Journal of the World Federation of Orthodontists最新文献_第4页

Nonsurgical treatment of an adult patient with severe transversal skeletal discrepancy: Tooth bone-borne tandem expander and hybrid aligner approach 对一名患有严重横向骨骼差异的成年患者进行非手术治疗：牙骨质串联扩张器和混合矫治器方法。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-10-01 DOI: 10.1016/j.ejwf.2024.03.008

Background

Although they have proven effective in the resolution of mild to moderate malocclusions, aligners demonstrate substantial limitations. More complex malocclusions therefore require a combination of auxiliaries, or a hybrid approach involving both aligners and fixed appliances, such as miniscrew-supported appliances or sectionals. This case report presents a 25-year-old female patient with a severe transversal discrepancy associated with an anterior open-bite tendency effectively treated with a tooth bone-borne palatal expander characterized by two expansion screws (tandem expander) and a hybrid treatment with aligners.

Methods

After accurate matching between the pretreatment cone-beam computed tomography scan and digital models, four self-drilling miniscrews were inserted palatally using a computer- aided design and computer-aided manufacturing surgical template to guide their correct and safe placement, and a tooth bone-borne appliance was fitted. After this first phase, the hybrid clear aligner approach was used to obtain alignment, leveling, and arch coordination, with the use of a partial lingual fixed appliance.

Results

Transverse maxillary deficiency was corrected, crowding has been resolved, Class I molar and canine relationship were obtained, and marginal ridges has been aligned.

Conclusions

Double jackscrew of the tandem expander enabled effective expansion of both the posterior segments as required to correct the skeletal discrepancy and the anterior region, thus relieving the dental crowding. Lingual sectional appliances have been shown to increase the effectiveness of clear aligners which, on the other hand, have been shown to be effective in closing the anterior bite by retroclination of the maxillary and mandibular incisors and, only minimally, by extrusion movements.

背景：尽管矫正器在解决轻度至中度错颌畸形方面被证明是有效的，但它也有很大的局限性。因此，更复杂的错合畸形需要结合使用辅助器械，或同时使用矫治器和固定矫治器（如微型螺钉支撑矫治器或分段矫治器）的混合方法。本病例报告的患者是一名25岁的女性，患有严重的横向不齐，并伴有前方开放咬合倾向，通过使用带有两个扩张螺钉的牙骨质腭侧扩张器（串联扩张器）和矫治器混合治疗，患者得到了有效的治疗：方法：在对治疗前的锥形束计算机断层扫描和数字模型进行精确匹配后，使用计算机辅助设计和计算机辅助制造的手术模板，在腭部植入四个自钻微型螺钉，以指导其正确安全地放置，并安装牙骨质矫治器。第一阶段结束后，使用混合透明矫治器方法进行对齐、矫平和牙弓协调，并使用部分舌侧固定矫治器：结果：上颌横向缺损得到了矫正，拥挤问题得到了解决，获得了I类臼齿和犬齿关系，边缘嵴得到了对齐：结论：串联扩弓器的双头螺钉能够有效扩弓后部，以矫正骨骼差异和前部，从而缓解牙齿拥挤。事实证明，舌侧矫治器可以提高透明矫治器的矫治效果，而透明矫治器则可以通过上下颌切牙的后倾和挤压运动有效关闭前牙咬合。

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引用次数: 0

Comparison of the accuracy of bracket axial positioning with and without radiographic support and according to practitioner experience: A three-dimensional study 有无射线支持下支架轴向定位精度的比较，以及根据从业者经验进行的比较：三维研究。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-10-01 DOI: 10.1016/j.ejwf.2024.03.007

Introduction

Accurate bracket positioning remains challenging. To avoid angulation errors, some recommend examining the panoramic radiograph during bonding. However, it can cause distortions. Cone-beam computed tomography (CBCT) provides a more precise panoramic reconstruction but with higher radiation doses. The main objective of this study is to compare the accuracy of axial positioning between direct bonding without radiography, with conventional panoramic radiograph, and with panoramic reconstruction from CBCT. The secondary objectives are to evaluate positioning accuracy of each tooth and to assess the influence of practitioner level of experience.

