Abstract
Muh shield (YC3) was developed to improve the overjet and overbite in the primary dentition. However, there have been no reports on an annual growth amount evaluation using Muh shield in a primary anterior cross bite patients. Therefore, we have applied on Muh shield in two young patients with anterior cross bite. The aim of this study was to examine the treatment effects of the Muh shield in correcting a primary anterior cross bite patient.
Case1 was a girl who was a 6 years and 5 months old. The patient presented that over jet -2mm, overbite +2mm, terminal plane: mesial step type, ANB+2 °.The patient diagnosed as primary anterior cross bite. As a result case1 was increased from ANB +2° to +5°, and there was a skeletal improvement. After using Muh shield 2 years, central incisor increased from overjet -2mm to 2mm.
Case 2 was a boy who was a 6 years and 2 months old. The patient presented overjet -2mm, overbite+1mm, terminal plane: mesial step type, ANB +2°. The patient diagnosed as primary anterior cross bite. As a result case2 was increased from ANB +2°to +3° , and there was a skeletal improvement. After using Muh shield 4years, central incisor increased from overjet -2mm to +2mm.
Furthermore, case1 indicated a down forward growth of maxillary. And mandible showed downward growth. Case2 indicated a down forward growth of maxillary and mandible.
These results indicate that the use of the Muh shield improves functional effects on the skeletal system during primary dentition patients. The use of Muh shield during primary dentition might be effective because it has a function of tongue up. We will progress further study in the near future.
