口腔外科領域における電気刺激に対する各種病態下の歯髄反応についての臨床的研究

第2編外傷, 疾患および手術等により侵襲を受けた歯髄の電気刺激に対する応答の変化

抄録

There are various methods of investigating the process of healing oro-maxillary tissue injured by trauma, disease or surgery. The author tried to calrify the healing process of affected tissue by analyzing the responses to electrostimulation of dental pulps planted in the invaded region.
Cases of trauma chosen for the study were those of fracture of the jaw, fracture of the alveolar bone and luxation of the tooth. Dental pulps near the site of the trauma were examined in respect to the mode of response to electrostimulation and time-course changes in it. In these cases, electric dental pulp testing turned positive in 46. 5% of dental pulps that had been negative. The testing became positive most frequently at 1-4 months and at 8 months after the trauma.
Among diseases of the maxillary sinus, maxillary sinusitis and postoperative maxillary cyst were chosen for the study. The electrostimulation threshold for dental pulps on the affected side was compared with that for clinically healthy dental pulps. As a result, in the cases of maxillary sinusitis, the figure scattered in-and outside of the mean±standard deviation extensively. On the other hand, in the cases of postoperative maxillary cyst, 60. 8% of the cases showed higher threshold than average threshold for clinically healthy dental pulps, among others, premolars showed high frequency of 84. 1%.
Radical operation on the maxillary sinus was performed for the aforesaid diseases of the maxillary sinus, and the effect of the operation on dental pulps was evaluated by electrostimulation. Negative response to electric pulp testing was exhibited by 32.9% of the pulps on the surgically treated side, with the second premolar affected most strongly by operation. In the postoperative follow up, electric pulp testing became positive in 50. 0% of the teeth with negative response, most frequently at 1-4 months after the operation.