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Effect of 125 Hz and 150 Hz vibrational frequency electric toothbrushes on the rate of orthodontic tooth movement and prostaglandin E2 levels. 125Hz和150Hz振动频率电动牙刷对正畸牙齿移动速率和前列腺素E2水平的影响。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-09-25 DOI: 10.4041/kjod23.076
Anadha N Gujar, Prashantha Govinakovi Shivamurthy

Objective: To evaluate the effects of an electric toothbrush with vibrational frequencies of 125 Hz and 150 Hz on the orthodontic tooth movement (OTM) rate and the production of prostaglandin E2 (PGE2).

Methods: Out of thirty patients (aged 18-25 years; 16 females and 14 males), ten patients each formed Group A and B, who used electric toothbrushes with 125 Hz and 150 Hz vibrations, respectively. The remaining ten patients (Group C) served as the control group and did not use electric toothbrushes. The rate of OTM and levels of PGE2 using microcapillary pipettes were calculated before the start of retraction (T0), on the 30th day (T1), on the 60th day (T2), and on the 90th day (T3) from the start of retraction in all the groups.

Results: There was a statistically significant difference in the mean OTM values and PGE2 levels in all three groups at different time intervals, with the maximum difference seen in Group B compared to Group A and least in Group C at T1, T2 and T3.

Conclusions: The rate of OTM and levels of PGE2 were highest in patients who used an electric toothbrush with 150 Hz mechanical vibration compared to those who used an electric toothbrush with 125 Hz mechanical vibration and least in patients who did not use an electric toothbrush. Mechanical vibration led to an increase in the PGE2 levels and accelerated the OTM.

目的:评价125Hz和150Hz振动频率的电动牙刷对正畸牙齿运动(OTM)速率和前列腺素E2(PGE2)产生的影响。方法:在30名患者(年龄18-25岁;16名女性和14名男性)中,10名患者分别组成A组和B组,分别使用125 Hz和150 Hz振动的电动牙刷。其余10名患者(C组)作为对照组,不使用电动牙刷。使用微毛细管移液管在所有组的回缩开始前(T0)、第30天(T1)、第60天(T2)和第90天(T3)计算OTM的速率和PGE2的水平。结果:三组在不同时间间隔的平均OTM值和PGE2水平均存在统计学显著差异,其中B组与a组相比差异最大,C组在T1时差异最小,结论:与使用125Hz机械振动电动牙刷的患者相比,使用150Hz机械振动的电动牙刷的OTM发生率和PGE2水平最高,而不使用电动牙刷的病人OTM和PGE2含量最低。机械振动导致PGE2水平升高并加速OTM。
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引用次数: 1
Pattern of lip retraction according to the presence of lip incompetence in patients with Class II malocclusion. ⅱ类错颌患者唇部功能不全时的唇回缩模式。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod22.260
Mei Ling Fang, Sung-Hwan Choi, Yoon Jeong Choi, Kee-Joon Lee

Objective: The aim of this retrospective study was to compare changes in hard tissue and soft tissue after the four first premolars were extracted with anterior teeth retraction according to the presence or absence of lip incompetence.

Methods: Patients who underwent the four first premolars were extracted with anterior teeth retraction were divided into competent (n = 20) and incompetent lip (n = 20) groups. Cephalometric measurements for hard tissue and soft tissue changes were performed pre-treatment and post-treatment.

Results: In the competent group, the upper and lower lips retreated by 2.88 mm and 4.28 mm, respectively, and in the incompetent group by 4.13 mm and 5.57 mm, respectively; the differences between the two groups were significant (p < 0.05). A strong positive correlation between retraction of the upper lip and upper incisors was observed in both groups (p < 0.05), whereas a correlation between retraction of the lower lip and lower incisors was only found in the incompetent group. A simple linear regression analysis showed that the pattern of lip retraction following the retraction of the anterior teeth was more predictable in the incompetent group than in the competent group.

Conclusions: These findings suggest that the initial evaluation of lip incompetence in patients with skeletal Class II is essential for the accurate prediction of the soft tissue changes following retraction of the anterior teeth in premolar extraction treatment. Therefore, sufficient explanation should be provided during patient consultations.

