论文部分内容阅读
目的 研究 10～ 13岁儿童下切牙位置的生长变化。方法 未经治疗的儿童 18例 ,男 6例 ,女 12例。在 10岁和 13岁分别拍摄X线头颅侧位片 ,对每名儿童的前后两张头颅侧位片运用下颌结构重叠法进行研究。结果 下切牙切缘在垂直向相对于下颌平面和下颌本身有明显升高 ,相对于平面无明显变化 ;在水平向 ,相对于下颌本身下切牙切缘和牙轴均无明显变化 ,相对于前颅底平面和FH平面变得更加直立 ,而与A Pg连线保持稳定的关系。结论 在 10～ 13岁期间 ,下切牙位置无明显的唇舌向移位或倾斜 ,其切缘与A Pg连线保持稳定的关系
Objective To study the changes of the incisor position in children aged 10 ~ 13 years. Methods 18 untreated children, 6 males and 12 females. X-ray cephalograms were taken at 10 and 13 years old, respectively, and mandibular structural overlap was performed on each of the two cranial cephalograms before and after each child. Results The incisor margins of the incisors in the vertical direction were significantly higher than those in the mandibular plane and the mandible itself, with no significant changes relative to the plane. In the horizontal direction, there was no significant change in the incisor edge and the tooth axis of the mandibular incisors, Anterior skull base plane and FH plane become more upright, and with the A Pg connection to maintain a stable relationship. Conclusions During the period of 10 to 13 years, there is no obvious shift of the lower incisors or inclination of the lower incisors, and the relationship between the cut edge and the A Pg line remains stable