American Journal of Orthodontics and Dentofacial Orthopedics最新文献

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/S0889-5406(24)00209-9

引用次数: 0

Three-dimensional assessment of virtual clear aligner attachment removal: A prospective clinical study 虚拟透明矫治器附件去除的三维评估：前瞻性临床研究。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.02.006

Jeremy Dock , Flavio Copello , Iman Shirmohammadi , Jose A. Bosio

Introduction

In digital dentistry, virtual attachment removal (VAR) optimizes clear aligner therapy by enhancing efficiency for refinements and enabling prefabricated retainer production through the removal of attachments from a digital scan before the clinical removal of clear aligner attachments. This prospective clinical study aimed to evaluate the accuracy of VAR in the maxillary arch.

Methods

A total of 110 teeth were analyzed from a sample of 54 maxillary scans from 25 subjects. Models with attachments were virtually debonded using Meshmixer (Autodesk, San Rafael, Calif) and superimposed over the control group in MeshLab. Vector Analysis Module (Canfield Scientific, Fairfield, NJ) was used to calculate and analyze 3-dimensional Euclidean distances on the buccal surfaces between the superimposed models. Statistical analysis was performed using SPSS (version 23.0, IBM, Armonk, NY). The Shapiro-Wilkes (α = 0.05) test determined a nonnormal distribution of results. The Kruskal-Wallis (α = 0.05) was used to determine differences between different tooth types and the number of attachments.

Results

The VAR protocol showed no statistical differences in the root mean square between different tooth segments with an overall tendency for inadequate attachment removal. No difference between the groups was found regarding the number of attachments when used as a main factor.

Conclusions

The VAR technique is precise enough for the fabrication of retainers from printed dental models in a clinical setting and is not affected by the number of attachments on the tooth.

导言：在数字牙科中，虚拟附着体去除（VAR）通过在临床去除透明矫治器附着体之前从数字扫描中去除附着体来提高矫治效率并实现预制保持器的制作，从而优化透明矫治器治疗。这项前瞻性临床研究旨在评估VAR在上颌牙弓中的准确性。方法从25名受试者的54个上颌扫描样本中分析了110颗牙齿。使用 Meshmixer (Autodesk, San Rafael, Calif) 对带有附着体的模型进行虚拟剥离，并在 MeshLab 中与对照组叠加。矢量分析模块（Canfield Scientific, Fairfield, NJ）用于计算和分析叠加模型之间颊面的三维欧氏距离。统计分析使用 SPSS（23.0 版，IBM，Armonk，NY）进行。Shapiro-Wilkes (α = 0.05) 检验确定结果呈非正态分布。Kruskal-Wallis（α = 0.05）用于确定不同牙齿类型和附着体数量之间的差异。结果VAR方案显示，不同牙段的均方根没有统计学差异，总体倾向于附着体去除不足。结论VAR技术足够精确，可以在临床环境中根据打印的牙科模型制作保持器，并且不受牙齿上附着物数量的影响。

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引用次数: 0

July 2024 2024 年 7 月

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.05.003

Dr Allen H. Moffitt (CE Editor)

引用次数: 0

Comparing the accuracy of 3 different liquid crystal display printers for dental model printing 比较用于牙科模型打印的 3 种不同液晶显示器打印机的精度。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.01.017

Ioannis A. Tsolakis , Ioannis Lyros , Isidora Christopoulou , Apostolos I. Tsolakis , Moschos A. Papadopoulos

Introduction

This study aimed to evaluate the accuracy in terms of trueness and precision of 3 different liquid crystal display (LCD) printers with different cost levels.

Methods

Three LCD 3-dimensional (3D) printers were categorized into tiers 1-3 on the basis of cost level. The printers’ accuracies were assessed in terms of trueness and precision. For this research, 10 standard tessellation language (STL) reference files were used. For trueness, each STL file was printed once with each 3D printer. For precision, 1 randomly chosen STL file was printed 10 times with each 3D printer. After that, a model scanner was used to scan the models, and STL comparisons were performed using reverse engineering software. For the measurements regarding trueness and precision, the Friedman test was used.

Results

There were significant differences among the 3 printers (P <0.05). The trueness and precision error were lower in models printed with a tier-1 printer than in the remaining 3D printers (P <0.05). The tier-2 and -3 printers presented very similar performance.

Conclusions

LCD 3D printers can be accurately used in orthodontics for model printing depending on the specific orthodontic use. The cost of a printer is relevant to the results only for the higher expense of the 3D printer in this study.

