American Journal of Orthodontics and Dentofacial Orthopedics最新文献

英文中文

Second molar eruption disturbances in borderline extraction orthodontic patients. 边缘拔牙矫正患者的第二磨牙萌出障碍。

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-06 DOI: 10.1016/j.ajodo.2024.06.016

Thomas Patrick, Kylie Stickrath, John Christensen, Laura Jacox, Kelly Mitchell

Introduction: Nonextraction treatment is associated with a greater prevalence of third molar impactions, whereas data on second molars are lacking. This study investigated whether there is a difference in the prevalence of second molar eruption disturbances when crowding is treated with or without extractions.

Methods: Patients were grouped by maxillary and mandibular crowding, including mild crowding (<5 mm) without extractions, borderline crowding (5-9 mm) without extractions, and borderline crowding with extractions. The 535 evaluated arches were from 346 patients aged 10-15 years with unerupted second molars at treatment start. The frequency and severity of second molar eruption disturbances were scored in final records using a severity classification based on a modified Archer system, a hybrid Archer Pell-Gregory system, and a partial impaction scale. Pretreatment panoramic radiographs were scored for impaction-risk indicators. Fisher exact test was used.

Results: In the maxilla, 20.0% of nonextraction patients with borderline crowding had second molar eruption disturbances compared to 5.2% of extraction patients with borderline crowding (P = 0.010). In the mandible, 27.6% of nonextraction borderline crowding patients had second molar eruption disturbances compared to 7.1% of extraction patients with borderline crowding (P = 0.006). There was no difference in the frequency of eruption disturbances between mild crowding without extractions and borderline crowding without extractions. The prevalence of impactions was higher in the maxilla when molars were apically positioned and in the mandible when molars were mesially angulated or had insufficient space pretreatment.

Conclusions: In patients with borderline crowding, extraction treatment reduces the risk of second molar eruption disturbances; however, nonextraction treatment does not increase the risk when compared with patients with mild crowding. When considering extractions for crowding, providers should evaluate second molar impaction-risk indicators on pretreatment radiographs.

导言：不拔牙治疗与第三磨牙撞击的发生率较高有关，而第二磨牙的相关数据则缺乏。本研究调查了在对牙列拥挤进行拔牙治疗或不拔牙治疗时，第二磨牙萌出障碍的发生率是否存在差异：方法：将患者按上颌和下颌牙列拥挤（包括轻度拥挤）进行分组（结果：在上颌，20.0%的患者接受了拔牙治疗；在下颌，20.0%的患者接受了拔牙治疗：在上颌，20.0%的边缘拥挤非拔牙患者有第二磨牙萌出障碍，而边缘拥挤拔牙患者中只有5.2%有第二磨牙萌出障碍（P = 0.010）。在下颌，27.6%的边缘拥挤非拔牙患者有第二磨牙萌出障碍，而边缘拥挤拔牙患者的这一比例为7.1%（P = 0.006）。未拔牙的轻度拥挤患者和未拔牙的边缘拥挤患者发生臼齿萌出紊乱的频率没有差异。上颌磨牙根尖位置较高时，撞击发生率较高，而下颌磨牙中位成角或治疗前空间不足时，撞击发生率较高：对于边缘拥挤的患者，拔牙治疗可降低第二磨牙萌出紊乱的风险；但与轻度拥挤的患者相比，不拔牙治疗并不会增加风险。在考虑拔牙治疗牙列拥挤时，牙医应评估治疗前X光片上的第二磨牙嵌入风险指标。

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引用次数: 0

Soft-tissue profile changes in adult patients treated with premolar extractions 接受前磨牙拔除治疗的成年患者的软组织轮廓变化。

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.04.011

Introduction

The objective of this study was to identify the soft-tissue profile changes and the potential pretreatment cephalometric parameters that clinicians could use to predict the lip response after premolar extraction treatment in adult patients.

Methods

Pretreatment and posttreatment lateral cephalograms of 75 white patients treated with premolar extractions were analyzed. The following initial cephalometric measurements were recorded: upper and lower lip to E-plane, vermilion thickness, lip length, maxillary and mandibular incisor inclination, and mentolabial and nasolabial angle. Pretreatment and posttreatment radiographs were superimposed using the Björk structural method to record lip retraction and incisor/lip retraction ratio. Pearson correlation and Kruskal-Wallis tests were used to compare lip retraction and incisor/lip retraction ratio with the cephalometric variables. The sample was divided according to different extraction patterns.

