CAJ | 학술논문

背景：牙弓后段长度不足与错牙合畸形的形成和发展密切相关。目的：测量兰州地区成人个别正常牙合牙弓后段长度。 　　方法：在兰州地区甘肃籍在校大学生中选择18-24岁正常牙合102例(男47例，女55例)，平均年龄(19.33±2.67)岁，拍摄头颅侧位片，按照下颌平面角分为高角组(>32°)、低角组(<22°)、均角组(22°-32°)3组。分别测量受试者上、下颌牙弓后段长度，并进行性别、组内、组间比较分析。 　　结果与结论：上颌牙弓后段长度男性稍大于女性，差异无显著性意义(P>0.05)。下颌牙弓后段长度男性稍大于女性，差异无显著性意义(P>0.05)。组间比较发现，男性低角型下颌牙弓后段长度显著大于男性高角型下颌牙弓后段长度，差异有显著性意义(P<0.05)。可以初步说明牙弓后段在发育过程中不受性别影响，不同垂直骨面型、不同性别成人个别正常牙合牙弓后段长度存在差异
　　배경：아궁후단장도불족여착아합기형적형성화발전밀절상관。목적：측량란주지구성인개별정상아합아궁후단장도。 　　방법：재란주지구감숙적재교대학생중선택18-24세정상아합102례(남47례，녀55례)，평균년령(19.33±2.67)세，박섭두로측위편，안조하합평면각분위고각조(>32°)、저각조(<22°)、균각조(22°-32°)3조。분별측량수시자상、하합아궁후단장도，병진행성별、조내、조간비교분석。 　　결과여결론：상합아궁후단장도남성초대우녀성，차이무현저성의의(P>0.05)。하합아궁후단장도남성초대우녀성，차이무현저성의의(P>0.05)。조간비교발현，남성저각형하합아궁후단장도현저대우남성고각형하합아궁후단장도，차이유현저성의의(P<0.05)。가이초보설명아궁후단재발육과정중불수성별영향，불동수직골면형、불동성별성인개별정상아합아궁후단장도존재차이
BACKGROUND:Posterior arch length deficiency is closely related to the formation and development of malocclusion. OBJECTIVE:To measure the posterior arch length in individual normal occlusions of adults in Lanzhou. METHODS:A total of 102 current col ege students with individual normal occlusions, with a mean age of (19.33±2.67) years (range 18-24 years), including 47 males and 55 females from Gansu Province, were chosen to take lateral cephalograms. Al research objects were divided into three groups according to mandibular plane angle:high angle group (Frankfort mandibular-plane angle>32°), low angle group (Frankfort mandibular-plane angle<22°) and control group (22°≤Frankfort mandibular-plane angle≤ 32°). Posterior arch length of both maxil ary and mandibular arches was measured, and the data were compared between genders and groups and in groups. RESULTS AND CONCLUSION:Posterior arch length of maxil ary arch was slightly longer in male group than that in female group, and the difference was not significant (P>0.05). The posterior arch length of mandibular arch was slightly longer in male group than that in female group, but the difference was no significant (P>0.05). Comparison between groups revealed that the posterior arch length of low angle mandibular arch was significantly longer than that of high angle mandibular arch in male group, and the difference was significant (P<0.05). The results indicate that the gender wil not influence the development of posterior arch length. Different vertical facial types and different genders have different posterior arch length in individual normal occlusions of adults