To obtain information about the status at present of dental caries in deciduous dentition, the authors examined outpatients with respect to treatment discussed the findings. From the 4th September,1979 to the 6th August,1981 a period of about two years,2000 child patients visited the clinic of Pedodontics at the Niigata University Dental Hospital. The 635 child patients out of 2000, who were in Hellman's dental stage IIA, were examined and the findings discussed.
The following findings were obtained:
1. As for the upper anterior deciduous teeth, the number of extracted teeth and the number of teeth nessesary for endodontic treatments showed high rate of treatment among children at an early age.
2. As for the upper and lower posterior deciduous teeth, the number of teeth requiring treatment of dental caries showed a high rate among children at an early age.
3. As for the upper and lower posterior teeth, the lower teeth showed higher rate than the upper teeth requiring endodontic treatment and for teeth extraction.
4. As for the deciduous canines, the number of teeth requiring treatment showed low rate and the number of teeth requiring treatment for a restoration showed high rate a treatment.
5. There was no difference in treatment between right and left.6. The age increment conberning the percentage of restorative and endodontic treatment was not noted.
7. As for the extracted teeth, the first primary molars showed a much higher rate of increment than the second molar among the upper posterior deciduous teeth as they grew, but the lower the first and second primary molars both showed a high tendency of increment.