Results

The mean upper and lower lip retraction values were 1.4 mm and 1.7 mm, respectively. Vermilion thickness showed a negative and statistically significant correlation (P <0.05) with lip retraction and incisor/lip retraction ratio. In addition, the mean incisor/lip retraction ratio was 61% and 98% for the upper and lower thin lip, respectively, whereas the mean incisor/lip retraction ratio was 17% and 44% for the upper and lower thick lip, respectively. The comparison among extraction patterns did not highlight any noticeable difference.

Conclusions

The choice of a specific extraction pattern did not impact lip response. The vermilion thickness was the key factor influencing lip retraction: an increase in this parameter was related to a decrease in lip retraction and vice versa.

简介本研究的目的是确定软组织轮廓的变化和潜在的治疗前头形测量参数，供临床医生用于预测成年患者前磨牙拔除治疗后的唇部反应：方法：分析了 75 名接受前磨牙拔除治疗的白人患者的治疗前和治疗后侧头像。方法：对 75 名接受前磨牙拔除治疗的白人患者的治疗前和治疗后的头颅侧位片进行分析，记录了以下初始头颅测量值：上下唇到 E 平面、朱砂厚度、唇长、上颌和下颌切牙倾斜度以及门唇角和鼻唇角。采用比约克结构法对治疗前和治疗后的X光片进行叠加，以记录嘴唇后缩和门牙/嘴唇后缩比。使用皮尔逊相关检验和 Kruskal-Wallis 检验来比较唇后缩和门牙/唇后缩比率与头颅测量变量。根据不同的拔牙模式对样本进行了划分：结果：上下唇退缩的平均值分别为 1.4 毫米和 1.7 毫米。朱砂厚度呈负相关，且在统计学上有显著意义（P 结论：朱砂厚度与上下唇后缩的平均值呈负相关，且在统计学上有显著意义：选择特定的拔牙方式不会影响唇部反应。朱砂厚度是影响嘴唇回缩的关键因素：该参数的增加与嘴唇回缩的减少有关，反之亦然。

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引用次数: 0

Caffeine induces alveolar bone loss in rats submitted to orthodontic movement via activation of receptor activator of nuclear factor ҡB, receptor activator of nuclear factor ҡB ligand, and osteoprotegerin pathway 咖啡因通过激活核因子ҡB受体激活剂、核因子ҡB受体激活剂配体和骨保护蛋白途径诱导正畸大鼠牙槽骨流失

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.04.009

Introduction

Caffeine is a widely consumed substance with several effects on bone metabolism. This study aimed to investigate the effect of caffeine on the bone tissue of rats submitted to orthodontic movement.

Methods

Twenty-five male Wistar rats underwent orthodontic movement (21 days) of the first permanent maxillary molars on the left side. The experimental group (caffeine; n = 13) and control group (n = 12) received caffeine and water, respectively, by gavage. Microcomputed tomography was performed to analyze orthodontic movement. Histologic analysis of the inflammatory infiltrate and osteoclast count by tartrate-resistant acid phosphatase were conducted. Maxilla tissue was evaluated for receptor activator of nuclear factor ҡB (RANK), RANK ligand (RANKL), and osteoprotegerin by immunohistochemistry.

Results

Caffeine exhibited a lower bone volume/tissue volume ratio (78.09% ± 5.83%) than the control (86.84% ± 4.89%; P <0.05). Inflammatory infiltrate was increased in the caffeine group compared with the control group (P <0.05). A higher number of tartrate-resistant acid phosphatase-positive cells was observed in the caffeine (9.67 ± 1.73) than in the control group (2.66 ± 0.76; P <0.01). Immunoexpression of RANK and RANKL in the caffeine group was greater than the control (P <0.05).

Conclusions

The use of caffeine thermogenic induces alveolar bone loss in rats submitted to orthodontic movement via activation of RANK, RANKL, and osteoprotegerin signaling pathways.

