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Biomedical subjects

R G Oliver

Publications and source records attributed to R G Oliver.

At least 55 records · Page 3Linked to original sources
PubMed1988

The effect of different methods of bracket removal on the amount of residual adhesive.

The amount of residual adhesive following three different methods of bracket removal was examined. The effects of tooth position, bracket base type, and composite mix were also examined. It was found that there was a nonsignificant trend for more composite to remain on upper anterior teeth and a highly statistically significant difference between a paste/paste and paste/liquid composite mix. Bracket base type showed no significant difference. One method of bracket removal resulted in significantly less composite remaining than the other two methods.

Acrylic Resins↗
PubMed1988

An 'invisible' supernumerary tooth.

A case is reported of an unerupted maxillary supernumerary tooth, apparently undergoing resorption, which was not visible on extra-oral radiographs, but was clearly visible on an intra-oral occlusal radiograph.

Adult↗
PubMed1988

The effects of differing acid concentrations, techniques and etch time on the etch pattern of enamel of erupted and unerupted human teeth examined using the scanning electron microscope.

The effects of varying acid concentration, etch time and agitation, on the etch properties of enamel from unerupted and erupted human teeth, were examined using the scanning electron microscope. Results showed that whilst there are differences in behaviour between erupted and unerupted enamel when conditions are varied, under most circumstances unerupted enamel will behave in a similar manner to erupted enamel. With low acid concentration both the duration of etch and agitation seem to be important factors in producing a roughened surface. It is suggested that the manufacturers' recommendations be more precise for a new low acid concentration orthodontic bonding package.

Acid Etching, Dental↗
PubMed1987

The effects of differing etch times on the etch pattern on enamel of unerupted and erupted human teeth examined using the scanning electron microscope.

The etch pattern produced on enamel from unerupted and erupted human teeth with varying periods of acid etching using 37 per cent phosphoric acid was examined using a scanning electron microscope. For erupted enamel etch scores were fairly consistent above 10 seconds etching, for unerupted enamel etch scores matched those for erupted enamel for etch times above 30 seconds. The etch type was more consistent on unerupted enamel.

Acid Etching, Dental↗
PubMed1986

Tongue size, oral cavity size and speech.

Methods of measuring tongue size are evaluated, and protruded tongue size is related to sex, malocclusion, and speech. Significant correlations are found with sex and speech.

Adult↗
PubMed1985

Attitudes to orthodontic treatment.

A survey of the attitudes of patients and parents to active orthodontic treatment was undertaken at two centres. Questionnaires were distributed which enquired about pre-treatment appearance, reactions to the proposed treatment, experiences during treatment, perceived benefits of treatment, and values placed upon treatment. The results indicated that both patients and parents were satisfied with the treatment received, and pain from the appliance and its appearance were the main discouraging features.

Adolescent↗
PubMed1984

Occupation and blood pressure.

Australian-born men in low-status occupations have, on average, higher blood pressures than those classified as professional or technical workers, according to the results of a national survey carried out by the National Heart Foundation and the Commonwealth Department of Health, Australia, in 1980. The expected correlations between age, alcohol consumption, body mass, and blood pressure were found. The association between occupation and blood pressure persisted after statistical adjustments for differences in age, obesity, and self-reported alcohol consumption. Though small, the differences in group averages are statistically significant, and suggest the potential for differences of cardiovascular morbidity for workers in different occupations. These findings are consistent with similar gradients in occupational mortality reported in Australia and elsewhere. It is likely that these effects are related to work, both through neuroendocrine stress mechanisms associated with certain job characteristics and through job-determined adverse health-related behaviour. The public health and preventive significance of such associations is stressed.

Adult↗
PubMed1984

Biorhythms and tests of oral skills.

The null hypothesis that there is no difference in an individual's level of skill on critical and non-critical days of the biorhythm cycle is tested over a 2-week period using oral stereognosis and a dysarthria assessment. No statistical evidence could be found to refute the null hypothesis proposed and it is concluded that there is no relationship between oral skills and stages of the biorhythm cycle.

Adolescent↗