Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie最新文献

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Effect of applying intermittent force with and without vibration on orthodontic tooth movement. 在有振动和无振动的情况下施加间歇力对正畸牙齿移动的影响。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2023-09-06 DOI: 10.1007/s00056-023-00488-w
Osman Yildiz, Ahmet Yagci, Nizami Hashimli
{"title":"Effect of applying intermittent force with and without vibration on orthodontic tooth movement.","authors":"Osman Yildiz, Ahmet Yagci, Nizami Hashimli","doi":"10.1007/s00056-023-00488-w","DOIUrl":"10.1007/s00056-023-00488-w","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to determine whether orthodontic tooth movement could be accelerated by applying an intermittent force protocol. It also examined the effect of applying additional vibrational forces on orthodontic tooth movement and root resorption rates.</p><p><strong>Methods: </strong>This study included 24 patients (16 males and 8 females) who underwent orthodontic treatment involving first premolar extraction and distal movement of the canines in the maxilla. A Hycon device (Adenta GmbH, Gilching, Germany) was used for canine distalization in all patients. The patients were randomly divided into two groups: one group received 20 min of vibration per day using the AcceleDent device (OrthoAccel Technologies, Inc., Bellaire, TX, USA), while the other group received no vibration. In addition, a split-mouth design was used: an activation-only force protocol was applied on one side, and an intermittent activation-deactivation-activation (ADA) protocol was applied on the other. The duration required for complete canine tooth distalization on each side was calculated. In addition, the effect of vibration on the orthodontically induced root resorption was examined.</p><p><strong>Results: </strong>The intermittent ADA protocol significantly accelerated orthodontic tooth movement compared to the activation-only protocol (p < 0.05). The application of additional vibration did not affect the orthodontic tooth movement rate (p > 0.05).</p><p><strong>Conclusions: </strong>Using a Hycon device and following an ADA protocol provided significantly faster canine distalization than the activation-only protocol (p < 0.05). This intermittent force method proved very effective in closing the spaces. However, vibration did not significantly affect the orthodontic tooth movement rate (p > 0.05).</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10161776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Microbial contamination profile on esthetic elastomeric ligatures through the checkerboard DNA-DNA hybridization technique : A randomized split-mouth study. 通过棋盘式 DNA-DNA 杂交技术分析美容弹性结扎上的微生物污染情况:随机分口研究。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2024-01-05 DOI: 10.1007/s00056-023-00507-w
Raquel Fernanda Bachiega Morelli, Paulo Nelson-Filho, Karla Carpio Horta, Magda Feres, José Tarcísio Lima Ferreira, Fábio Lourenço Romano, Maria Bernadete Sasso Stuani, Maria Conceição Pereira Saraiva, Caio Luiz Bitencourt Reis, Mirian Aiko Nakane Matsumoto
{"title":"Microbial contamination profile on esthetic elastomeric ligatures through the checkerboard DNA-DNA hybridization technique : A randomized split-mouth study.","authors":"Raquel Fernanda Bachiega Morelli, Paulo Nelson-Filho, Karla Carpio Horta, Magda Feres, José Tarcísio Lima Ferreira, Fábio Lourenço Romano, Maria Bernadete Sasso Stuani, Maria Conceição Pereira Saraiva, Caio Luiz Bitencourt Reis, Mirian Aiko Nakane Matsumoto","doi":"10.1007/s00056-023-00507-w","DOIUrl":"10.1007/s00056-023-00507-w","url":null,"abstract":"<p><strong>Objective: </strong>The aim of this study is to assess the microbial contamination of three different brands of esthetic elastomeric ligatures.</p><p><strong>Materials and methods: </strong>Different brands of esthetic ligatures (Unistick Pearl [American Orthodontics, Sheboygan, WI, USA], Power Sticks Pearl [Ortho Technology, Tampa, FL, USA], and Ease [Obscure, 3M Unitek, Monrovia, CA, USA]) were randomly assigned to permanent canines of 25 patients (aged 11-18 years) undergoing corrective orthodontic treatment. After 30 days, the ligatures were removed, processed, and the biofilm composition was analyzed by checkerboard DNA-DNA hybridization for 40 bacterial species. The microbiological data were analyzed using a nonparametric mixed model.</p><p><strong>Results: </strong>The ligatures presented intense microbial contamination after 30 days, but no statistically significant differences were observed among the three groups (p > 0.05). The levels of the evaluated individual species and proportions of the microbial complexes showed no statistically significant differences among the ligature groups (p > 0.05).</p><p><strong>Conclusions: </strong>Esthetic elastomeric ligatures became multicolonized by several bacterial species after 30 days of exposure to the oral cavity. However, no relevant differences were observed among the biofilm composition formed on the different ligature brands.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139099155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Determination of growth and developmental stages in hand-wrist radiographs : Can fractal analysis in combination with artificial intelligence be used? 确定手-腕部 X 射线照片中的生长和发育阶段:能否结合人工智能使用分形分析法?
