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Biomedical subjects

R M Basker

Publications and source records attributed to R M Basker.

At least 19 recordsLinked to original sources
PubMed1998

How well are complete dentures copied?

OBJECTIVE: To assess how accurately the same set of complete dentures could be copied by 12 different laboratories. DESIGN: A prospective study. SETTINGS: Completed by commercial laboratories used by GDPs in England (1996). Results were analysed and controlled by a university department. SUBJECTS (MATERIALS) AND METHODS: The master set was constructed to include a midline diastema and a bilateral posterior crossbite. Twelve sets of silicone moulds of the master denture were prepared. GDPs selected commercial laboratories of their choice to receive the work. MAIN OUTCOME MEASURES: All stages of the work were compared with the master dentures by returning them to a specially adapted articulator. Analysis was completed using preset criteria. RESULTS: Only five of the returned copies were considered to have both good quality acrylic resin work and clear details of the teeth in wax. Only four cases reproduced the diastema. After processing, the occlusal vertical dimension had been increased in eight of the cases and the bilateral crossbite had been eliminated in all cases. CONCLUSIONS: None of the final copy dentures were considered an accurate copy of the master dentures. There is considerable scope for further training of dental technicians in this important technique.

Acrylic Resins↗
PubMed1996

Preparation of guide planes using a reciprocating handpiece.

A reciprocating handpiece and attachments have been found effective in preparing guide planes prior to the construction of removable partial dentures. A comparison was made of the enamel surface prepared using the reciprocating handpiece and a conventional rotary handpiece. Two-stage and three-stage techniques for each handpiece were compared. Scanning electron micrographs showed that a smoother surface was created by the reciprocating handpiece.

Bicuspid↗
PubMed1996

Removable partial denture design in Alberta dental practices.

Studies published in the dental literature have found, all too frequently, that dentists do not pay adequate attention to the design of cast removable partial denture frameworks. This study investigated removable partial denture design in Alberta dental practices. The authors considered various issues related to surveying, partial denture design, and provider education, as well as the possible collaboration of clinical dentistry with denturism in removable partial denture treatment. Although the study found that a significant proportion of Alberta's dentists get involved in designing the cast framework, relatively few undertake surveying. Instead, surveying tends to be deferred to dental technicians. As was the case in other studies, no clear reason for this trend emerged, and it appeared to be unrelated to remuneration or time utilization issues. Responding dentists perceived that their undergraduate education was adequate for providing removable partial denture care. The study also identified a need for small, hands-on continuing education courses. About half of the respondents indicated that it is appropriate for dentists to collaborate with denturists on complete denture care. However, very few respondents considered it appropriate to refer to, or collaborate with, denturists in removable partial denture care.

Alberta↗
PubMed1996

The development of a simple test method to characterise the compliance and viscoelasticity of long-term soft lining materials.

A simple test, based on the measurement of depth of penetration, has been devised to characterise long-term soft lining materials. Inter-laboratory testing has shown the method to be reproducible and to be capable of comparing and contrasting the compliance and viscoelastic behaviour of commercially available materials. Additional results emphasise the point that it is imperative to control the testing temperature, especially for the soft acrylic materials.

Acrylic Resins↗
PubMed1995

Problems in restorative dentistry: who copes with them?

The views of general dental practitioners, practising in part of the Yorkshire Region, as to how they would cope with a variety of restorative problems were sought using a questionnaire. If advice or advice and treatment were to be requested from a consultant in restorative dentistry, the questionnaire was designed to discover whether the distance from a hospital created a barrier to the preferred course of action. Only one-third of the dentists were happy to treat a troublesome complete denture case, provide a replacement obturator or look after a natural dentition with considerable periodontal problems. Travel constraints were particularly apparent when it came to seeking help for the elderly edentulous patient. The results of the study indicate that in the Yorkshire Region, there is a high level of demand for consultant advice and treatment for a number of common restorative problems.

Adult↗
PubMed1995

A new temporary soft lining material.

The viscoelastic properties of a new light-activated temporary denture soft lining material have been monitored in vitro using a force/distance probe. Its baseline behaviour was characteristic of an elastic material and its compliance considerably less than that of both a short-term and a long-term soft lining material which were used as controls. Sample thickness had no appreciable effect on this compliance. These results suggest that the new product is likely to be perceived as being significantly harder by a patient. Twenty-four weeks' immersion in distilled water had no significant effect on either the compliance or elasticity of the test material and would suggest an improved durability when compared to other conventional short-term resilient denture lining materials, albeit at the expense of compliance.

Compliance↗
PubMed1995

Long-term soft lining materials--the relationship between prosthodontic opinion and compliance.

This study investigated the relationship between expert prosthodontic opinion of the suitability of long-term soft lining materials and compliance, as measured by depth of penetration measurements. It showed that there was very good agreement between subjective assessment and objective measurement. Opinion on satisfaction ranged from 82.4% for a heat-cured silicone to 10.8% for a heat-cured soft acrylic which had been stored in water for four weeks. The findings make it possible to set realistic values for a standard test of compliance. The results for depth of penetration allow valuable information to be given to the clinician as to the varying compliance of long-term soft lining materials.

Acrylic Resins↗
PubMed1995

Removable partial denture design habits in general dental practice in Sweden.

