Biomedical subjects
Publications and source records attributed to J R Jasmin.
This article presents the removal of an attached pulp denticle with the use of a pulsed dye laser. The quartz fiber was introduced in the root canal and placed in direct contact with the free border of the denticle. Thirty-two pulses were necessary to fragment the pulp stone. A scanning electron-microscopic study shows a sharp section at the base of the pulp stone.
Natal teeth are present at birth, whereas neonatal teeth erupt during the first postnatal month. Mobile natal or neonatal teeth should be removed to prevent aspiration.
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.
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.
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.
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.
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.
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.
Explore the source record for details and available documents.
Two epidemiologic studies regarding the prescription and the absorption of fluorides have been conducted: one among pediatricians, the other among parents of children under 3 years registered in day-nurseries. The results show that even though more pediatricians and parents are aware of the importance of correct dental care in children, they are often badly informed. Fluoride tablets should be prescribed at birth diluted in feeding-bottles of water. This prescription should be continued for 5 years, because of its systematic and effective action. Later, it should be replaced by a fluoride tooth paste which however may be used from the age of 2 years when fluoride tablets are not given. Pediatricians have a responsibility to ensure that parents are knowledgeable on the use and importance of fluoride for their children.
Prolonged frequent bottle feeding with sugar rich liquids leads to early multiple dental caries. This dental disease known as the baby bottle syndrome may have serious long-term local as well as general consequences. A general anesthesia is frequently necessary in order to treat the extensive dental lesions in affected young children. Paediatricians have a major role to play in the prevention of this disease: 1) by teaching parents appropriate preventive measures on nutrition, early oral and dental hygiene and fluoride supplementation; 2) by regularly looking for early signs of rampant caries and by alerting parents when they are found.
Cysts commonly develop at the time of eruption of deciduous teeth. Excision is easy to perform. Eruption cysts should be differentiated from neonatal epulis and hemangioma.
The use of chewing-gum may be beneficial to oral hygiene and become part of an anti-cavity prevention protocol. The conditions of use must be well defined: the sweetener should not be used by the bacterial plaque and fluoride, an anti-cavity agent, must enter into its composition.
Explore the source record for details and available documents.
In France, 6 children on 1,000 are abused or neglected. The orofacial lesions are most often evocatives, but the diagnosis is sometimes delicate. The laws and the deontologic code are not precise concerning the attitude of the dentist facing a Silverman syndrome. In U.S.A., 8% of all dentists responding saw suspected cases of child abuse. We have not such statistics in France. The structures of protection and taking in care seems to be unknown of our collegues.
Explore the source record for details and available documents.