■上颌第一恒磨牙(FPM)异位萌出(EE)的病因仍不清楚且存在争议。本研究旨在探讨儿童FPMEE的牙齿和骨骼因素。
■招募6-10岁儿童参加本研究。受试者被分配到异位爆发组(EEG)和正常爆发组(NEG)。通过角度和线性指数测量侧位头颅X射线照片和全景X射线照片。
■上颌FPM的EE患病率在男性和年轻年龄段较高。患有骨骼III类错牙合的受试者更有可能被诊断为上颌FPM的EE。SNA,ANB,FMIA,Wits,Ptm-A,ANS-PNS,过位,EEG和NEG之间的过度喷射显着不同。上颌牙槽骨后部的长度,U6-OP,上颌FPM的萌出角度在两组之间有统计学差异。
■男性,骨骼III类错牙合,上颌FPM的中斜,上颌骨发育不全,上颌牙槽骨后部长度不足与上颌FPM的EE有关。
UNASSIGNED: The etiology of the ectopic eruption (EE) of the maxillary first permanent molars (FPM) remains unclear and controversial. This study was designed to explore the dental and skeletal factors for EE of the FPM in children.
UNASSIGNED: Children aged 6-10 years were recruited to this study. Subjects were assigned to the ectopic eruption group (EEG) and the normal eruption group (NEG). Lateral cephalometric radiographs and panoramic radiographs were measured by angular and linear indices.
UNASSIGNED: The prevalence of EE of maxillary FPM was higher in males and at younger ages. Subjects with skeletal class III malocclusion were more likely to be diagnosed with EE of maxillary FPM. The SNA, ANB, FMIA, Wits, Ptm-A, ANS-PNS, overbite, and overjet were significantly different between the EEG and the NEG. The length of the posterior region of the maxillary alveolar bone, U6-OP, and eruptive angulation of the maxillary FPM were statistically different between the two groups.
UNASSIGNED: Male sex, skeletal class III malocclusion, mesial inclination of the maxillary FPM, hypoplasia of the maxilla, and insufficient length of the posterior region of the maxillary alveolar bone were related to EE of the maxillary FPM.