An investigation was made concerning Swedish general dental practitioners' habits in removable partial denture design and their opinion of the undergraduate training programme in this matter. The investigation showed that many dentists failed to provide adequate prescriptions and that they relied heavily on the dental technician for partial dental design. A clear majority of the participants, educated at Umea dental school, considered the undergraduate training programme to be adequate, whilst a similar percentage educated at Gothenburg dental school was dissatisfied. The faculties in Stockholm and Malmo were placed between Umea and Gothenburg in this respect. The majority of the participants in this survey declared that the opportunity to attend small group postgraduate courses in the subject was desirable. A prerequisite for dentists to have control of the treatment they are responsible for, is that they at least have the necessary knowledge. This knowledge may have to be achieved after qualification instead of during their undergraduate training.

Attitude of Health Personnel↗
PubMed1994

The influence on partial denture design of a teaching video for general dental practitioners.

This evaluation was based on replies from a random sample of general dental practitioners who were asked to complete questionnaires before and after being sent a video and accompanying booklet on partial denture design. Forty per cent (257) of the original sample (636) completed and returned both questionnaires. A total of 212 respondents (82%) felt the video had been of value and 175 (68%) said they would be more likely to provide metal partial dentures after having watched it. The positive effects of the video were greatest amongst the most recently qualified. Despite some improvement after watching the video, there remained 105 (40%) who indicated that they would leave all partial denture design decisions to the technician on at least some occasions. Comparison of data from first and second questionnaires showed little evidence of substantial shifts in choice of denture design for a series of specific situations. It was concluded that whilst the programme had been well received and had produced changes in intention, there was less objective evidence of change.

Acrylic Resins↗
PubMed1994

Disposable trays for complete denture construction: a dimensional study of a type frequently used in the UK and of its suitability for the edentulous population.

This study compares the sizes of patients' edentulous arches with the shapes of a range of disposable stock trays from one manufacturer. In many dimensions there is considerable discrepancy between the two. It is concluded that, even with tray modification, it is almost impossible to obtain an accurate impression of the shape of the all-important sulcus regions. Such a conclusion emphasises the importance of obtaining further impressions in special trays which are modified appropriately.

Dental Impression Technique↗
PubMed1994

Evaluating materials used for constructing soft earmoulds.

The use of penetrometry for the assessment of materials employed for soft earmoulds is investigated. Selected test conditions are used for the characterisation of 10 materials of five types (cold-cured methacrylate, heat-cured methacrylate, heat-cured silicone, polyvinyl chloride co-polymer and polyethylene copolymer) used in clinical practice. The results are compared with the outcome of subjective assessments surveyed for four representative materials. The effect of ageing is assessed for a heat-cured silicone (Molloplast B) and a heat-cured methacrylate (Coe Super-Soft).

Evaluation Studies as Topic↗
PubMed1994

Check records--a chairside mounting procedure.

This article considers the logistical problems involved when the check (interocclusal) record procedure is used to remount complete dentures on an articulator. It reports the development of upper and lower "check record mounting blocks" that may be made to fit any articulator, thus enabling the procedure to be performed easily and quickly at chairside.

Dental Articulators↗
PubMed1993

Complete denture prescription--an audit of performance.

The quality of clinical records obtained during the various stages of complete denture construction was assessed in a survey conducted in five large dental laboratories in 1989. The most common fault in approximately half of 188 upper and 158 lower impressions was overextension in the labial and buccal sulci. Of the 87 occlusal records examined, the rims indicated the intended incisal relationship in about 50% of cases. The border of the eventual denture was defined by the technician rather than by the dentist in most instances. The post-dam was prescribed by the dentist in only 16% of the 50 trial dentures inspected. It is argued that a major cause of the lack of prescription is the level of the NHS fee, coupled with the fact that the laboratory expenses are deducted from that fee.

Communication↗
PubMed1993

A survey of the dissatisfied denture patient.

A small but important group of complete denture wearers find great difficulty in adjusting to, and wearing, dentures. In the past, efforts have been made to identify a factor or group of factors which typify these patients so that the clinician, having recognised the factors, might modify the management approach accordingly. Most research has concentrated on one form of investigation. In this study a wide range of tests was applied to complete denture wearers attending for treatment at Cardiff or Leeds Dental School, including an exhaustive interview and questionnaire, clinical examination and a personality assessment. In the majority of cases technical errors in denture construction accounted for the presenting complaint. It was not possible to identify a factor or group of factors common to those patients who had suffered chronic denture problems.

Adult↗
PubMed1991

Tongue control of upper complete dentures: a clinical hint.

The role of the tongue in aiding upper denture retention is well recognised by clinicians, but this information is not always related to the patient. This paper describes a simple method of diagnosing the problem and training patients to control their maxillary denture during function, particularly when chewing food.

Denture Retention↗
PubMed1989

The role of overdentures in gerodontics.

As more people keep their teeth later in life, more and more patients in the future will still be partially dentate at an age when, previously, the edentulous state was the norm. The overdenture has a part to play in restorative dentistry for these patients. It can be a relatively simple, inexpensive prosthesis; but, like so many other aspects of dentistry, will provide long-term success only if the patient and the mouth have been assessed with care and a rigorous after-care programme instituted.

Aged↗