CAJ | 학술논문

目的：对比分析骨性Ⅱ类与骨性Ⅰ类错?畸形拔牙矫治前后软组织美学指标的变化差异。方法选取骨性Ⅱ类Ⅰ分类错?畸形患者27例及骨性Ⅰ类双颌前突患者26例，采用直丝弓矫治技术进行矫治，每位患者均拔除了4颗双尖牙。将矫治前后的X线头颅侧位定位片进行软组织美学指标的测量分析。结果骨性Ⅱ类组患者矫治前后上唇倾角（ A′Ls-FH）、颏沟倾角（ Pg′B′-FH）、Z角和面突角（ G-Sn-Pg′）的变化差异有统计学意义（ P＜0.01）。骨性Ⅰ类组患者矫治前后上唇倾角、颏沟倾角和Z角的变化差异有统计学意义（P＜0.01）；矫治前后两组在Z角、面突角均存在差异。矫治前后两组无论组内或组间面角（NsPg′-FH）的变化均无统计学意义（ P＞0.05）。结论拔牙矫治对骨性Ⅱ类Ⅰ分类及骨性Ⅰ类双颌前突错?畸形患者面型影响均较大，两组拔牙矫治前后的侧貌差异主要存在于颏部。面角非衡量骨性Ⅱ类Ⅰ分类及骨性Ⅰ类双颌前突是患者拔牙矫治前后侧面型变化的敏感指标。
목적：대비분석골성Ⅱ류여골성Ⅰ류착?기형발아교치전후연조직미학지표적변화차이。방법선취골성Ⅱ류Ⅰ분류착?기형환자27례급골성Ⅰ류쌍합전돌환자26례，채용직사궁교치기술진행교치，매위환자균발제료4과쌍첨아。장교치전후적X선두로측위정위편진행연조직미학지표적측량분석。결과골성Ⅱ류조환자교치전후상진경각（ A′Ls-FH）、해구경각（ Pg′B′-FH）、Z각화면돌각（ G-Sn-Pg′）적변화차이유통계학의의（ P＜0.01）。골성Ⅰ류조환자교치전후상진경각、해구경각화Z각적변화차이유통계학의의（P＜0.01）；교치전후량조재Z각、면돌각균존재차이。교치전후량조무론조내혹조간면각（NsPg′-FH）적변화균무통계학의의（ P＞0.05）。결론발아교치대골성Ⅱ류Ⅰ분류급골성Ⅰ류쌍합전돌착?기형환자면형영향균교대，량조발아교치전후적측모차이주요존재우해부。면각비형량골성Ⅱ류Ⅰ분류급골성Ⅰ류쌍합전돌시환자발아교치전후측면형변화적민감지표。
Objective To compare the difference in aesthetic indicators of facial profile between the patients with skeletal Class Ⅱand Ⅰmalocclusion before and after the extraction treatment .Methods The samples consist of 53 patients(27 with skeletal Class Ⅱ division Ⅰ malocclusion,and 26 with skeletal Class Ⅰ bimaxillary protru-sion) .Every patient were corrected by straight wire appliance and each of them were extracted four premolars .Later-al cephalograms taken before and after the treatment were evaluated to determine the difference in aesthetic indicators of facial profile .Results The patients with class Ⅱmalocclusion showed significant changes in the angle of inclina-tion of upper lip ( A′Ls-FH) , the angle of inclination of chin ( Pg′B′-FH) , Z angle and the angle of protrusion of pro-file( G-Sn-Pg′) after the treatment ( P<0.01 ) .The patients with class Ⅰ showed significant changes in A′Ls-FH, Pg′B′-FH and Z angle after the treatment ( P<0.01 ) .There was significant difference before and after treatment in Z angle and G-Sn-Pg′between the two groups .But there was no significant changes in NsPg′-FH either intra-group or inter-groups before and after treatment ( P>0.05 ) .Conclusion The facial profile of patients with skeletal Class Ⅱand Ⅰ malocclusion can be affected by the extraction treatment .The main difference in profile between the two groups occurred in the region of soft chin .NsPg′-FH is not a sensitive indicator to determine the profile changes for the patients with skeletal Class ⅡandⅠmalocclusion.