Methods

Thirty practitioners, divided into two groups based on their experience performed direct bonding on a model thrice: without radiography, then with the conventional panoramic radiograph, then with the panoramic reconstruction from CBCT. Models were scanned, and angulation errors were measured using OrthoAnalyzer. Values were compared using the Friedman's test followed by the Bonferroni correction for multiple comparisons (P-value = 0.05).

Results

For the low level of experience group, angulation errors were significantly greater than the accepted limit without radiographic reference, and significantly lower with CBCT reconstruction. For the high level of experience group, angulation errors were significantly lower than the accepted limit for the three bonding methods. For every tooth, using the panoramic reconstruction from CBCT as a reference, was the most accurate method, regardless of the level of experience. More experienced practitioners made fewer errors for the three methods.

Conclusions

Panoramic reconstruction from CBCT is the most accurate method to limit angulation errors during direct bonding. Conventional panoramic radiography remains a reliable tool if used with caution. Bonding without any radiographic reference should be avoided especially for less experienced practitioners.

介绍：精确的托槽定位仍然具有挑战性。为了避免角度误差，有人建议在粘接时检查全景照片。然而，这可能会导致变形。锥形束计算机断层扫描（CBCT）可提供更精确的全景重建，但辐射剂量较高。本研究的主要目的是比较无放射线照相直接粘接、传统全景放射线照相和CBCT全景重建之间的轴向定位精度。次要目标是评估每颗牙齿的定位精度，并评估从业者经验水平的影响：根据经验分为两组的 30 名牙科医生对模型进行了三次直接粘接：先是不进行射线照相，然后进行传统全景照相，最后进行 CBCT 全景重建。扫描模型，使用 OrthoAnalyzer 测量角度误差。使用弗里德曼检验比较数值，然后使用 Bonferroni 校正进行多重比较（P 值 = 0.05）：结果：低经验组的角度误差在没有放射线参考的情况下明显大于公认的极限，而在 CBCT 重建的情况下则明显降低。对于高经验组，三种粘接方法的角度误差都明显低于公认的限值。对于每颗牙齿，无论经验水平如何，使用 CBCT 全景重建作为参考都是最准确的方法。在这三种方法中，经验更丰富的医生出错更少：结论：CBCT全景重建是限制直接粘接过程中角度误差的最准确方法。如果谨慎使用，传统的全景放射摄影仍然是一种可靠的工具。应避免在没有任何射线参考的情况下进行粘接，尤其是经验不足的医生。

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引用次数: 0

Molar incisor hypomineralization (MIH): The “Why, What and How” of decision making for orthodontists 磨牙切牙低矿化（MIH）：正畸医生决策的 "原因、内容和方法"。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-10-01 DOI: 10.1016/j.ejwf.2024.09.001

Nikhillesh Vaiid , Adith Venugopal , Narayan Gandedkar , Mauro Farella , M. Ali Darendeliler , Samar M. Adel , Ludovica Nucci

Molar-incisor hypomineralization (MIH) presents a significant clinical challenge in orthodontics, with its complex etiology, variable presentation, and profound impact on enamel homeostasis. Utilizing Simon Sinek's “Golden Circle” method, this article systematically explores the implications of MIH within orthodontic practice. The “Why” emphasizes the critical need for orthodontists to understand MIH, given its prevalence and potential to disrupt treatment outcomes. MIH affects up to 40.2% of the global population, and its association with increased caries risk, hypersensitivity, and restorative failures necessitates an informed approach to management. The “What” section addresses the importance of recognizing the phenotypic variability of MIH and its influence on oral health-related quality of life. MIH impacts social and psychological well-being, particularly when anterior teeth are involved, and complicates orthodontic treatment due to challenges in bonding, banding, and restorative protocols. The “How” provides practical guidelines for orthodontic management, including diagnostic considerations, tooth restoration strategies, and the complexities of first permanent molar extractions. Strategic planning is essential to avoid complications such as mesial drift, overeruption, or space loss, with a multidisciplinary approach often required. This article highlights the importance of long-term monitoring and patient-centered care in managing MIH-affected teeth, underscoring the evolving nature of clinical protocols. By framing the discussion through the Golden Circle, this critical review offers a structured and impactful approach to understanding and addressing MIH within orthodontic contexts, aiming to enhance treatment outcomes and patient quality of life.

