牙根发育对正畸牵引后埋伏前牙牙根及牙周组织的影响

目的:基于锥形束CT(CBCT)研究牙根发育对正畸牵引后埋伏前牙牙根及牙周组织的影响.方法:选择2018年7月-2019年3月西南医科大学附属口腔医院收治的需行上颌埋伏前牙正畸牵引治疗患者34例,共34颗上颌埋伏阻生前牙.根据牙根发育情况,分为未完全发育组和完全发育组,每组各17例.所有患者均行正畸牵引治疗.比较2组患...

Effect of root development on the root and periodontal absorptions of maxillary impacted anterior teeth after orthodontic traction

PURPOSE: To investigate the effect of root development on root and periodontal tissues of maxillary impacted anterior teeth after orthodontic traction based on cone-beam CT (CBCT). METHODS: Thirty-four patients (34 teeth) requiring orthodontic traction for maxillary impacted anterior teeth in Southwest Medical University Affiliated Stomatological Hospital from July 2018 to March 2019 were selected. The patients were divided into incomplete development group and complete development group according to root development, each with 17 cases. All patients received orthodontic traction treatment. Root length, thickness of root canal wall, pulp vitality, width of the attachment ridge, bone mineral density around root and orthodontic traction time were compared between the two groups. Statistic analysis was completed by SPSS 20.0 software package. RESULTS: Root length of complete development group was significantly longer than that of incomplete development group before treatment(P<0.05). After treatment, the root length of incomplete development group was significantly longer than that of the complete development group(P<0.05). The thickness of root canal wall was significantly greater in complete development group than in incomplete development group before treatment (P<0.05), which had no significant difference between groups after treatment(P>0.05). The pulp vitality and width of the attachment ridge had no significant difference between two groups after treatment(P>0.05). Bone mineral density around root was significantly decreased in both groups after treatment(P<0.05), and was lower in complete development group than in incomplete development group(P<0.05). The orthodontic traction time in the complete development group was significantly longer than that in incomplete development group(P<0.05). CONCLUSIONS: In orthodontic traction treatment, the impacted anterior teeth with undeveloped roots have advantages of mild root absorption, rapid periodontal tissue reconstruction, short orthodontic traction time with the root, thickness of root canal wall and pulp vitality in the normal range.