头帽-J钩与微种植钉压低上颌切牙的疗效比较

目的比较头帽-J钩与微种植钉压低上颌切牙时的临床疗效。方法选择上颌前部牙槽骨发育过度的成年患者21例,分J钩组9例,种植组12例,分别使用头帽-J钩和微种植钉压低切牙,比较2组压入术前后头颅定位侧位片相关指标及矫治时间。结果 2组U1-PP均明显减少(P<0.01),种植组减少量大于头帽-J钩组(P<0.01);U1-Sv种植组增大(P<0.01),头帽-J钩组减少(P<0.01);U1/PP角种植组增大(P<0.01),头帽-J钩组变化不明显(P>0.05);U6-PP2组变化均无统计学差异(P>0.05);U6-Sv种植组增大(P<0.01),J钩组变化无统计学差异(P>0.05);压低时间种植组小于头帽-J钩组(P<0.01)。结论微种植螺钉和头帽-J钩均可以很好的压低切牙,微种植螺钉压入效果优于头帽-J钩,并用时少,但会引起切牙唇倾加重后牙支抗负担。

Comparison of the treatment effects of J hook headgear and micro-screwson intrusionof upper incisor

Objective To evaluate the treatment effects of J hook headgear and micro-screwson intrusionof upper incisor. Methods 21 adult patients with overgrown maxillary alveolar were chosen and divided into two groups.J hook headgear group （n = 9 ） , and mi- cro-screws group（ n = 12） ,using J hook headgear and micro-screwsto lowerupper incisor respectively. Cephalometric analysis was per- formedbefore and after treatment,and cephalometric indicatorschangesand treatment time of two groups were compared. ResultsU1-PP of the two groups were significantly reduced（P 〈 0.01 ） , and the reduction of micro-screws group was greater than the J hook headgear group（P 〈0.01 ）; as for U1-Sv, micro-screws group increased（ P 〈 0.01 ）, while J hook headgear group decreased（ P 〈 0.01 ）; in terms of U1/PP corner micro-screws group increased（ P 〈 0.01 ） , and J hook headgear group did not change significantly（ P 〉 0.05 ） ; U6-PP both groups had no statistically significantchange（ P 〉 0.05 ） ; as for U6-Sv, micro-screws group increased （P 〈 0.01 ） , while there was no statistical significant change in J hook headgear group（ P 〉 0.05 ） ; the treatment time of micro-screws group was less than that of J hook headgear group （P 〈 0.01 ）. Conclusions Both J hook headgear and micro-screwshave effect onthe intrusion of incisors, and micro-screws is more effective than J hook headgear with less time, but it will cause anterior teeth labial inclination and increase an- chorage burden.