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Biomedical subjects

L A Usiskin

Publications and source records attributed to L A Usiskin.

At least 19 recordsLinked to original sources
PubMed1998

The relationship between irregularity of the incisor teeth, plaque, and gingivitis: a study in a group of schoolchildren aged 11-14 years.

The relationship between irregularity of teeth and periodontal disease was investigated in 201 children aged 11-14 years. The upper and lower incisor teeth were assessed for spacing, labio-lingual displacement, and mesiodistal overlap at each of the six contact areas. Plaque and gingivitis were assessed at six sites on each of the four upper and four lower incisor teeth. There was evidence for a direct relationship between the number of contact areas with tooth displacement combined with overlap and the number of sites with gingival redness (R = 0.25, P < 0.001), bleeding (R = 0.18, P < 0.01), and profuse bleeding (R = 0.25, P < 0.001). There was no evidence for a relationship between labio-lingual displacement alone and gingivitis. One-hundred-and-twenty-eight subjects without tooth displacement combined with incisor overlap had, respectively, 34, 15, and 35 per cent fewer sites with redness (P < 0.01), bleeding (P < 0.05), or profuse bleeding (P < 0.01) than the 73 subjects with overlap. The statistical significance of these differences was unaffected by covariate adjustment to take account of the effect on gingivitis of variation in the number of sites with plaque. There was no evidence of a relationship between incisor overlap and amount of plaque in these subjects. The results indicate that overlapping of incisor teeth is directly related to gingivitis and this relationship cannot be explained simply by an effect on oral hygiene.

Adolescent↗
PubMed1988

A conversion to flatter archwires.

Clinical and practical features are described for an operator changing fixed appliance technique from a standard edgewise system to one using pretorqued and preangulated brackets, with generally flat archwires.

Cuspid↗
PubMed1985

Future manpower requirements for orthodontics undertaken in the General Dental Service.

The fall in the number of births in England and Wales which took place between 1964 and 1977 is beginning to have an effect on the present-day demand for orthodontic treatment. Using the best available data a mathematical model has been used to predict the likely demand for orthodontic treatment in the General Dental Services of England and Wales from now until 2008. This suggests that there is likely to be a sharp decline in the number of new orthodontic patients presenting for treatment at practices limited to orthodontics during the next 5 years. The recent expansion in the number of places available for postgraduate study of orthodontics makes it extremely unlikely that the position will improve significantly thereafter. There can be little doubt that we are now producing too many orthodontic specialists even allowing for the increase in manpower which might be required to satisfy a future demand for higher standards of treatment.

Dentists↗
PubMed1982

An investigation into factors influencing the amount of orthodontic treatment attempted by the recent graduates of two dental schools.

A questionnaire was sent to Bristol and Guy's Dental Graduates who had been qualified for between 3 and 5 years. This showed that three-quarters of those who were currently in general dental practice had treated six or more orthodontic patients since qualification. A fifth claimed to have treated more than 45. An important factor in determining whether a practitioner carries out orthodontic treatment himself, or refers patients to a specialist, is the confidence he has in his own ability to adjust and monitor orthodontic appliances. The convenience of alternative orthodontic services would appear to have no influence in such decisions.

Adult↗
PubMed1982

The effect of "block' and "longitudinal' orthodontic teaching: a survey of the recently qualified graduates of two dental schools.

In an attempt to compare the long-term effectiveness of the longitudinal teaching of orthodontics at Bristol Dental School with the block system at Guy's Hospital Dental School, a questionnaire was sent to those graduates who had been qualified for between 3 and 5 years. There were significant differences between the two schools, both in the number of patients treated by their graduates and in the proportion of patients that were treated without advice. These differences did not consistently favour one school when males and females were considered separately. Both schools achieved similar success at producing graduates who felt confident at adjusting removable appliances and both groups of practitioners attempted similar orthodontic problems in practice.

Adult↗
PubMed1981

Retraction of canines with axial control using extra-oral traction.

Retraction of canines with control of tooth inclination is described, using the direct application of extra-oral traction. the technique requires a modified facebow to be inserted into buccal tubes on canine bands; no archwires or springs are involved. In the upper arch the facebow is connected to a standard variable pull headgear, while a supported cervical strap is required for the lower canines. Preliminary investigations are outlined and the procedure is illustrated by some clinical cases from a pilot feasibility study.

Cuspid↗