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J F Gravely

Publications and source records attributed to J F Gravely.

At least 19 recordsLinked to original sources
PubMed1991

The reliability of the 'Ortho Grid' in cephalometric assessment.

The reliability of cephalometric analysis using the Ortho Grid was assessed and compared with that of traditional tracing, digitization of radiographs and digitization of tracings. A total of fifty lateral skull radiographs were read using each of these methods on two different occasions. Use of the Ortho Grid was found to be the most reliable method in five of the seven measurements investigated.

Cephalometry↗
PubMed1991

The effect of beam collimation in lateral radiographic cephalometry.

A study was carried out to compare the image contrast of lateral cephalometric radiographs taken with and without the modified beam collimation and to evaluate the effect of this on the reliability of cephalometric measurements. The findings indicated that the cephalographs taken with modified beam collimation consistently showed a higher image contrast than the cephalographs taken with standard beam collimation. Despite this, however, there was no significant difference in the reliability of cephalometric measurements between the two groups of films.

Cephalometry↗
PubMed1991

The assessment of antero-posterior dental base relationships.

The reliability and validity of four methods of assessing skeletal pattern (Reidel's method, Eastman correction, Ballard's method, and 'Wits' analysis) from cephalometric tracings have been examined, and the levels of agreement between them investigated. The possibility of the Y-axis length and SN-Y-axis angle having a bearing on the skeletal pattern was also examined. Strong correlation was found between the four methods considered. Ballard's method correlated very closely with Reidel's method, and like 'Wits' method, is not as unreliable as previously reported. Measurement of the SN-Y-axis angle was not found to be of benefit to the assessment of the anteroposterior dental base relationship. Reidel's method, which is the easiest to apply, is recommended as the method of choice, and routine application of the Eastman correction is not recommended.

Cephalometry↗
PubMed1991

Resorption of the crown of an unerupted permanent molar.

This case report describes an unusual phenomenon where resorption occurred in the crown of an unerupted permanent molar. It was an incidental radiological finding. After eruption the tooth was extracted. Histological examination revealed resorption of enamel and dentine, and partial replacement by calcific material. The possible aetiology of the condition is discussed.

Child↗
PubMed1990

AUTO report.

Explore the source record for details and available documents.

Faculty, Dental↗
PubMed1990

A study of need and demand for orthodontic treatment in two contrasting National Health Service regions.

A study has been made of attitudes towards the need for orthodontic treatment and its acceptability to fifth year high school pupils in two regional health authorities in England, selected because of differences in the number of orthodontists practising in the regions and in the amount of General Dental Service orthodontics undertaken in each. The respondents in both regions showed similar levels of awareness to the need for treatment, but treatment was found to be less acceptable to those in the region where less orthodontic appliance therapy was being undertaken. The differences between regions were greater in girls than boys. In both regions, girls were more aware of malocclusions than boys and were more prepared to accept treatment.

Adolescent↗
PubMed1989

Vertical parallax radiology to localize an object in the anterior part of the maxilla.

An evaluation has been made of four techniques of assessing, from radiographs, the position of unerupted maxillary teeth, using radio-opaque markers placed in various positions on the maxilla of a dried skull. Application of the parallax principle in a vertical plane, for which only two radiographs are needed, was found to produce as many correct conclusions as other methods.

Cephalometry↗
PubMed1989

Who should practise orthodontics?

The provision for orthodontic treatment in the General Dental Service of the NHS is examined. Regional variation in the service is described and evidence presented of dissatisfaction with the treatment received. A case is made for changes in the undergraduate curriculum and for the provision of further training for practitioners.

Consumer Behavior↗
PubMed1988

Tracing error with Björk's mandibular structures.

The tracing errors associated with the structures used in Björk's method of mandibular superimposition are investigated using multiple tracings of fifty lateral cephalometric radiographs. The horizontal error levels were much less than the vertical, midline structures more reliable than bilateral structures, and the lower third molar tooth germ more reliable than the inferior dental canal.

Cephalometry↗
PubMed1987

Radiographic localization of unerupted teeth in the anterior part of the maxilla: a survey of methods currently employed.

The radiographic prescribing habits of consultants in orthodontics and oral surgery are described with specific reference to assessment of unerupted maxillary canine teeth. Orthodontists use more radiographs than oral surgeons under these circumstances. The relative radiation for commonly used combinations of radiographs has been summarized and recommendations made regarding the use of certain of these.

Cephalometry↗
PubMed1984

A study of the mandibular closure path in Angle Class III relationship.

A cephalometric study has been made of patients with Angle Class III incisor relationships to discover the extent of any forward displacement of the mandible occurring during closure from the point of initial incisor contact to one in which the posterior teeth occlude. The significance of the findings to the assessment of skeletal pattern is discussed.

Cephalometry↗