Objectives:To determine the most effective ways to correct lower lip sucking in preschool children, minimizing impacts on their Oral Health-Related Quality of Life (OHRQoL) and improving malocclusion. Materials and Methods:83 children aged 3-6 years were divided into behavioral therapy (Group A, n = 27), lip bumper therapy (Group B, n = 27), and Twin Block therapy (Group C, n = 29) groups. After 6 months of treatment, oral exams, model analysis, cephalometrics, and the Early Childhood Oral Health Impact Scale (ECOHIS) were used for assessment. Results:Success rates in Groups A, B, and C were 33.33%, 73.08%, and 96.43%, respectively (P < .05). Groups A and B had no significant measurement differences (P > .05). Group C showed significant changes in overjet, SNA, SNB, ANB, U1SN, and L1MP (P < .05). The ECOHIS scores of all groups first rose, then fell (P < .05). Conclusions:Twin Block appliances are highly effective for correcting lower lip sucking. They have a higher success rate than other methods and can reduce skeletal malocclusion severity in children with specific dental conditions.

Enamel white spot lesions (WSLs) not only compromise the efficacy of orthodontic treatments but also pose risks to dental health. Although clear aligners offer the advantage of facilitating oral hygiene maintenance, their full-coverage crown design impedes the self-cleaning function of saliva, potentially leading to extensive white spot formation. This study pioneers the application of a PA@PEI-Cl coating to transparent aligners. A colloidal polymer formed via electrostatic interactions between phytic acid (PA) and polyethyleneimine (PEI), combined with a broad-spectrum antibacterial N-halamine polymer, enables this coating to achieve synergistic antibacterial efficacy. The preparation protocols and reaction conditions were optimized in detail. Systematic experiments confirmed the stable adhesion of coating to aligners and the long-lasting antibacterial performance, enhancing the safety of orthodontic treatment. This simple and low-cost method is suitable for large-scale industrial production. It provides an innovative solution to enhance aligner functionality and demonstrates a significant clinical potential for preventing orthodontic complications.

龋病是多因素疾病,由宿主、微生物和饮食3种致病因素在足够的时间内相互作用的结果,是造成缺牙的主要原因之一,需要开展针对其病因以预防为主、防治结合的工作.随着西药诸多不良反应及耐药性的产生,中药以其"天然药物"的特性,在防龋抑菌方面具有独特的优势,对多种口腔致病菌具有抑制、杀灭作用.中药毒副作用小、取材广泛、疗效显著,应用于防龋及口腔护理具有科学理论依据及广阔的市场前景.本文就厚朴、五倍子、茶、蜂胶、紫地榆、柠檬等药物的有效成分、防龋机制及应用前景等内容进行归纳性的综述.

Completely digital design/completely digital manufacturing (CDD/CDM) workflows have been widely used in orthodontic and orthognathic treatments. This case report introduces a CDD/CDM workflow consisting of clear aligners and virtual planning for a surgery-first approach (SFA) in a patient with a skeletal Class III malocclusion. Following a shortened treatment time of 5 months, the patient's facial appearance improved significantly, and well-balanced occlusion was obtained. SFAs with clear aligners can enable patients to achieve complete esthetic satisfaction during the therapeutic period. The CDD/CDM workflow provided accurate results, improved the clinical outcome, and reduced treatment time.

