[An epidemiologic survey of caries frequency and periodontal status in children 6 to 15 years of age in 11 provincial regions in central France, Bourgogne and the Ile de France].

An epidemiological survey of dental caries and periodontal conditions was conducted on 2,022 children in eleven french "departments" of Center of France and part of Bourgogne and lle de France. It showed a dft of 3.03 and dfs of 4.

[Proposal of a new analgesia test based on the observation of nociceptive behavior induced by electric stimulation of dental pulp in the rat].

Dental pulp was electrically stimulated in the awake rat. When the stimulus intensity was progressively increased the following four nociceptive reactions successively appeared: jaw opening reflex, scratching, head rotation, vocalization. The threshold of these four reactions was observed before and after administration of three antalgic drugs.

Is electrical stimulation of the rat incisor an appropriate experimental nociceptive stimulus?

The purpose of this study was to determine whether or not tooth pulp stimulation in the rat can selectively activate the pulp nerve fibers without excitation of the periodontium and to decide if the nerve fibers situated in the pulp of the rat's incisor are involved in the nociceptive reactions caused by an intrapulpal stimulation. The experiments were carried out on 20 awake and freely moving Sprague-Dawley rats. Bipolar stimulating electrodes were inserted into the pulp of the left lower incisor and in the right incisor after removal of the pulp.

Effects, in the rat, of various stressing procedures on the jaw-opening reflex induced by tooth-pulp stimulation.

Jaw-opening reflex (JOR) induced by a repetitive tooth-pulp stimulation delivered at 1 Hz was observed in awake, freely-moving rats. Modifications of the reflex responses of the digastric muscle were produced by foot-shock stimulation, by an oesophageal administration of placebo and a subcutaneous injection of saline. Subcutaneous injection of saline evoked a total disappearance of the reflex which returned within 30 s.

Variations of the jaw opening reflex observed in awake, freely moving rats.

Long term variations of the jaw opening reflex (J.O.R.