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  • Title: Crown-root ratio of permanent teeth in cleft lip and palate patients.
    Author: Al-Jamal GA, Hazza'a AM, Rawashdeh MA.
    Journal: Angle Orthod; 2010 Nov; 80(6):1122-8. PubMed ID: 20677964.
    Abstract:
    OBJECTIVES: To determine root lengths of fully developed permanent teeth of cleft lip and palate (CLP) patients and to define their crown-root (C/R) ratios. METHOD: Crown height and root length of permanent teeth were measured from panoramic radiographs of 44 CLP patients and 37 controls. A total of 1397 teeth were measured, and C/R ratios were calculated. RESULTS: Higher C/R ratios were found in CLP patients; this was statistically significant for both maxillary and mandibular incisors and canines. Bilateral CLP subjects showed higher C/R ratios in general than unilateral CLP subjects. Roots of maxillary incisors, canines, and some other teeth were significantly shorter in CLP patients than in controls. CONCLUSIONS: CLP patients should be considered to have unfavorable C/R ratios, which could be the result of short root lengths for some teeth.
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