Odontodysplasia

Results of a comprehensive dental examination, including a histologic evaluation, of a patient showing unilateral odontodysplasia revealed no hint as to the origin of the abnormality. A complete medical examination also resulted in negative findings, with the excetion of congenital bilateral talipes equinovarus. The genetic history was negative, and results of chromosomal studies of the child and her mother revealed no abnormalities. Neither had an anatomic or a functional abnormality, with the exception of the odontodysplasia in the child. Results of laboratory studies including complete blood counts, urinalyses, ferric chloride tests of the urine, and electrolyte tests also were negative. The special considerations given in this case in an attempt to establish a possible causation of the abnormality were inconclusive. We think, however, that the management of the patient was successful in regard to the prosthetic appliance, and every attempt will be made to follow up the patient to ensure a good prognosis of the remaining developing dentition.

[Fibrous dysplasia and a cementofibroma in a child]

The authors present a case of odontogenic tumour occuring at birth. Its origin seems to be an early modification of the ectomesenchyme. The course of the disease may be followed by lines within the dentin traced by courses of tetracycline during the first few years of life.

Dental abnormalities in the deciduous and permanent dentitions of individuals with cleft lip and palate

ANORMALITATES DENTAL IN LE DENTITION PRIMARI E PERMANENTE DE INDIVIDUOS CON FiSSURA DE LABIOS E/o DE PALATO.—Le dentitiones primari e permanente de 39 subjectos con fissura del labios e/o del palato esseva studiate a base de material in le collection de modulos serial del Centro pro le Studio de Palatos Fisse al Universitate Illinois. Le objectivo esseva determinar le natura, le frequentia, e le distribution de anormalitates morphologic del coronas. Plus anormalitates dental occurreva in fissuras palata que in altere typos. Ex un gruppo total de 1716 unitates dental, 189 esseva anormal (11 pro cento). In casos de fissura palatal, le dentes mandibular esseva afficite non minus frequentemente que le dentes maxillar.

Transposition of teeth and genetic etiology

Twenty-one cases of transposition are presented showing a crude prevalence of 0.4%. A high rate of bilateral occurrence was seen. A significant number of cases were associated with other dental anomalies, such as peg-shaped lateral incisors and overretained deciduous teeth. Genetic etiology has been stressed and various other theories discussed.