磨牙-尖牙低矿化（MIH）是口腔正畸学中的一项重大临床挑战，其病因复杂，表现形式多变，对釉质稳态影响深远。本文利用西蒙-辛克的 "黄金圈 "方法，系统地探讨了MIH对正畸实践的影响。为什么 "强调，鉴于MIH的普遍性和破坏治疗效果的可能性，正畸医师迫切需要了解MIH。MIH影响着全球高达40.2%的人口，它与龋齿风险增加、过敏和修复失败有关，因此有必要采取知情的管理方法。什么 "部分阐述了认识 MIH 表型变异及其对口腔健康相关生活质量影响的重要性。MIH会影响社交和心理健康，尤其是在涉及前牙的情况下，并且由于粘接、带环和修复方案的挑战而使正畸治疗复杂化。如何 "为正畸管理提供了实用指南，包括诊断注意事项、牙齿修复策略以及第一恒磨牙拔除的复杂性。战略规划对于避免并发症（如中侧漂移、过度破裂或间隙丧失）至关重要，通常需要采用多学科方法。本文强调了在管理受MIH影响的牙齿时，长期监测和以患者为中心的护理的重要性，并强调了临床方案不断发展的性质。通过 "黄金圈 "的讨论框架，这篇评论性文章为在正畸背景下理解和解决MIH问题提供了一种结构化和有影响力的方法，旨在提高治疗效果和患者的生活质量。

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引用次数: 0

Evaluating the efficacy of platelet-rich plasma on orthodontic tooth movement rate: A systematic review and meta-analysis 评估富血小板血浆对正畸牙齿移动率的疗效：系统回顾和荟萃分析。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-10-01 DOI: 10.1016/j.ejwf.2024.04.003

Background

The main objective of this study was to evaluate the effect of autologous platelet-rich plasma (PRP) on acceleration of the orthodontic tooth movement and assess the evidence based on the available literature.

Methods

The trial was registered and reported according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Electronic databases including PubMed, Cochrane, Scopus, Central Register of Controlled Trials, and Google Scholar were searched for randomized controlled studies of PRP on the rate of tooth movement. The search was restricted to articles published in English between January 2000 to 31 December 2023. The search was completed by two reviewers independently and the risk of bias was evaluated using the Cochrane Risk of Bias tool (RoB 2.0) and meta-analysis was performed. Grading of Recommendations Assessment, Development, and Evaluation (GRADE) was done to determine the certainty of evidence.

Results

Thirteen studies were included in the systematic review and 10 were included in the quantitative analysis. A random-effects model for meta-analysis of seven studies evaluating the rate of canine retraction revealed a statistically significant increase in the rate of orthodontic tooth movement of 0.38 mm/month in 1 month (121 patients; 95% confidence interval [CI] 0.27–0.49; I² = 35%; P < 0.001) which decreased to 0.09mm/month in the fourth month (80 patients; 95% CI 0.02–0.17; I² = 0%; P < 0.02). Three studies that considered en masse retraction revealed a mean difference of 0.36mm over 3 months (40 patients; 95% CI −0.23 to 0.94; I² = 74%; P < 0.23).

Conclusions

The study suggests that PRP application can accelerate tooth movement, but its effects decreased over 4 months. The results should be interpreted cautiously due to the study's inherent limitations.

