Guidance on presentation of cephalometry-based research studies. A personal perspective.
This paper presents advice on the planning and presentation of cephalometric investigations.
Cephalometry↗
Biomedical subjects
D R Stirrups
Publications and source records attributed to D R Stirrups.
The stability of bimaxillary osteotomy after correction of skeletal Class II malocclusion.
This study investigates changes following bimaxillary osteotomy for correction of Class II malocclusion. The records of 15 patients who had simultaneous maxillary impaction and sagittal split ramus osteotomy with rigid fixation are evaluated. Traditional cephalometric analysis as well as finite element and Euclidean distance matrix analyses are used to assess the changes. The maxilla was relatively more stable than the mandible; the maxilla stayed within 1 mm of its immediate postoperative position, whereas the mandible was 2 mm from the achieved surgical changes. The mandible rotated in a clockwise direction during the first 6 months after surgery. The mandibular plane angle increased by 2.9 degrees. This is, in part, believed to be due to posterior condylar displacement during surgery. Theories of mandibular relapse following sagittal split advancement osteotomy are discussed. The new methods of morphometric analysis do not require the superimposition of cephalograms and are able to separate maxillary from mandibular changes.
Adult↗
Efficacy of a porcelain refinishing system in restoring surface finish after grinding with fine and extra-fine diamond burs.
Commercial porcelain refinishing kits are claimed to restore the surface finish on porcelain after adjustments in circumstances that preclude reglazing. This study investigates the efficacy of one such kit in restoring a Vitadur N porcelain surface finish after grinding with fine (30 microns grit-red band) and extra-fine (15 microns grit-yellow band) high-speed diamond burs. The production of the porcelain test samples, the refinishing procedures, and the refinishing times were standardized throughout. Techniques were selected to simulate clinical practice. Randomly selected examples of surfaces created during refinishing were subjected to scanning electron microscopy, using standard kV and tilt angle settings, and to surface profilometry tracings. Roughness average (Ra) readings were recorded for each test specimen for every surface finish. Ra readings were analyzed statistically using a two-way unbalanced model for analysis of variance. Although refinishing after grinding with a 15 microns grit bur produced surfaces significantly smoother than on specimens previously ground with the 30 microns grit burs, the surfaces remained significantly rougher than when originally glazed. It is concluded that, using the type of kit tested, burs of a grade finer than the existing 15 microns grit yellow band types would be appropriate for porcelain adjustments to permit subsequent refinishing to a surface smoothness comparable to the original glaze.
Aluminum Oxide↗
Postgraduate qualifications for dentistry in the twenty-first century.
The publication by the General Dental Council of proposals for a specialist register brings into question the applicability of the postgraduate qualifications now available. The moves towards a collegiate home for general dental practitioners, and compulsory vocational training, are further reasons for contemplating radical change.
Education, Dental, Graduate↗
Refinishing of porcelain by using a refinishing kit.
Dental porcelain occasionally requires adjustment in circumstances that preclude reglazing. Porcelain refinishing kits are now available commercially. The effects of using one such kit on Vita VMK bonded porcelain was investigated qualitatively and quantitatively using scanning electron microscopic and surface profilometric techniques, respectively. The kit proved incapable of restoring a surface glaze to porcelain adjusted using a fine (red band) diamond bur, but was capable of reducing significantly the surface roughness (Ra) of adjusted porcelain. The importance of distinguishing between the integrity of the surface glaze and measurements of surface roughness is discussed. Confining the application of refinishing procedures to the surface adjusted is important to avoid unnecessary removal of the original surface glaze.
Carbon↗
A comparative clinical trial of a glass ionomer and a zinc phosphate cement for securing orthodontic bands.
This is a report of a clinical trial, comparing an experimental glass ionomer luting cement with a zinc phosphate cement for securing orthodontic bands. The comparison was made by using survival analysis techniques. The glass ionomer cement performed significantly better than the zinc phosphate cement.
Dental Bonding↗
Selection and use of posterior composites in general dental practice.
