American Journal of Orthodontics and Dentofacial Orthopedics最新文献_第9页

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IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-11-01 DOI: 10.1016/S0889-5406(25)00414-7

引用次数: 0

Mitigation of aerosol particles during composite attachment removal 复合材料附着物去除过程中气溶胶颗粒的减缓。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-11-01 DOI: 10.1016/j.ajodo.2025.05.007

Erin Yoshida , Sepehr Makhsous , Lloyd Mancl , Bobby Cohanim , Igor Novosselov , Geoffrey Greenlee , Greg Huang

Introduction

This study aimed to determine which strategies most effectively reduce aerosolized particles when removing orthodontic composite attachments.

Methods

A network of AeroSpec portable particle monitors was employed to record particulate data in real-time. Sixteen sensors were placed in a 3-dimensional grid system around an operatory at the University of Washington Orthodontics Department. Composite attachments (Transbond LR; 3M, St Paul, Minn) were removed from the anterior 6 teeth of maxillary and mandibular resin models. Particulate matter of optical diameter ≤2.5 μm (PM_2.5) was measured. Three different high-speed handpieces were tested: conventional air-driven (StarDental; DentalEZ, Malvern, Pa), electric (BienAir, Bienne, Switzerland), and air-free (Medidenta, Las Vegas, Nev). Four different suction conditions were tested with each handpiece: none, high-speed intraoral suction (IOS), extraoral suction (EOS), and both together. Four repetitions with each variant were performed. Linear regression was used to compare average and maximum particle concentration by suction and handpiece.

Results

The highest concentration of particles was observed around the operator and decreased farther from the source of composite removal. Linear regression for the main effect of handpiece type indicated lower PM_2.5 when electric or air-free handpieces were used compared with the conventional handpieces. Linear regression for the main effect of suction showed significant reductions when any suction was used compared with none. The simultaneous use of both IOS and EOS resulted in the greatest reduction in PM_2.5.

Conclusions

Using an air-free or electric handpiece, along with simultaneous use of IOS and EOS, reduced the mean particle concentrations by 87% and 86% and the maximum particle concentrations by 92% and 94% near the operator, compared with a conventional handpiece and no suction.

简介：本研究旨在确定哪种策略在去除正畸复合附着体时最有效地减少雾化颗粒。方法：采用AeroSpec便携式颗粒监测仪网络实时记录颗粒数据。16个传感器被放置在华盛顿大学正畸科手术室周围的一个三维网格系统中。复合附件(Transbond LR；3M, St Paul, minnesota)从上颌和下颌树脂模型的前6颗牙中取出。测量光学直径≤2.5 μm的颗粒物（PM2.5）。测试了三种不同的高速手机：传统的空气驱动(StarDental；DentalEZ, Malvern, Pa), electric (BienAir, Bienne, Switzerland), air-free （meddenta, Las Vegas, nevada）。每个手机分别测试了四种不同的吸痰条件：无吸痰、高速口内吸痰（IOS）、口外吸痰（EOS）和同时吸痰。每种变异重复4次。采用线性回归法比较吸力法和手持法的平均浓度和最大浓度。结果：操作人员周围颗粒浓度最高，离复合去除源越远颗粒浓度越低。对手机类型主效应的线性回归表明，与传统手机相比，使用电动手机或无空气手机时PM2.5较低。对吸力的主要影响的线性回归显示，与不使用吸力相比，使用任何吸力时显著降低。同时使用IOS和EOS， PM2.5下降幅度最大。结论：与常规机头和无吸力相比，使用无空气机头或电动机头，同时使用IOS和EOS，可使操作者附近的平均颗粒浓度降低87%和86%，最大颗粒浓度降低92%和94%。

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引用次数: 0

Effects of maxillary protraction with an orthopedic facemask on fricatives 矫形面罩颌前伸对磨擦的影响。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-11-01 DOI: 10.1016/j.ajodo.2025.07.011

Gokhan Coban , Nisa Gul Amuk , Beyza Nur Dukar , Hatice Feyza Konca , Nizami Hashimli , Taner Ozturk

Introduction

This prospective cohort study aimed to investigate the effect of rapid maxillary expansion (RME) and orthopedic facemask (FM) treatment on the acoustic properties of fricative sounds (/s/ and /ʃ/) through objective and subjective (perceptual) assessments.

