CAJ | 학술논문

目的研究拔牙与非拔牙正畸治疗对牙弓宽度以及微笑美学的影响.方法选正畸临床治疗非拔牙患者和拔除4颗第1双尖牙患者各100例,分别对其矫治前、后模型上颌尖牙间和下颌尖牙间的牙弓宽度进行测量,测量点为尖牙长轴之牙根齿槽部的最突点,测量数据经统计学分析验证结果.结果正畸矫治前两组患者的上颌及下颌牙弓宽度差异均无统计学意义(P＞0.05).矫治后,非拔牙组下颌宽度增加了0.88 mm(P＜0.001),上颌宽度增加了0.84 mm(P＜0.001);而拔牙组下颌宽度增加了1.64 mm(P＜0.001),上颌宽度增加了1.50 mm(P＜0.001).矫治后,拔牙组比非拔牙组下颌宽度增加了0.59 mm(P＞0.05),上颌宽度减少了0.10 mm(P＞0.05).结论拔牙矫治与非拔牙矫治不但均未造成上下颌牙弓宽度之降低,反而引起明显的增宽.拔牙矫治导致牙弓缩窄,从而影响微笑的美观的结论不能成立.
목적 연구발아여비발아정기치료대아궁관도이급미소미학적영향.방법 선정기림상치료비발아환자화발제4과제1쌍첨아환자각100례,분별대기교치전、후모형상합첨아간화하합첨아간적아궁관도진행측량,측량점위첨아장축지아근치조부적최돌점,측량수거경통계학분석험증결과.결과 정기교치전량조환자적상합급하합아궁관도차이균무통계학의의(P＞0.05).교치후,비발아조하합관도증가료0.88 mm(P＜0.001),상합관도증가료0.84 mm(P＜0.001);이발아조하합관도증가료1.64 mm(P＜0.001),상합관도증가료1.50 mm(P＜0.001).교치후,발아조비비발아조하합관도증가료0.59 mm(P＞0.05),상합관도감소료0.10 mm(P＞0.05).결론 발아교치여비발아교치불단균미조성상하합아궁관도지강저,반이인기명현적증관.발아교치도치아궁축착,종이영향미소적미관적결론불능성립.
Objective To investigate the effect of orthodontic tooth extraction and non-extraction on dental arch width and esthetical smile. Methods 100 patients treated without extraction and 100 patients treated by 4 first-premolars extraction were selected. The study models of the patients were measured before and after the treatment and compared statistically. Measurements were made in the maxillary and mandibular canine regions from the most labial aspect of the buccal axial surfaces of the canine roots. Results Before treatment, maxillary and mandibular arch widths were the same between both groups (P＞0.05). In non-extraction group, mandibular arch width of posttreatment was 0.88 mm larger than that of pretreatment (P＜0.001), and maxillary arch width of posttreatment was 0.84 mm large (P＜0.001). In extraction group, mandibular arch width of posttreatment was 1.64 mm larger than that of pretreatment (P＜0.001), and maxillary arch width of posttreatment was 1.50 mm large (P＜0.001). After treatment, the width of mandibular arch in the extraction group was 0.59 mm larger than that in the non-extraction group (P>0.05), while the width of maxillary arch in the extraction group was 0.10 mm less (P>0.05).Conclusion Both extraction treatment and non-extraction treatment do not result in narrower dental arch, but wider. The view that orthodontic extraction results in narrower arch widths and unaesthetic smiling is untenable.