单侧完全性唇腭裂患者磁力扩弓后牙弓宽度的稳定性研究

Stability of dental arch width in the patients with complete unilateral cleft lip and palate after the magnetic palatal expansion

目的:研究磁力扩弓正畸治疗唇腭裂患者错牙合畸形的临床疗效和稳定性。方法:选择32例恒牙晚期单侧完全性唇腭裂患者,进行磁力扩弓和固定矫治。制取患者治疗前、后和保持2年后的数字化模型,拍摄治疗前、后及保持2年后锥形束CT。对上颌各段牙弓宽度、基骨弓宽度和牙根长度进行测量。结果:磁力扩弓后,上颌各段牙弓宽度以及上颌基骨宽度均有显著增加(P<0.05),其中第一磨牙间的牙弓宽度增加最显著(P<0.01);保持2年后牙弓宽度无明显变化(P>0.05)。扩弓后上颌第一前磨牙的颊根长度变化具有统计学意义(P<0.05)。结论:磁力扩弓和固定矫治相结合,可以较好地扩大唇腭裂患者的上颌牙弓宽度,获得尖窝交错咬合关系和长期稳定性。

Objective:To investigate clinical efficacy and transverse stability of patients with cleft lip and palate after magnetic pal⁃atal expansion and fixed appliance.Methods:The samples consisted of 32 individuals with complete unilateral cleft lip and palate in the late permanent dentition who underwent magnetic palatal expansion and fixed appliance.Maxillary arch widths and cone⁃beam com⁃puted tomography(CBCT)images were taken at pretreatment,posttreatment and two year of retention.The width of the arch,the width of the basal bone arch and the length of the root of the maxilla are measured.Results:Maxillary arch widths increased significantly in arches(P<0.05),especially in the first molar arch area(P<0.01).Arch widths decreased after two year of retention and were not sta⁃tistically significant(P>0.05).After orthodontic treatment the lengths of tooth roots were reduced,but only after magnetic palatal ex⁃pansion the change in mesial buccal roots of the first premolar was statistical significant(P<0.05).Conclusions:Magnetic palatal ex⁃pansion and fixed appliance can correct the transverse discrepancies,offering satisfactory occlusion relation and stability in patients with complete unilateral cleft lip and palate.