The purpose of the present study is to assess the bone activity occurring in the sutures biomechanically activated by facial mask. A tubinger type facial mask was applied to a 16-year-old female child with Class III anomaly, who had completed her pubertal growth spurt. SPECT records were taken before and 6 months after treatment. It was observed in the measurements that there appeared significant increases in right and left sides of zygomatico-maxillary suture and outer zygomatico-maxillary area. These increases demonstrate stimulated bone activity in those areas.

Keywords: Protraction headgear, Sutures, SPECT