Foundamental Study on the Conservative Treatment of Pulpitis (Especially, to the Electro-Chemical Nature of Tissue of Tooth)

According to the recent conception of the vital reactions which occur in injured or inflamed pulp tissue, it is known that the pulp tissue is endowed the power, enough to protect and recover it'sself from injury or inflammation.But the conservative treatment of pulpitis is so difficult that the pulpectomy or pulpotomy prevails generally as therapeutic methode in daily practice.The difficulty of the treatment of pulpitis lies in that the inflammation is apt to get worse rapidly and the treatment is not carried out without irritating the pulp seriously, for it is surrounded by the hard tissue.In such cases, it seems that the treatment of pulpitis is possible to perform without giving any irritation to the pulp, if the causes or complications of inflammation such as, bacteria, toxin and the high inner pressure of the pulp chamber are able to be subsided by means of application of the direct current.Therefore, author observed how the electroosmosis in wide sence, is conducted inn both extracted human teeth and dog's teeth in situ.And the result were as follows.1) The healthy dentin (ςD), coloured hard carious dentin (ςK), combined material of den-tin and cement (acquired at the wall of the root canal) or cement only (ςz) and pulp tissue (ςp) etc. are electrically charged negative in the solvent at about pH 7.0 and. the comparison of each zeta-potential is ranged as shown|ςD|>|ςz|≅|ςK|>>|ςp|.2) The zeta-potentials of the dental hard and soft tissues show no considerable difference between human and dog.3) The more the pH inclines to a!kalic in the solution between a range of pH 4.3 to 11.2, , the higher towards negative the zeta-potentials become.4) Cation (Ni++) is most quickly transported in human dentin and follow anion (Cl-) and neutral substance (HCHO) by either cataphoresis or electroosmosis.5) Anion is so quickly transported in dentin by direct current as to pH inclines to acidic and cation or neutral substance is transported so quickly as to pH inclines to alkalic.6) It is observed in the extracted human teeth that the anodal application of direct current to the occlusal cavity, filled with physiological saline solution raises the inner pressure of the pulp chamber and the cathodal application on the contrary, decreases. the inner pressure of the pulp chamber.7) And also observed in dog's teeth in situ, that the anodal application of direct current to the cavity decreases the inner pressure of the pulp chamber and the cathodal application on the contrary, raises the inner pressure of the pulp chamber.8) To treat pulpitis, the anodal application of the direct current is considered to be favourable.