唇膏(LB)疗法被用作轻度至中度拥挤而不拔牙的治疗方法。先前的研究表明,LB通过磨牙直立和横向扩张增加了牙弓长度。然而,LB对下颌切牙的影响尚无定论。来自不同研究的有争议的结果可能是由于限制,包括缺乏对照组和/或使用2D射线照相术。为了解决这个问题,当前的回顾性纵向CBCT研究比较了没有较低治疗的快速上颌扩张(RME)组[16例患者(9例女性,7名男性);T1时中位年龄8.86岁,T2时中位年龄11.82岁]和RME+LB组[18名患者(13名女性,5名男性);T1时平均年龄9.46岁,T2时平均年龄12.10岁]。1期治疗前后的CBCT基于下颌结构进行3D叠加,并进行测量以确定在LB治疗过程中下颌切牙的角度和线性变化。对于组内不同时间点之间的比较,使用Wilcoxon配对配对符号秩检验。对于组间比较,使用了Mann-WhitneyU检验。观察期间两组均出现下颌切牙萌出和突出,而下切牙的前倾没有显着变化。当比较组间变化的差异时,检测到差异无统计学意义。总之,通过利用纵向3D数据库,目前的研究表明,LB对下颌切牙位置的影响是有限的。
Lip bumper (LB) therapy is used as a treatment approach for mild to moderate crowding without extraction of teeth. Previous studies demonstrated that LB increases arch length through molar uprighting and lateral expansion. However, the effects of LB on mandibular incisors are inconclusive. The controversial results from different studies may be due to limitations including absence of a control group and/or use of 2D radiography. To address this issue, the current retrospective longitudinal CBCT
study compared a rapid maxillary expansion (RME) group with no lower treatment [16 patients (9 females, 7 males); median age 8.86 years at T1 and 11.82 years at T2] and an RME + LB group [18 patients (13 females, 5 males); median age 9.46 years at T1 and 12.10 years at T2]. The CBCTs taken before and after phase 1 treatment were 3D superimposed based on the mandibular structure and were measured to determine the angular and linear changes of the mandibular incisors over the course of LB treatment. For comparisons between different timepoints within a group, a Wilcoxon matched-pairs signed rank test was used. For intergroup comparisons, a Mann-Whitney U test was used. Both groups showed eruption and protrusion of the mandibular incisors during the observation period, while there was no significant change in proclination of the lower incisors. When comparing the discrepancy of change between groups, there was no statistically significant difference detected. In summary, by utilizing a longitudinal 3D database, the current
study demonstrated that the effect of LB on the position of the mandibular incisors is limited.