目的:通过回顾性研究,比较4颗第一前磨牙在唇功能不全和唇功能不全情况下的硬组织和软组织变化。方法:采用前牙后缩法拔除4颗第一前磨牙的患者分为称职(n = 20)组和不称职(n = 20)组。在治疗前和治疗后分别进行硬组织和软组织变化的头部测量。结果:正常组上下唇分别后退2.88 mm和4.28 mm,不正常组上下唇分别后退4.13 mm和5.57 mm;两组比较差异有统计学意义(p < 0.05)。两组患者的上唇和上切牙的内伸量呈显著正相关(p < 0.05),下唇和下切牙的内伸量呈正相关(p < 0.05)。简单的线性回归分析表明,无能组的前牙后唇后缩模式比有能力组更容易预测。结论:骨骼ⅱ类患者唇功能不全的初步评估对于准确预测前磨牙拔牙后前牙后软组织变化至关重要。因此,在患者咨询时应提供充分的解释。
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引用次数: 0
Differences in positions of cone-beam computed tomography landmarks in patients with skeletal Class III facial asymmetry according to midsagittal planes. 骨ⅲ类面部不对称患者中矢状面锥形束ct标志位置的差异。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod23.015
Hyung-Kyu Noh, Ho-Jin Kim, Hyo-Sang Park

Objective: This study aimed to clarify differences in the positions of cone-beam computed tomography (CBCT) landmarks according to different midsagittal planes (MSPs) in patients with skeletal Class III facial asymmetry.

Methods: Pre-treatment CBCT data from 60 patients with skeletal Class III were used. The patients were classified into symmetric (menton deviations of < 2 mm) or asymmetric (menton deviations of > 4 mm) groups. Six MSPs were established based on previous studies, and three-dimensional analyses were performed for the planes in both the groups. The measurement outcomes were compared statistically.

Results: A statistically significant interaction (p < 0.01) was observed between MSPs and facial asymmetry. No significant differences were observed among MSPs in the symmetric group. However, significant differences in linear measurements were identified among MSPs in the asymmetric group. Specifically, the upper facial MSP revealed both maxillary and mandibular transverse asymmetries. On the other hand, anterior nasal spine (ANS)-associated MSP could not identify maxillary asymmetry. Furthermore, the menton deviation was approximately 3 mm lower when estimated using the ANS-associated MSP than that using upper facial MSP.

Conclusions: The choice of MSP can significantly affect treatment outcomes while diagnosing patients with asymmetry. Therefore, care should be taken when selecting MSP in clinical practice.

目的:本研究旨在阐明骨型III型面部不对称患者不同正中矢状面(MSPs)锥束计算机断层扫描(CBCT)标志位置的差异。方法:使用60例骨骼III类患者治疗前的CBCT数据。将患者分为对称组(晶状体偏差< 2mm)和非对称组(晶状体偏差> 4mm)。在前人研究的基础上建立了6个msp,并对两组的平面进行了三维分析。对测量结果进行统计学比较。结果:MSPs与面部不对称有显著的交互作用(p < 0.01)。对称组msp间无显著差异。然而,在不对称组的msp中发现了线性测量的显着差异。具体而言,上面部MSP显示上颌和下颌横向不对称。另一方面,鼻前棘(ANS)相关的MSP不能识别上颌不对称。此外,与使用上面部MSP相比,使用ans相关MSP估计的心智偏差约低3mm。结论:在诊断不对称患者时,MSP的选择对治疗结果有显著影响。因此,在临床实践中选择MSP时应谨慎。
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引用次数: 0
A novel method for testing accuracy of bite registration using intraoral scanners. 一种利用口腔内扫描仪检测咬合配准精度的新方法。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod22.199
Lydia Kakali, Demetrios J Halazonetis

Objective: The evidence on the accuracy of bite registration using intraoral scanners is sparse. This study aimed to develop a new method for evaluating bite registration accuracy using intraoral scanners.

