CAJ | 학술논문

目的对骨性Ⅲ类错(牙合)患者下颌模型进行三维扫描并测量,评估其牙弓形态与基骨形态的相关性及个体差异,以期指导临床治疗.方法选取29例骨性Ⅲ类错(牙合)患者下颌模型进行激光扫描,建立三维模型.对下颌右侧第一磨牙至下颌左侧第一磨牙的FA点(临床冠中心点)、WALA点(膜龈联合(牙合)方的软组织带处最凸点)进行标定,并分析FA曲线和WALA曲线所对应的牙弓形态与基骨形态.结果骨性Ⅲ类错(牙合)的下颌FA曲线与WALA曲线显著正相关(r尖牙区=0.616;r磨牙区=0.818).前牙区WALA曲线的曲率半径(23.07)大于FA曲线的曲率半径(19.22).左右侧尖牙区和左右侧第一磨牙区FA点的变异系数(分别为10.00％、13.97％和5.99％、6.36％)均大于相应区域WALA点的变异系数(分别为7.57％、8.60％和3.78％、5.07％).FA点和WALA点尖牙区变异系数均大于第一磨牙区变异系数.结论骨性Ⅲ类错(牙合)下颌牙弓形态与对应的基骨形态显著相关,且尖牙区的个体差异较磨牙区的个体差异大,因此正畸治疗时不能仅考虑牙弓形态,还应多考虑基骨形态对治疗的影响.
목적 대골성Ⅲ류착(아합)환자하합모형진행삼유소묘병측량,평고기아궁형태여기골형태적상관성급개체차이,이기지도림상치료.방법 선취29례골성Ⅲ류착(아합)환자하합모형진행격광소묘,건립삼유모형.대하합우측제일마아지하합좌측제일마아적FA점(림상관중심점)、WALA점(막간연합(아합)방적연조직대처최철점)진행표정,병분석FA곡선화WALA곡선소대응적아궁형태여기골형태.결과 골성Ⅲ류착(아합)적하합FA곡선여WALA곡선현저정상관(r첨아구=0.616;r마아구=0.818).전아구WALA곡선적곡솔반경(23.07)대우FA곡선적곡솔반경(19.22).좌우측첨아구화좌우측제일마아구FA점적변이계수(분별위10.00％、13.97％화5.99％、6.36％)균대우상응구역WALA점적변이계수(분별위7.57％、8.60％화3.78％、5.07％).FA점화WALA점첨아구변이계수균대우제일마아구변이계수.결론 골성Ⅲ류착(아합)하합아궁형태여대응적기골형태현저상관,차첨아구적개체차이교마아구적개체차이대,인차정기치료시불능부고필아궁형태,환응다고필기골형태대치료적영향.
Objective To evaluate the relationship between the dental and arch forms of patients with Skeletal Class Ⅲ malocclusion using three-dimensional(3-D) virtual models.Methods 3-D graphic representations of mandibular casts from 29 Skeletal Class Ⅲ malocclusion patients were created using a laser scanning system.Anatomic reference points were subjectively identified and used to represent the dental arch and the arch form of the basal bone.Results For Skeletal Class Ⅲ malocclusion,a high relationship between the FA(facial axis) and WALA(Will Andrews and Larry Andrew) curves was found.WALA curve's radius of curvature in anterior teeth area was larger than that in FA curve's (rWALA =23.07 ＞ rFA =19.22).In the areas of canine and molar,the coefficients of variations of FA were greater than those of WALA.For both FA and WALA points,the CV of canine areas was larger than the CV of molar areas.Conclusions For Skeletal Class Ⅲ malocclusion patients,high correlation was found between the dental arch form and the basal arch form which can be reflected by FA and WALA points.The basal arch,represented by WALA points,can be used as a clinical guide in making individualized archwire.Both FA and WALA curves were individual and these individual differences were found largely in canine areas.