In previous studies, mouth pockets have been associated with relaxation and hypertonicity of the facial muscles of the lips and face, mouth breathing, unnatural lip length and increased jaw size below the nose. I know that.In addition, when the force to close the lips (lip closing force) is weakened, the upper front teeth tilt forward and protrude, and the width of the upper left and right back teeth becomes narrower. It is said to be related.

　However, a large nationwide survey to assess the prevalence of oral poccus in children has never been conducted in the past, and whether the prevalence of oral poccus varies by age and region. , It was not enough to verify what factors were related to oral poking.

　Therefore, with the cooperation of the National Pediatric Dental Practitioner Association, this group conducts a large-scale epidemiological study on 66 children aged 3 to 12 who regularly receive 3,399 pediatric dentistry nationwide. bottom.As a result, it was found that 30,7% of Japanese children show daily mouth sickness, and the prevalence of mouth sickness increases with age.In addition, there was no regional difference in the prevalence of oral poccosis.

　Twelve items such as "there is no tightness in the lips", "the nose is clogged", and "eating with noise" were extracted as factors closely related to mouth pockets.These may be related not only to maxillofacial morphology and position, but also to mouth breathing and allergic rhinitis.

　From the results of this study, it was suggested that the oral cavity of children is a disease that is difficult to cure spontaneously.Based on this result, it is expected that further research such as pathological analysis of oral cavity and establishment of improvement method will be advanced in the future.

Paper information:[Environmental Health and Preventive Medicine] Prevalence of an incompetent lip seal during growth periods throughout Japan: a large-scale, survey-based, cross-sectional study