目的 探讨Nolla分期对青少年拔牙正畸患者下颌第三磨牙倾斜角的影响。方法 选择2018年10月—2022年10月收治的100例拔牙正畸青少年患者。100例患者均拔除了4颗前磨牙,共有100颗下颌第三磨牙,通过Nolla分期,可将100例患者分成四组,每组25例。Ⅰ组：牙冠正在形成,Ⅱ组：牙冠基本形成,Ⅲ组：牙根形成在1/2以下,Ⅳ组：牙根形成在1/2以上。在治疗前后,测量下颌第三磨牙倾斜角,对角度α的变化进行分析。结果 第三磨牙牙胚倾斜角、MP-SN、MP-FH在不同组间比较差异无统计学意义（F=0.256,P=0.857;F=0.033,P=0.992;F=0.028,P=0.994）;治疗前组间下颌第三磨牙角度比较差异无统计学意义（P>0.05）,治疗后不同组间下颌第三磨牙角比较差异有统计学意义（F=13.376,P<0.001）,治疗前后Ⅰ组、Ⅱ组、Ⅳ组第三磨牙的角度无差异（t=0.757,P=0.453;t=0.224,P=0.824;t=0.852,P=0.399）,Ⅲ组治疗后角度变化减少（t=3.697,P<0.001）。结论 青少年正畸拔牙后,下颌第三磨牙处于牙根形成阶段的一半以下可能会导致第三磨牙近中倾斜加重。当下颌第三磨牙处于牙冠形成阶段,牙冠形成超过一半时,第三磨牙角度变化较小。在治疗前应根据Nolla分期评估下颌第三磨牙的预后情况,并及时制定相应的干预策略。

Objective To explore the effect of Nolla staging on the inclination angle of mandibular third molars in adolescent orthodontic patients undergoing tooth extraction. Methods A total of 100 adolescent patients who underwent tooth extraction orthodontic treatment from October 2018 to October 2022 were included．All 100 patients had 4 premolars extracted,with a total of 100 mandibular third molars．According to Nolla staging,the 100 patients can be divided into 4 groups,with 25 cases in each group．Group I：The crown was forming,Group II：The crown was basically formed,Group III：The root formation was below 1/2,Group IV：The root formation was above 1/2．The inclination angle of the mandibular third molar was measured before and after treatment,and the angle α changes will be analyzed. Results There was no difference in the inclination angle,MP-SN,and MP-FH of the third molar tooth germ among different groups（F=0.256,P=0.857;F=0.033,P=0.992;F=0.028,P=0.994）．There was no difference in the angle of mandibular third molar teeth between groups before treatment（P>0.05）,the contrast of mandibular third molar angles between different groups after treatment was signifiant（F=13.376,P<0.001）,while the angles in Group I,Group and Group Ⅳ were not slgnificantly different（t=0.757,P=0.453;t=0.224,P=0.824;t=0.852,P=0.399）,and the angle change decreased after treatment in Group Ⅲ（t=3.697,P<0.001）. Conclusions After orthodontic extraction in adolescents,if the mandibular third molar is less than half of the root formation stage,it may lead to increased mesial inclination of the third molar．However,when the mandibular third molar is in the stage of crown formation and the crown is more than half formed,the angle change of the third molar is relatively small．Therefore,in clinical practice,Nolla staging should be evaluated in the prognosis of mandibular third molars before treatment and develop corresponding intervention strategies in a timely manner．

目的 探讨拔牙窝内填塞富血小板纤维蛋白（PRF）对双侧下颌阻生智齿拔除术后患者局部疼痛和肿胀程度的影响。方法 回顾性分析2019年10月—2022年1月于我院接受双侧下颌阻生智齿拔除术的82例患者的一般资料,按照术后有无使用PRF分为2组,每组41例。常规组41例仅给予下颌阻生智齿拔除术治疗、不使用PRF,PRF组41例在常规组基础上给予拔牙窝内填塞PRF治疗,观察2组牙周恢复情况、术后不同时间节段疼痛和肿胀情况、并发症发生率。结果 拔除前2组患者牙周袋间距（PD）和附着丧失（AL）对比差异无统计学意义（P>0.05）,随访6个月后2组PD、AL均下降且PRF组低于常规组（P<0.05）;拔除前2组患者视觉模拟评分量表（VAS）、肿胀度以及张口度均对比差异无统计学意义（P>0.05）,拔除第1、3、5、7天VAS评分、肿胀度均下降且PRF组低于常规组,张口度上升且PRF组大于常规组（P<0.05）;PRF组出血（2.44%）、感染（2.44%）以及干槽症（0.00%）的发生率略高于常规组（14.64%）、（7.32%）、（4.88%）,但组间对比差异无统计学意义（P>0.05）。结论 对双侧下颌阻生智齿拔除术后患者予以PRF填塞拔牙窝,可减轻疼痛和肿胀度,缓解张口受限,修复磨牙远中骨缺损,不影响并发症的发生率。

       目的   评估无托槽隐形矫治应用在正畸拔牙患者中的效果及对牙根吸收、可溶性细胞间黏附分子-1（sICAM-1）的影响。方法   纳入2022年1月—2024年8月的70例正畸拔牙患者，按照治疗方法分组，即对照组（35例，给予固定矫治）、观察组（35例，给予无托槽隐形矫治），评价组间牙根吸收情况、牙周指标、炎症因子、矫治时间。结果   治疗结束时，两组均出现牙根吸收情况，但是观察组无牙根吸收＞3 mm病例，而对照组存在牙根吸收＞3 mm、＞4 mm病例，P＜0.05。治疗前，两组牙周指标［龈沟出血指数（SBI）、牙龈指数（GI）、菌斑指数（PLI）］、炎症因子［白介素-1β（IL-1β）、sICAM-1］比较差异无统计学意义（P＞0.05）。治疗后，两组SBI、GI、PLI、IL-1β、sICAM-1升高，且观察组SBI、GI、PLI、IL-1β、sICAM-1低于对照组（P＜0.05）。与对照组比较，观察组矫治时间更长（P＜0.05）。结论   对正畸拔牙患者进行无托槽隐形矫治，虽然治疗时间长，但是可以抑制牙根吸收，减轻炎症反应，提高牙周健康水平。

       Objective  To evaluate the effect of clear aligner treatment on orthodontic tooth extraction patients and its impact on root resorption and soluble intercellular adhesion molecule-1（sICAM-1）．Methods  Seventy orthodontic extraction patients from January 2022 to August 2024 were included and divided into two groups according to treatment methods：a control group（35 cases，receiving fixed orthodontic treatment）and an observation group（35 cases，receiving clear aligner treatment）．The root resorption，periodontal indicators，inflammatory factors，and orthodontic treatment time between groups were evaluated．Results  At the end of treatment，both groups showed root resorption，but there were no cases of root resorption＞3 mm in the observation group，while there were cases of root resorption＞3 mm and＞4 mm in the control group，P＜0.05．Before treatment，there was no difference in periodontal indicators（gingival bleeding index［SBI］，gingival index［GI］，plaque index［PLI］），inflammatory factors（interleukin-1 β［IL-1 β］，sICAM-1） between the groups，P＞0.05．After treatment，SBI，GI，PLI，IL-1 β，sICAM-1 increased in both groups，but SBI，GI，PLI，IL-1 β，sICAM-1 were lower in the  observation group，P＜0.05．Compared with the control group，the observation group had a longer orthodontic treatment time，P＜0.05．Conclusions  Although the clear aligner treatment time for orthodontic extraction patients is longer，it can inhibit root resorption，reduce inflammatory reactions，and improve periodontal health．