Methods

Twenty-two patients (7 females and 15 males; mean age: 11.27 ± 1.38 years) underwent speech recordings at 4 time points: immediately before RME (T0), 2 weeks later (immediately before FM application, T1), 3 months later (T2), and 1 week after treatment (T3). Speech therapists recorded the data and conducted acoustic analyses using Praat software. Acoustic parameters—duration, spectral peak, center of gravity, and second formant transition—were analyzed for /s/ and /ʃ/ in monosyllabic words with /a/, /u/, and /ı/ vowels in both word-initial and word-final positions. Data were statistically analyzed using repeated measures analysis of variance and the Friedman test. Cephalometric radiographs were taken at T0 and T3.

Results

After RME and FM therapy, duration decreased significantly in the word-initial positions of /s/ and /ʃ/ (P = 0.002). Spectral peaks decreased significantly in the word-initial and word-final positions during treatment for both /s/ (P <0.001) and /ʃ/ (P = 0.007), returning to baseline by T3. However, a significant overall decrease persisted (P <0.001). Center of gravity also decreased significantly during treatment (P <0.05), whereas second formant transition values did not change. A perceptual evaluation revealed high articulation accuracy (2.00) at T0 for all evaluations, a significant decrease at T2 with increased scores (3.65 for /s/ and /ʃ/ total, 4.00 for overall intelligibility, P <0.001), and a subsequent improvement at T3 (1.33 for all evaluations, P <0.001), with scores significantly lower than at T0 (P <0.001).

Conclusions

RME and FM therapy led to favorable structural and phonetic changes. Improvements in acoustic properties and perceptual scores suggest effective adaptation and enhanced articulation after treatment.

本前瞻性队列研究旨在通过客观和主观（知觉）评估探讨快速上颌扩张（RME）和矫形面罩（FM）治疗对摩擦音（/s/和/ h /）声学特性的影响。方法：22例患者（女性7例，男性15例，平均年龄11.27±1.38岁）分别在RME前（T0）、2周后（FM应用前，T1）、3个月后（T2）、治疗后1周（T3） 4个时间点进行语音录音。语言治疗师记录数据并使用Praat软件进行声学分析。声学参数——持续时间、谱峰、重心和第二形成峰过渡——分析了在单词起始和词尾位置都有/a/、/u/和/ yi /元音的单音节单词中的/s/和/ h /。采用重复测量方差分析和Friedman检验对数据进行统计分析。在T0和T3时拍摄头颅x线片。结果：RME和FM治疗后，/s/和/ h /的单词起始位置持续时间显著缩短（P = 0.002）。结论：RME和FM治疗可使语音结构和语音发生良好的变化。声学特性和感知评分的改善表明治疗后有效的适应和增强的发音。

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引用次数: 0

Is the cervical vertebral maturation method a reliable predictor of midpalatal suture maturation? A retrospective study 颈椎成熟度法是中腭缝合成熟度的可靠预测指标吗？回顾性研究。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-11-01 DOI: 10.1016/j.ajodo.2025.07.009

Davide Brilli , Federica Altieri , Martina Mezio , Michele Cassetta

Introduction

The study aimed to assess the correlations among chronological age, cervical vertebral maturation (CVM), midpalatal suture (MPS) maturation, and MPS density (MPSD), and to evaluate the association between the CVM and MPS.

Methods

Records derived from the analysis of lateral cephalometric radiographs and cone-beam computed tomography scans of 200 subjects, grouped by sex, were used to determine CVM, MPS, and MPSD ratio. Statistical analysis included descriptive statistics. Spearman correlation and positive likelihood ratio were used to determine the possible correlations.

