Biomedical subjects
Publications and source records attributed to A F Ruud.
Hypodontia was demonstrated in a mother and her monozygotic triplets. The triplets and their mother exhibited considerable variation in the expression of the trait. The variation within the triplets must be due to non-genetic factors.
Transantral (infraorbital, transmaxillary) examination of the temporomandibular joint was compared with conventional transcranial examination and lateral tomography of patients with rheumatoid arthritis aged 23 to 83. Abnormalities were most frequently found at tomography, and equally frequent at transantral and transcranial examinations. The various examinations appeared to be rather supplementary. Bone erosion was frequently observed at transantral examination, which appeared to be the preferable radiographic method for detecting arthritis of this joint. Combined with transcranial examination, the method is recommended for the evaluation of temporomandibular joint abnormalities in rheumatoid arthritis if tomographic equipment is not available.
To evaluate the mandibular growth and temporomandibular joint (TMJ) changes in juvenile rheumatoid arthritis, a clinical and radiographic 17-year re-examination of 9 of 19 patients has been carried out. A varying degree of micrognathia (mandibular retrognathia, 'bird face') was observed by means of radiographic cephalometric analysis, at both the base-line and follow-up examination of 6 of the patients. No facial asymmetry was found. Rotation of the mandible in relation to the anterior cranial base during the follow-up period, observed in 5 of the 6 patients, indicated a further disturbance of mandibular growth. In 3 patients with mandibular rotation, a dental occlusion anomaly was observed. The TMJ revealed radiographic changes in 6 patients at the base-line examination and in all patients at the re-examination. Micrognathia and the dental occlusion anomaly were associated with radiographic TMJ changes.
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