基于CBCT观察上颌磨牙行固定矫治的正畸患者牙根、牙冠移动及倾斜度变化研究  

Observations of root and crown movement and inclination of maxillary molars undergoing fixed orthodontic treatment based on CBCT

作　　者：颜莉[1] 阿依努尔·霍斯塔伊 YAN Li;AYiNuoEr.HuoSiTaYi(The Sixth Affiliated Hospital of Xinjiang Medical University Xinjiang,Urumqi 830002)

机构地区：[1]新疆医科大学第六附属医院,乌鲁木齐830002

出　　处：《现代口腔医学杂志》2021年第4期241-243,共3页Journal of Modern Stomatology

摘　　要：目的基于锥形束CT(CBCT)观察上颌窦底对上颌磨牙行固定矫治的正畸患者牙根、牙冠移动及倾斜度变化的影响。方法选取需行固定矫治的患者57例,将27例(38颗)第一磨牙牙根未接触上颌窦底患者纳入对照组,30例(41颗)上颌第一磨牙至少1个牙根进入上颌窦底患者纳入观察组。两组患者均拔除上颌第二前磨牙后行固定矫治。比较两组被动结扎一个月(T0期)、加力20周(T1)期牙根、牙冠移动量、牙周倾斜度、牙根吸收情况、牙髓活力。结果两组患者上颌第一磨牙牙冠近远中向移动量比较差异无统计学意义;观察组患者上颌第一磨牙三个牙根近远中向移动量均显著低于对照组;观察组上颌第一磨牙牙周倾斜度改变明显高于对照组;两组患者上颌第一磨牙牙髓活力比较无明显差异;观察组患者上颌第一磨牙牙根吸收程度明显重于对照组。结论进入上颌窦底的磨牙在固定矫治正畸移动过程中牙根移动受阻,倾斜移动程度增加,牙根吸收程度加重。Objective To investigate the root and crown movement and inclination of maxillary molars undergoing fixed orthodontic treatment based on cone beam CT(CBCT). Methods Fifty-seven patients underwent fixed orthodontic treatment were enrolled;38 maxillary first molars from 27 patients with no roots contact with maxillary sinus floors were set as control group, while 41 maxillary first molars from 30 patients which had at least one root entered the maxillary sinus floors were set as observation group. Patients in both groups underwent fixation after the extraction of the maxillary second molars. The root, crown movement, periodontal inclination, root resorption and pulp vitality were compared between the two groups at one month after regular alignment(T0)and 20 wks after adding force(T1). Results The amount of proximal and distal first molar crown movement had no significant difference between groups. The proximal and distal movement of the three maxillary first molars in observation group was significantly lower than that in control group. The change of periodontal inclination of the first molar in observation group was significantly higher than that in control group. The pulp activity of the maxillary first molar had no significant difference. The root resorption of first molar in observation group was significantly higher than that in control group. Conclusion During the orthodontic orthodontic treatment, the root movement of molars into the maxillary sinus is blocked, which increases the inclined movement and aggravates the root resorption.

关 键 词：锥形束CT 上颌磨牙 固定矫治 移动 

分 类 号：R783.5[医药卫生—口腔医学]