Shohachi Shimooka

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INTRODUCTION The purpose of this retrospective study was to assess the prevalence and distribution of hypodontia in the permanent dentition, excluding the third molars, in a sample of Japanese orthodontic patients. METHODS Orthopantomograms of 3358 Japanese orthodontic patients (1453 boys and 1905 girls) between the ages of 5 and 15 years were examined(More)
OBJECTIVE The purpose of this study was to explore the association of hypodontia patterns and variations in craniofacial morphology in Japanese orthodontic patients. MATERIALS AND METHODS A total of 50 girls with hypodontia (the total group) were selected and categorized into anterior, posterior, and anterior-posterior groups according to the location of(More)
Previous studies have shown that tooth size ratios are ethnicity-, race-, and sex-specific. This study was carried out to determine anterior and overall ratios in a Japanese population and to compare them with Bolton's ratios. Numerical data were obtained from 60 pairs of dental casts of 30 male and 30 female Japanese orthodontic patients. The mesiodistal(More)
OBJECTIVE To ascertain the effects of repeated bonding on the shear bond strength of orthodontic brackets bonded with a fluoride-releasing and -recharging adhesive system with a self-etching primer in comparison with two other types of adhesive system. MATERIALS AND METHODS A total of 48 premolars were collected and divided equally into three groups of(More)
OBJECTIVE To longitudinally investigate the caries risk levels in children undergoing orthodontic treatment with sectional brackets. MATERIALS AND METHODS A total of 42 children scheduled for orthodontic treatment with sectional orthodontic appliances participated in this study. They were divided into two groups based on decayed, missing, and filled(More)
OBJECTIVE To explore the association of maxillary first molar agenesis with other dental anomalies in Japanese orthodontic patients. MATERIALS AND METHODS A total of 32 subjects with one or two congenitally missing maxillary first molars (group M) were selected and divided into group 1M (12 subjects with one maxillary first molar missing) and group 2M (20(More)
OBJECTIVE To explore the association between congenital absence of permanent mandibular incisors and craniofacial and mandibular symphysis morphology in Japanese orthodontic patients. MATERIALS AND METHODS A total of 27 girls with one or two congenitally absent mandibular incisors (group M) were selected and divided into group 1M (16 girls with the(More)
We found few studies on the association between maxillary sinus size and malocclusion in an electronic search using PubMed. The purpose of this study was to investigate maxillary sinus size in different malocclusion groups and the association between maxillary sinus size and dentofacial morphology by the use of lateral cephalometric radiographs. A total of(More)
AIM The purpose of the present study was to evaluate the relationship between infection with cariogenic bacteria or periodontal pathogens and the oral condition of children in the primary and mixed dentition stages. METHOD Children aged 3 to 11 years were selected Detection of cariogenic and periodontopathic bacteria and single nucleotide polymorphism(More)
Periodontal disease is a multiple factor disease caused by genetic factors, environmental factors, and periodontal bacteria (periodontal pathogens). The present study aimed to elucidate the risk factors for periodontal disease in Japanese adolescents. Subjects (11–16 years old) were classified into three groups: localized aggressive periodontitis (LAP),(More)