The purpose of this study was to investigate a treatment system intended to promote improvement in the cooperation of patients. The subjects of the investigation were 45 uncooperative patients who had difficulty in accepting regular dental treatment. This treatment system consists of A) caries inhibition stage by Ag(NH3)2F, B) first temporary restoration stage with low viscosity glass ionomer cement, C) second temporary restoration stage with restorative glass ionomer cement and D) final restoration with regular restorative material. One treatment stage in the system was carried out according to the grade of the cooperation of the patients, then the advanced treatment stage superseded the former when the cooperation was improved. The period of time required for the improvement of cooperation, and the durability of the glass ionomer cements were examined. The following results were obtained. 1. The durability of the low viscosity glass ionomer cement was 11 months for the anterior teeth, and 12 months for the posterior teeth. 2. The durability of the regular glass ionomer cement was revealed to be 18 months for the anterior teeth and 17 months for the posterior teeth. 3. 7 months were required for the improvement in the cooperation of the patients from stage B to stage C and 14 months for improvement from stage C to stage D. 4. Improvement in cooperation appeared in a shorter time when this treatment system is begun to be applied to the patients at lower age. The staged restoration system is an effective method for the behavior management of uncooperative patients.(ABSTRACT TRUNCATED AT 250 WORDS)