Cone-beam computed tomography for the assessment of root?crown ratios of the maxillary and mandibular incisors in a Korean population
최성환, 김정석, 김철순, 유형석, 황충주,
소속 상세정보
최성환 ( Choi Sung-Hwan ) - Yonsei University College of Dentistry Department of Orthodontics
김정석 ( Kim Jung-Suk ) - Private practice
김철순 ( Kim Cheol-Soon ) - Private practice
유형석 ( Yu Hyung-Seog ) - Yonsei University College of Dentistry Department of Orthodontics
황충주 ( Hwang Chung-Ju ) - Yonsei University College of Dentistry Department of Orthodontics
KMID : 0361920170470010039
Abstract
Objective: This retrospective, cross-sectional study aimed to establish reference data for normal crown and root lengths and the root?crown ratios (R/C ratios) for the mature maxillary and mandibular incisors in a Korean population by using cone-beam computed tomography (CBCT).
Methods: We included 672 Korean patients (141 men and 531 women; mean age, 27.2 ± 7.7 years) who underwent CBCT examinations during various dental treatments. Crown and root lengths and the R/C ratios of the maxillary and mandibular incisors were measured using CBCT data, which were analyzed to detect significant differences between demographic factors as well as sagittal and vertical skeletal or occlusal relationships.
Results: Teeth of the same type in each half-arch were symmetrical. The mean R/C ratios varied from 1.1 to 1.2 for the maxillary incisors and from 1.3 to 1.4 for the mandibular incisors. Crown and root lengths were greater in men than in women, regardless of tooth type. Root lengths and R/C ratios for the mandibular incisors were significantly greater in patients with skeletal Class II malocclusion or an excessive overjet than in the other patients. The R/C ratios for the mandibular incisors were lower in patients with an open bite than in those with a normal or deep bite. Moreover, the R/C ratios for the mandibular incisors increased with age.
Conclusions: The data obtained in our study can serve as reference values for crown and root lengths and the R/C ratios for the maxillary and mandibular incisors in the Korean population.
키워드
Tooth crown; Tooth root; Incisor; Cone-beam computed tomography; Population
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