微种植钉和口外弓在成人骨性Ⅱ类高角患者中的疗效对比

Comparison of miniscrews and headgear facebow in treatment of skeletal class Ⅱ adults of hyperdivergent

关键词:  微种植体  口外弓  成人  高角

Key words:  [Key words]　miniscrew  headgear facebow  adults  hyperdivergent

摘要:

[摘要]　目的　在成人骨性Ⅱ类患者中分别应用微种植钉和口外弓，评价两者的临床疗效。　方法　将32例骨性Ⅱ类高角患者分为两组，每组16例，分别应用微种植钉与高位牵引口外弓作支抗。比较两组矫治时间以及矫治前后头颅侧位片测量结果的变化。　结果　微种植钉组较高位口外弓组矫治时间短，疗程差异有显著性意义(P<0.01)。微种植钉组B-X距、U1-X、U1-Y、U6-X、UL-EP、ANB、UL-EP及LL-EP的减小明显大于口外弓组(P<0.01)，B-Y距增大明显大于口外弓组(P<0.01)。U6-Y的增大明显小于口外弓组（P<0.05）。两组间A-X距、A-Y距的差异无显著性意义(P>0.05)。　结论　微种植钉能在更短时间内最大程度内收前牙、控制磨牙，促进下颌骨逆时针旋转，在改善Ⅱ类骨面型方面具有明显优势。

Abstract:

[Abstract] Objective　To compare miniscrew and headgear facebow in skeletal class Ⅱ of hyperdivergent adults and to evaluate the clinical efficacy.　Method　Thirty-two patients,who were treated with miniscrew and headgear facebow higher traction for skeletal class Ⅱ,were divided into two groups. Cephalometric analysis was performed to observe the changes of the characteristic lands on the dentofacial morphology before and after treatment.　Results　The course of miniscrew was shorter than that of headgear facebow (t=-3.89，P<0.01). The decreases of B-X distance,U1-X,U1-Y,U6-X,UL-EP,ANB,UL-EP and LL-EP with miniscrew were much more than those of headgear facebow higher traction (P<0.01). The increase was much more in B-Y distance (P<0.01). The increase of U6-Y was less in headgear facebow (P<0.05). The differences of A-X and A-Y were not statistically significant (P>0.05).　Conclusion　Miniscrew are much better in En-masse retraction of anterior teeth and controlling the molars and can promote the mandibular with counterclockwise rotation. It has obvious advantages in improving facial profile of class Ⅱ.