Biomedical subjects

U R Darbar

Publications and source records attributed to U R Darbar.

6 recordsLinked to original sources

PubMed1994

Denture fracture--a survey.

The fracture of dentures is an unresolved problem. Despite increasing costs incurred by the nation on the repair of these prostheses, very little has been documented on the type of fracture encountered. This survey was carried out to determine the prevalence of type of fracture by the distribution of questionnaires to three different laboratories. Results obtained showed that 33% of the repairs carried out were due to debonded/detached teeth. Twenty-nine per cent were repairs to midline fractures, more commonly seen in upper complete dentures. The remaining 38% were other types of fractures, the majority of which constituted repairs to upper partial dentures. The latter involved detachment of acrylic resin saddles from the metal in metal based dentures and the fractures of connectors in the all-acrylic resin partial dentures.

Acrylic Resins↗

PubMed1994

Stress analysis techniques in complete dentures.

The fracture of acrylic resin dentures remains an unresolved problem. It is known that eventual fracture of an appliance occurs due to crack initiation and propagation from areas of high stress concentration. In order to understand and overcome the problem of fracture, it is important to identify the regions of stress concentration. A number of different methods are used in stress analysis. However, the finite element method, a numerical technique, appears to overcome most of the problems associated with the earlier experimental methods. This article reviews the different techniques and their application to examining stresses in dentures.

Birefringence↗

PubMed1994

The treatment of palatal erosive wear by using oxidized gold veneers: a case report.

Eight maxillary anterior teeth with severe palatal erosion in an anorexic patient were restored with oxidized gold veneers and without tooth preparation. Because of the extensive exposure of dentin, a cement based on 4-methacryloxyethyl trimellitate anhydride was used as the luting agent.

Acrylic Resins↗

PubMed1993

Multiple external root resorption. Case report.

A case of a patient with multiple external root resorption affecting principally the molars and premolars is described. This case is unusual in that although both right and left molar and premolar teeth are involved, the resorption is worse on the left side and affects only the distal roots of the molars.

Adult↗

PubMed1993

The tooth-denture base bond: stress analysis using the finite element method.

Although acrylic resin teeth are the most popular artificial teeth used for denture construction, a high number fracture away at the tooth-denture base interface. Various causes have been documented for this failure; however, it is logical that eventual fracture occurs due to localised tensile stresses at this interface. Examination of these stresses using the finite element method showed that on load application to the upper incisors, the maximum tensile stresses were concentrated within the body of the tooth and not at the tooth-denture base interface. Stresses encountered at the interface were relatively low and introduction of a crack made no significant difference to their magnitude.

Acrylic Resins↗

PubMed1993

The periodontal abscess--a case report.

Determining the causative factors of dental abscesses continues to tax the diagnostic skills of clinicians. A case is discussed of an unusually presenting chronic periodontal abscess involving the bifurcation of the upper left first premolar.

Bicuspid↗