RPDs' were interviewed by telephone for 8-10 minutes. The questionnaires evaluated the subjects' denture experience, attitudes to dentures, and satisfaction with them. A large majority were satisfied with their RPD's but a higher proportion of women reported problems with mandibular RPD's. About one third of the group had not returned for recalls. Statistically significant relationships were found which suggested that subjects who were satisfied with their previous dentures were more likely to be satisfied with their replacements, and subjects who removed their RPD's to eat were likely to be dissatisfied with them.
Hypnosis is not a therapy, but can provide the clinician with a set of techniques which may be used to augment or facilitate a particular course of treatment. The importance of the patient's history and clinical findings in the diagnosis of intolerance to dentures and the selection of patients for hypnosis is discussed. Principles of treatment using relaxation, anxiety control, conditioning/desensitisation and confidence boosting techniques are described. Some examples of typical case histories are used to illustrate the application of a variety of techniques that have been found to be successful.
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The aim of this study was to investigate poly(isobutyl methacrylate) as a potential denture base material. It was found to have very low water absorption but poor mechanical properties and a low glass transition temperature. The latter features render the material itself unsuitable for use as a denture base material, but indicated that isobutyl methacrylate may be a useful co-monomer for reducing water absorption.
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.
Self-inflicted tooth modification other than ritual mutilation practised in some countries is a rare occurrence. The author reports a case of aggravated loss of tooth structure where a patient has contributed to loss of tooth structure by the novel method of adjusting his natural teeth with a 'knife'. Subsequent management of the case is discussed.
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A number of pour-type denture base resins were found to have low glass transition temperatures, indicating a propensity to thermal distortion. These low transition temperatures reflected high residual monomer contents. Furthermore, such materials exhibited high mechanical loss tangents, consistent with high creep rates observed previously.
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