Investigation of Orthognathic Surgery in Japan Using the National Database

要旨

This study used the national database of health insurance claims and specific health checkups of Japan （NDB）, the world’s leading public medical “big data” provided by the Ministry of Health, Labour, and Welfare, to carry out a survey with the aim of elucidating the actual situation of orthognathic surgeries performed in Japan over the past six years. The survey period was the six years between 2014 and 2019. The study revealed: 1） The number of people operated on was 16,405 patients, which increased year by year, 2） there were 4,877 male patients and 11,528 female patients （male-to-female ratio of 1: 2.4）, 3） the number of patients by age group was highest in the 20-24 year-old group, which included 4,712 patients （28.7％）, and the number of patients increased in each age group and with no changes in patient ratios according to age group, 4） regarding the number of patients according to injury or disease name, those with jaw deformity accounted for around 70％ of the study population, and it was not possible to classify patients according to detailed injury or disease name, 5） regarding the type of medical institution, around 95％ of patients were from university hospitals and general hospitals, although a small number of patients underwent surgery in clinics, 6） regarding the number of patients who were treated in hospitals by bed capacity, many patients （71.3％） were treated in hospitals with more than 200 beds, and 484 patients （3.0％） underwent treatment at clinics without inpatient facilities, 7） the number of patients by region was highest in highly populated regions like Kanto, Kinki, and Kyushu, and 8） regarding surgical techniques, 7,872 cases were treated with maxillary osteoplasty, 15,225 cases with mandibular osteoplasty, and 2,365 cases with genioplasty and anterior mandibular alveolar osteotomy. Our findings suggest that orthognathic surgery is being performed more frequently in medical institutions due to improved safety, shortened hospital stay, and higher social recognition. In addition, the use of orthognathic surgery, which can restore function and aesthetics, is expected to increase in the future.

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