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Biomedical subjects

J R Jasmin

Publications and source records attributed to J R Jasmin.

16 recordsLinked to original sources
PubMed1992

[The orodental status of a population of school children in the southeast of France in 1991].

An epidemiological survey was conducted in 1991 in the South-East of France in order to estimate the oral health conditions of a sample of 6-15 year old children. The caries prevalence of 457 subjects was presented as mean values of the dft, dfs, DMFT and DMFS indices. The dft and dfs indices decreased from the age of 6 years and the mean number of decayed surfaces of deciduous teeth was always lower than two. First carious lesions in permanent teeth were diagnosed at 6 years, but no filling was observed before 7 years. The fissure caries were the most frequent. Extractions for caries were very rare. The comparison of this study with a similar one made in 1987 showed a reduction in caries more important in the permanent teeth. A decrease in the number of decayed surfaces was also observed. This improvement in oral health seemed to be mainly related to better oral hygiene and an increase in the use of fluoridated dentifrices.

Adolescent↗
PubMed1991

Embryology of the hair follicle.

A study of hair follicle development has enabled us to differentiate four stages by relating them to corresponding gestation ages. Stage I of the hair bud is characterized by an epiblastic proliferation penetrating the subjacent mesenchyma at the extremity of which mesenchymal cells accumulate. This appears, at the level of the lower lip, before the 11th week of intrauterine life. Stage II of the hair bulb is reached on the 12th-13th week of intrauterine life, as soon as the distal extremity of the hair bud, which has extended, becomes depressed at the mesenchymal papilla level. Stage III is defined by the observation of hair cone and rough sebaceous glands on the 15th week of intrauterine life. Finally, stage IV shows a differentiated sebaceous gland with a hair which comes through the skin surface on the 18th week of intrauterine life.

Fetus↗
PubMed1991

[Prevention of orodental injuries in athletic children: let us play!].

Prevention of traumatic tooth injuries during sports practice in children who are particularly at risk due to their dental and maxillary morphology is important when establishing a certificate of aptitude to sport. In some children this may provide an occasion to propose an orthodontal correction for dental protrusion. In any case, fitted protective mouth-pieces made by a competent dental surgeon should be recommended. They are preferable to the commonly available gum shields, which are not secure enough.

Athletic Injuries↗
PubMed1991

A scanning electron microscopic study of the enamel of neonatal teeth.

Neonatal teeth, two mandibulars incisors and one maxillary central incisor, from two separate patients were examined, by SEM. Besides typical enamel anomalies, the incisors exhibited partial or total absence of root formation. These findings suggest that the early eruption of natal and neonatal teeth is dependent on osteoblastic activity within the area of the tooth germ. The reported cases show that teeth may erupt without root formation and without periodontal ligament which correlate with the role of the dental follicle during tooth eruption.

Dental Enamel↗
PubMed1991

[Palatal groove in premature newborns].

Prolonged intubation for very low birth weight neonates induces the formation of a palatal groove. Intraoral appliances are used to prevent this complication. However, it still exists inhalation and ingestion risks when an impression is taken. Irritation of the skin of the upper lip when using a surgical tape to secure the tube is usual. This article deals with modifications brought to avoid such disadvantages.

Dental Impression Technique↗
PubMed1991

Embryology and secretory activity of labial salivary glands.

This study was carried out on the heads of 20 foetuses aged between 11 and 26 weeks. Four stages were distinguished in the development of labial salivary glands, each stage corresponding to gestational age. Stage I is characterized by a localized, rounded thickening of the stomodial epiblast into the mesenchyma of the mucosal side of the lower lip. This occurs at the 9th-10th week of gestation. Stage II is reached when the epiblastic thickening assumes the form of a single cord. It is oval when sectioned transversally and is the result of the proliferation of epiblastic cells into the underlying mesenchyma during the 11th-12th week. Stage III corresponds to a branching process which takes place at the 13th week. The single cord branches to form the future secretory lobes, which rapidly assume a grape-like appearance. The number of rudimentary glands increases during the first three stages of development, i.e. as long as the first formed glands have not developed ducts. Stage IV corresponds to the process of duct formation at the 18th week. Simultaneous differentiation of acinal and duct cells is observed and this procedes the onset of secretory activity.

Basement Membrane↗
PubMed1977

Studies of bone and soft-tissue tumours induced in rats with radioactive cerium chloride.

A colloidal suspension of radioactive cerium chloride was inoculated into the hind legs of Sprague Dawley rats. Bone and soft-tissue tumours were induced at the site of inoculation in 77% of the animals. All bone tumours were osteogenic osteosarcomas. Soft tissue tumours were mostly malignant and were of various histological types, predominantly fibrosarcomas, haemangiopericytomas, angiosarcomas and rhabdomyosarcomas. A kinetic study showed that the doubling time (DT) of tumours was closely correlated with the anatomical site of tumour development: bone tumours had a DT of 17.4 +/- 4.3 days and malignant tumours which developed in soft tissues had a DT ranging from 7.4 to 8.4 days with the exception of two haemangiosarcomas which had a long DT of 17 +/- 0.6 days. Pulmonary metastases were frequent for osteosarcomas and tumours of vascular origin. This model of induction of bone and soft-tissue tumours in rats by injection of a colloidal suspension of radioactive cerium chloride offers the possibility of more comprehensive physiopathological and kinetic studies of these tumours and may constitute a good model for their human counterparts.

Animals↗
PubMed1977

Induction in rats of paranasal sinus carcinomas with radioactive cerium chloride.

A colloidal suspension of radioactive cerium stabilized in the form of hydroxide was inoculated into young Sprague-Dawley rats near the maxillary sinus. Well-differentiated epidermoid carcinomas of the paranasal sinus were obtained in 8 of 12 rats and in 8 of 9 animals that liver more then 200 days. Therefore, this istope was highly effectivein inducing tumors at the site of injection. The uniformity of the histologic type of tumors induced under these experimental conditions was remarkable.

Animals↗
PubMedDate not supplied

[Bruxism in children and adolescents].

It is important to know child bruxism symptomatology and etiology. It will allow diagnosis by simple endo and exo oral examination, in deciduous and mixte denture. Early treatment of bruxism can then be established, preserving integrity of permanent denture.

Adolescent↗