背景：本研究的主要目的是评估自体富血小板血浆（PRP）对加速正畸牙齿移动的效果，并根据现有文献评估相关证据：本研究的主要目的是评估自体富血小板血浆（PRP）对加速正畸牙齿移动的效果，并根据现有文献对证据进行评估：方法：根据《系统综述和元分析首选报告项目》指南对试验进行登记和报告。在PubMed、Cochrane、Scopus、对照试验中央注册中心和谷歌学术等电子数据库中搜索了PRP对牙齿移动速度的随机对照研究。搜索仅限于 2000 年 1 月至 2023 年 12 月 31 日期间发表的英文文章。检索由两名审稿人独立完成，使用 Cochrane 偏倚风险工具 (RoB 2.0) 评估偏倚风险并进行荟萃分析。采用建议评估、发展和评价分级法（GRADE）确定证据的确定性：13项研究被纳入系统综述，10项研究被纳入定量分析。采用随机效应模型对七项评估犬齿牵引率的研究进行了荟萃分析，结果显示，正畸牙齿移动率在1个月内出现了统计学意义上的显著增加，达到了0.38毫米/月（121名患者；95%置信区间[CI] 0.27-0.49；I2 = 35%；P < 0.001），而在第四个月内则降至0.09毫米/月（80名患者；95% CI 0.02-0.17；I2 = 0%；P < 0.02）。三项考虑整体回缩的研究显示，3个月的平均差异为0.36毫米（40名患者；95% CI -0.23至0.94；I2 = 74%；P < 0.23）：研究表明，应用 PRP 可加速牙齿移动，但其效果在 4 个月后有所下降。结论：该研究表明，应用 PRP 可加速牙齿移动，但其效果在 4 个月后有所下降。由于该研究本身存在局限性，因此应谨慎解读研究结果。

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引用次数: 0

Effect of printing technology, layer height, and orientation on assessment of 3D-printed models 打印技术、层高和方向对 3D 打印模型评估的影响

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-08-01 DOI: 10.1016/j.ejwf.2024.03.006

Background

Three-dimensional (3D) printing technologies have become popular in orthodontics. The aim of this study is to determine the effect of printing technology, orientation, and layer height on the accuracy of 3D-printed dental models.

Methods

The maxillary arch of a post-treatment patient was scanned and printed at different orientations (0°, 90°) and layer thicknesses (25 µm, 50 µm, 100 µm, and 175 µm) using two different printing technologies (digital light processing and stereolithography). The 120 models were digitally scanned, and their average deviation from the initial model was analyzed using 3D algorithm. A multivariable linear regression analysis was used to estimate the effect of all variables on the average deviation from the initial model for the common layer thicknesses (50/100 µm). Finally, one-way ANOVA and Tukey posthoc test was used to compare the stereolithography (SLA) 25 µm and digital light processing (DLP) 175 µm groups with the groups that showed the least average deviation in the former analysis.

Results

The multivariable linear regression analysis showed that the DLP 50 µm (mean ± SD: −0.022 ± 0.012 mm) and 100 µm (mean ± SD: −0.02 ± 0.009 mm) horizontally printed models showed the least average deviation from the initial model. Finally, the DLP 175 µm horizontally printed models (mean ± SD: 0.015 ± 0.005 mm) and the SLA 25 µm horizontally (mean ± SD: 0.011 ± 0.005 mm) printed models were more accurate.

Conclusions

All the models showed dimensional accuracy within the reported clinically acceptable limits. The highest accuracy was observed with DLP printer, 175 µm layer thickness, and horizontal orientation followed by SLA printer, 25 µm layer thickness, and horizontal orientation.

