Innervation of the permanent teeth

Innervation of the permanent teeth with fully formed roots devoted to the research of many authors. As for the state innervating apparatus permanent teeth at different stages of their development, starting from the moment of the eruption, this issue was not reflected in the literature. The first works in this direction are owned by A. D. Jafarova (1969). Her research showed that in the period of teething and the formation of roots 1/3-1/2 in the pulp are found only individual nerve fibers (Fig. 2). They are well identified in the field of horns. However parodontopatii plexus by this time has not yet expressed. As the tooth number of nerve fibers increases. So, in the teeth roots are formed by 2/3, in the Central parts of the pulp constantly identifies bundles of nerve fibers that, branching out, go to the horns of the pulp. An increasing number of terminal branches, and the layer of odontoblasts celebrated education nerve plexus, most obvious in the field of horns. An increasing number makalnyh fibers, which are defined as in the Central parts of the pulp and horns (Fig. 3). Increase the number of nerve receptors.


Fig. 2. Few nerve fibers and vessels in the area of the horn of pulp second premolar of the child 11 years. The root formed by 1/3. About. 8, approx 10 (A. D. Jafarova, 1969).

Fig. 3. Bundles of nerve fibers, branching in the Central departments of the pulp of the first premolar child 12 years. The roots formed by 2/3. About. 8, approx 10 (A. D. Jafarova, 1969).

Fig. 4. Subtotalling nervous plexus in the area of the horn of molar child of 14 years. The roots formed. About. 8, approx 10 (A. D. Jafarova, 1969).

At the time of completion of formation of roots number of nervous elements increases still further. In the Central part of the pulp are defined more powerful bundles of nerve fibers, which are particularly densely located in the root Department; when the transition to the crown part of the pulp they give a lot of branches, going to the periphery. They consist mainly of makalnyh fibers with a well-pronounced myelin sheath. Increasing the number of threads associated with blood vessels forming around them plexus in the form of spirals and couplings. Educated terminal branches parodontopatii plexus taped all around the crown of the pulp. Especially dense in the field horns (Fig. 4), it gradually decreases towards the neck of the tooth and even absent in the root of the pulp. In a multi-rooted teeth in part pulp, located between the horns, parodontopatii plexus contains less nerve fibers, and they are parallel to the chewing surfaces of the teeth.
Increases significantly by the time the full formation of roots and the number of nerve receptors, which belong to the category of branched shrub with thin branches, going in different planes (L. I. Falin, 1963). Abundant quantity of receptors is defined in parodontological plexus, where they form a continuous receptor field. A lot of them in the layer odontoblasts. Especially richly represented receptors in the area of the horns of the pulp. Quite often identified vascular tissue and vascular receptors. Doubtless interest is represented by receptors found L. And: Fainym in potatoblossom layer of pulp. "They have the form of bushes, leaf threads which run through the layer of odontoblasts and penetrate into the dentin, where they can be traced to the border of the layer calcified dentin. In addition to these endings, the sensitive nature of which is not arouses doubt, predestine and layer odontoblasts there are still other forms of nerve endings in respect of which it is difficult to say whether they are sensitive or effector (trophic) endings. The nerve endings of this kind are presdentin, wrapped in the side and parallel layer odontoblasts, giving from yourself thin lateral twigs. Some of them again falls into the layer of odontoblasts and part ends in predestine".