Results

In males, strong correlations were observed between CVM stage (CS) and age (r = 0.864), CVM and MPS stage (r = 0.826). Moderate correlation was found between CS and MPSD ratio (r = 0.488). Strong correlations were found between MPS stages and age (r = 0.729) and MPSD ratio (r = 0.622). Among females, strong correlations appeared between CVM and age (r = 0.872), between CS and MPS stage (r = 0.899), and between CVM and MPSD ratio (r = 0.618). Further strong correlations were found between MPS stages and age (r = 0.8), and between MPS stages and MPSD (r = 0.716). In both sexes, the positive likelihood ratio test demonstrated strong associations between CS1 and stage A, CS5 and stage D, and CS6 and stage E.

Conclusions

Significant correlations exist between chronological age, CVM, MPS, and MPSD. The CVM method demonstrated a high predictive value in identifying stages A, D, and E. The CVM method could be considered as a decision-making indicator in crossbite treatment; however, it should be confirmed by further prospective studies.

前言：本研究旨在评估实足年龄、颈椎成熟度（CVM）、中腭缝合（MPS）成熟度和MPS密度（MPSD）之间的相关性，并评估CVM与MPS之间的关系。方法：分析200名受试者的侧位头颅x线片和锥束计算机断层扫描记录，按性别分组，确定CVM， MPS和MPSD比率。统计分析包括描述性统计。采用Spearman相关和正似然比确定可能的相关性。结果：男性CVM分期与年龄（r = 0.864）、CVM分期与MPS分期（r = 0.826）有较强相关性。CS与MPSD比值呈正相关（r = 0.488）。MPS分期与年龄（r = 0.729）及MPSD比值（r = 0.622）有较强的相关性。在女性中，CVM与年龄（r = 0.872）、CS与MPS分期（r = 0.899）、CVM与MPSD比值（r = 0.618）有较强的相关性。进一步发现MPS分期与年龄（r = 0.8）、MPS分期与MPSD （r = 0.716）之间存在强相关性。在两性中，正似然比检验显示CS1与A期、CS5与D期、CS6与e期之间存在较强的相关性。结论：实足年龄、CVM、MPS和MPSD之间存在显著相关性。CVM方法对a、D、e期有较高的预测价值，可作为牙合治疗的决策指标；然而，这需要进一步的前瞻性研究来证实。

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引用次数: 0

Clear aligner orthodontic treatment: An international modified Delphi consensus study 透明矫正器正畸治疗：一项国际修正德尔菲共识研究。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-11-01 DOI: 10.1016/j.ajodo.2025.07.012

Niki Arveda , Marta Calza , Tommaso Castroflorio , Francesco Garino , Aldo Giancotti , Juan Carlos Varela , Calogero Dolce , Bjorn Ludwig , Paolo Manzo , Ravindra Nanda , Oliverio Teresa , Angela Arreghini , Francesca Cremonini , Davide Mirabella , Filippo Pepe , Chris Laspos , Robert L. Boyd , Gina Theodoridis , Carlos Flores Mir , Teresa Pinho , Giuseppe Siciliani

Introduction

This study aimed to establish a consensus, thanks to the participation of a large group of experts in the field of aligner therapy, on several of its clinical and extraclinical aspects, with particular reference to its potential and biomechanical limitations.

Methods

A Delphi study was conducted in 3 rounds. On the basis of the most recent systematic reviews in the literature, the steering committee formulated 35 questions. A group of 36 international experts agreed to participate in the survey and were asked to respond to the questions, choosing their level of agreement on a scale of 1-5 in the first round, then from 1 to 3 in the second, and finally with a yes or no response in the third, progressively narrowing the field of research. The items for which consensus (≥70%) was obtained were accepted; the others were reformulated.

Results

On the basis of the analysis of the experts’ responses, 68 questions were reformulated for the second round and 28 for the third round. After 3 rounds, the study generated 47 consensus statements regarding biomechanical aspects and extraclinical factors.

