CAJ | 학술논문

目的观察在正畸过程中,微种植钉对于压低下颌切牙、整平Spee曲线的临床效果.方法选取15例深覆(牙合)病例,男5例,女10例,年龄11.3～28.8岁,平均17.2岁,均为安氏Ⅱ类1分类错(牙合),采用拔牙矫治方式,并分别在下颌牙弓纳入平整的0.457 mm×0.635 mm(0.018英寸×0.025英寸)镍钛方丝时,于下颌两侧侧切牙与尖牙的牙根间置入微种植钉.微种植钉加力前及下颌切牙已充分压入时拍摄X线头颅侧位片,通过头影测量分析评价微种植钉压低下前牙的治疗效果.结果得出下颌切牙平均压入(4.10±0.98) mm;下颌磨牙平均伸长(0.91±0.69) mm;下颌切牙压入的量与磨牙伸长的量之比是4.5:1.0；下颌切牙长轴与下颌平面的交角(IMPA)变化平均值是(-0.09±4.12)°；下颌平面角(FMA)变化平均值是(0.25±0.70)°.结论临床上使用微种植钉配合镍钛丝整平Spee曲线时,不但能有效地加速下颌切牙的压入,同时也有效减少下颌磨牙过多伸长.
목적 관찰재정기과정중,미충식정대우압저하합절아、정평Spee곡선적림상효과.방법 선취15례심복(아합)병례,남5례,녀10례,년령11.3～28.8세,평균17.2세,균위안씨Ⅱ류1분류착(아합),채용발아교치방식,병분별재하합아궁납입평정적0.457 mm×0.635 mm(0.018영촌×0.025영촌)얼태방사시,우하합량측측절아여첨아적아근간치입미충식정.미충식정가력전급하합절아이충분압입시박섭X선두로측위편,통과두영측량분석평개미충식정압저하전아적치료효과.결과 득출하합절아평균압입(4.10±0.98) mm;하합마아평균신장(0.91±0.69) mm;하합절아압입적량여마아신장적량지비시4.5:1.0；하합절아장축여하합평면적교각(IMPA)변화평균치시(-0.09±4.12)°；하합평면각(FMA)변화평균치시(0.25±0.70)°.결론 림상상사용미충식정배합얼태사정평Spee곡선시,불단능유효지가속하합절아적압입,동시야유효감소하합마아과다신장.
Objective To evaluate the effects of micro-screw on the intrusion of lower incisors and the leveling of curve of Spee in the process of orthotherapy.Methods Fifteen patients (5 males,10 females) with deep-bite were selected,aged from 11.3 to 28.8 years,with average of 17.2 years.All of them were Angle Class Ⅱ Classification 1 malocclusion and had a curve of Spee larger than 3 mm.Orthotherapy of extraction was adopted for the first premolars of two upper mandible and second premolars of two lower mandible.All these patients had micro-screws implanted at root apex area between lower lateral incisor and canine bilaterally,and when the 0.457 mm× 0.635 mm (0.018 in ×0.025 in) Ni-Tisquare wire was internalized,the strength of intrusion from micro-screws was used.Lateral cephalometric radiographs were taken before loading the micro-screw and immediately when the curve of Spee was leveled.Two linear and two angular measurements were selected for cephalometric analysis.Results The following results were noted: the lower incisors were significantly intruded for a mean of (4.10±0.98) mm; the mandibular molars were not significantly extruded for a mean of (0.91±0.69) mm; some lower incisors proclined and some lower incisors retroclined for a mean of (-0.09±4.12)°.After bite opening,the mandibular plane angle was minimally altered for a mean of (0.25±0.70)°; the ratio of lower incisor intrusioin to lower molar extrusion was 4.5: 1.0.Conclusions The combined use of micro screw with Ni-Ti wire is capable of enhancing the intrusion of lower incisors and leveling the curve of Spee,and it has minimal side effects on the posterior teeth.