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Radiographic assessment of clinical root-crown ratios of permanent teeth in a healthy Korean population

Authors
 Hee-Jung Yun  ;  Jin-Sun Jeong  ;  Nan-Sim Pang  ;  Il-Keun Kwon  ;  Bock-Young Jung 
Citation
 JOURNAL OF ADVANCED PROSTHODONTICS, Vol.6(3) : 171-176, 2014 
Journal Title
 JOURNAL OF ADVANCED PROSTHODONTICS 
ISSN
 2005-7806 
Issue Date
2014
Keywords
Ethnic differences ; Panoramic radiograph ; Prognosis of teeth ; Root/Crown ratio
Abstract
PURPOSE: The aim of this study was to determine the absolute value of the root/crown ratio (R/C ratio) using panoramic radiographs (PRGs) in a healthy Korean population. MATERIALS AND METHODS: In total, 99 patient radiographs (of 50 males and 49 females subjects; aged 16 to 24 years old) were examined, and 2,770 teeth were analyzed. Crown lengths and root lengths were measured with modified Lind's measurements using PACS tools by two examiners in two separate sessions two months apart. All data were analyzed using SPSS. The independent t-test was used to assess for gender differences, and the paired t-test was used to compare both arches with a significance level of P<.05. RESULTS: The mean R/C ratios varied from 1.29 to 1.89 (male: 1.28-1.84; females: 1.31-1.94). The highest R/C ratios were recorded for the mandibular canines (1.89), followed by the maxillary canines (1.79). The lowest R/C ratios were recorded for the maxillary second molars (1.31). In comparison with the maxillary teeth (1.29-1.78), the mandibular teeth yielded the higher R/C ratio (1.47-1.89), and this difference was significant in the females (P<.05). The difference between the genders was not statistically significant, except for the maxillary central incisors, mandibular canines and mandibular first premolars. CONCLUSION: These data may enhance the understanding of the clinical R/C ratio as a useful guideline for determining the status of teeth and the ethnic difference.
Files in This Item:
T201401970.pdf Download
DOI
10.4047/jap.2014.6.3.171
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Pang, Nan Sim(방난심) ORCID logo https://orcid.org/0000-0003-4265-673X
Yun, Hee Jung(윤희정)
Jung, Bok Yeong(정복영) ORCID logo https://orcid.org/0000-0002-8186-2109
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/99035
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