Conclusions

The study, based on the modified Delphi method, collected the opinion of experts, comparing it with the scientific literature to evaluate the potential and limitations of orthodontic aligners, obtaining 47 consensus statements related to biomechanics and extraclinical factors.

导言：这项研究的目的是建立一个共识，感谢一大批专家在对准器治疗领域的参与，在其临床和临床外的几个方面，特别是参考其潜力和生物力学的局限性。方法：采用德尔菲法进行3轮调查。在文献中最新系统综述的基础上，指导委员会制定了35个问题。一组36名国际专家同意参与调查，并被要求回答问题，在第一轮中选择他们的同意程度为1-5分，然后在第二轮中从1到3分，最后在第三轮中选择“是”或“否”，逐步缩小研究领域。获得一致意见（≥70%）的项目被接受；其他的都被重新制定了。结果：在对专家回答进行分析的基础上，第二轮重新制定了68个问题，第三轮重新制定了28个问题。经过三轮研究，产生了47项关于生物力学方面和临床外因素的共识声明。结论：本研究基于改进的德尔菲法，收集专家意见，并与科学文献进行比较，评价正畸矫正器的潜力和局限性，获得47条与生物力学和临床外因素相关的共识陈述。

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引用次数: 0

Impacted second premolars in cleidocranial dysplasia: Three-dimensional position and morphology characteristics and factors affecting the success rate of closed eruption 锁骨颅发育不良患者阻生第二前磨牙的三维位置、形态特征及影响闭合性萌出成功率的因素。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-10-28 DOI: 10.1016/j.ajodo.2025.09.016

Jia-Lin Chen , Lin-Nan Yu , Qiu-Chi Ran , Qiu-Yi Wu , Yu-Yao Cai , Chen Li , Jing-Jia Yu , Xi-Meng Chen , Nan Wang , Zhen-Jin Zhao

Introduction

Orthodontic-aided closed eruption of impacted second premolars often fails in patients with cleidocranial dysplasia (CCD). This study aims to evaluate the 3-dimensional position and root morphology of impacted second premolars and identify factors affecting the success of orthodontic-guided closed eruption in CCD patients.

Methods

Cone-beam computed tomography images from CCD patients with impacted second premolars were selected and evaluated. The original cone-beam computed tomography data were reconstructed using Dolphin Imaging software (Dolphin Imaging and Management Solutions, Chatsworth, Calif), and the 3-dimensional position, root morphology of impacted second premolars, along with factors associated with closed-eruption success, were analyzed.

Results

Eleven patients (37 impacted second premolars) with CCD, comprising 7 males and 4 females, were included. The average duration of the closed-eruption treatment was 29.00 ± 6.84 months, yielding a success rate of 89.29%. In the 37 impacted second premolars, vertical impaction was the most common (23 [62.16%]), followed by palatal (10 [27.03%]) and buccal (4 [10.81%]). Moreover, 9 of the 37 impacted second premolars failed to erupt, of which 6 were in the low palatal position with a completed root apex. Chi-square tests revealed that the impacted second premolars in the coronal and axial positions, and Nolla’s stages were significantly associated with closed-eruption failure (P <0.05).

Conclusions

Most impacted second premolars with failed eruption were at the mandibular palatal side and in Nolla’s stages 9 and 10. Closed-eruption treatment in patients with CCD is primarily influenced by coronal and axial positions and Nolla’s stage.

