Root canal system in permanent anterior teeth studied by cone beam computed tomography / 实用口腔医学杂志

ABSTRACT

Objective:To study the root canal system in permanent anterior teeth by cone-beam computer tomography(CBCT).Methods:12 85g anterior teeth in 1 103 patients were divided into group A(≤40 years) and group B(＞40 years).The CBCT images of 6 404 maxillary anterior teeth and 6 454 mandibular anterior teeth were collected.The number of roots and root canals,crown-root length,the types of root canal configurations,symmetry,age-related changes and gender differences were analyzed statistically.The correlation of double root canals system in mandibular anterior teeth were compared.Results:All of the maxillary anterior teeth and mandibular incisors had only one root while 1.66％ double roots were found in canines.The prevalence of double root canals in maxillary and mandibular anterior teeth were 0.03％ and 11.25％ respectively,that of the lateral incisors was the highest(17.40％).Type Ⅰ was the most frequent type (88.75％) in permanent anterior teeth followed by Type Ⅲ (7.07％).There was symmetrical distribution of the bilateral root canals of anterior teeth.There was no statistical significance of crown-root length among different age groups in permanent teeth (P ＞ 0.05).The variation of the root canal rate increased gradually at the age of 18-50 years,decreased gradually after the age of 50.The incidence of double root canals was higher in males (13.12％)than in females (9.93 ％) in mandibular anterior teeth.The incidence of double root canals of mandibular central incisors was positively correlated with lateral incisors and canines respectively (P ＜0.05).Conclusion:The root canal morphology of mandibular anterior teeth is complicated.The prevalence of double root canals is symmetic,age-related and gender difference.