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Biomedical subjects

J F Bates

Publications and source records attributed to J F Bates.

At least 55 records · Page 3Linked to original sources
PubMed1982

Clinical studies of strain behaviour of complete dentures.

This investigation examines the variation in strain on maxillary dentures worm by five subjects in clenching. Strain gauges were attached to each denture in four places. The strain was measured with the posterior teeth in their normal position and then again when these teeth had been moved buccally and palatally. The strain levels varied when the posterior teeth were moved palatally or buccally, but the tension or compression response of the gauges was consistent. The strain level agreed generally with those reported by other workers.

Dental Stress Analysis↗
PubMed1982

Measurement of strain rate behaviour in complete mandibular dentures.

A major cause of fracture in complete lower dentures is due to the denture falling onto a hard floor. Impact failure has never been investigated in complete dentures and in a material which is strain rate dependent, a knowledge of the maximum strain and strain rate at failure is essential if laboratory tests are to evaluate materials in a realistic manner. The work described includes brittle lacquer studies to establish the strain pattern which occurs when a denture is dropped from a height of 1 metre. This was used to orientate strain gauges and experimental dentures were then hit by a specially constructed ram driven at known velocities by a spring, whilst the strain was recorded on a storage oscilloscope. Photographs of the stored wave form were then used to establish the results at ram velocities equal to that of a denture falling 1 metre. Maximum strains were achieved of 11 x 10(3) microstrain and strain rates of 1.04 x 10(3) microstrain/ms. Laboratory impact machines for testing denture materials should therefore be designed to achieve these figures.

Dental Materials↗
PubMed1977

The effect of partial dentures and chlorhexidine gluconate gel on plaque accumulation in the absence of oral hygiene.

A study was made of the effect of wearing partial dentures upon plaque accumulation in a group of 24 partial denture wearers, when oral hygiene procedures were withdrawn. The modifying effect of a 1% chlorhexidine gluconate gel on this plaque accumulation was measured. Plaque accumulation was measured at the end of four different denture-wearing regimens each 3 days in length. The wearing of a partial denture either day only or day and night, significantly increased plaque accumulation over not wearing a denture. There was no significant difference between plaque accumulation with day wear and day and night wear. The increase in plaque accumulation with day and night wear resulted from an equal and significant increase in both buccal and lingual plaque accumulation. Chlorhexidine gluconate in the form of a gel significantly reduced plaque accumulation during daytime wear. These results tend to confirm that plaque control is a major factor in determining the long-term effects of partial dentures upon the periodontal structures and emphasize the importance of oral hygiene in partial denture wearers.

Adult↗
PubMed1976

Masticatory function - a review of the literature. III. Masticatory performance and efficiency.

A review and evaluation of the literature on mastication has been undertaken. Part I discusses the form of the masticatory cycle in the natural and artificial dentitions, including the controversial question of whether tooth contact occurs during function. Part II reviews the literature concerning the speed of movement of the mandible, rate of chewing, and the forces developed in chewing. Part III describes masticatory efficiency and performance, the effect of food on masticatory function, and incorporates a summary of all these three papers.

Adaptation, Physiological↗