American Journal of Orthodontics and Dentofacial Orthopedics最新文献

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Individual patient data meta-analysis: An example 个体患者数据荟萃分析：举例说明

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-20 DOI: 10.1016/j.ajodo.2024.09.003

Yu-Kang Tu , Nikolaos Pandis , Loukia Spineli

引用次数: 0

On being accommodating 关于包容

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-20 DOI: 10.1016/j.ajodo.2024.09.002

Laurance Jerrold

引用次数: 0

Keep it neutral 保持中立。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-20 DOI: 10.1016/j.ajodo.2024.09.001

Peter M. Greco

引用次数: 0

December 2024 2024 年 12 月

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-20 DOI: 10.1016/j.ajodo.2024.10.004

Dr Allen H. Moffitt (CE Editor)

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Information for readers 读者须知

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-20 DOI: 10.1016/S0889-5406(24)00450-5

引用次数: 0

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 : 2024-11-01 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

Information for readers 读者须知

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-01 DOI: 10.1016/S0889-5406(24)00405-0

引用次数: 0

Is Hooke’s law applicable to an orthodontic cantilever? 胡克定律是否适用于正畸悬臂？

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-01 DOI: 10.1016/j.ajodo.2024.06.018

Hyung-Kyu Noh, Chang-Seok Park, Ho-Jin Kim, Hyo-Sang Park

Introduction

This study aimed to analyze the load-deflection characteristics of an orthodontic cantilever by using the large deflection elastic model.

Methods

We experimentally measured the vertical deflections of a cantilever with round or rectangular cross-sections, with lengths of 20 mm and 30 mm, and made of either stainless steel or titanium molybdenum alloy. The measurements were obtained under clinically relevant loading ranges (20-60 g of force for round and 20-140 g of force for rectangular wires) and compared with theoretical predictions derived from small and large deflection elastic models. Load-deflection and tangent stiffness curves were subsequently plotted.

Results

The impact of a permanent deformation was clinically insignificant. The stiffness of the cantilever increased with the load or deflection rather than remaining constant. Within the clinical loading range, we identified stiffness reversal loading values at which the stiffness of titanium molybdenum alloy surpassed that of stainless steel. The textbook guidelines on cantilevers can apply only when the vertical deflection remains within 16% of its length.

Conclusions

Within the typical clinical loading range, the load-deflection relationship of a cantilever deviates from Hooke’s law because of the prominent deflection trait. The conventional model remains effective when the vertical deflection is within 16% of the cantilever length. Otherwise, it is advisable to determine the load and stiffness on the basis of actual measurements rather than relying on theoretical predictions.

引言本研究旨在利用大挠度弹性模型分析正畸悬臂的载荷-挠度特性：我们通过实验测量了长度为 20 毫米和 30 毫米的圆形或矩形悬臂的垂直挠度，悬臂由不锈钢或钛钼合金制成。测量结果是在临床相关的加载范围（圆形丝 20-60 g 力，矩形丝 20-140 g 力）下获得的，并与根据小挠度和大挠度弹性模型得出的理论预测值进行了比较。随后绘制了载荷-挠度和切线刚度曲线：结果：永久变形对临床影响不大。悬臂的刚度随载荷或挠度的增加而增加，而不是保持不变。在临床加载范围内，我们确定了钛钼合金刚度超过不锈钢刚度的反向加载值。只有当垂直挠度保持在悬臂长度的 16% 以内时，教科书上的悬臂指南才能适用：在典型的临床载荷范围内，悬臂的载荷-挠度关系偏离了胡克定律，因为挠度特征非常明显。当垂直挠度不超过悬臂长度的 16% 时，传统模型仍然有效。否则，建议根据实际测量结果确定荷载和刚度，而不是依赖理论预测。

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引用次数: 0

Orthodontic pain with fixed appliances and clear aligners: A 6-month comparison 固定矫治器和透明矫治器的正畸疼痛：为期 6 个月的比较

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-01 DOI: 10.1016/j.ajodo.2024.07.002

Victor Chan , Bhavna Shroff , Neal D. Kravitz , Caroline Carrico , Daniel Hawkins , Phuong Tran , Steven Lindauer

Introduction

This prospective study compared pain perception, intensity, and analgesic use among patients treated with fixed appliances (FAs) and clear aligners (CAs) over 6 months.

Methods

Digital surveys were collected from 87 adult patients treated with CA or FA from 2 orthodontic offices. The 7-item survey was sent at 3-time points (preappointment, 2-day postappointment, and 7-day postappointment) for each appointment. Wilcoxon, t test, and Fisher exact chi-square tests were performed with significance set at 0.05.

Results

The FA group had a higher rate and intensity of pain 2 days after the second, third, and fifth appointments (P <0.030). At 7 days postappointment, the FA group had a higher rate and intensity of pain for the first and fifth appointments. Dull pain was reported the most in both groups, with a proportion of FA patients reporting throbbing (31%) or sharp (20%) pain (P = 0.035) at 2 days postappointment. The CA group reported the most pain at rest, whereas the FA group reported chewing as the most painful (P = 0.002). The FA group had a higher rate of analgesic consumption after the first appointment (P = 0.037).

Conclusions

Both the FA and CA groups experienced similar rates and intensities of pain 2 days after the delivery of appliances at the first appointment. Although CA pain intensity remained minimal, FA pain peaked 2 days postappointment whenever a new orthodontic stimulus was introduced and remained elevated 7 days postappointment when that stimulus was a new archwire material.

简介：这是一项前瞻性研究：这项前瞻性研究比较了接受固定矫治器（FA）和透明矫治器（CA）治疗的患者在6个月内的疼痛感、疼痛强度和止痛药使用情况：从 2 个正畸诊所收集了 87 名接受过 CA 或 FA 治疗的成年患者的数字调查。在每次就诊的 3 个时间点（就诊前、就诊后 2 天和就诊后 7 天）发送 7 个项目的调查问卷。进行了 Wilcoxon 检验、t 检验和费舍尔精确卡方检验，显著性设定为 0.05：在第二次、第三次和第五次预约后 2 天，FA 组的疼痛发生率和疼痛强度更高（P 结论：FA 组和 CA 组的疼痛发生率和疼痛强度相似：FA组和CA组在首次就诊提供矫治器两天后的疼痛率和疼痛强度相似。虽然 CA 疼痛强度仍然很小，但每当引入新的正畸刺激时，FA 疼痛在预约后 2 天达到峰值，而当刺激是新的弓丝材料时，FA 疼痛在预约后 7 天仍然较高。

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引用次数: 0

Donald “Skip” Ferguson (1945-2024): A Legacy of Kindness, Mentorship, and Adventure! 唐纳德-弗格森（Donald "Skip" Ferguson，1945-2024 年）：仁慈、导师和冒险的遗产！

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-11-01 DOI: 10.1016/j.ajodo.2024.08.003

Nikhillesh Vaiid, Dauro Olivera, Pramod Sinha

引用次数: 0

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