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Biomedical subjects

J C Franquin

Publications and source records attributed to J C Franquin.

At least 55 records · Page 3Linked to original sources
PubMed1986

[Pulp-dentin reactions after CO2 laser treatment of the dentin].

The use of a CO2 laser in the treatment of dentinal caries in vital teeth seemed to be an important therapeutical progress compared to traditional means of carious tissue removal with rotary mechanical instruments. Forty sound premolars from patients with a mean age of twelve years were prepared according to a standard method for biological controls and submitted to the action of a CO2 laser of 3 Watts, equipped with a convergent lens of a 38 mm focal distance. The pulpal reactions were observed on day 15, 30, 50 and 80. No clinical post-operative symptomatology was observed in all treated teeth. The pulpal reactions related to the thickness of residual dentine consisted in the presence of reversible inflammatory changes, in the absence of degenerative processes and in an important production of tertiary dentine. The structural modifications occurring on the dentinal walls in these experimental conditions seemed not to induce a barrier totally tight to bacterial penetration.

Bicuspid↗
PubMed1981

[Effect of maternal vitamin A deficiency on cranio-dental structures in the rat].

In collaboration with the Research Department on vitamins and nutrition of Hoffmann-Laroche Laboratories, an experiment has been conducted, in strictly controlled dietary conditions, to study the effects of a maternal deficiency in vitamin A on the cranio-dental development of rat fetuses and of young weanling rats. A minimal dose of 6 international units per day for 100 g of body weight was required by the mothers for the gestation evolution and a natural birth. Hypovitaminosis A induced, in the fetuses, after 21 intrauterine days, a generalized delay in growth and development proportional to the deficiency severity. In the cranial base and the toothgerms, the delay reached over two fetal days. No teratogenic action was noted. The troubles observed in 21 day old fetuses seemed to disappear in young rats, 21 days after natural parturition. This compensation seemed to be related to a prolonged gestation, proportional to the vitamin deficiency and equal to the growth delay observed at the 21 fetal day. Only modifications in the molars, consisting in coronal dimension and enamel mineral density changes were still observed.

Animals↗
PubMed1975

[Root canal screws in amalgam restoration of devitalized teeth].

The placing of amalgam screws into root canals is indicated (1) on damaged teeth if the coronal retenion is insufficient, (2) on vital teeth, after canal treatment, as an alternative to dentine anchors like small crews or pins, and (3) for building up crown cores. Four systems of canal screws are described, Dentatus, FKG, Anthogyr and Mooser. The large differences of dimensions and conicity necessitate a better knowledge of the necessary dimensions of the root reamers and drills. After comparative evaluation of the systems, the clinical technique for the user of the Mooser system is demonstrated.

Dental Amalgam↗