背景三维（3D）打印技术已在口腔正畸学中流行起来。本研究的目的是确定打印技术、方向和层高对三维打印牙科模型精度的影响。方法对一名治疗后患者的上颌牙弓进行扫描，并使用两种不同的打印技术（数字光处理和立体光刻）以不同的方向（0°、90°）和层厚（25 微米、50 微米、100 微米和 175 微米）进行打印。对 120 个模型进行了数字扫描，并使用 3D 算法分析了它们与初始模型的平均偏差。采用多变量线性回归分析来估计所有变量对普通层厚（50/100 微米）的初始模型平均偏差的影响。结果多元线性回归分析表明，DLP 50 µm（平均值±标准差：-0.022 ± 0.012 毫米）和 100 µm（平均值±标准差：-0.02 ± 0.009 毫米）水平打印模型与初始模型的平均偏差最小。最后，DLP 175 微米水平打印模型（平均值±标准差：0.015 ± 0.005 毫米）和 SLA 25 微米水平打印模型（平均值±标准差：0.011 ± 0.005 毫米）的精度更高。DLP 打印机、175 微米层厚和水平方向的精度最高，其次是 SLA 打印机、25 微米层厚和水平方向。

{"title":"Effect of printing technology, layer height, and orientation on assessment of 3D-printed models","authors":"","doi":"10.1016/j.ejwf.2024.03.006","DOIUrl":"10.1016/j.ejwf.2024.03.006","url":null,"abstract":"<div><h3>Background</h3><p>Three-dimensional (3D) printing technologies have become popular in orthodontics. The aim of this study is to determine the effect of printing technology, orientation, and layer height on the accuracy of 3D-printed dental models.</p></div><div><h3>Methods</h3><p>The maxillary arch of a post-treatment patient was scanned and printed at different orientations (0°, 90°) and layer thicknesses (25 µm, 50 µm, 100 µm, and 175 µm) using two different printing technologies (digital light processing and stereolithography). The 120 models were digitally scanned, and their average deviation from the initial model was analyzed using 3D algorithm. A multivariable linear regression analysis was used to estimate the effect of all variables on the average deviation from the initial model for the common layer thicknesses (50/100 µm). Finally, one-way ANOVA and Tukey posthoc test was used to compare the stereolithography (SLA) 25 µm and digital light processing (DLP) 175 µm groups with the groups that showed the least average deviation in the former analysis.</p></div><div><h3>Results</h3><p>The multivariable linear regression analysis showed that the DLP 50 µm (mean ± SD: −0.022 ± 0.012 mm) and 100 µm (mean ± SD: −0.02 ± 0.009 mm) horizontally printed models showed the least average deviation from the initial model. Finally, the DLP 175 µm horizontally printed models (mean ± SD: 0.015 ± 0.005 mm) and the SLA 25 µm horizontally (mean ± SD: 0.011 ± 0.005 mm) printed models were more accurate.</p></div><div><h3>Conclusions</h3><p>All the models showed dimensional accuracy within the reported clinically acceptable limits. The highest accuracy was observed with DLP printer, 175 µm layer thickness, and horizontal orientation followed by SLA printer, 25 µm layer thickness, and horizontal orientation.</p></div>","PeriodicalId":43456,"journal":{"name":"Journal of the World Federation of Orthodontists","volume":"13 4","pages":"Pages 169-174"},"PeriodicalIF":2.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140772827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Male-to-female transgenders demonstrated unique perspectives on perceived facial attractiveness and orthognathic surgery need 男变女的变性人在感知面部吸引力和正颌手术需求方面表现出独特的视角。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-08-01 DOI: 10.1016/j.ejwf.2024.03.001

Purpose

The esthetic preference and decision concerning undergoing orthognathic surgery in the transgender population have not been reported. The aims of this study were to examine the influence of the sagittal mandibular position on the esthetic perception and perceived surgery need in male-to-female transgenders (MTFTs) compared with male and female laypeople.

Materials and Methods

A questionnaire study was performed by male-to-female transgender, male and female laypeople. Three-dimensional black & white male and female facial images with facial contour angle (FCA) of 3°, 1°, 5°, 9°,13°, 17°, and 21° were shown to the participants. The participants scored the images’ perceived facial attractiveness using visual analog scales (VAS) and indicated whether orthognathic surgery was needed.

