Factors and the conditions causing irritation of a dental pulp

The irritation of a pulp of a tooth can arise owing to caries of a teeth, as a result of preparation of a tooth and carious cavities, under influence a filler material, owing to penetration of microorganisms at not tight seal, at an exposure dentin.

Caries of a tooth serves as a principal cause of changes in a pulp and its inflammations. Already at initial damage dentin fibrilloblasts react adjournment secondary and formation of a layer scleroid dentin (adjournment of salts of calcium on walls of dentinal canaliculus) down to full occlusion of dentinal canaliculus. These processes should be considered as display of protective mechanisms of a pulp on action of a cue.

At processing of a caries and destruction of enamel of a bacterium get in dentin, however the inflammation of a pulp does not arise. It is established, that first signs of an inflammation come, when carious the cavity is separated from a pulp by a layer of 1,1 mm [Reeves R., Stanley H. R., 1996], i.e. the pulp practically is not infected up to an instant of penetration of microorganisms in secondary dentin [Massler, Pawlak J., 1977].

Preparation of a cavity without use of a water spray leads to its damage. Thus probability of damage of the in direct proportion area of preparation and depth of damage. Thus, preparation of a tooth under vinirs or artificial crownwork without due cooling serves a serious risk factor for a dental pulp.

Filler materials. There are the numerous data specifying irritating influence various of filler materials. From cements the most expressed adverse action renders silicate though specify, that it is shown at formation of a clearance between edge of enamel and dentin as microorganisms nestle close in dentin [Brannstrom, 1979].

Composites also are considered as irritating materials. First of all, toxicity of composites of the first generation was marked. Materials let out now as specify numerous supervision, render insignificant influence on a pulp.

During many years use of bondings was studied at sealing. It is proved, that improvement of a compounding bondings has allowed to achieve favorable reaction of a pulp to used composites.

Regional permeability as considers a number of researchers, is a principal cause of irritation of a pulp after sealing. The leading part thus belongs to microorganisms. With the purpose of the prevention of the specified changes in a pulp it is recommended to spend padding fabrics of a tooth and use bonding systems.

The exposure of dentin can occur after loss of a seal, as a result of deleting fabrics, at erosion, etc., that is accompanied by sensitivity action of irritating factors. Sensitivity can arise also at an exposure cervical dentin because canaliculus of dentin become opened.

The sheeting (direct) provides:

1) clarification of a surface of a pulp;

2) drying of a cavity;

3) imposing on the naked pulp of medical paste;

4) a seal from zinc oxide eugenic acid cement;

5) imposing of a constant seal.

Most widely used materials for protection of a pulp contain all calcium hydroxide. As a result of it above a site of an exposure it is postponed secondary dentin, forming the dentin bridge. Consider, that formation of a barrier occurs not due to the calcium containing in a material, closing a pulp.