Biomedical subjects
Publications and source records attributed to I E Barnes.
This article explains the educational policy decisions that lay behind the development of a teaching and training programme of integrated dentistry at the Dental School at Newcastle upon Tyne. The development and organisation of a specially designed clinic is described. The pattern of work undertaken during the first 2 years of operation is analysed and the means of clinical assessment of this work discussed.
Adhesion of tooth-coloured restorative materials to the instruments used to place them is a clinical problem. This paper examines the low-stick properties and the durability of a 5 micron coating of titanium nitride on stainless steel when used with two composites (a hybrid and a microfilled) and a glass polyalkenoate (ionomer) cement. Titanium nitride-coated dies were compared to polished stainless steel for adhesion to the unset restorative material before and after a period of wear, and also for properties of surface hardness, contact angle with unfilled resin and frictional coefficient. The results demonstrated that, while the coated instruments were significantly harder and showed a lower coefficient of friction and a higher contact angle with resin, they were slightly 'stickier' than highly polished stainless steel, and this difference persisted even after wear. However, the material is very hard, resistant to damage, and appears to have little potential to discolour the restorative materials with which it is used. It is concluded that a titanium nitride coating confers no additional advantage as regards low-stick properties, over clean, polished stainless steel used for dental instruments.
A case is reported of severe loss of alveolar bone in the maxilla, as a result of leakage into the tissues of an arsenical paste from the pulp chamber of an endodontically 'treated' tooth. The history of the use of arsenic in dentistry is discussed, as are the hazards inherent in the use of this outmoded and dangerous medicament.
A preliminary scanning electron microscope (SEM) study was carried out to investigate how the adaptation of two calcium hydroxide bases (one chemically cured, one light cured) was affected by the polymerization contraction of a supervening light-cured composite resin restoration. Occlusal cavities were prepared in 40 sound extracted human premolars, divided into two equal groups. In the first group a chemically cured calcium hydroxide (Dycal, De Trey Dentsply, Konstanz, FRG) was placed as a base. In the second group a new light-cured calcium hydroxide product (Prisma VLC Dycal, De Trey Dentsply) was used. The restorations were completed with an acid-etched, incrementally placed composite resin. The specimens were sectioned vertically and debrided. A replica was made of each half-tooth. The interfaces between composite resin/base and base/dentine were viewed and photographed in the SEM. The marginal adaptation at these two interfaces was classified into three categories according to the extent of the gaps that were observed. Prisma VLC Dycal base was found to be pulled away from the dentine floor of the cavity as a result of an apparent adhesion to the composite resin during polymerization contraction. Dycal was better adapted to the cavity floor than Prisma VLC Dycal. Disorganization of the resin-bonded Prisma VLC Dycal was minimal even after acid etching the enamel, sectioning and ultrasonic debridement. Dycal appeared to be more friable, and occasionally exhibited marked disorganization as a result of these procedures.
Calcium hydroxide is a material which has been used for a variety of purposes since its introduction into dentistry in the early part of the twentieth century. In its pure form, the substance has a high pH, and its dental use relates chiefly to its ability to stimulate mineralization, and also to its antibacterial properties. A range of products has been formulated with different therapeutic actions, the effects of which are partially dependent upon the tissue to which they are applied. The material is reviewed under the following general headings: biochemical actions; dental formulation; uses.
The People's Republic of China is increasingly becoming open to the West, and a number of visits have recently been, and are about to be, made by British dentists. In November 1988, the authors of this report made a 2-week lecture tour, under the auspices of the Health Co-operation Agreement between the Department of Health (UK) and the Chinese Ministry of Public Health, organised by the British Council. The principal base for the visit was the Institute of Geriatrics at the Beijing Hospital, where seven lectures were given. Further lectures and seminars were given to staff and postgraduate students at the Fourth Military University in Xian.
Closed circuit television has been used in the Department of Operative Dental Surgery of the University of Newcastle-upon-Tyne since 1966. The medium has played an increasingly important role in the teaching of technique courses, especially after 1978 when the large 80-place teaching laboratory of the newly-built Dental School was commissioned.
Proper planning of a course of treatment for the older patient will form the basis of success. Treatment planning is a stringent test of clinical acumen: requiring consideration of what the patient desires, what the patient can tolerate and what can be achieved. In this article the authors outline the principles of treatment planning for the ageing patient.
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Explore the source record for details and available documents.