Results

The participants included 85 MTFTs, 85 males, and 85 females. The results revealed that there were significant differences in the VAS scores between the MTFT and male participants. The MTFTs rated the male images with prognathism of 1° and -3°FCA in significantly lower scores compared with the males (P = 0.033, P = 0.010). Female images with prognathism 1°FCA was rated by the MTFTs in significantly lower scores compared with the males (P = 0.041). A significantly higher number of surgery needs was found in the MTFTs compared with the other groups.

Conclusions

Gender influences esthetic perception and the decision to undergo orthognathic surgery. MTFTs have a unique perspective on facial esthetics, being more desirous of surgery than males and females. Clinicians should be aware of the ideal expectation in facial esthetics in MTFTs.

目的关于变性人的审美偏好和接受正颌外科手术的决定尚未见报道。本研究旨在探讨与男性和女性普通人相比，下颌矢状位对男变女变性者（MTFTs）的审美感知和手术需求感知的影响。向参与者展示了面部轮廓角（FCA）为 3°、1°、5°、9°、13°、17° 和 21°的黑色和白色男性和女性三维面部图像。参与者使用视觉模拟量表（VAS）对图片的面部吸引力进行评分，并指出是否需要进行正颌外科手术。结果显示，MTFT 和男性参与者的 VAS 分数存在显著差异。与男性相比，MTFT 对前突 1° 和 -3°FCA 的男性图像的评分明显较低（P = 0.033，P = 0.010）。与男性相比（P = 0.041），MTFTs 对前突 1°FCA 的女性图像评分明显较低。与其他组别相比，MTFTs 的手术需求数量明显更高。MTFTs 对面部美学有独特的见解，他们比男性和女性更渴望手术。临床医生应了解 MTFTs 对面部美学的理想期望。

{"title":"Male-to-female transgenders demonstrated unique perspectives on perceived facial attractiveness and orthognathic surgery need","authors":"","doi":"10.1016/j.ejwf.2024.03.001","DOIUrl":"10.1016/j.ejwf.2024.03.001","url":null,"abstract":"<div><h3>Purpose</h3><p>The esthetic preference and decision concerning undergoing orthognathic surgery in the transgender population have not been reported. The aims of this study were to examine the influence of the sagittal mandibular position on the esthetic perception and perceived surgery need in male-to-female transgenders (MTFTs) compared with male and female laypeople.</p></div><div><h3>Materials and Methods</h3><p>A questionnaire study was performed by male-to-female transgender, male and female laypeople. Three-dimensional black & white male and female facial images with facial contour angle (FCA) of 3°, 1°, 5°, 9°,13°, 17°, and 21° were shown to the participants. The participants scored the images’ perceived facial attractiveness using visual analog scales (VAS) and indicated whether orthognathic surgery was needed.</p></div><div><h3>Results</h3><p>The participants included 85 MTFTs, 85 males, and 85 females. The results revealed that there were significant differences in the VAS scores between the MTFT and male participants. The MTFTs rated the male images with prognathism of 1° and -3°FCA in significantly lower scores compared with the males (<em>P</em> = 0.033, <em>P</em> = 0.010). Female images with prognathism 1°FCA was rated by the MTFTs in significantly lower scores compared with the males (<em>P</em> = 0.041). A significantly higher number of surgery needs was found in the MTFTs compared with the other groups.</p></div><div><h3>Conclusions</h3><p>Gender influences esthetic perception and the decision to undergo orthognathic surgery. MTFTs have a unique perspective on facial esthetics, being more desirous of surgery than males and females. Clinicians should be aware of the ideal expectation in facial esthetics in MTFTs.</p></div>","PeriodicalId":43456,"journal":{"name":"Journal of the World Federation of Orthodontists","volume":"13 4","pages":"Pages 162-168"},"PeriodicalIF":2.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140790164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retrospective evaluation of the success rate and factors associated with the stability of alveolar ridge orthodontic miniscrews: Pilot study 牙槽嵴正畸微型螺钉成功率及稳定性相关因素的回顾性评估：试点研究。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-08-01 DOI: 10.1016/j.ejwf.2024.02.001

Background

An uncommon location for placing miniscrews, used to provide anchorage control in various tooth movements, is the alveolar ridge. This study aimed to provide an evaluation of the success rate of alveolar ridge miniscrews and examine variables that might impact their success.

