A CBCT study on the effect of impacted mesiodens on the root development of upper central incisors

GAO Hui; CHEN Yan-mei; LIU Yu-ting; YANG Fang-hong

doi:10.15956/j.cnki.chin.j.conserv.dent.2017.06.005

Abstract：AIM: To explore the influence of the mesiodens on the root development of the maxillary central incisors.METHODS: The incidence rate of supernumerary teeth and the clinical characteristics of the mesiodens in 4,576 patients were studied.The root length, crown length, crown/root ratio and the number of curved roots of the maxillary central incisors were measured in the group of impacted mesiodens(n=35 cases, 70 teeth), the group after removal of the erupted mesiodens(n=33 cases, 66 teeth), the group of the mensiodens removed by surgery(n=24 cases, 48 teeth) and the control group with no mesiodens(n=45 cases, 90 teeth).Data were analyzed by SPSS 18.0 statistical software.RESULTS: ① The mesiodens was found in 176 out of the 4, 576 patients (4.72%), 127 in the males and 49 in the females.71.02% of the mesiodens were impacted, and 83.5% of the mesiodens were followed by anterior teeth malocclusion.② The root length of the incisors in the group of impacted mesiodens and the group of mensiodens removed by surgery was shorter than that in the control group, however, no significant difference was found between former 2 groups.Significantly more curved roots of the incisors were found in the impacted group than in other groups(P<0.05, among the other groups, P>0.05).CONCLUSION: The roots of maxillary central incisors are shortened and the curved roots are increased in the patients with impacted mesiodens.The removal of impacted mesiodens has a shorten effect on the root development of central incisors.Extraction of the impacted or erupted mesiodens does not affect the root development of maxillary central incisors.