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目的探讨女性安氏Ⅱ类错伴颞下颌关节紊乱病(temporomandibular disorders,TMD)患者的髁突位置。方法收集26例女性安氏Ⅱ类错伴有临床症状的TMD患者,利用锥形束CT(cone beam computed temography,CBCT)对患者的双侧颞下颌关节进行扫描,测量颞下颌关节前、上、后、外、内间隙,分析髁突位置。结果26例女性安氏Ⅱ类错伴TMD患者颞下颌关节各间隙间左右侧之间均无统计学意义(P>0.05),两侧颞下颌关节间隙合并统计,前、上、后、外、内间隙分别为(2.343±0.827)mm,(2.138±0.807)mm,(1.959±0.757)mm,(1.764±0.609)mm,(2.103±0.663)mm;通过计算ln(P/A)值和线性比率(linear ratio,LR)得出髁突后移位分别占50%、48%。结论女性安氏Ⅱ类错畸形患者髁突在关节窝内处于后位可能是导致TMD的原因之一。
Objective To investigate the condylar position of female patients with Class Ⅱ malocclusion and temporomandibular disorders (TMD). Methods Twenty-six female patients with TMD class Ⅱ malocclusion accompanied with clinical symptoms were collected. The bilateral temporomandibular joint was scanned by cone beam computed temography (CBCT), and the anterior and posterior temporomandibular joint After, outside, within the gap, analysis of condylar position. Results There was no significant difference between the left and right sides of the temporomandibular joint space in 26 female patients with Class Ⅱ malocclusion and TMD (P> 0.05). The temporomandibular joint space on both sides was statistically analyzed. The anterior, upper, (2.343 ± 0.827) mm, (2.138 ± 0.807) mm, (1.959 ± 0.757) mm, (1.764 ± 0.609) mm and (2.103 ± 0.663) mm, respectively. The ln (P / A) The linear ratio (LR) resulted in condylar posterior displacement of 50% and 48%, respectively. Conclusions Female condyles of Class Ⅱ malocclusion in posterior position may be one of the causes of TMD.