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Biomedical subjects

D S MacDonald-Jankowski

Publications and source records attributed to D S MacDonald-Jankowski.

32 records · Page 2Linked to original sources
PubMed1993

Taurodontism in a young adult Chinese population.

The first and second molars on the panoramic radiographs of 196 consecutive 15-19-year-old Chinese adults (male:female ratio; 46:54) were assessed in order to establish the prevalence of taurodontism, which is considered to be a marker of underlying genetic disease. The criteria of Shifman and Chanannel (Community Dent Oral Epidemiol 1978; 6: 200-3) were employed and the measurements made digitally. Taurodontism was present in 46.4% of patients in this series with a greater prevalence in females (56% compared to 36% in males, P < 0.001). It was found in 21.7% of all teeth examined, and the prevalence was significantly greater in females (26% for compared with 17.4% in males, P < 0.001). Our results suggest that taurodontism is not sufficiently sensitive to be a marker of genetic disease in Chinese.

Adolescent↗
PubMed1993

Mucosal antral cysts in a Chinese population.

Although mucosal antral cysts (MACs) are a frequent finding in surveys of panoramic radiographs in several western populations, its prevalence has not been reported in an oriental population. The panoramic radiographs of two sets of 1000 consecutive patients attending the University of Hong Kong Dental School in 1981 and 1990 were reviewed. The mean prevalence of MACs was 5.2% and they were twice as frequent in males. There was no significant difference in either the prevalence or the mean area of the MACs in patients with periapical bone loss and/or complaining of pain and swelling arising from dental disease in the adjacent maxillary alveolus when compared with those without. It is concluded that the prevalence and presentation of MACs in this oriental population is broadly consistent with that reported in western populations.

Adolescent↗
PubMed1992

The involvement of the maxillary antrum by odontogenic keratocysts.

The involvement of the maxillary antrum by an odontogenic keratocyst is an unusual presentation of this important lesion which shows a tendency to recur following surgery when it arises in the mandible. The clinical presentation and radiological appearance in five patients are described. The differential diagnosis of this lesion is briefly reviewed.

Adult↗
PubMed1992

The effect of thin K-edge filters on radiation dose in dental radiography.

The use of thin K-edge filters has been found to reduce considerably the radiation dose in intra-oral radiography. The aim of this study was to investigate the effect of filtration on the skin entrance dose and several sites (representing organs or areas of interest within the head) along the central beam axis, at other points within the primary beam and at two points just outside the primary beam. The subject was a sliced head phantom (a human skull embedded in tissue-equivalent material) which was exposed to X rays from a conventional dental X-ray unit in the range of tube voltage 55-85 kVp for each of four filter systems. These were 2.7 mm of aluminium alone (the existing total filtration) or with an added 0.1 mm erbium, 0.1 mm yttrium or 0.05 mm niobium metal foils. Measurements of radiation dose were made using thermoluminescent dosemeters (TLD rods) and were adjusted to simulate the exposure resulting from a typical dental radiograph of a maxillary molar. The results suggest that the use of thin K-edge filters significantly reduces the entrance skin dose and to a certain extent reduces the total dose imparted to the head. However, the dose to the ipsilateral orbit at higher tube voltages may be increased.

Aluminum↗
PubMed1991

The detection of abnormalities in the jaws: a radiological survey.

The dental panoramic tomographs of 1000 casual patients attending the Dental Casualty Department of King's College School of Medicine and Dentistry were screened for pathology. The findings are compared with a similar survey conducted 17 years ago at the same institution. The improvement in dental health nationally over this period is not reflected in the findings of this survey.

Adult↗
PubMed1991

The reduction in radiation dose for intra-oral radiographs by the use of thin K-edge filters.

The aim of this investigation was to reduce the radiation dose to patients undergoing intra-oral dental radiography by using thin K-edge filters in addition to the existing aluminum filter. The subject was a head phantom (a human skull embedded in tissue-equivalent material), which was exposed to X rays over a range of tube voltages (50-90 kVp) for each of the four filter systems. These were 2.7 mm aluminium alone (the existing total filtration) or with added 0.1 mm erbium, 0.1 mm yttrium or 0.05 mm niobium. The radiation dose was measured at four selected sites along the primary beam. These were the entrance skin dose, the exit skin dose and intra-orally both in front and behind the dental film packet. The exposure times and radiation doses required to produce an equivalent density (degree of blackening) on a radiograph of an upper molar tooth were determined. Within the usual diagnostic range of 60-80 kV the use of the thin K-edge filter resulted in a doubling of the exposure time (owing to the additional attenuation of the added filters). However, the skin dose and the total dose imparted to the patient were significantly reduced.

Humans↗
PubMed1991

Multiple dental developmental anomalies.

An unusual case is presented of three dental developmental anomalies, a hypomaturation-hypoplastic with taurodontism form of amelogenesis imperfecta, hypodontia of the premolars and an odontoma, occurring in an otherwise normal boy.

Abnormalities, Multiple↗
PubMed1991

An unusual presentation of a high-grade, non-Hodgkin's lymphoma in the maxilla.

A case of a high-grade, non-Hodgkin's lymphoma affecting the maxillary alveolus which exhibited the classical radiological features of a malignant lesion occurring in the jaws is presented. CT demonstrated considerable upward displacement of an expanded but intact antral floor. Such a feature is more usually suggestive of involvement of the antrum by a benign lesion arising within the alveolar bone.

Adult↗