Methods

Charts for 295 patients who had miniscrews were screened. Twenty patients (5 male and 15 female: average age = 38.15 ± 15.10 years) with a total of 50 alveolar ridge miniscrews were analyzed. A customized data form was used to collect patients’ and miniscrews’ related variables. Kaplan–Meier estimator was used for the survival function, whereas Cox proportional hazards regression models were used to associate collected variables with alveolar ridge miniscrew survival.

Results

In total, 31 (62.0%) miniscrews were stable and 19 (38.0%) failed. The survival time for those that failed was 6.03 ± 7.08 months. The follow-up period for those that survived was 35.84 ± 19.47 months. Male gender versus female (hazard ratio [HR] 2.46; 95% confidence interval [CI] 1.35–4.48; P = 0.003), and if the miniscrew was a replacement versus non-replacement (HR 0.27; 95% CI 0.07–0.99; P = 0.048) influenced the survival. Additionally, miniscrews that were used for both indirect and direct or indirect anchorage alone plus those with evidence of splinting showed a 100% survival rate, which led to an HR 0 (P < 0.001). When the previously mentioned variables were modeled, none seemed to have a significant effect on failure except for splinting and type of anchorage (P < 0.001), because none of the splinted miniscrews failed.

Conclusions

The failure rate of alveolar ridge miniscrews was (38.0%) over 6.03 ± 7.08 months. The survival rate was (62.0%) over 35.84 ± 19.47 months. The evidence of splinting and the type of anchorage had a significant effect on survival probability.

背景牙槽嵴是一个不常见的放置微型螺钉的位置，用于在各种牙齿移动中提供锚定控制。本研究旨在评估牙槽嵴微型螺钉的成功率，并研究可能影响其成功率的变量。分析了 20 名患者（5 名男性和 15 名女性：平均年龄 = 38.15 ± 15.10 岁）共 50 次牙槽嵴部迷你螺钉手术。使用定制的数据表收集患者和迷你螺钉的相关变量。结果总共有 31 个（62.0%）迷你螺钉稳定，19 个（38.0%）失败。失败迷你螺钉的存活时间为 6.03 ± 7.08 个月。存活者的随访时间为（35.84 ± 19.47）个月。男性与女性（危险比 [HR] 2.46；95% 置信区间 [CI]1.35-4.48；P = 0.003）以及微型螺钉是替换的还是非替换的（HR 0.27；95% CI 0.07-0.99；P = 0.048）对存活率有影响。此外，同时用于间接和直接固定的微型螺钉或仅用于间接固定的微型螺钉以及有夹板证据的微型螺钉的存活率为 100%，这导致 HR 为 0 (P < 0.001)。在对前面提到的变量进行建模时，除了夹板和锚定类型（P <0.001）外，其他变量似乎都不会对失败产生显著影响，因为夹板微型螺钉无一失败。存活率为（62.0%），超过 35.84 ± 19.47 个月。夹板和固定方式对存活率有显著影响。

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引用次数: 0

Uprighting a mesially impacted mandibular second molar with scissor bite using simple tubes 使用简易管道上提患有剪刀式咬合的下颌第二磨牙。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-08-01 DOI: 10.1016/j.ejwf.2024.02.002

Orthodontic uprighting or traction of an impacted mandibular second molar often necessitates invasive interventions. This report aims to illustrate the utilization of nickel-titanium wire segments inserted into small, simple tubes for uprighting mesially impacted mandibular second molars and also for scissor bite correction. The term “simple tube” refers to a tube without a bonding base attached to a tooth surface by covering it with flowable composite resin. Due to the absence of a bonding base, the simple tube is characterized by its diminutive size and minimal profile height, facilitating placement on partially exposed second molars and unconventional positioning to adjust the force geometry. In this case study, mesially-impacted mandibular second molars with scissor bite were uprighted in a 21-year-old male utilizing simple tubes. Simple tubes can be used for molar uprighting and scissor bite correction buccally and lingually.