正畸辅助阻生第二前磨牙闭合性出牙治疗锁骨颅发育不良（CCD）患者常以失败告终。本研究旨在评估患侧第二前磨牙的三维位置和牙根形态，探讨影响CCD患者正畸引导闭式萌牙成功的因素。方法：选择CCD患者第二前磨牙阻生的锥束ct图像并进行评价。使用Dolphin Imaging软件（Dolphin Imaging and Management Solutions, Chatsworth, california）重建原始的锥形束计算机断层扫描数据，并分析受阻第二前磨牙的三维位置、牙根形态以及与闭合出牙成功相关的因素。结果：11例患CCD的患者（37例），男7例，女4例。闭锁治疗的平均时间为29.00±6.84个月，成功率为89.29%。37例阻生第二前磨牙中，以垂直嵌塞最多（23例[62.16%]），其次是腭嵌塞（10例[27.03%]）和颊嵌塞（4例[10.81%]）。37例阻生第二前磨牙中有9例未出牙，其中6例位于腭下位，根尖完整。卡方检验显示，冠状位和轴状位阻生的第二前磨牙以及Nolla的阶段与闭合出牙失败显著相关(P结论：大多数阻生的第二前磨牙在下颌腭侧和Nolla的第9期和第10期。CCD患者的闭式爆发治疗主要受冠状位、轴状位和Nolla分期的影响。

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引用次数: 0

Accuracy of a new, slim, and rigid CAD-CAM transfer tray: An in vivo study 一种新的，纤细的，刚性CAD-CAM转移托盘的准确性：一项体内研究。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-10-25 DOI: 10.1016/j.ajodo.2025.08.016

Mario Palone , Petra J. Koch , Julia De Geer , Gianmarco Guidetti , Francesca Cremonini , Giorgio A. Spedicato , Luca Brucculeri , Alessandro Verducci , Luca Lombardo

Introduction

The objective of this study was to evaluate the in vivo transfer accuracy of a new slim and rigid computer-aided design and manufacturing (CAD-CAM) transfer tray.

Methods

Seventeen patients (9 males and 8 females; average age, 14.3 years) with permanent dentition undergoing orthodontic treatment were enrolled. Digital models were obtained, and brackets and molar tubes were virtually positioned. The CAD-CAM transfer tray was designed and 3-dimensionally printed, and the bonding procedure was performed. Transfer accuracy was assessed by measuring linear and angular deviations between planned and in vivo bonded bracket positions by superimposition using a local best-fit alignment performed by a semiautomatic algorithm in the analysis software Geomagic Control (3D System Inc, Rock Hill, NC).

Results

A total of 408 teeth (208 maxillary and 200 mandibular) were superimposed. All mean linear deviations were <0.5 mm, although some exceeded the 0.25-mm cutoff (4.4% of mesiodistal measurements, 4.2% of vertical, and 0.2% of buccolingual). Angular discrepancies were greater, especially when using a 1° cutoff (25.7% for torque, 33.8% for rotation, and 18.6% for tip). However, these discrepancies decreased significantly when the cutoff was raised to 2° (in 5.6%, 9.3% and 3.4% respectively). Considering all brackets, no directional bias was detected, except in buccolingual measurements (35% vestibular and 65% lingual). Transfer accuracy was influenced by the variables tooth type, tooth position, and arch, which had various impacts across specific measurements.

Conclusions

The new CAD-CAM transfer tray demonstrated good overall transfer accuracy and some clinical advantages, although refinement of the design is required to enhance its performance.

简介：本研究的目的是评估一种新型细长刚性计算机辅助设计和制造（CAD-CAM）转移托盘的体内转移精度。方法：选取17例接受正畸治疗的恒牙列患者，男9例，女8例，平均年龄14.3岁。获得数字模型，并对托槽和磨牙管进行虚拟定位。设计并三维打印了CAD-CAM传递托盘，并进行了粘接。通过在分析软件Geomagic Control （3D System Inc ., Rock Hill， NC）中使用半自动算法进行局部最佳拟合校准，通过测量计划和体内粘合支架位置之间的线性和角度偏差来评估传递精度。结果：共种植牙408颗（上颌208颗，下颌骨200颗）。结论：新的CAD-CAM转移托盘显示出良好的整体转移精度和一些临床优势，尽管需要改进设计以提高其性能。

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引用次数: 0

Factors influencing pterygomaxillary suture split after miniscrew-assisted rapid palatal expansion in late adolescents and young adults: A cone-beam computed tomography study 影响晚期青少年和年轻人在微型辅助快速腭扩张后翼颌缝裂开的因素：一项锥束计算机断层研究。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-10-18 DOI: 10.1016/j.ajodo.2025.09.013

Niansu Ruan , Fang Hua , Hui Xiong , Hong He

Introduction

This study aimed to investigate the factors influencing the pterygomaxillary suture split (PMSS) after miniscrew-assisted rapid palatal expansion (MARPE) in late adolescents and young adults using cone-beam computed tomography.