Methods: Two different types of models were used; 10 stone models and 10 with acrylic resin teeth. A triangular frame with cylindrical posts at each apex (one anterior and two posteriors) was digitally designed and manufactured using three-dimensional (3D) printing. Such a structure was fitted in the lingual space of each maxillary and mandibular model so that, in occlusion, the posts would contact their opposing counterparts, enforcing a small interocclusal gap between the two arches. This ensured no tooth interference and full contact between opposing posts. Bite registration accuracy was evaluated by measuring the distance between opposing posts, with small values indicating high-accuracy. Three intraoral scanners were used: Medit i500, Primescan, and Trios 4. Viewbox software was used to measure the distance between opposing posts and compute roll and pitch.

Results: The average maximum error in interocclusal registration exceeded 50 μm. Roll and pitch orientation errors ranged above 0.1 degrees, implying an additional interocclusal error of around 40 μm or more. The models with acrylic teeth exhibited higher errors.

Conclusions: A method that avoids the need for reference hardware and the imprecision of locating reference points on tooth surfaces, and offers simplicity in the assessment of bite registration with an intraoral scanner, was developed. These results suggest that intraoral scanners may exhibit clinically significant errors in reproducing the interocclusal relationships.

目的:关于口腔内扫描牙合定位准确性的证据很少。本研究旨在开发一种新的方法来评估口腔内扫描仪的咬合定位准确性。方法:采用两种不同类型的模型;10个石头模型和10个丙烯酸树脂牙齿。使用三维(3D)打印技术数字化设计和制造了一个三角形框架,每个顶点(一个前和两个后)都有圆柱形柱子。这样的结构被安装在每个上颌和下颌模型的舌腔中,这样,在咬合时,桩可以接触到相对的桩,在两个弓之间形成一个小的咬合间隙。这确保了牙齿之间没有干扰和完全接触。通过测量相对桩之间的距离来评估咬合准度,值越小表示精度越高。使用了三种口内扫描仪:Medit i500、Primescan和Trios 4。使用Viewbox软件测量相对立柱之间的距离,并计算横摇和俯仰。结果:牙合配准的平均最大误差超过50 μm。滚动和俯仰方向误差在0.1度以上,这意味着额外的咬合误差约为40 μm或更大。丙烯酸牙模型误差较大。结论:开发了一种方法,避免了对参考硬件的需要和在牙齿表面定位参考点的不精确性,并提供了使用口腔内扫描仪评估咬合的简单性。这些结果表明,口腔内扫描仪在再现咬合关系时可能会出现临床显著的错误。
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引用次数: 0
Zygomaticotemporal suture maturation evaluation in Chinese population using cone-beam computed tomography images. 用锥形束计算机断层成像评价中国人颧颞缝合线成熟度。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod23.020
Yifan Li, Ruomei Li, Jiajun Shi, Yuhua Shan, Zhenqi Chen

Objective: This study aimed to evaluate the zygomaticotemporal suture (ZTS) maturation, analyze the age distribution patterns of ZTS maturation stages, and investigate the relationship between ZTS and cervical vertebral maturation (CVM).

Methods: A total of 261 patients who underwent cone-beam computed tomography (112 males, mean age, 13.1 ± 3.3 years; 149 females, mean age, 13.7 ± 3.1 years) were examined to evaluate the ZTS stages. The ZTS stages were defined based on a modified method from previous studies on zygomaticomaxillary sutures. Differences between groups and correlations between indicators were analyzed using the Spearman correlation test, intraclass coefficient of correlation (ICC), one-way analysis of variance and rank sum test. Statistical significance was set at p < 0.05. The diagnostic value of CVM stages in identifying ZTS maturation stages was evaluated using positive likelihood ratios (LRs).

Results: A positive relationship was found between the ZTS and CVM stage (r = 0.747, ICC = 0.621, p < 0.01) and between the ZTS stage and chronological age (r = 0.727, ICC = 0.330, p < 0.01). Positive LRs > 10 were found for several cervical stages (CSs), including CS1 and CS2 for the diagnosis of stage B, CS1 to CS3 for the diagnosis of stages B and C, and CS6 for the diagnosis of stages D and E.

Conclusions: The ZTS maturation stage may be more relevant to the CVM stage than to the chronological age. The CVM stages can be good indicators for clinical decisions regarding maxillary protraction, except for CS4 and CS5.

