目的:调查上海地区青少年人群的正畸治疗需要及自身美学评价。方法:随机抽取上海地区11～13岁青少年686例(男355例,女331例),由正畸专科医师采用正畸治疗需要指数(index of orthodontic treatment need,IOTN)评定受试者正畸治疗需要。...目的:调查上海地区青少年人群的正畸治疗需要及自身美学评价。方法:随机抽取上海地区11～13岁青少年686例(男355例,女331例),由正畸专科医师采用正畸治疗需要指数(index of orthodontic treatment need,IOTN)评定受试者正畸治疗需要。IOTN包括学(dental health component,DHC)及美学(aesthetic component,AC)2部分。同时采用IOTN的美学部分让受试者对自身美观程度进行评价(self-perceived aesthetic component,SAC)。采用描述性统计及卡方检验对调查结果进行统计分析。结果:DHC评分显示26.0%的受试者明确需要正畸治疗,19.8%的受试者为临界病例;AC评分显示5.5%的受试者明确需要正畸治疗,31.7%为临界病例;SAC评分显示1.7%的受试者明确需要正畸治疗,6.4%为临界病例。在明确需要正畸治疗的受试者中,最常见的特征是严重接触点异常(>4 mm)。DHC与AC在评价治疗需要时77.8%结果一致,AC与SAC在评价治疗需要时65.0%结果一致。结论:将近一半的青少年人群明确需要正畸治疗或为临界病例,受试者在进行自身美观程度评价有从轻的倾向。展开更多
This study was aimed at analysing the mechanical characteristics of different mandibular extraction modes using a clear aligner.Three experimental schemes of different extraction patterns were designed to treat mandib...This study was aimed at analysing the mechanical characteristics of different mandibular extraction modes using a clear aligner.Three experimental schemes of different extraction patterns were designed to treat mandibular crowding,including extraction of one mandibular central incisor,bilateral first premolars,and bilateral second premolars.The stress distribution during the space closing was analysed using the finite element method.When a central incisor was extracted,a significant retraction force was found in the anterior region,in line with the design expectation.The posterior teeth,which were designed to move mesially,acted as anchorage for anterior retraction,and were subjected to a mesial force.The anterior teeth were retracted when the bilateral first premolars were extracted.The lateral incisors and canines were subjected to a significant distal force and moment,while the central incisors and canines were subjected to lingual forces and moments.Additionally,the canines were subjected to a non-designated intruding force.The molars were designed to move mesially when the bilateral second premolars were extracted.All molars were subjected to a significant mesial force,while the lingual force on the front teeth was slight.The bilateral second molars were subjected to non-design mesial moment and extrusive force.The bilateral first molars were subjected to a non-designated mesial moment,and the bilateral first premolars on both sides were subjected to non-designated intrusive force and distal moment.When one incisor was extracted,attachments on the anterior teeth had a controlling effect on the tooth axis,but the anterior teeth still tended to tilt.When the bilateral first premolars were extracted,the anterior teeth showed a tendency for lingual inclination.The risk of distal inclination of the canines and lingual inclination of the central incisor increased.When the bilateral second premolars were extracted and the posterior teeth were designed to move mesially,the teeth on both sides of the extraction sites showed an obvious bowing effect.展开更多
基金the Clinical Research Program of Ninth People’s Hospital affiliated to Shanghai Jiao Tong University School of Medicine(No.JYLJ-10)。
文摘This study was aimed at analysing the mechanical characteristics of different mandibular extraction modes using a clear aligner.Three experimental schemes of different extraction patterns were designed to treat mandibular crowding,including extraction of one mandibular central incisor,bilateral first premolars,and bilateral second premolars.The stress distribution during the space closing was analysed using the finite element method.When a central incisor was extracted,a significant retraction force was found in the anterior region,in line with the design expectation.The posterior teeth,which were designed to move mesially,acted as anchorage for anterior retraction,and were subjected to a mesial force.The anterior teeth were retracted when the bilateral first premolars were extracted.The lateral incisors and canines were subjected to a significant distal force and moment,while the central incisors and canines were subjected to lingual forces and moments.Additionally,the canines were subjected to a non-designated intruding force.The molars were designed to move mesially when the bilateral second premolars were extracted.All molars were subjected to a significant mesial force,while the lingual force on the front teeth was slight.The bilateral second molars were subjected to non-design mesial moment and extrusive force.The bilateral first molars were subjected to a non-designated mesial moment,and the bilateral first premolars on both sides were subjected to non-designated intrusive force and distal moment.When one incisor was extracted,attachments on the anterior teeth had a controlling effect on the tooth axis,but the anterior teeth still tended to tilt.When the bilateral first premolars were extracted,the anterior teeth showed a tendency for lingual inclination.The risk of distal inclination of the canines and lingual inclination of the central incisor increased.When the bilateral second premolars were extracted and the posterior teeth were designed to move mesially,the teeth on both sides of the extraction sites showed an obvious bowing effect.
