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Biomedical subjects

N H Wilson

Publications and source records attributed to N H Wilson.

At least 73 records · Page 4Linked to original sources
PubMed1998

A retrospective evaluation of a series of dentin-bonded ceramic crowns.

OBJECTIVE: This study assessed the clinical performance of dentin-bonded crowns, in which ceramic crowns are bonded to underlying dentin with a resin composite-based luting material and a dentin bonding agent. METHOD AND MATERIALS: Twenty-five patients who had received such restorations more than 1 year previously were recalled for evaluation of their crowns. RESULTS: Sixty dentin-bonded complete-coverage restorations were assessed. Forty-one of the crowns had been placed on incisor teeth. The mean time since placement of the restorations was 2.43 years. Fifty-seven of the 60 restorations were intact. The three failures had resulted from cracks in the restorations, which had not clinically debonded. No secondary caries was detected at the crown margins, and anatomic form was assessed as excellent for 56 crowns. Root canal treatment had been required in one case. Color match was rated very good for 47 crowns. All 25 patients were satisfied with their restorations. CONCLUSION: Dentin-bonded crowns may be found to have a low rate of failure and to provide a high level of patient satisfaction.

Adult↗
PubMed1998

When is caries caries, and what should we do about it?

Treatment of initial caries, albeit an everyday occurrence for the dental practitioner, presents considerable demands of patient assessment and diagnosis. Whatever decisions are made--to restore caries or to attempt to arrest its progress--the adoption of a maintenance program is of paramount importance. Patient motivation, in respect to dietary control and satisfactory oral hygiene, is central to a successful outcome, and in the future, practice management programs may include RAC as a diagnostic aid. New methods of caries management are more dynamic than traditional methods and place restoration of the lesion toward the bottom of the list of possible treatments, with the biologic rather than the mechanistic approach being a priority. However, the teaching of RAC in dental schools and the third-party funding of diagnostic tests and diagnosis are also required to reflect the increasing complexity of management of initial caries. If restorative intervention is indicated following diagnosis and RAC, treatment of initial caries should involve a minimal-intervention adhesive technique.

Decision Making↗
PubMed1998

Impression materials and techniques for crown and bridgework: a survey of undergraduate teaching in the UK.

The aim of this study was to document the teaching of impression materials and techniques for crown and bridgework in the undergraduate curriculum in UK dental schools. A questionnaire sent to each school during the 1993/1994 academic year elicited fourteen replies (100% response). Addition-cured silicones were found to predominate; 71% of schools taught and used clinically a one-stage, full arch impression technique involving stock trays, and 57% of schools a full-arch custom tray technique. Routine disinfection of impressions was taught and practised in 43% of schools. The results demonstrated variation between UK dental schools in their teaching of impression materials and techniques for crown and bridgework in the undergraduate curriculum.

Crowns↗
PubMed1997

Current materials and techniques for direct restorations in posterior teeth. Part 1: Silver amalgam.

This paper, the first of two reviewing materials and techniques for direct intracoronal restorations in posterior teeth, deals with the use of silver amalgam. Based on a consensus view on appropriate applications and contraindications for silver amalgam, the toxicity of amalgam and competing materials, financial implications and international legislation, consideration is given to the continued use of this material. It is concluded that silver amalgam still has a place in everyday practice, albeit restricted in comparison to its former use. Amalgam should only be used where it offers clear advantages over other materials. This requirement for use of silver amalgam will continue until true substitutes are developed and evaluated, alternative materials are optimised and dentists are fully trained in the use of adhesive techniques.

Adhesives↗
PubMed1997

Dentists' attitudes to the shortened dental arch concept.

The aim of restorative dentistry in high-risk groups tends to shift over time from the preservation of complete dental arches towards the preservation of functional dental arches, using a functionally oriented approach. An example of this approach, aimed at limited treatment goals, is the shortened dental arch (SDA) concept. The objective of this study was to investigate dentists' attitudes to the SDA concept in general practice. A questionnaire seeking information pertaining to the attitudes and application of the SDA concept in clinical practice was sent to all dentally qualified members of staff in the field of restorative dentistry in the Nijmegen School of Dentistry (n = 64). From a 64% response, it was found that all but one of the respondents view the SDA concept as having a useful place in clinical practice. Although the respondents indicated only regular or occasional use of SDA in < 10% of patients, the outcome of SDA management was generally satisfactory or at least sufficient, notably in the care of special category patients. The findings support the view that the SDA concept has a role in contemporary clinical practice.

Attitude of Health Personnel↗
PubMed1997

Changes of surface texture of enamel in vivo.

There are various methods of measuring tooth wear, including that which could be considered to be associated with acid erosion. However, the present systems are limited in that they require an extended period of study to detect wear and also they do not give any insight as to the underlying mechanism of the tooth tissue loss. The aim of this study was to use a profilometric measuring system analysing novel surface texture parameters normally associated with the automobile industry to describe the wear and run-in behaviour of machined sliding engine parts. The texture parameters selected were the traditional Ra parameter and also parameters derived from the bearing ratio. Analyses of the surface texture of the labial surface of upper central incisors at an interval of three months indicated that the enamel surface was smoother but there were subtle changes occurring to the enamel. There was a statistically significant increase in the depth of pits/pores of the enamel surface, which could be identified as sites of retention of exogenous acid or chelating agent. The effects of acid erosion are not uniform but are dependent upon several factors; the configuration of the enamel surface may play an important part in the mediation of acid erosion type lesions.