目的:评价颧颞缝合线(ZTS)的成熟程度,分析ZTS成熟阶段的年龄分布规律,探讨ZTS与颈椎成熟(CVM)的关系。方法:共261例患者行锥形束计算机断层扫描(男性112例,平均年龄13.1±3.3岁;对149名女性(平均年龄13.7±3.1岁)进行ZTS分期评估。ZTS分期的定义是基于一种改进的方法,从以前的研究颧腋缝合。采用Spearman相关检验、类内相关系数(intraclass coefficient of correlation, ICC)、单因素方差分析和秩和检验分析组间差异和指标间相关性。p < 0.05为差异有统计学意义。采用阳性似然比(LRs)评价CVM分期对ZTS成熟分期的诊断价值。结果:ZTS与CVM分期呈正相关(r = 0.747, ICC = 0.621, p < 0.01), ZTS分期与实足年龄呈正相关(r = 0.727, ICC = 0.330, p < 0.01)。多个宫颈分期(CSs) LRs > 10,包括诊断B期的CS1 ~ CS2,诊断B期和C期的CS1 ~ CS3,诊断D期和e期的CS6。结论:ZTS成熟阶段可能与CVM分期的相关性大于实足年龄。除CS4和CS5外,CVM分期可以作为临床判断上颌前伸的良好指标。
{"title":"Zygomaticotemporal suture maturation evaluation in Chinese population using cone-beam computed tomography images.","authors":"Yifan Li,&nbsp;Ruomei Li,&nbsp;Jiajun Shi,&nbsp;Yuhua Shan,&nbsp;Zhenqi Chen","doi":"10.4041/kjod23.020","DOIUrl":"https://doi.org/10.4041/kjod23.020","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to evaluate the zygomaticotemporal suture (ZTS) maturation, analyze the age distribution patterns of ZTS maturation stages, and investigate the relationship between ZTS and cervical vertebral maturation (CVM).</p><p><strong>Methods: </strong>A total of 261 patients who underwent cone-beam computed tomography (112 males, mean age, 13.1 ± 3.3 years; 149 females, mean age, 13.7 ± 3.1 years) were examined to evaluate the ZTS stages. The ZTS stages were defined based on a modified method from previous studies on zygomaticomaxillary sutures. Differences between groups and correlations between indicators were analyzed using the Spearman correlation test, intraclass coefficient of correlation (ICC), one-way analysis of variance and rank sum test. Statistical significance was set at <i>p</i> < 0.05. The diagnostic value of CVM stages in identifying ZTS maturation stages was evaluated using positive likelihood ratios (LRs).</p><p><strong>Results: </strong>A positive relationship was found between the ZTS and CVM stage (r = 0.747, ICC = 0.621, <i>p</i> < 0.01) and between the ZTS stage and chronological age (r = 0.727, ICC = 0.330, <i>p</i> < 0.01). Positive LRs > 10 were found for several cervical stages (CSs), including CS1 and CS2 for the diagnosis of stage B, CS1 to CS3 for the diagnosis of stages B and C, and CS6 for the diagnosis of stages D and E.</p><p><strong>Conclusions: </strong>The ZTS maturation stage may be more relevant to the CVM stage than to the chronological age. The CVM stages can be good indicators for clinical decisions regarding maxillary protraction, except for CS4 and CS5.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 4","pages":"232-240"},"PeriodicalIF":1.9,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/d0/4c/kjod-53-4-232.PMC10387427.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10293154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Skeletal and dentoalveolar effects of different types of microimplant-assisted rapid palatal expansion. 不同类型微种植体辅助腭快速扩张对骨骼和牙槽的影响。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod23.036
Hyeong-Yoon Choi, Sang-Min Lee, Jin-Woo Lee, Dong-Hwa Chung, Mo-Hyeon Lee

Objective: To evaluate the following null hypothesis: the skeletal and dentoalveolar expansion patterns in the coronal and axial planes are not different with two different types of microimplant-assisted rapid palatal expansion (MARPE) systems.