方法根据成本水平将三台液晶三维（3D）打印机分为 1-3 级。根据真实度和精确度对打印机的精确度进行了评估。本研究使用了 10 个标准细分语言（STL）参考文件。在真实度方面，每个 STL 文件用每台 3D 打印机打印一次。在精度方面，每个三维打印机随机选择一个 STL 文件打印 10 次。之后，使用模型扫描仪对模型进行扫描，并使用逆向工程软件对 STL 文件进行比较。对于真实度和精度的测量，使用了弗里德曼检验。结果 3 台打印机之间存在显著差异（P <0.05）。使用 1 级打印机打印的模型的真实度和精度误差低于其他 3D 打印机（P <0.05）。结论根据具体的正畸用途，LCD 三维打印机可以准确地用于正畸模型打印。在本研究中，打印机的成本仅与三维打印机的较高成本有关。

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引用次数: 0

The uses of 3-dimensional printing technology in orthodontic offices in North America 三维打印技术在北美正畸诊所中的应用。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.03.014

Tarek ElShebiny , Yahaziel Simon , Catherine A. Demko , Juan Martin Palomo

Introduction

The purpose of this study was to examine the use of orthodontic 3-dimensional (3D) printing technology in North America and to understand why orthodontists are, or are not, incorporating 3D printing technology in their practices.

Methods

A survey questionnaire was delivered on a secure online platform, RedCap (Case Western Reserve University Clinical and Translational Science Award; no. UL1TR002548). The survey consisted of 14-34 items with branching logic. The association between participant demographics and in-house 3D printing was assessed using a chi-square test of independence.

Results

A total of 518 responses were recorded. The highest number of responses came from respondents in the 36-45-year age group. Most of the respondents were practice owners; 46.9% had 3D printers in their office. Chi-square tests of independence were performed on the data to see which associations existed. The strongest statistical associations with using an in-house 3D printer are seen with patient load, practice type, years since residency, and orthodontist’s position.

Conclusions

Approximately 75% of orthodontists use 3D printing technology in some capacity in North America. Major factors that influenced orthodontists to incorporate 3D printing technology into their office were self-interest and research. Major factors that have prevented orthodontists from not incorporating 3D printing technology into their office were space for equipment/ventilation and digital workflow training deficit. Orthodontists use their 3D printers mostly to make plastic retainers from printed models. The strongest associations with using in-house 3D printers are seen in patient load, practice type, years since residency, and orthodontist position. Increasing patient load and being in private practice increases the likelihood of having a 3D printer.

简介：本研究的目的是调查北美地区正畸三维（3D）打印技术的使用情况，并了解正畸医师在其临床实践中采用或不采用3D打印技术的原因：通过安全在线平台 RedCap（凯斯西储大学临床与转化科学奖，编号：UL1TR002548）发放调查问卷。调查问卷由 14-34 个项目组成，具有分支逻辑。采用卡方检验法评估了参与者人口统计学特征与内部 3D 打印之间的关联：结果：共收到 518 份回复。36-45 岁年龄组的受访者回答最多。大多数受访者是诊所所有者；46.9%的受访者在其办公室拥有 3D 打印机。对数据进行了独立的卡方检验，以了解存在哪些关联。使用内部 3D 打印机与患者数量、诊所类型、从业年限和正畸医生职位的统计关联性最强：结论：在北美，约 75% 的正畸医生在某种程度上使用 3D 打印技术。影响正畸医师将 3D 打印技术应用于其诊室的主要因素是自身利益和研究。阻碍正畸医生将 3D 打印技术应用于诊室的主要因素是设备/通风空间和数字化工作流程培训不足。正畸医生大多使用 3D 打印机根据打印模型制作塑料保持器。使用内部 3D 打印机与患者数量、诊所类型、实习年限和正畸医生职位的关系最为密切。病人数量的增加和私人执业会增加拥有 3D 打印机的可能性。

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引用次数: 0

Midpalatal miniscrew insertion: The accuracy of digital planning and surgical placement 腭中微型螺钉植入术：数字规划和手术置入的准确性。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.02.014

Adli M.Q. Al-Gazzawi , Vanessa Knode , Bjorn Ludwig , Alaa Othman , Angelo Salamini , Nikolaos Pandis , Padhraig S. Fleming

Introduction

The objective of this study was to investigate the accuracy of palatal miniscrew insertion, evaluating the effect of guide fabrication and surgical placement.

Methods

Guided insertion of bilateral paramedian palatal miniscrews was undertaken using Appliance Designer software (3Shape, Copenhagen, Denmark). A resin surgical guide (P Pro Surgical Guide; Straumann AG, Basel, Switzerland) was used. Superimposition of the miniscrew position relative to the digital design was undertaken using bespoke software (Inspect 3D module, OnyxCeph; Image Instruments GmbH, Chemnitz, Germany) to assess surgical inaccuracy. Miniscrew position relative to the surgical guide was also assessed to isolate the effect of planning inaccuracies. Both horizontal and vertical discrepancies were evaluated at both implant locations.

Results

Twenty-seven patients having bilateral palatal insertions were examined. Mean discrepancies were <0.5 mm, both in the horizontal and vertical planes. The mean overall horizontal and vertical discrepancy between the digital design and final miniscrew position on the left side was 0.32 ± 0.15 mm and 0.34 ± 0.17 mm, respectively. The maximum horizontal discrepancy observed was 0.72 mm. No significant differences were observed in relation to the accuracy of mini-implant positioning on the basis of sidedness, either for horizontal (P = 0.29) or vertical (P = 0.86) discrepancy.

Conclusions

High levels of accuracy associated with guided insertion of paramedian palatal implants were recorded with mean discrepancies of less than 0.5 mm both in the horizontal and vertical planes. No difference in accuracy was noted between the left and right sides. Very minor levels of inaccuracy associated both with surgical techniques and surgical guide fabrication were recorded.