引言咖啡因是一种广泛食用的物质，对骨代谢有多种影响。本研究旨在探讨咖啡因对正畸大鼠骨组织的影响。实验组（咖啡因；n = 13）和对照组（n = 12）分别灌胃咖啡因和水。进行微计算机断层扫描分析正畸运动。用抗酒石酸磷酸酶对炎症浸润和破骨细胞计数进行组织学分析。结果咖啡因的骨体积/组织体积比（78.09% ± 5.83%）低于对照组（86.84% ± 4.89%；P <0.05）。与对照组相比，咖啡因组的炎症浸润增加（P <0.05）。与对照组（2.66 ± 0.76；P <0.01）相比，咖啡因组（9.67 ± 1.73）的耐酒石酸磷酸酶阳性细胞数量更多。咖啡因组中 RANK 和 RANKL 的免疫表达高于对照组（P <0.05）。结论使用咖啡因致热剂可通过激活 RANK、RANKL 和骨保护蛋白信号通路诱导正畸大鼠牙槽骨流失。

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引用次数: 0

Regarding the influence of facial width on the perception of lip protrusion 关于面部宽度对嘴唇突出感知的影响。

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.05.004

引用次数: 0

Regarding treatment change comparisons between skeletal Class I and II relationships in white adolescents with 3 different vertical divergencies 关于患有 3 种不同垂直偏斜的白人青少年骨骼 I 级和 II 级关系的治疗变化比较。

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.05.005

引用次数: 0

Are changes in malocclusion associated with adulthood psychosocial well-being? 错牙合畸形的变化与成年后的社会心理健康有关吗？

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.04.013

Introduction

The purpose of this study was to investigate the longitudinal psychosocial effects of changes in malocclusion from adolescence to adulthood on oral health–related quality of life (OHRQOL), self-rated dental appearance, and overall life satisfaction.

Methods

The Dunedin Multidisciplinary Health and Development Study is a longitudinal birth cohort study of 1037 children born at Queen Mary Hospital, Dunedin, New Zealand, between April 1, 1972 and March 31, 1973. Data on their health and development, including dental examinations, has since been collected periodically. Malocclusion severity was measured using the Dental Aesthetic Index in participants aged 15 and 45 years (data collected at age 18 years was supplemented for data missing at age 15 years). Other data collected included clinically assessed oral health (dental caries and periodontal disease experience) and self-rated dental appearance, OHRQOL, life satisfaction, and personality traits.

Results

Malocclusion data were available for 868 participants in adolescence and 834 aged 45 years. For those with a severe handicapping malocclusion at 15 years old, 46.6% who received orthodontic treatment transitioned to a resolved (ie, mild-moderate) malocclusion when aged 45 years, whereas only 16.2% of those who did not receive orthodontic treatment made that transition. A transition to a worse malocclusion was associated with impacts on OHRQOL when aged 45 years in the subdomains of functional limitation, psychological discomfort, and physical disability as well as worse self-ratings of dental appearance, and these findings were held after adjusting for potential confounders. Malocclusion was not associated with overall life satisfaction.

Conclusions

Maintenance of acceptable occlusion after orthodontic treatment requires a strong emphasis on achieving and maintaining excellent dental health and avoiding chronic oral conditions such as dental caries and tooth loss. The long-term benefits of orthodontic treatment may diminish by midlife unless good dental health is maintained. Orthodontists have the responsibility to raise awareness among their patients on how to maintain good oral health after orthodontic treatment.

简介本研究的目的是调查从青春期到成年期错牙合畸形的变化对口腔健康相关生活质量（OHRQOL）、自评牙齿外观和总体生活满意度的纵向社会心理影响：达尼丁多学科健康与发展研究是一项纵向出生队列研究，研究对象是1972年4月1日至1973年3月31日期间在新西兰达尼丁玛丽皇后医院出生的1037名儿童。此后，研究人员定期收集他们的健康和发育数据，包括牙科检查数据。对 15 岁和 45 岁的参与者使用牙齿美学指数测量咬合不正的严重程度（15 岁时缺失的数据由 18 岁时收集的数据补充）。收集的其他数据包括临床评估的口腔健康状况（龋齿和牙周病经历）以及自评的牙齿外观、OHRQOL、生活满意度和个性特征：有 868 名青少年和 834 名 45 岁参与者的错合畸形数据。对于 15 岁时有严重障碍性错颌畸形的人来说，接受过正畸治疗的人中有 46.6% 在 45 岁时过渡到了已解决的（即轻度-中度）错颌畸形，而没有接受正畸治疗的人中只有 16.2% 实现了这种过渡。在45岁时，向更严重的错颌畸形转变与功能受限、心理不适和身体残疾等子领域的OHRQOL影响以及牙齿外观的自我评分变差有关，在调整了潜在的混杂因素后，这些结果仍然成立。咬合不正与总体生活满意度无关：结论：在正畸治疗后保持可接受的咬合需要高度重视实现和保持良好的牙齿健康，避免慢性口腔疾病，如龋齿和牙齿脱落。除非保持良好的牙齿健康，否则正畸治疗的长期益处可能会在中年时减弱。正畸医生有责任提高患者对正畸治疗后如何保持良好口腔健康的认识。

