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Cone-beam computed tomography for the assessment of root-crown ratios of the maxillary and mandibular incisors in a Korean population

Authors
 Sung-Hwan Choi  ;  Jung-Suk Kim  ;  Cheol-Soon Kim  ;  Hyung-Seog Yu  ;  Chung-Ju Hwang 
Citation
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.47(1) : 39-49, 2017 
Journal Title
 Korean Journal of Orthodontics  (대한치과교정학회지) 
ISSN
 1225-5610 
Issue Date
2017
Keywords
Cone-beam computed tomography ; Incisor ; Population ; Tooth crown ; Tooth root
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.
Files in This Item:
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DOI
10.4041/kjod.2017.47.1.39
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
유형석(Yu, Hyung Seog) ORCID logo https://orcid.org/0000-0002-1275-5078
최성환(Choi, Sung Hwan) ORCID logo https://orcid.org/0000-0002-1150-0268
황충주(Hwang, Chung Ju) ORCID logo https://orcid.org/0000-0003-3024-4551
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/154080
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