方法使用 Appliance Designer 软件（3Shape，丹麦哥本哈根）引导插入双侧腭侧迷你螺钉。使用树脂手术导板（P Pro 手术导板；Straumann AG，瑞士巴塞尔）。使用定制软件（Inspect 3D 模块，OnyxCeph；Image Instruments GmbH，德国开姆尼茨）叠加微型螺钉相对于数字设计的位置，以评估手术的不准确性。此外，还评估了微型螺钉相对于手术导板的位置，以隔离规划不准确的影响。对两个种植体位置的水平和垂直偏差都进行了评估。水平面和垂直面的平均偏差均为 0.5 毫米。左侧数字设计和最终微型螺钉位置之间的平均水平和垂直差异分别为 0.32 ± 0.15 毫米和 0.34 ± 0.17 毫米。观察到的最大水平差异为 0.72 毫米。无论是水平偏差（P = 0.29）还是垂直偏差（P = 0.86），都没有观察到两侧微型种植体定位精度的明显差异。左右两侧的准确性没有差异。与手术技术和手术导板制作相关的误差都非常小。

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引用次数: 0

Surgical vs nonsurgical treatments in patients with anterior open bite have similar effects in occlusal function: A 2-year follow-up study 手术与非手术疗法对前开放性咬合患者咬合功能的影响相似：为期两年的随访研究。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.03.007

Jahan Asmat, Goyal Manish, Kumar Mukesh, Yadav Ekta

引用次数: 0

Time blindness 时间盲点

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.04.001

Laurance Jerrold

引用次数: 0

You are not alone 你并不孤单。

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.04.002

Peter M. Greco

引用次数: 0

Effect of varying auxiliaries on maxillary incisor torque control with clear aligners: A finite element analysis 使用透明矫治器时，不同辅助器械对上颌切牙扭矩控制的影响：有限元分析

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

American Journal of Orthodontics and Dentofacial Orthopedics

Pub Date : 2024-07-01 DOI: 10.1016/j.ajodo.2024.02.012

Ya-Ya Hong , Ting Kang , Meng-Qi Zhou , Jia-Yong Zhong , Xue-Peng Chen

Introduction

This study aimed to evaluate the effects of varying auxiliaries on tooth movement and stress distribution when maxillary central incisors were torqued 1° with a clear aligner through finite element analysis.

Methods

Three-dimensional finite element models, including maxillary alveolar bone, periodontal ligament, dentition, and clear aligner, were constructed. According to the auxiliaries designed on the maxillary central incisor, 5 models were created: (1) without auxiliaries (control model), (2) with the power ridge, (3) with the semi-ellipsoid attachment, (4) with the horizontal rectangular attachment, and (5) with the horizontal cylinder attachment. The tooth movement and periodontal ligament stress distribution after a palatal root torque of 1° were analyzed for each of the 5 models.

Results

With 1° torque predicted, the maxillary central incisor without auxiliaries showed a tendency of labial tipping, mesial tipping, and intrusion. The rotation center moved occlusally in the power ridge model. The labiolingual inclination variation increased in the semi-ellipsoid attachment model but decreased in the power ridge model. The maxillary central incisor is twisted in the distal direction in the power ridge model. The maxillary central incisor of the horizontal rectangular attachment and the horizontal cylinder attachment model behaved similarly to the control model. Periodontal stresses were concentrated in the cervical and apical areas. The maximum von Mises stresses were 11.6, 12.4, 3.81, 1.14, and 11.0 kPa in the 5 models. The semi-ellipsoid attachment model exhibited a more uniform stress distribution than the other models.

Conclusions

Semi-ellipsoid attachment performed better efficacy on labiolingual inclination, and power ridge performed better efficacy on root control. However, a distal twist of maxillary incisors could be generated by the power ridge.

方法建立了包括上牙槽骨、牙周韧带、牙体和透明矫治器在内的三维有限元模型。根据在上颌中切牙上设计的附着体，建立了 5 个模型：(1) 无附着体（对照模型），(2) 带动力脊，(3) 带半椭圆形附着体，(4) 带水平矩形附着体，(5) 带水平圆柱体附着体。结果在预测 1° 扭矩的情况下，无辅助装置的上颌中切牙表现出唇侧倾倒、中侧倾倒和内陷的趋势。在动力脊模型中，旋转中心向咬合方向移动。在半椭圆形附着体模型中，唇侧倾斜度变化增大，但在动力脊模型中，唇侧倾斜度变化减小。在动力脊模型中，上颌中切牙向远端方向扭曲。水平矩形附着体和水平圆柱体附着体模型的上颌中切牙表现与对照模型相似。牙周应力集中在牙颈部和根尖部位。5 个模型的最大 von Mises 应力分别为 11.6、12.4、3.81、1.14 和 11.0 千帕。结论半椭圆形附着体对唇侧倾斜有更好的疗效，而动力脊对牙根控制有更好的疗效。不过，动力脊可能会导致上颌切牙远端扭转。

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