Root Caries Prevalence and Association between Root Caries and Coronal Caries in the Elderly

DOI 28 References
  • TAKANO Naoko
    Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Medical and Dental Sciences, Niigata University
  • YOSHIHARA Akihiro
    Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Medical and Dental Sciences, Niigata University
  • ANDO Yuichi
    Department of Oral Science, National Institute of Public Health
  • OGAWA Hiroshi
    Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Medical and Dental Sciences, Niigata University
  • HIROTOMI Toshinobu
    Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Medical and Dental Sciences, Niigata University
  • YAMAGA Takayuki
    Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Medical and Dental Sciences, Niigata University
  • HANADA Nobuhiro
    Department of Oral Science, National Institute of Public Health
  • MIYAZAKI Hideo
    Division of Preventive Dentistry, Department of Oral Health Science, Graduate School of Medical and Dental Sciences, Niigata University

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Other Title
  • 高齢者の根面う蝕の有病状況と歯冠う蝕との関連

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Abstract

The purpose of this study was to investigate the prevalence and intraoral distribution of root caries in the elderly, and to identify the association between root caries and coronal caries. Six hundred noninstitutionalized adults aged 70 years in Niigata, Japan were examined for their oral status and general health status. A total of 544 subjects identified as dentate was available for assessment. The prevalence of root caries was evaluated as the percentage of the subjects with one or more root caries and the mean number of teeth with root caries. The intraoral distribution was evaluated as the mean percentage of exposed root surfaces affected by root caries in terms of tooth surface (buccal, lingual, distal, mesial) and tooth group (incisor, canine, premolar, molar). In the analysis of the associations, subjects were divided into 4 groups according to the number of coronal caries first, and then the prevalence of root caries was evaluated in each group. Next, logistic regression analysis where the dependent variable was one or more root caries and the independent variables including the number of teeth with coronal caries was performed. The percentage of male subjects with one or more root caries (DF) was 56.9% and that of female subjects was 53.3%. The mean number of root DFT was 1.81 (SD=2.41) per person for males and that for females was 1.41 (SD=1.93) per person, respectively. As for untreated root caries (D), the percentage of male subjects with one or more root D was 21.7% and that of female subjects was 19.8%. The mean number of root DT for males was 0.46 (SD=1.10) per person and that for females was 0.32 (SD=0.81) per person. The tooth type most commonly affected by root caries in the maxilla was canine and in the mandible it was premolar. The percentage of exposed root surfaces affected by root caries was 17.5% and 11.5%, respectively. As for tooth surface distribution, the buccal surfaces were the most commonly affected with a percentage of 15.8%. The mean number of teeth with root caries and the percentage of subjects with root caries increased with the number of coronal caries. Logistic regression analysis indicated that the prevalence of coronal caries was significantly associated with that of root caries (odds ratio=1.08, p<0.001) after adjusting for other oral variables. In conclusion, the results suggest that the prevalence of root caries in the elderly was high, and the prevalence of coronal caries was associated with root caries prevalence.

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