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Biomedical subjects

T A Alexander

Publications and source records attributed to T A Alexander.

At least 19 recordsLinked to original sources
PubMed1986

An unusual case of bull gore injury.

An unusual and hitherto unreported presentation of a bull gore injury sustained during harvest festival celebrations is described. The patient was seen with the metal horn cover complete with decorative ribbons impacted in his orbit. The injury had caused a blowout fracture of the orbital floor, and at surgery the globe was retrieved from the maxillary antrum. The development of optic atrophy precluded useful vision in the injured eye.

Adult↗
PubMed1984

Investigation of chewing patterns in deep-bite malocclusions before and after orthodontic treatment.

A knowledge of chewing provides a better understanding of normal jaw movement and can help form a basis for assessing the effects of malocclusion on jaw function. This study was conducted to describe the effects of deep-bite malocclusion on masticatory function and to determine what changes may occur with orthodontic correction. Five subjects, each exhibiting deep overbite in the early permanent or adult dentition, were selected for this study. Two subjects had Class II, Division 1 malocclusions, and the other three had Class I malocclusions. By means of the "replicator system" jaw movements during border movements and unilateral chewing were recorded and analyzed by computer plots. The typical chewing pattern of all five subjects was characterized by midsagittal opening, wide lateral closing movements, tooth gliding, and a pause at the intercuspal position and during swallowing. Comparison of these findings with chewing data from normal children in previous studies indicated that the deep-bite malocclusion did not create a major disturbance in chewing. Some differences between the preoperative and postoperative condition were noted, however. Prior to treatment, three subjects showed a nearly vertical chewing cycle which avoided tooth contact at the border path. Following treatment, all subjects showed a greater coincidence between the closing chewing path and the lateral border movement. This indicated more gliding tooth contact after treatment. Following deep-bite correction, the border paths showed a refinement of the intercuspal position (IP) and an increased steepness in lateral tooth guidance near IP. The total vertical component of tooth guidance was reduced by treatment.

Adolescent↗
PubMed1984

Choroidal osteomas.

Two patients with choroidal osteoma, one with bilateral involvement, diagnosed by fluorescein angiography, ultrasonography and CT scanning are presented. The clinical presentation, differential diagnosis and significance are discussed.

Adolescent↗
PubMed1984

Vitrectomy and photocoagulation in the management of serous detachment associated with optic nerve pits.

Two cases of serous detachment of the retina associated with congenital pits of the optic nerve were successfully treated with photocoagulation, vitrectomy and gas tamponade. The rationale of management and the results are discussed. It is suggested that this treatment deserves further study to see if early intervention will favourably affect the return of macular function, particularly in cases of optic nerve pits where the serous detachment is of short duration and fixed structural changes at the macula have not occurred.

Adolescent↗
PubMed1978

Nasal glioma.

In this report 12 cases of nasal glioma are reviewed. It is shown that they present in three different ways. The etiology, pathology, differential diagnosis, and treatment are discussed.

Female↗