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Biomedical subjects

P M Dummer

Publications and source records attributed to P M Dummer.

107 records · Page 6Linked to original sources
PubMed1986

Prevalence of plaque, gingivitis and caries in 11-12-year-old children in South Wales.

The overall eruption and dental disease status of a group of 1015 11-12-yr-old schoolchildren in South Wales is presented. The mean number of teeth erupted was 21.8 with a distribution pattern reflecting continuing eruption of teeth at this age. Almost equal numbers of contralateral and opposing tooth types were present with exceptions including maxillary canines and lateral incisors. DMFT, DMFS, and DFS scores were consistent with other recent studies. The mean plaque score was 2.44 and showed a normal distribution for the group. All children had gingivitis at one or more sites as evidenced by bleeding on probing, and again the distribution pattern was a normal one. The mean pocketing was 1.24 mm and there was little clinical evidence of chronic periodontitis. As expected, plaque and gingivitis showed a very high and significant correlation, with plaque and pocketing and gingivitis and pocketing having lower correlation coefficients which were nevertheless highly significant.

Child↗
PubMed1986

Prevalence of enamel developmental defects in a group of 11- and 12-year-old children in South Wales.

The prevalence of enamel developmental defects was assessed in 579 children aged 11 and 12 yr using the DDE Index. The teeth were dried prior to the examination and a normal dental operating light was used for illumination. Teeth with some type of defective enamel were seen in 48.9% of children. White/single opacities were present in 26.4% of children and white/diffuse, patchy opacities in 9.9% of children. The enamel was abnormal in 5.74% of all teeth with white/single opacities and white/diffuse, patchy opacities occurring in 1.89% and 1.18% of teeth respectively. There was a significantly higher number of teeth affected by enamel defects in boys (P less than 0.01) and boys tended to have a higher prevalence of yellow opacities compared to girls.

Child↗
PubMed1985

Automated thermatic condensation of gutta-percha root fillings in teeth with open (immature) apices.

Forty upper human premolar teeth with open (immature) apices were root filled by one of three methods, namely lateral condensation with sealer, automated thermatic condensation with sealer, and automated thermatic condensation without sealer. The completed root fillings were then assessed for apical defects, apical extrusions, radiographic voids, apical seal and surface adaptation. The majority of the results indicate that the automated thermatic technique without sealer produces marginally better root fillings in teeth with open apices than the other two methods. However, it is impossible to say whether this would confer any clinical advantage on the technique. The authors recommend that clinicians who wish to use the automated thermatic technique for condensing gutta-percha become highly proficient before its use on patients.

Bicuspid↗
PubMed1984

In vitro plaque formation on dental amalgam.

A previously described method for the study of in vitro microbial plaque formation on dental materials has been utilized to assess microbial adhesion and growth on five commercially available dental amalgams. Variations in both the amount and viability of the microbial plaques was found between the various types of amalgams.

Adenosine Triphosphate↗
PubMed1982

In vitro plaque formation on commonly used dental materials.

An in vitro method has been developed for the study of microbial plaque formation on commonly used dental restorative materials. Standard samples of the materials to be studied are suspended in a complex culture medium inoculated with a bacterial suspension. The samples are transferred daily into freshly inoculated medium for a total of 4 days. The resultant microbial plaques are then graded, weighed and assessed for a number of colony forming units (viable count). In this preliminary experiment samples of amalgam, composite cement, gold and porcelain were examined. Significantly less plaque was formed on amalgam than on any of the other materials.

Composite Resins↗
PubMed1980

Dental trauma. Report of a case.

A case of intrusive luxation with accompanying root fracture of a deciduous upper left lateral incisor is described. In this case the separated root apex partly penetrated into and become fused with the permanent successor tooth.

Child↗
PubMed1979

The upper anterior sectional denture.

An upper anterior sectional denture is described which consists of (1) a cast cobalt-chromium framework with two passive clasps that contact undercuts on the distal surfaces of the most posterior remaining teeth and (2) a labial flange that carries the replaced tooth or teeth and engages the labiointerproximal gingival undercuts of the anterior teeth adjacent to the edentulous ridge. The cast framework is inserted occlusogingivally, and the labial flange is inserted labiolingually. Both sections are held together by the frictional resistance of the split post of the framework that fits into a tube on the labial flange and hollowed-out artificial tooth. With this type of prosthesis, certain clinical problems can be handled without abutment tooth preparation and with a minimal amount of chair time.

Adult↗
PubMedDate not supplied

Root canal retained restorations revisited.

The authors published a series of articles which extensively reviewed the current situation in root retained restorations in 1990. This article is intended to update the reader on the advances in this area since the publication of the series.

Humans↗