This study investigated, by means of a directly mailed postal questionnaire to each of the general dental practitioners in a Scottish Health Board area, the use of posterior composites by general dental practitioners and the factors affecting their selection and introduction of these materials into their practices. Three non-restorative practitioners (two-Orthodontics, one-Oral Surgery) were excluded from the study giving a total of 156. Although a relatively small study, a 60 per cent response rate was increased to 70 per cent after telephone follow up. Of the 109 respondents, 30 per cent offered NHS (National Health Service) treatment exclusively and 70 per cent had mixed NHS/private practices. 77 per cent of the respondents claimed to use posterior composites but 7 per cent of those were using anterior composite materials for posterior restorations. 90 per cent of those claiming to use posterior composites placed fewer than five posterior composite restorations per week. In an area with a high proportion of exclusively private practices findings may have differed.
Bicuspid↗
The deep overbite: prevention of trauma.
An understanding of the mechanisms by which deep overbite trauma develops will allow interception at an early age of those cases most at risk. Measures may then be taken to prevent progression to the stage where treatment becomes difficult.
Dental Occlusion, Traumatic↗
The West of Scotland BDA Branch membership survey.
The Executive Committee of the West of Scotland Branch of the BDA decided to investigate the views of the members on the way that branch activities were being run. A sub-committee was set up to plan and carry out a survey and to report on the results.
Attitude of Health Personnel↗
What becomes of the trainee hospital dental surgeon? A 10-year review of the Glasgow Rotation.
A survey of the career progress of participants in the Glasgow Rotational Training Programme is reported. Seventy per cent of trainees have now left the hospital service but the experience they gained was considered to be worth while.
Education, Dental↗
A comparison of the accuracy of cephalometric landmark location between two screen/film combinations.
The introduction of faster screen/film combinations allows a reduction in radiation dose but at the expense of film quality. This study investigated the accuracy of landmark location on cephalometric radiographs made using two screen/film combinations. No significant differences in reproducibility of landmark location were found. There was a 20 percent difference in the radiation dose between the two film types studied.
Adolescent↗
The effect of age at diagnosis on the complexity and outcome of treatment of palatally ectopic canines.
This study examined the records of 218 patients from the 5-year period 1979-1983 who were treated for palatally ectopic canines in the Glasgow Dental Hospital. It tested the hypothesis that there was a relationship between the age of the patient at diagnosis, and the complexity and outcome of treatment. Whilst the age of the patient had no influence on the complexity of the treatment required, it had a significant effect on the outcome since it was related to the number of failed appointments and the likelihood of completing treatment successfully.
Adolescent↗
Approximal surface finishes on amalgam restorations.
Explore the source record for details and available documents.
Dental Amalgam↗
'Methods of reducing bacterial contamination of the atmosphere arising from use of an air-polisher'.
Explore the source record for details and available documents.
Air Microbiology↗
A new solution to a difficult problem of orthodontic retention.
A report of an aesthetic and simple restorative solution to a difficult problem of orthodontic retention. The case described involved the use of etch retained porcelain restorations and includes a porcelain cantilever laminate bridge.
Adolescent↗
Relapse following surgical treatment of anterior open bite.
From a series of 40 cases of anterior open bite treated surgically by Le Fort I osteotomy, four cases relapsed. The nature of the relapse was investigated by computer aided analysis of lateral cephalometric radiographs. The location, aetiology and possible prevention of the relapse is discussed for each case.
Adolescent↗
A cephalometric analysis of the Le Fort II osteotomy in the non-cleft patient.
The hard and soft tissue changes brought about by Le Fort II osteotomies on 13 non-cleft patients were studied using pre-operative, immediate post-operative and follow up lateral cephalograms. The cephalometric analysis was carried out using a digitizer linked to a microcomputer. The results are compared with a similar study previously reported for cleft patients.
Adolescent↗
Comparison of the abrasive wear in vitro of a number of visible-light-cured composite resins.
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Chemical Phenomena↗