RESUMO
Because of limited resources, most Electro Convulsive Therapy is done in Thailand are unmodified method. One of the most common complications of this treatment is injury of the oral cavity. This study was made to compare the degree of oral cavity injures in psychiatric patients treated by unmodified ECT with those who used the conventional wooden tongue blade covered with cotton-gauze, ad those who used a mouth guard clear tray, 80 patients were recruited. They were randomly allocated to two groups, the experimental group using a mouth guard clear tray and the control group using a wooden tongue blade covered with cotton-gauze. Oral cavity examination was made before and after treatment in both groups by a qualified dentist who was unaware of the group to which each patient belonged. The results showed that the experimental group experienced fewer oral cavity complications than the control group at the significant level of 0.01 (p<0.01).