Methods

Preexpansion (T0) and postexpansion (T1) cone-beam computed tomography images of 82 MARPE patients (mean age, 20.7 ± 3.7 years; range, 15.2-32.4 years) were analyzed. Vertical (SN-GoGn angle) and horizontal (ANB angle) skeletal relationships were assessed at T0. Associations between PMSS incidence and variables including age, sex, midpalatal suture maturation (MPSM) stage, palate length (PL), expansion magnitude, and midpalatal suture opening pattern were evaluated. Statistical analyses included Spearman’s correlation test and the Wilcoxon signed rank test.

Results

PMSS was observed in half of the subjects after MARPE. Inferior PMSS demonstrated a moderate positive correlation with posterior palatal expansion (ρ = 0.561, P <0.001). Conversely, inferior PMSS showed significant negative correlations with MPSM stage (ρ = −0.555, P <0.001), age (ρ = −0.286, P <0.05), and the ANB angle (ρ = −0.316, P <0.05). No significant correlations were observed between PMSS and the posterior palatal expansion to anterior palatal expansion ratio, sex, PL, or SN-GoGn angle. The magnitude of inferior PMSS was significantly greater than that of superior PMSS (P <0.001), whereas left and right PMSS magnitudes were symmetrical (P >0.05).

Conclusions

Among late adolescents and young adults treated with MARPE, posttreatment PMSS magnitude showed a moderate positive correlation with posterior palatal expansion magnitude, a moderate negative correlation with MPSM stage, and weak negative correlations with both age and ANB angle. The bilateral PMSS magnitudes were symmetrical, with significantly greater magnitudes inferiorly than superiorly. Sex, PL, vertical skeletal pattern, and midpalatal suture opening pattern were not significantly associated with PMSS magnitude.

摘要：本研究旨在探讨影响晚期青少年和青壮年在微型辅助快速腭扩张术（MARPE）后翼颌缝裂（PMSS）的因素。方法：分析82例MARPE患者（平均年龄20.7±3.7岁，范围15.2 ~ 32.4岁）扩张前（T0）和扩张后（T1）锥束ct图像。在T0时评估垂直（sn - gonn角）和水平（ANB角）骨骼关系。评估PMSS发病率与年龄、性别、中腭缝合成熟（MPSM）阶段、腭长（PL）、扩张幅度和中腭缝合打开模式等变量的关系。统计分析采用Spearman相关检验和Wilcoxon符号秩检验。结果：半数受试者在MARPE后出现经前综合征。下位PMSS与后腭扩张呈中度正相关（ρ = 0.561, p0.05）。结论：在接受MARPE治疗的青少年晚期和青壮年患者中，治疗后PMSS大小与后腭扩张大小呈中度正相关，与MPSM分期呈中度负相关，与年龄和ANB角度呈弱负相关。双侧PMSS大小对称，下位明显大于上位。性别、PL、垂直骨骼模式和中腭缝线打开模式与PMSS程度无显著相关。

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引用次数: 0

CBCT analysis of maxillary buccal bone thickness and height after conventional orthodontic treatment with standardized archwires: A retrospective study 常规规范化弓线正畸治疗后上颌颊骨厚度和高度的CBCT分析：回顾性研究。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-10-18 DOI: 10.1016/j.ajodo.2025.08.011

Nour Hobani , Mohammad Qali , Mohammed Alshanbari , Chenshuang Li , Nipul Tanna , Rodrigo Neiva , Jonathan Korostoff , Normand Boucher

Introduction

Modification of the dental arch form with buccal expansion to improve tooth alignment and to fill buccal corridors is common with orthodontic treatment. The purpose of this study is to assess the consequence of using broad preformed archwires for maxillary posterior arch development on the surrounding periodontium during routine orthodontic treatment.

