BACKGROUND: Mandibular motion tracking system (ManMoS) has been developed for orthognathic surgery. This article aimed to introduce the ManMoS and to examine the accuracy of this system. METHODS: Skeletal and dental models are reconstructed in a virtual space from the DICOM data of three-dimensional computed tomography (3D-CT) recording and the STL data of 3D scanning, respectively. The ManMoS uniquely integrates the virtual dento-skeletal model with the real motion of the dental cast mounted on the simulator, using the reference splint. Positional change of the dental cast is tracked by using the 3D motion tracking equipment and reflects on the jaw position of the virtual model in real time, generating the mixed-reality surgical simulation. ManMoS was applied for two clinical cases having a facial asymmetry. In order to assess the accuracy of the ManMoS, the positional change of the lower dental arch was compared between the virtual and real models. RESULTS: With the measurement data of the real lower dental cast as a reference, measurement error for the whole simulation system was less than 0.32 mm. In ManMoS, the skeletal and dental asymmetries were adequately diagnosed in three dimensions. Jaw repositioning was simulated with priority given to the skeletal correction rather than the occlusal correction. In two cases, facial asymmetry was successfully improved while a normal occlusal relationship was reconstructed. Positional change measured in the virtual model did not differ significantly from that in the real model. CONCLUSIONS: It was suggested that the accuracy of the ManMoS was good enough for a clinical use. This surgical simulation system appears to meet clinical demands well and is an important facilitator of communication between orthodontists and surgeons.
Dental Arch ; Dental Models ; Facial Asymmetry ; Jaw ; Orthognathic Surgery* ; Splints

A 55-year-old woman with fever and consciousness disorder diagnosed as infective endocarditis was transported to our hospital. She had atopic dermatitis. A mobile vegetation at the mitral valve was revealed by the transesophageal echocardiography, and a computed tomography (CT) scan showed cerebral infarction, left renal infarction and suspected embolization of the vegetation. Streptococcus aureus was detected in the blood culture test. We conducted emergent surgery, mitral valve plasty was performed. On the second day after the operation, the hemoglobin began to decrease, and the hemodynamics became unstable. The contrast CT examination revealed arterial bleeding from the left kidney, which had an infarction before the operation. We performed emergent catheter liquid embolization for the superior polar branch of the left renal artery, and the hemodynamics improved thereafter. There has been no report of renal hemorrhage after cardiac surgery for infective endocarditis. This case reminded us that cardiac surgery for infective endocarditis may cause various complications of organs.

BACKGROUND: Age-related musculoskeletal diseases are becoming increasingly burdensome in terms of both individual quality of life and medical cost. We intended to establish a large population-based cohort study to determine environmental, lifestyle, and genetic risk factors of musculoskeletal and other age-related diseases, and to clarify the association between vitamin D status and such diseases. METHODS: We targeted 34,802 residents aged 40-74 years living in areas of northern Niigata Prefecture, including Sekikawa Village, Awashimaura Village, and Murakami City (Murakami region). The baseline questionnaire survey, conducted between 2011 and 2013, queried respondents on their lifestyle and environmental factors (predictors), and self-reported outcomes. Plasma 25-hydroxyvitamin D (25[OH]D) concentration, an indicator of vitamin D status, was determined with the Liaison® 25OH Vitamin D Total Assay. The primary outcome of this study was osteoporotic fracture; other outcomes included age-related diseases including knee osteoarthritis, perception of chronic pain, dementia, and long-term care insurance use. Mean ages of men and women were 59.2 (SD = 9.3, N = 6907) and 59.0 (SD = 9.3, N = 7457) years, respectively. From the blood samples provided by 3710 men and 4787 women, mean 25(OH)D concentrations were 56.5 (SD = 18.4) nmol/L (22.6 ng/mL) and 45.4 (SD = 16.5) nmol/L (18.2 ng/mL), respectively. DISCUSSION Follow-up surveys are planned every 5 years for 15 years, and incident cases of our targeted diseases will be followed at hospitals and clinics in and nearby the cohort area. We anticipate that we will be able to clarify the association between vitamin D status and multiple disease outcomes in a Japanese population.
Aged ; Aging ; Cohort Studies ; Epidemiologic Research Design ; Female ; Humans ; Incidence ; Japan ; epidemiology ; Male ; Middle Aged ; Musculoskeletal Diseases ; epidemiology ; prevention & control ; Predictive Value of Tests ; Quality of Life ; Risk Factors ; Vitamin D ; analogs & derivatives ; blood