A Radiographic Study of the Relationship Between Crown-Root Ratio and Periodontal Bone Destruction

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  • HORIGUCHI Reiichi
    Department of Periodontics and Endodontics Tsurumi University School of Dental Medicine
  • YANAGIDA Misako
    Department of Periodontics and Endodontics Tsurumi University School of Dental Medicine
  • SODA Mamiko
    Department of Periodontics and Endodontics Tsurumi University School of Dental Medicine
  • UEHARA Shigeyuki
    Department of Periodontics and Endodontics Tsurumi University School of Dental Medicine
  • ARAI Takashi
    Department of Periodontics and Endodontics Tsurumi University School of Dental Medicine
  • NAKAMURA Jiro
    Department of Periodontics and Endodontics Tsurumi University School of Dental Medicine

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  • X線写真による歯冠歯根比と歯槽骨破壊との関連についての研究

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This study was performed to know the relationship between crown-root ratio and periodontal bone destruction.<br>One hundred and thirty eight sets of 14-film intra-oral roentgenographs taken from patients with light and moderate periodontal disease by dental students in senior class were used.<br>The routine paralleling long cone technique was used. Those patients were aged from 20 to 66, 73 males and 65 females.<br>Single rooted teeth (5-5/5-5) except molars were evaluated in respect of crown-root ratio and bone destruction.<br>These teeth were divided into groups (54, 3, 21 12, 3, 45, 54, 3, 21 12, 3, 45) and assessed independently with regard to the relationship between crown-root ratio and periodontal bone destruction.<br>These teeth did not have metal crowns and other large restorations such as class 2, 4 or MOD inlays.<br>The periodontal bone height was assessed by the method of Schei et al.<br>The anatomical crown-root ratio was determined by measuring the level of cemento-enamel junction. The bone loss from the cemento-enamel junction was measured in percentage. The measuring was carried out by three trained examiners.<br>The lowest crown-root ratio was observed in lower canine (0.44±0.06). The highest periodontal bone destruction was recognized in lower central incisor (28.4±14.0%). There was not statistically a significant correlation between crown-root ratio and periodontal bone destruction in each group.<br>The periodontal bone destruction in different age groups was evaluated also. The periodontal bone had a tendency to be destroyed with increasing age.

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