Methods

A retrospective cone-beam computed tomography study was conducted of 44 consecutively treated adult orthodontic patients with bonded edgewise orthodontic appliances, resulting in a wider arch form. The measurements of interest were made on cone-beam computed tomography radiographs at pretreatment and posttreatment for the maxillary first premolars, second premolars, and mesiobuccal and distobuccal roots of first molars. The parameters were: (1) buccal alveolar bone height, (2) buccal alveolar bone thickness, (3) transverse width, (4) root inclination, and (5) the presence or absence of dehiscences and fenestrations.

Results

The percentage of fenestrations and dehiscences in the maxilla at pretreatment was 50.8%, and it increased by 11.3% at posttreatment. The transverse width change was statistically significant posttreatment. When the maxillary posterior dental arch forms were expanded, the following tendencies were observed: (1) an increase in buccal alveolar bone height (bone loss), and (2) a reduction of buccal alveolar bone thickness.

Conclusions

The routine practice of orthodontic arch expansion with preformed archwires results in adverse alterations in the dimensions of the buccal alveolar bone.

简介：在正畸治疗中，改良牙弓的形式，以改善牙齿的排列和填充颊道是很常见的。本研究的目的是评估在常规正畸治疗中使用广泛的预成形弓线对周围牙周组织的上颌后弓发育的影响。方法：对44例连续治疗的成人正畸患者进行回顾性锥形束计算机断层扫描研究，使用粘结式边缘正畸矫治器，使正畸弓形变宽。在上颌第一前磨牙、第二前磨牙和第一磨牙的中颊根和分布颊根的治疗前和治疗后的锥束计算机断层x线摄影上进行了感兴趣的测量。参数为：(1)颊牙槽骨高度，(2)颊牙槽骨厚度，(3)横向宽度，(4)牙根倾角，(5)有无裂孔和裂孔。结果：治疗前上颌开孔开裂率为50.8%，治疗后上颌开孔开裂率提高11.3%。治疗后横向宽度变化有统计学意义。当上颌后牙弓形态扩大时，观察到以下趋势：(1)颊牙槽骨高度增加（骨质流失）；(2)颊牙槽骨厚度减少。结论：常规使用预制弓线进行正畸弓扩张会对牙槽骨的尺寸产生不利的影响。

{"title":"CBCT analysis of maxillary buccal bone thickness and height after conventional orthodontic treatment with standardized archwires: A retrospective study","authors":"Nour Hobani , Mohammad Qali , Mohammed Alshanbari , Chenshuang Li , Nipul Tanna , Rodrigo Neiva , Jonathan Korostoff , Normand Boucher","doi":"10.1016/j.ajodo.2025.08.011","DOIUrl":"10.1016/j.ajodo.2025.08.011","url":null,"abstract":"<div><h3>Introduction</h3><div>Modification of the dental arch form with buccal expansion to improve tooth alignment and to fill buccal corridors is common with orthodontic treatment. The purpose of this study is to assess the consequence of using broad preformed archwires for maxillary posterior arch development on the surrounding periodontium during routine orthodontic treatment.</div></div><div><h3>Methods</h3><div>A retrospective cone-beam computed tomography study was conducted of 44 consecutively treated adult orthodontic patients with bonded edgewise orthodontic appliances, resulting in a wider arch form. The measurements of interest were made on cone-beam computed tomography radiographs at pretreatment and posttreatment for the maxillary first premolars, second premolars, and mesiobuccal and distobuccal roots of first molars. The parameters were: (1) buccal alveolar bone height, (2) buccal alveolar bone thickness, (3) transverse width, (4) root inclination, and (5) the presence or absence of dehiscences and fenestrations.</div></div><div><h3>Results</h3><div>The percentage of fenestrations and dehiscences in the maxilla at pretreatment was 50.8%, and it increased by 11.3% at posttreatment. The transverse width change was statistically significant posttreatment. When the maxillary posterior dental arch forms were expanded, the following tendencies were observed: (1) an increase in buccal alveolar bone height (bone loss), and (2) a reduction of buccal alveolar bone thickness.</div></div><div><h3>Conclusions</h3><div>The routine practice of orthodontic arch expansion with preformed archwires results in adverse alterations in the dimensions of the buccal alveolar bone.</div></div>","PeriodicalId":50806,"journal":{"name":"American Journal of Orthodontics and Dentofacial Orthopedics","volume":"168 6","pages":"Pages 764-772.e4"},"PeriodicalIF":3.0,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Planned and achieved orthodontic tooth movement and labiolingual inclination changes of mandibular incisors during nonextraction space closure with clear aligners: A retrospective cohort study 计划和实现正畸牙齿运动和唇舌倾斜度的变化在下颌门牙非拔牙间隙封闭：一项回顾性队列研究。

