Objective The cone-beam CT(CBCT)was used to compare the hardness of enamel between mesiodens and maxillary lateral incisors and analyze the relationship between the two teeth,seeking a method of autologous tooth graft-ing.Methods PLANMECA ROMEXIS Viewer software was used to collect a total of 104 mesiodens from 75 supernu-merary tooth patients in the stomatology department of the First Affiliated Hospital of Bengbu Medical University from Au-gust 2015 to July 2017.Then,the enamel hardness of mesiodens and maxillary lateral incisors were evaluated by Hounsfield units(HU).The HU values of five tooth surfaces were detected,including the incisal edge(A),the labial midpoint(B1),the midpoint of the cervical margin in the labial surface(B2),the lingual midpoint(Ll)and the mid-point of the cervical margin in the lingual surface(L2).Results A total of 104 mesiodens were detected,of which 98 were impacted(94.2％)and 6 were erupted(5.8％).Forty-six(61.3％)had a single mesiodens,while 29(38.7％)had two mesiodens.No significant difference was observed in the enamel hardness between the right and left maxillary lat-eral incisors and right and left mesiodenses(A,B1,B2,L1,L2 site,P＞0.05).The enamel hardness of L1 and L2 surfaces was similar between mesiodens and the right maxillary lateral incisor(P＞0.05).While,there were differences in the enamel hardness of the right maxillary lateral incisor and mesiodens at the A,B1,and B2 surfaces.It is observed that the enamel hardness of the right maxillary lateral incisor were higher than mesiodens(P＜0.001).Conclusion The enamel hardness is similar between mesiodens and maxillary lateral incisor.Mesiodens with normal shapes may be an ide-al substitute for missing maxillary incisors.
Supernumerary toothMesiodensMaxillary lateral incisorsEnamel hardnessCone beam computed tomo-graphyHounsfield units
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