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引用次数: 0

August 2024 2024 年 8 月

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.06.006

引用次数: 0

Comparison of alignment efficiency of different sizes of superelastic nickel-titanium archwires in the initial phase of fixed orthodontic treatment: A single-center, double-blind randomized clinical trial 比较不同尺寸的超弹性镍钛弓丝在固定正畸治疗初期的矫治效率：单中心双盲随机临床试验。

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.04.003

Introduction

This 3-arm parallel, double-blind study aimed to evaluate the alignment efficiency of 3 different diameters of superelastic nickel-titanium (NiTi) archwires during the initial phase of orthodontic treatment.

Methods

Ninety-three patients with nonextraction treatment in the mandibular arch (using 0.022-in Roth prescription brackets) were randomly allocated into 3 groups: 0.012-in NiTi (group 1), 0.014-in NiTi (group 2), and 0.016-in NiTi (group 3). The alignment change was measured using the modified Little’s irregularity index before archwire placement and every 4 weeks. The alignment efficiency of the 3 groups was analyzed.

Results

Ninety patients were analyzed (group 1: n = 29, group 2: n = 31, and group 3: n = 30; overall mean age, 16.6 years). The overall Wald test analysis revealed that wire type was not statistically significant (P = 0.91), whereas time exhibited significance as expected (P <0.001). Furthermore, the interaction between wire type and time was not significant (P = 0.93). The time-adjusted estimated difference between 0.014-in and 0.012-in was −0.49 (95% confidence interval, −2.83 to 1.85; P = 0.68). The time-adjusted estimated difference between 0.016-in and 0.012-in was −0.45 (95% confidence interval, −2.95 to 2.05; P = 0.72). No harm was observed.

Conclusions

The clinical performance of 3 different sizes of NiTi archwires was similar. In addition, 0.014-in and 0.016-in NiTi archwires demonstrated better performances in aligning any irregularities because of a greater number of wire deformations in the 0.012-in group.

Registration

IR.TBZMED.REC.1395.1039.

Protocol

The protocol was not published before trial commencement.

Funding

None.

简介：这项三臂平行双盲研究旨在评估正畸治疗初期3种不同直径的超弹性镍钛（NiTi）弓丝的矫治效率：93名下颌弓非拔牙治疗患者（使用0.022英寸的罗氏处方托槽）被随机分为3组：0.012英寸镍钛（第1组）、0.014英寸镍钛（第2组）和0.016英寸镍钛（第3组）。在安装弓丝前和每 4 周使用改良的 Little 不整齐指数测量对合变化。对 3 组患者的对合效率进行了分析：分析了 90 名患者（第 1 组：n = 29，第 2 组：n = 31，第 3 组：n = 30；总平均年龄为 16.6 岁）。总体 Wald 检验分析表明，导线类型无统计学意义（P = 0.91），而时间则表现出预期的显著性（P 结论：导线类型和时间具有统计学意义：三种不同尺寸的镍钛弓丝的临床表现相似。此外，0.014 英寸和 0.016 英寸镍钛弓丝在对齐任何不规则情况方面表现更佳，因为 0.012 英寸组的钢丝变形数量更多：注册：IR.TBZMED.REC.1395.1039.协议：试验开始前未公布试验方案：无。

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引用次数: 0

Directory: AAO Officers and Organizations 目录：AAO 官员和组织

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/S0889-5406(24)00264-6

引用次数: 0

Authors’ response 作者回复。

IF 2.7 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-08-01 DOI: 10.1016/j.ajodo.2024.04.008

引用次数: 0

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