对受影响的下颌第二磨牙进行正畸直立或牵引通常需要进行侵入性干预。本报告旨在说明如何利用插入小型简易管中的镍钛金属丝段来直立间向受撞击的下颌第二磨牙，以及进行剪刀式咬合矫正。所谓 "简易管"，是指没有粘结基底的管子，通过覆盖可流动的复合树脂将其固定在牙齿表面。由于没有粘结基底，简易管的特点是体积小、外形高度低，便于在部分暴露的第二磨牙上安装，也便于进行非常规定位以调整受力几何。在本病例研究中，一名 21 岁的男性利用简易管直立了具有剪状咬合的下颌第二磨牙。简易管可用于臼齿直立和颊舌侧剪刀状咬合矫正。

引用次数: 0

Bilateral distalization of maxillary first molars in a group of adult patients after extraction of maxillary second molars using infra-zygomatic mini-implants: A prospective clinical trial 一组成年患者在拔除上颌第二磨牙后使用颧骨下微型种植体进行上颌第一磨牙双侧远端化：前瞻性临床试验。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-08-01 DOI: 10.1016/j.ejwf.2024.03.005

Background

It is now possible to predictably distalize maxillary first molars in nongrowing patients with the infra-zygomatic gear distalizer and to improve malocclusions without having to extract the premolars and regardless of the patient's compliance. The purpose of this study was to investigate the amount and rate of distal movement of the maxillary first molars using our proposed appliance after extraction of maxillary second molars.

Methods

Ten nongrowing female patients successfully treated with our proposed appliance were the subjects of this study. The amount, rate, and type of distalization, were analyzed through upper jaw cone beam computed tomography (pre- and post-treatment) and scanned casts taken on a monthly interval.

Results

The average amount of distalization of the maxillary first molars was 4.03 mm at the crown level and 2.88 mm at the root level. The rate of distalization had an average of 0.61 mm per month with a maximum of 0.79 mm in the first month because of the regional acceleratory phenomena after extracting the maxillary second molar.

Conclusions

The maxillary first molars were distalized in a significant manner and all patients reached a Class I relation within an average duration of 6.4 months. The proposed appliance proved to be a viable noncompliance modality to distalize maxillary first molars correcting maxillary Class II malocclusions characterized by maxillary protrusion or maxillary incisor crowding.

背景现在可以使用颧下齿轮远端矫治器对非生长期患者的上颌第一磨牙进行可预测的远端矫治，并在不拔除前磨牙的情况下改善畸形，而无需考虑患者的依从性。本研究的目的是调查上颌第二磨牙拔除后，使用我们建议的矫治器进行上颌第一磨牙远端移动的数量和速度。通过上颌锥形束计算机断层扫描（治疗前和治疗后）和每月采集的扫描铸模，对远化的数量、速度和类型进行了分析。由于拔除上颌第二磨牙后会出现区域性加速现象，因此上颌第一磨牙的远化速度平均为每月 0.61 毫米，第一个月最大为 0.79 毫米。结论上颌第一磨牙的远化效果显著，所有患者都在平均 6.4 个月的时间内达到了 I 类关系。事实证明，该矫治器是一种可行的非依从性上颌第一磨牙远端矫治方式，可纠正以上颌前突或上颌切牙拥挤为特征的上颌二类错合畸形。

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引用次数: 0

Integrating artificial intelligence: A step forward in orthodontic education 整合人工智能：正畸教育向前迈进了一步。

IF 2.6 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of the World Federation of Orthodontists

Pub Date : 2024-08-01 DOI: 10.1016/j.ejwf.2024.07.002

Vinod Krishnan

引用次数: 0