Three Cases of Improvement of Anterior Crossbite in Children with Autism Spectrum Disorder Using MUH Shield

<p>The MUH Shield is a functional orthodontic appliance which can be used immediately because it is sold as a ready-made product, and requires no time for impression acquisition or fabrication, thus avoiding rejection, and so may be suitable for children with disabilities. In this study, we report three cases of children with autism spectrum disorder and anterior crossbite in whom the MUH Shield was used to improve the tegmental relationship.</p><p>The developmental age of the three patients was 3-4 years old. They accepted oral examination, and there was no extreme perioral sensitivity or bad oral habits. First, the device was shown by the TSD method, touching was performed, and then the device was inserted into the oral cavity. After training on taking the device on and off several times, the patients could close the lips and breathe nasally while holding it in the mouth for 1 minute.</p><p>In two cases, the device was difficult to use at bedtime and could only be used for about 1 to 2 hours during the day, but with the cooperation of the mother, one of the two cases improved after about 1 year of continuous daily use. In the other case, the relationship improved after 2 months because it became possible to use it at bedtime 1 week after the start of use.</p><p>In patients with autism spectrum disorder, it is considered worth trying this device as the first choice when anterior crossbite is observed.</p>