Methods: Pretreatment (T0) and post-MARPE (T1) cone-beam computed tomography (CBCT) images of 32 patients (14 males and 18 females; mean age, 19.37) were analyzed. We compared two different MARPE systems. One MARPE system included the maxillary first premolars, maxillary first molars, and four microimplants as anchors (U46 type, n = 16), while the other included only the maxillary first molars and microimplants as anchors (U6 type, n = 16).

Results: In the molar region of the U6 and U46 groups, the transverse expansion at the midnasal, basal, alveolar, and dental levels was 2.64, 3.52, 4.46, and 6.32 mm and 2.17, 2.56, 2.73, and 5.71 mm, respectively. A significant difference was observed in the posterior alveolar-level expansion (p = 0.036) and posterior basal-bone-level expansion (p = 0.043) between the groups, with greater posterior skeletal and alveolar expansion in the U6 group.

Conclusions: Compared with the U46 group, the U6 group showed greater posterior expansion at the alveolar and basal-bone levels, with an almost parallel split. Both groups showed a pyramidal expansion pattern in the coronal view.

目的:验证两种不同类型的微种植体辅助腭快速扩张(MARPE)系统在冠状面和轴向面的骨骼和牙槽骨扩张模式没有差异的零假设。方法:对32例患者(男14例,女18例)进行预处理(T0)和marpe后(T1) ct扫描(CBCT);平均年龄19.37岁)。我们比较了两种不同的MARPE系统。一种MARPE系统包括上颌第一前磨牙、上颌第一磨牙和4颗微种植体作为锚定体(U46型,n = 16),另一种MARPE系统仅包括上颌第一磨牙和微种植体作为锚定体(U6型,n = 16)。结果:U6组和U46组磨牙区在鼻中、基牙、牙槽和牙面水平的横向扩张分别为2.64、3.52、4.46、6.32 mm和2.17、2.56、2.73、5.71 mm。两组间后牙槽水平扩张(p = 0.036)和后基底骨水平扩张(p = 0.043)差异有统计学意义,U6组后骨和牙槽水平扩张较大。结论:与U46组相比,U6组在牙槽骨和基底骨水平表现出更大的后部扩张,几乎平行裂开。两组冠状面均呈锥体状扩张。
{"title":"Skeletal and dentoalveolar effects of different types of microimplant-assisted rapid palatal expansion.","authors":"Hyeong-Yoon Choi,&nbsp;Sang-Min Lee,&nbsp;Jin-Woo Lee,&nbsp;Dong-Hwa Chung,&nbsp;Mo-Hyeon Lee","doi":"10.4041/kjod23.036","DOIUrl":"https://doi.org/10.4041/kjod23.036","url":null,"abstract":"<p><strong>Objective: </strong>To evaluate the following null hypothesis: the skeletal and dentoalveolar expansion patterns in the coronal and axial planes are not different with two different types of microimplant-assisted rapid palatal expansion (MARPE) systems.</p><p><strong>Methods: </strong>Pretreatment (T0) and post-MARPE (T1) cone-beam computed tomography (CBCT) images of 32 patients (14 males and 18 females; mean age, 19.37) were analyzed. We compared two different MARPE systems. One MARPE system included the maxillary first premolars, maxillary first molars, and four microimplants as anchors (U46 type, n = 16), while the other included only the maxillary first molars and microimplants as anchors (U6 type, n = 16).</p><p><strong>Results: </strong>In the molar region of the U6 and U46 groups, the transverse expansion at the midnasal, basal, alveolar, and dental levels was 2.64, 3.52, 4.46, and 6.32 mm and 2.17, 2.56, 2.73, and 5.71 mm, respectively. A significant difference was observed in the posterior alveolar-level expansion (<i>p</i> = 0.036) and posterior basal-bone-level expansion (<i>p</i> = 0.043) between the groups, with greater posterior skeletal and alveolar expansion in the U6 group.