The aim of this study was to compare the difference in length and width of the mandibular retromolar space (RMS) stratified by the different eruption and impaction statuses of the third molars in patients with skeletal Class I malocclusion. The right mandibular RMS in 186 adult patients categorized according to the different statuses of the third molar was analyzed by using cone-beam computed tomography (CBCT). The shortest distances between the inner lingual cortex of the mandibular body and second molar root were measured parallel to the posterior occlusal line (POL) at depths of 2, 4, 6, 8, and 10 mm (mandibular retromolar space length in root level, RLin2,4,6,8,10) on the axial slices with the cementoenamel junction (CEJ) as the reference level. The width of the RMS and second molar root was measured vertical to the POL at the terminal point of the molar distalization at depths of 2, 4, 6, 8, and 10 mm (width of the mandibular retromolar space, BW2,4,6,8,10/ width of the second molar distal root, TW2,4,6,8,10) from the CEJ. RL in different measurement planes was 2.72 ± 2.22 3.74 ± 2.26 for Group A, 5.27 ± 1.68 9.10 ± 2.04 for Group B, 1.94 ± 2.34 5.71 ± 4.37 for Group C, 1.83 ± 2.95 5.05 ± 4.24 for Group D, and 5.93 ± 3.97 10.52 ± 2.16 for Group E. The BW measurement results for A E group were 9.71 ± 1.41 10.51 ± 1.81, 9.83 ± 1.39 12.55 ± 2.11, 9.96 ± 1.21 12.17 ± 1.62, 9.82 ± 1.47 12.28 ± 2.77, and 10.02 ± 1.20 12.75 ± 0.82, respectively. There was no significant difference between men and women in any measurements (P > 0.05). Patients with normal third molars erupted and those vertically impacted possessed larger RMS lengths than those in which the third molars were missing, horizontally impacted or mesially impacted (P < 0.05). In each measurement plane, TW was significantly smaller than BW (P < 0.05). Sex had no effect on the length or width of the mandibular RMS. Different statuses of third molars can also differentially affect the mandibular RMS. The mandibular RMS width is not a limit for mandibular molar distalization. When considering the distalization of mandibular molars, more attention should be directed to the lingual cortex of the mandible, and CBCT scans are recommended for patients who require significant mandibular molar distalization. The mandible buccal shelf and retromolar area maybe a safe zone to insert the miniscrew for molar distalization.

目的 探讨混合牙列期无托槽隐形矫治器的扩弓效率.方法 选取2019年至2021年于青岛大学附属医院口腔正畸科就诊并使用隐形矫治器扩弓的混合牙列患者32例,收集矫治前、排牙预置及矫治后的三维数字化模型,分别测量上下颌牙尖水平和龈缘水平牙弓宽度及磨牙颊倾度,计算各牙位扩弓效率.配对样本t检验比较矫治前、排牙预置及矫治后牙弓差异宽度.结果 矫治后各牙位牙弓宽度显著增加(P<0.05),上颌乳尖牙、第一乳磨牙、第二乳磨牙、第一恒磨牙区牙尖水平扩弓效率分别为69％、70％、71％、61％,龈缘水平扩弓效率分别为63％、55％、59％、47％;下颌相应牙位牙尖水平扩弓效率分别为84％、78％、76％、69％,龈缘水平分别为69％、68％、64％、56％.矫治后上颌第一恒磨牙颊倾(1.19±3.56)°,下颌第一磨牙颊倾(5.54±3.03)°,实际颊倾量大于预置值(P<0.05).结论 隐形矫治器能在替牙期实现有效的上下颌扩弓,乳尖牙及乳磨牙区扩弓效率较高,龈缘水平扩弓效率低于牙尖水平,第一恒磨牙实际颊倾量大于预置值.

Objective:To investigate the size of mandibular retromolar space, and its relation with the status of the third molar.Methods:Using cone-beam computed tomography, the right posterior retromolar region were measured in three dimensions in 86 adult patients with a skeletal Class Ⅰ normodivergent pattern. All patients were divided based on the different status of the right third molar. Distance between second molar crown to the anterior border of the ramus was measured at the crown level and 2 mm apically lower level along the posterior occlusal line (POL, which connects the buccal cusps of the mandibular first and second molars). Distance between second molar root to lingual inner cortical bone was measured at levels of 2 mm, 4 mm, 6 mm, 8 mm and 10 mm apically to the CEJ border along the POL, respectively.Results:In all groups (no third molar group, normal eruption group, horizontal impaction group, mesial impaction group, and vertical impaction group) the distance at the crown levels were significantly larger than that at root levels. Among all measurement levels, the space measured in normal eruption group and vertical impaction group were no less than that in the other three groups (no third molar group, horizontal impaction group and mesial impaction group).Conclusions:When considering the distalization of mandibular molars, more attention should be directed to the lingual cortical bone of the mandible. The diagnosis accuracy of cone-beam computed tomography is higher compared with that of two-dimensional radiographs. In addition, different status of third molars, whether eruption of impaction, can also affect molar distalization.