[Case report of progenie with a congenitally missing mandibular right incisor].

The female in this case was 9 years and 9 months old at the initial visit with a dental stage of III B. The chief complaint was anterior cross bite. Diagnosis revealed a class III angle at the right side and class I at the left. The ANB angle was -3.0 degrees with mandible shifting to the left side. Tooth size was large, and a lack of space, observed, and 2 was congenitally missing. A chin cap was used for treatment to retract and inhibit mandibular growth. The anterior cross bite was corrected within two months when class I angle molar relationship was achieved and the extraction of midline was also corrected. Since the lack of space in the upper arch was about 10 mm, extraction of 5 was decided, although the assigned ANB angle improved to be -0.5 degree within one year of treatment. 3 was to replace the position of the congenitally missing 2. At the age of 11 years and 1 month, 4 was extracted to guide the eruption of 3. 4 and E were extracted guide the eruption of 3 and 5. Then 5 was extracted. As a result of these serial extractions, space closing and leveling were automatically achieved without use of the multibracket system. Good stable occlusion has been maintained up to the present age of 15 years and 8 months.