Adult↗
PubMed1997

Current materials and techniques for direct restorations in posterior teeth. Part 2: Resin composite systems.

This paper, the second in a two-part review of direct materials and techniques for intracoronal restorations in posterior teeth, deals with resin composite systems. Based on a consensus view on appropriate applications for composites in posterior teeth, consideration is given to the selection of composite systems, indications for posterior composites in different populations, principles for cavity preparation, placement techniques, clinical performance and the use of posterior composites in the context of the changing pattern of dental disease and the need to expand existing knowledge. It is concluded that posterior composites have a place in everyday clinical practice, albeit relatively limited and that the time has come to actively pursue and realise the opportunities afforded by these materials.

Composite Resins↗
PubMed1997

Impressions.

Explore the source record for details and available documents.

Dental Impression Technique↗
PubMed1997

Practice-based research: importance, challenges and prospects. A personal view.

Observation from the 'real-world' environment of dental practice is increasingly recognised to be of importance in the interpretation of research data from academia and dental health services research. In fact, most forms of applied dental research may be undertaken in the dental practice environment. However, in order to contribute to existing knowledge and understanding, practice-based research must be both rigorous and meticulous in its design, and subjected to scrutiny through presentation and publication before being considered to have been successfully concluded.

Clinical Trials as Topic↗
PubMed1997

Reasons for placement and replacement of restorations of direct restorative materials by a selected group of practitioners in the United Kingdom.

This article reports the findings of a study on reasons for the placement and replacement of direct restorations in general dental practice in the United Kingdom. Twenty-two selected practitioners recorded information pertaining to up to 250 consecutive direct restorations placed by themselves during a 6-week period. From data derived from 2,379 restorations, it was found that about 60% of restorative practice in the United Kingdom may be found to comprise the replacement of existing restorations. For restorations of amalgam and glass-ionomer cement, the principal reason for replacement was secondary caries. For restorations of resin composite, secondary caries and poor appearance accounted for equal proportions of failures. Apart from the need for more extensive surveys of the type reported, the data emphasize the need to monitor treatment trends in contemporary clinical practice.

Composite Resins↗
PubMed1997

An emergency dental service for students: 4-year findings.

OBJECTIVE: To describe the arrangements for the provision of emergency dental services for students at the University of Manchester and to report data collected during the first four and a half years of the student emergency dental services (SEDS) unit based at the University Dental Hospital of Manchester. METHOD: Data pertaining to every student attending SEDS since its inception were collected by means of questionnaire including provision to record diagnoses, treatment needs and the emergency care provided. RESULTS: The incidence of dental emergencies within the student population served by SEDS has been found to be 39 emergencies per 1000 students per annum, with the service being most heavily used by overseas students. Caries, pulpal pathology and failed restorations account for 46 per cent of the presenting emergencies, with pericoronitis (19 per cent) and other emergencies of periodontal origin (14 per cent) being common place. CONCLUSION: It is concluded that a student emergency dental service may be found to be an important element of student medical and related welfare services.

Adolescent↗
PubMed1997

Variations in the depth of preparations for porcelain laminate veneers.

The reflex metrograph was used to measure preparation depth for a sample (21) of preparations for porcelain laminate veneers obtained from a large commercial laboratory. Eight (38%) of the teeth investigated were found to be unprepared with 13 (62%) teeth prepared to varying degrees. Five (24%) of the teeth were over prepared with the depth of two preparations exceeding 1.0 mm. There was little evidence that widely advocated guidelines for the preparation of teeth for porcelain laminate veneers had been used. The effect of dentine exposure on the clinical longevity of porcelain laminate veneers remains to be investigated.

Dental Casting Technique↗
PubMed1997

Teaching of all-ceramic restorations in central European dental schools: a survey.

The teaching of all-ceramic restorations in Central European dental schools in the mid 1990s has been surveyed. Based on a 65% response, the findings indicate that the majority of undergraduate (pre-doctoral) students receive instruction in all-ceramic restorations with >75% gaining clinical experience in the use of such restorations prior to graduation. When clinical experience was not received, formal instruction, either in the regular curriculum or in elective studies was generally available. All the schools, with one exception, anticipated that the importance of teaching all-ceramic restorations would increase or at least stay the same. In general, the findings were similar to those reported in studies of the teaching of all-ceramic restorations in North America, Scandinavia, and the UK and Ireland, especially in relation to luting systems, contraindications and finishing instrumentation. However, clinical requirements for all-ceramic restorations in Central European dental schools were more common than in dental schools in North America, Scandinavia and the UK and Ireland.

Clinical Competence↗
PubMed1997

A split-shank prefabricated post system: a critical multidisciplinary review.

A multidisciplinary panel of senior academics and practitioners has evaluated a system of prefabricated threaded split-shank posts (Flexi-Post/Flexi-Flange) from published research and their own clinical use. These posts have been compared with requirements of an ideal post system in relation to clinical use, stress effects, stress distribution, retention, loosening and displacement, provision for cores, and biocompatibility. The purpose was to provide this critical review to allow interested clinicians to compare this novel design to other available post systems.

Dental Prosthesis Design↗