</p><p><strong>Conclusions: </strong>Compared with the U46 group, the U6 group showed greater posterior expansion at the alveolar and basal-bone levels, with an almost parallel split. Both groups showed a pyramidal expansion pattern in the coronal view.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 4","pages":"241-253"},"PeriodicalIF":1.9,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/e8/0f/kjod-53-4-241.PMC10387429.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9917597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
READER'S FORUM. 读者的论坛。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod23.068RF
Sung-Hun Lim
Q1. In the present study, the authors used a 2-mm asymmetric setback to group symmetric and asymmetric setback groups. The asymmetric setback is typically necessary when the mandibular asymmetry is yaw-dominant type, but not in cases of roll-dominant or translation-dominant asymmetries. Therefore, some roll and translation asymmetries may have been present in the symmetry group, resulting in different types of bony interferences during surgery and ultimately contributing to mandibular width widening. What were the causes for the widening of mandibular width in the symmetry group?
{"title":"READER'S FORUM.","authors":"Sung-Hun Lim","doi":"10.4041/kjod23.068RF","DOIUrl":"https://doi.org/10.4041/kjod23.068RF","url":null,"abstract":"Q1. In the present study, the authors used a 2-mm asymmetric setback to group symmetric and asymmetric setback groups. The asymmetric setback is typically necessary when the mandibular asymmetry is yaw-dominant type, but not in cases of roll-dominant or translation-dominant asymmetries. Therefore, some roll and translation asymmetries may have been present in the symmetry group, resulting in different types of bony interferences during surgery and ultimately contributing to mandibular width widening. What were the causes for the widening of mandibular width in the symmetry group?","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 4","pages":"217-218"},"PeriodicalIF":1.9,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/59/bc/kjod-53-4-217.PMC10387430.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9918916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Maxillary alveolar bone evaluation following dentoalveolar expansion with clear aligners in adults: A cone-beam computed tomography study. 成人牙槽骨扩张后清晰对准器对上颌牙槽骨的评价:锥束计算机断层扫描研究。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-07-25 DOI: 10.4041/kjod22.243
Marcio Antonio de Figueiredo, Fábio Lourenço Romano, Murilo Fernando Neuppmann Feres, Maria Bernadete Sasso Stuani, José Tarcísio Lima Ferreira, Ana Carla Raphaelli Nahás, Mírian Aiko Nakane Matsumoto

