成人单侧后牙反牙合患者下颌及颞颌关节的对称性.doc

成人单侧后牙反牙合患者下颌及颞颌关节的对称性.doc***单侧后牙反牙合患者下颌及颞颌关节的对称性

摘要:目的研究***单侧后牙反牙合患者下颌及颞颌关节的对称性. 方法对20例***单侧后牙反牙合患者及23例正常牙合***拍摄定位颏顶位片及双侧颞颌关节中位断层片进行描记分析. 结果***单侧后牙反牙合患者在下颌坐标系中反牙合侧DMP点更靠远中及颊侧,在颅底坐标系中反牙合侧CMP,DMP点更靠远中,DMP,MM,DM点更靠侧方. 结论相对下颌坐标系,,,下颌骨向反牙合侧发生了旋转.

lusion;mandible;temporomandibular joint

Abstract:AIM To determine that found in adults al occlusion and to pare mandibular asymmetry in adults al Sub-mentovertex radiographs and horizontally corrected tomo-graphs al pared andibular coordinate system,the DMP ore distal and lateral on the crossbite parison ,CMP,DMP ore posteriorly on the crossbite ,MM,DM ore laterally located on the crossbite Relative to a mandibular coordinate system,the mandibular first molar on the crossbite side is more lateral and relatively distal in parison to the contralateral ,the mandibular andibular is“rotated”.

0 引言

后牙反牙合是一种临床常见的错牙合畸形,其中多数患者为单侧后牙反牙合,据报道在人群中的发生率为7%~23%[1] .单侧后牙反牙合可影响关节、,将导致牙列不对称,但一侧后牙反牙合是否会引起骨骼的不对称,***单侧后牙反牙合患者为对象,通过对其定位颏顶位片及双侧颞颌关节中位断层片的分析,并与正常牙合患者进行比较,研究***单侧后牙反牙合患者下颌及颞颌关节的对称性.

1 对象和方法

对象 2001-02/2001-08在我院就诊的未经正畸治疗的单侧后牙反牙合患者21(男10,女11)例,年龄18~27(),一侧后牙反牙合(其中右侧6例,左侧5例),反牙合涉及磨牙及前磨牙,伴有下颌中线向反牙合侧偏移至少1mm,并排除由牙齿移位造成的中线偏斜(牙性偏斜),另以正常牙合***23(男11,女12)人,年龄21~23(平