歯牙外傷に関する臨床的検討： 特に電気刺激に対する歯髄反応について

Abstract

This study was designed in order to clarify the mode of response of dental pulps in teeth injured by trauma and time-course changes. The response of dental pulps to electrostimulation after trauma was studied by a follow-up examination of 14 patients with anterior teeth in and around mandibular fractures and subluxation of the mandibular anterior teeth involving 30 teeth. The following results were obtained.1. 46.7% of all teeth which responded negatively to electric stimulation at the time of injury showed positive sensibility after a varing time period: In the cases of subluxation of the teeth, electric dental pulp testing turned positive in 33.3%. On the other hand, in the cases of teeth in and around fracture lines, electric pulp testing turned positive in 52.4%.2. The electric pulp testing became positive most frequently 2 or 3 months after trauma. Subluxation of teeth was relatively earlier in recovery of the pulp response than teeth in and around fracture lines.3. In surgical treatment of mandibular fractures, electric pulp testing became positive in 87.5%. On the other hand, in conservative treatment of mandibular fractures, electric pulp testing became positive in 30.8%.4. The incidence of positive sensibility in electric pulp testing was 87.5% in Type I, 80% in Type II and 0% in Type III. The surgical treatment of mandibular fractures in Type II was relatively higher in incidence of recovery of pulp response than that in Type I.