Objective: To investigate the effects of maxillary orthodontic expansion on the alveolar bone tissue in adult patients treated with aligners by using cone-beam computed tomography.

Methods: Thirty patients (22 females and 8 males; mean age: 36.3 years) were treated with Invisalign® aligners. Cone-beam computed tomography and digital models were obtained before (T0) and after (T1) upper arch expansion. The bone thicknesses in the cervical, middle, and apical areas of the incisors, canines, premolar, and first molars were buccally and palatally measured, totaling 96 areas and 2,880 measurements. The buccolingual inclinations and transverse measurements of the teeth were obtained from digital models to correlate them with the bone changes. The statistical tests used were Student's t-test, analysis of variance, and Pearson's correlation tests (p < 0.05).

Results: From the 96 areas evaluated, 84 revealed an increase or stability in the alveolar bone thickness and twelve displayed significant bone loss. Bone changes did not correlate with the tooth inclination and transverse measurements.

Conclusions: Within the limitation of the present study, mild levels of upper arch expansion obtained with Invisalign® aligners in adult patients did not result in any clinically significant loss of alveolar bone thickness.

目的:应用锥形束计算机断层技术,探讨上颌正畸扩展对矫治器治疗的成人患者牙槽骨组织的影响。方法:30例患者,其中女性22例,男性8例;平均年龄:36.3岁),接受Invisalign®矫正器治疗。上弓扩张前(T0)和后(T1)分别获得锥束计算机断层扫描和数字模型。对切牙、犬齿、前磨牙、第一磨牙的颈、中、尖区骨厚度进行颊部和腭部测量,共96个区域,2880个测量值。从数字模型中获得牙齿的颊舌倾斜度和横向测量值,以将它们与骨骼变化相关联。统计学检验采用学生t检验、方差分析和Pearson相关检验(p < 0.05)。结果:在96个区域中,84个区域显示牙槽骨厚度增加或稳定,12个区域显示明显的骨质流失。骨变化与牙齿倾斜度和横向测量值无关。结论:在本研究的限制范围内,成人患者使用Invisalign®矫正器获得的轻度上弓扩张不会导致任何临床意义上的牙槽骨厚度损失。
{"title":"Maxillary alveolar bone evaluation following dentoalveolar expansion with clear aligners in adults: A cone-beam computed tomography study.","authors":"Marcio Antonio de Figueiredo,&nbsp;Fábio Lourenço Romano,&nbsp;Murilo Fernando Neuppmann Feres,&nbsp;Maria Bernadete Sasso Stuani,&nbsp;José Tarcísio Lima Ferreira,&nbsp;Ana Carla Raphaelli Nahás,&nbsp;Mírian Aiko Nakane Matsumoto","doi":"10.4041/kjod22.243","DOIUrl":"https://doi.org/10.4041/kjod22.243","url":null,"abstract":"<p><strong>Objective: </strong>To investigate the effects of maxillary orthodontic expansion on the alveolar bone tissue in adult patients treated with aligners by using cone-beam computed tomography.</p><p><strong>Methods: </strong>Thirty patients (22 females and 8 males; mean age: 36.3 years) were treated with Invisalign<sup>®</sup> aligners. Cone-beam computed tomography and digital models were obtained before (T0) and after (T1) upper arch expansion. The bone thicknesses in the cervical, middle, and apical areas of the incisors, canines, premolar, and first molars were buccally and palatally measured, totaling 96 areas and 2,880 measurements. The buccolingual inclinations and transverse measurements of the teeth were obtained from digital models to correlate them with the bone changes. The statistical tests used were Student's <i>t</i>-test, analysis of variance, and Pearson's correlation tests (<i>p</i> < 0.05).</p><p><strong>Results: </strong>From the 96 areas evaluated, 84 revealed an increase or stability in the alveolar bone thickness and twelve displayed significant bone loss. Bone changes did not correlate with the tooth inclination and transverse measurements.</p><p><strong>Conclusions: </strong>Within the limitation of the present study, mild levels of upper arch expansion obtained with Invisalign<sup>®</sup> aligners in adult patients did not result in any clinically significant loss of alveolar bone thickness.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 4","pages":"264-275"},"PeriodicalIF":1.9,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/b1/f5/kjod-53-4-264.PMC10387425.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9921500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
READER'S FORUM. 读者的论坛。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-05-25 DOI: 10.4041/kjod23.011RF
Ji-Min Lee
Q1. In the discussion, the authors suggested that LLLT induced greater expansion, reduced the relapse, kept the maxilla in its forward position, and induced a more parallel sutural opening. However, in the conclusion, the authors concluded that LLLT did not clinically affect the efficiency and the outcome of the expansion. Since the points do not match with each other, I would like to ask the authors’ final opinion about the application of LLLT for non-surgical maxillary expansion.
{"title":"READER'S FORUM.","authors":"Ji-Min Lee","doi":"10.4041/kjod23.011RF","DOIUrl":"https://doi.org/10.4041/kjod23.011RF","url":null,"abstract":"Q1. In the discussion, the authors suggested that LLLT induced greater expansion, reduced the relapse, kept the maxilla in its forward position, and induced a more parallel sutural opening. However, in the conclusion, the authors concluded that LLLT did not clinically affect the efficiency and the outcome of the expansion. Since the points do not match with each other, I would like to ask the authors’ final opinion about the application of LLLT for non-surgical maxillary expansion.","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"137-138"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a1/8e/kjod-53-3-137.PMC10212773.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9880011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Micro-computed tomography evaluation of the effects of orthodontic force on immature maxillary first molars and alveolar bone mineral density of Sprague-Dawley rats. 正畸力对Sprague-Dawley大鼠未成熟上颌第一磨牙和牙槽骨矿物质密度影响的显微计算机断层评价。
IF 1.9 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Pub Date : 2023-05-25 DOI: 10.4041/kjod22.209
Jingwei Wang, Ruofang Zhang, Zhuoying Zhang, Chao Geng, Yanpeng Zhang

Objective: To investigate changes in the immature teeth of Sprague-Dawley rats during orthodontic treatment and to explore the changes in the peri-radicular alveolar bone through micro-computed tomography (CT).

