王正芳,
常新^,
大连医科大学附属第二医院 口腔科, 辽宁 大连 116027

详细信息 作者简介: 王正芳(1993-), 女, 硕士研究生。E-mail: 1191706353@qq.com


通讯作者: 常新, 教授。E-mail: changxin66@aliyun.com 中图分类号: R783.5


摘要:目的通过治疗前后X线片探讨微种植体在远中移动上颌磨牙矫治安氏Ⅱ类错的临床应用中，上颌第一磨牙远移的临床效果，牙根的吸收程度，并对其远移距离与牙根长度变化量进行相关性研究。方法选取20例安氏Ⅱ类错畸形患者，平均年龄（25.50±4.10）岁，20例患者均在双侧上颌第二前磨牙与第一磨牙颊侧牙槽间隔植入40颗微种植体，治疗前后均拍摄头颅侧位片及曲面断层片。在头颅侧位片上测量上颌第一磨牙近中颊尖（U6-PP Vert）及颊侧近中根尖（U6R-PP Vert）的远移距离，上颌第一磨牙牙轴（U6/PP）及上颌第一磨牙垂直向（U6-PP）的变化；在曲面断层片上测量治疗前后上颌第一磨牙颊侧近远中牙根长度的变化。对样本治疗前后上颌第一磨牙远移的距离及牙根长度进行配对t检验，检验各测量项目是否有统计学意义；并对上颌第一磨牙远移的距离和牙根长度的变化量进行Pearson相关性研究，分析两者之间是否存在相关性。结果微种植体远移磨牙治疗前后，上颌第一磨牙垂直向变化无统计学意义（P>0.05）；上颌第一磨牙牙轴的变化有统计学意义（P < 0.05）；治疗前后上颌第一磨牙颊侧近远中牙根长度的变化有统计学意义（P < 0.05）；治疗前后上颌第一磨牙远移距离与其颊侧近远中根长度变化量呈正相关，相关系数分别为r₁=0.912，r₂=0.893；P < 0.01。结论利用微种植体远移磨牙治疗后，上颌第一磨牙近远中牙根有一定程度吸收；上颌第一磨牙远移距离与其颊侧近远中牙根长度的变化量呈正相关关系，随着牙齿移动距离增加，牙根吸收程度也增加；说明牙齿移动距离对牙根的吸收有一定影响。
关键词: 微种植体/
磨牙远移/
牙根吸收


Abstract:ObjectiveTo investigate the clinical application of micro-implant in distal maxillary molars for Class Ⅱ malocclusion, the effect of molar distalization and the degree of root resorption, the distance and the length of maxillary molar root were analyzed by X-ray before and after the treatment, and the correlation between the two was studied.MethodsIn this study, we selected 20 patients Class Ⅱ malocclusion. The patients were 19-32 years old, with an average age of (25.5±4.10) years. All the patients were designed to distalized maxillary molars with micro-implant. In 20 patients, 40 micro-implants were implanted between the second maxillary premolars and the buccal alveoli of the first molar, the distance of the mesiobuccal apex (U6-PP Vert) and the mesiobuccal root apex (U6R-PP Vert) of the first molar, and the change of the first molar axis (U6/PP) were measured on the lateral cephalometric and curved radiographs before and after treatment, the vertical changes (U6-PP) of the first molars were averaged to evaluate the effect of molar distalization, and the root length of the maxillary first molars was measured before and after treatment. The distance of molars and the length of root of maxillary first molar were compared by paired t test before and after treatment. The pearson correlation analysis was carried out to study the distance of molar distalization and the length of root, and whether there was correlation between them.ResultsThere was no significant change in the vertical direction of the maxillary first molar (P>0.05), but there was significant change in the axis of the first molar (P < 0.05). Before and after treatment, the root length of maxillary first molar was significantly different (P < 0.05). Pearson correlation analysis revealed that there was a positive correlation between the distance of the maxillary first molars and the length of the buccal mesial and distal roots before and after treatment. The correlation coefficients were r₁=0.912, r₂=0.893, P < 0.01.ConclusionThe root length of the maxillary first molars changes after using the micro-implant. There is a positive correlation between the distance of the maxillary first molar moving away and the length of the buccal mesiodistal root. The root resorption increases with the distance of the teeth moving, and the distance of tooth movement has some effect on the root resorption.
Keywords:micro-implant anchorage/
molar distalization/
root resorption

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