IF 3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2025-10-17 DOI: 10.1016/j.ajodo.2025.09.012

Darshan N. Desai, Tony Weir, Maurice J. Meade

Introduction

The study aimed to determine the center of rotation and the type of orthodontic tooth movement (OTM) of the mandibular central incisors (Cis) and lateral incisors (Lis), and the efficacy of achieving planned labiolingual incisor inclination changes after nonextraction space closure (NESC) with the Invisalign (Align Technology, Santa Clara, Calif) appliance.

Methods

Digital study models of initial, planned, and achieved treatment outcomes were obtained from the Invisalign treatment planning facility, ClinCheck. Vectors analogous to the long axes of the incisors were generated using Geomagic Control X (version 2022.0: 3D Systems, Cary, NC) metrology software. Intersecting vectors represented the incisors’ center of rotation, whereas measurement of the vectors to a reference y-plane enabled determination of incisor labiolingual inclination.

Results

A total of 166 mandibular incisors from 42 patients satisfied the inclusion criteria. The achieved mean (standard deviation) OTMs were 41.4% (23.6) of those planned. Translation was the least successful OTM, with 7.6% of Cis and 8.3% of Lis translating as planned. Planned retroclination resulted in overexpression of 151% for CIs and 165% for Lis. The accuracy of planned proclination was low, with only 16.7% of CIs and 25.8% of Lis proclining as planned, whereas the remainder retroclined instead.

Conclusions

Less than half of the planned OTM for the mandibular incisors during NESC was achieved. Planned retroclination was overexpressed, and most of planned proclination resulted in retroclination. Clinicians should consider these findings when planning NESC treatment with the Invisalign appliance.

简介：本研究旨在确定下颌中切牙（Cis）和侧切牙（Lis）的旋转中心和正畸牙齿运动类型（OTM），以及使用Invisalign （Align Technology, Santa Clara, Calif .）矫治器在非拔牙间隙关闭（NESC）后实现计划唇舌切牙倾斜改变的效果。方法：从Invisalign治疗计划设施ClinCheck获得初始、计划和实现治疗结果的数字研究模型。使用Geomagic Control X（版本2022.0:3D Systems, Cary， NC）计量软件生成类似于门牙长轴的矢量。交叉向量代表切牙的旋转中心，而测量向量到参考y平面可以确定切牙的唇舌倾斜度。结果：42例患者166个下颌骨切牙符合纳入标准。达到的平均（标准偏差）OTMs为计划的41.4%（23.6）。翻译是最不成功的OTM， 7.6%的ci和8.3%的li按计划翻译。计划逆行导致CIs过表达151%，Lis过表达165%。计划腹倾的准确性较低，只有16.7%的CIs和25.8%的Lis按计划腹倾，而其余的则是逆行。结论：在NESC中，只有不到一半的下颌切牙达到了计划的OTM。计划性后倾过表达，计划性后倾多数导致后倾。临床医生在计划使用Invisalign器械治疗NESC时应考虑这些结果。

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