Methods: Twenty-five 26-day-old male Sprague-Dawley rats were included. The maxillary left first molar was moved mesially under a continuous force of 30 cN, and the right first molar served as the control. After orthodontic treatment for 7, 14, 21, 28, and 42 days, the root length, tooth volume, and alveolar bone mineral density (BMD) around the mesial root were measured through micro-CT.

Results: The immature teeth continued to elongate after application of orthodontic force. The root length on the force side was significantly smaller than that on the control side, whereas the differences in the volume change between both sides were not statistically significant. Alveolar bone in the coronal part of the compression and tension sides showed no difference in BMD between the experimental and control groups. The BMD of the experimental group decreased from day 14 to day 42 in the apical part of the compression side and increased from day 7 to day 42 in the apical part of the tension side. The BMD of the experimental group decreased in the root apex part on day 7.

Conclusions: The root length and volume of immature teeth showed continued development under orthodontic forces. Alveolar bone resorption was observed on the compression side, and bone formation was observed on the tension side.

目的:观察Sprague-Dawley大鼠未成熟牙在正畸治疗过程中的变化,并通过显微计算机断层扫描(CT)探讨根周牙槽骨的变化。方法:选取25只26日龄雄性sd大鼠。上颌左第一磨牙在30 cN的连续力作用下向中移动,右第一磨牙作为对照。正畸治疗7、14、21、28、42 d后,通过micro-CT测量根长、牙体积、近中根周围牙槽骨矿物质密度(BMD)。结果:应用正畸力后未成熟牙继续伸长。受力侧根长明显小于对照侧根长,而两侧根体积变化差异无统计学意义。受压侧和受压侧冠状部的牙槽骨BMD在实验组和对照组之间没有差异。实验组的骨密度从第14天到第42天呈下降趋势,从第7天到第42天呈上升趋势。第7天,试验组骨密度在根尖部位下降。结论:在正畸力作用下,未成熟牙的牙根长度和体积呈持续发育的趋势。受压侧观察到牙槽骨吸收,受压侧观察到骨形成。
{"title":"Micro-computed tomography evaluation of the effects of orthodontic force on immature maxillary first molars and alveolar bone mineral density of Sprague-Dawley rats.","authors":"Jingwei Wang,&nbsp;Ruofang Zhang,&nbsp;Zhuoying Zhang,&nbsp;Chao Geng,&nbsp;Yanpeng Zhang","doi":"10.4041/kjod22.209","DOIUrl":"https://doi.org/10.4041/kjod22.209","url":null,"abstract":"<p><strong>Objective: </strong>To investigate changes in the immature teeth of Sprague-Dawley rats during orthodontic treatment and to explore the changes in the peri-radicular alveolar bone through micro-computed tomography (CT).</p><p><strong>Methods: </strong>Twenty-five 26-day-old male Sprague-Dawley rats were included. The maxillary left first molar was moved mesially under a continuous force of 30 cN, and the right first molar served as the control. After orthodontic treatment for 7, 14, 21, 28, and 42 days, the root length, tooth volume, and alveolar bone mineral density (BMD) around the mesial root were measured through micro-CT.</p><p><strong>Results: </strong>The immature teeth continued to elongate after application of orthodontic force. The root length on the force side was significantly smaller than that on the control side, whereas the differences in the volume change between both sides were not statistically significant. Alveolar bone in the coronal part of the compression and tension sides showed no difference in BMD between the experimental and control groups. The BMD of the experimental group decreased from day 14 to day 42 in the apical part of the compression side and increased from day 7 to day 42 in the apical part of the tension side. The BMD of the experimental group decreased in the root apex part on day 7.</p><p><strong>Conclusions: </strong>The root length and volume of immature teeth showed continued development under orthodontic forces. Alveolar bone resorption was observed on the compression side, and bone formation was observed on the tension side.</p>","PeriodicalId":51260,"journal":{"name":"Korean Journal of Orthodontics","volume":"53 3","pages":"205-216"},"PeriodicalIF":1.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/0a/c0/kjod-53-3-205.PMC10212771.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9880013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Korean Journal of Orthodontics
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