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Biomedical subjects

A S Richardson

Publications and source records attributed to A S Richardson.

At least 19 recordsLinked to original sources
PubMed1990

Clinical evaluation of glass ionomer-silver cermet restorations in primary molars: one year results.

Using the half mouth technique, 33 silver amalgam (Dispersalloy) and 40 glass ionomer (Ketec silver) restorations were placed in the primary molars of children aged five to seven years. After one year, 73 restorations were evaluated. The amalgam restorations rated 90-100 per cent alpha for anatomic form and margins with no recurrent caries or fractures. The glass ionomer restorations rated 35 to 55 per cent alpha for anatomic form and margins with 40 per cent being replaced due to fracture of the material. Within the guidelines of this study, glass ionomer silver cermet was not a suitable material for the restoration of interproximal cavities in primary molars.

Cermet Cements↗
PubMed1989

Clinical evaluation of a restoration containing fluoride: two-year results.

Fluoride-containing restorations were placed on the distal surface of primary second molars to evaluate their effectiveness in controlling caries on the mesial surface of the approximating permanent first molars. A half-mouth study design was used with the control primary second molars in the same arch, either restored with amalgam or left sound. After two years, radiographs of 56 pairs of permanent first molars in 48 children were evaluated independently by three examiners blind to whether they were examining study or control surfaces. In 15 matched pairs, the study restoration had the effect of preventing a carious lesion on the mesial surface of a permanent first molar. In six matched pairs, the study restoration had the effect of not preventing progression of a carious lesion on the mesial surface of a permanent first molar. In 35 matched pairs, there was no effect observed. At the two-year evaluation, the study restorations with added fluoride controlled caries progression significantly on the adjacent mesial surfaces of permanent first molars when compared to the controls using the Sign test (P less than 0.05).

Child↗
PubMed1977

Caries-preventive effect of two concentrations of stannous fluoride mouthrinse.

The effectiveness of a stannous fluoride mouthrinse, when used once each school day, was investigated in a 3-year study. Effervescent stannous fluoride tablets of two concentrations were dissolved in 20 ml of water, giving solutions of 100 parts/10(6)F- and 200 parts/10(6)F- respectively. Approximately 1,200 children, with a mean age of 10 years, were divided on a random basis into three groups. Two of the groups rinsed with the two strengths of solution and the third group rinsed with a placebo. Examinations were carried out at the commencement of the study, and at yearly intervals thereafter. The final series was carried out a year after the rinsing procedures were terminated. There were significant reductions in the numbers of new caries in each of the two experimental groups as compared with the controls. The concentration of the solutions appeared to have little influence on the results. More dramatic reductions were noted in the teeth which erupted during the course of the study. A residual effect was demonstrated a year after the rinsing procedures were terminated.

Child↗
PubMed1977

A correlation study of diet, oral hygiene and dental caries in 457 Canadian children.

The interrelationship of diet, oral hygiene and caries was evaluated. Of the sample size of 457 children, 234 were in grade 1 and 223 grade 7. Five-day diet surveys were obtained, followed by clinical examinations for oral hygiene and caries. One examiner, using mouth mirror, explorer and extraoral light, conducted the caries examination. From the diet surveys, refined and total carbohydrate consumption was calculated per day; between meals, at meals, and totaled for the day. Five-day totals, which included one weekend, were recorded along with frequency of eating per day and for the 5-day periods. Computer analysis revealed no significant correlation between the diet variables and caries or oral hygiene indices and caries. The children with high caries indices did not have the poorest oral hygiene nor consume the most carbohydrates. Similarly, the children with low caries indices did not have the cleanest teeth nor consume lesser amounts of carbohydrates.

Adolescent↗