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2024-01-22 DOI: 10.1007/s00056-023-00510-1
Merve Gonca, Mehmet Fatih Sert, Dilara Nil Gunacar, Taha Emre Kose, Busra Beser
{"title":"Determination of growth and developmental stages in hand-wrist radiographs : Can fractal analysis in combination with artificial intelligence be used?","authors":"Merve Gonca, Mehmet Fatih Sert, Dilara Nil Gunacar, Taha Emre Kose, Busra Beser","doi":"10.1007/s00056-023-00510-1","DOIUrl":"10.1007/s00056-023-00510-1","url":null,"abstract":"<p><strong>Purpose: </strong>The goal of this work was to assess the classification of maturation stage using artificial intelligence (AI) classifiers.</p><p><strong>Methods: </strong>Hand-wrist radiographs (HWRs) from 1067 individuals aged between 7 and 18 years were included. Fifteen regions of interest were selected for fractal dimension (FD) analysis. Five predictive models with different inputs were created (model 1: only FD; model 2: FD and Chapman sesamoid stage; model 3: FD, age, and sex; model 4: FD, Chapman sesamoid stage, age, and sex; model 5: Chapman sesamoid stage, age, and sex). The target diagnoses were accelerating growth velocity, very high growth velocity, and decreasing growth velocity. Four AI algorithms were applied: multilayer perceptron (MLP), support vector machine (SVM), gradient boosting machine (GBM) and C 5.0 decision tree classifier.</p><p><strong>Results: </strong>All AI algorithms except for C 5.0 yielded similar overall predictive accuracies for the five models. In order from lowest to highest, the predictive accuracies of the models were as follows: model 1 < model 3 < model 2 < model 5 < model 4. The highest overall F1 score, which was used instead of accuracy especially for models with unbalanced data, was obtained for models 1, 2, and 3 based on SVM, for model 4 based on MLP, and for model 5 based on C 5.0. Adding Chapman sesamoid stage, chronologic age, and sex as additional inputs to the FD values significantly increased the F1 score.</p><p><strong>Conclusion: </strong>Applying FD analysis to HWRs is not sufficient to predict maturation stage in growing patients but can be considered a growth rate prediction method if combined with the Chapman sesamoid stage, age, and sex.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139514270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Association between craniofacial patterns and third molar agenesis in orthodontic patients. 正畸患者的颅面形态与第三磨牙缺失之间的关系。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2023-06-28 DOI: 10.1007/s00056-023-00484-0
Eva Paddenberg, Alice Correa Silva-Souza, Ariane Beatriz Blancato, César Penazzo Lepri, Peter Proff, Erika Calvano Küchler, Christian Kirschneck
{"title":"Association between craniofacial patterns and third molar agenesis in orthodontic patients.","authors":"Eva Paddenberg, Alice Correa Silva-Souza, Ariane Beatriz Blancato, César Penazzo Lepri, Peter Proff, Erika Calvano Küchler, Christian Kirschneck","doi":"10.1007/s00056-023-00484-0","DOIUrl":"10.1007/s00056-023-00484-0","url":null,"abstract":"<p><strong>Purpose: </strong>Third molar agenesis (TMA) is the most common craniofacial anomaly and has been associated with craniofacial patterns in different populations. Therefore, the aim of this retrospective cross-sectional study was to assess a possible association between craniofacial patterns and TMA in German orthodontic patients.</p><p><strong>Methods: </strong>Patients undergoing orthodontic treatment with dental records including anamnesis, pretreatment lateral cephalograms and orthopantomograms were evaluated. Cephalometric analyses were conducted digitally and lines, angles and proportions were measured to investigate craniofacial morphology. Skeletal classes were determined by the individualised Wits appraisal and ANB angle. The TMA was identified with the help of orthopantomograms. Patients showing agenesis of at least one third molar were included in the TMA group. Statistical analysis was performed to assess the association between TMA and craniofacial patterns (α of p ≤ 0.05).</p><p><strong>Results: </strong>A total of 148 patients were included, 40 (27.0%) presented at least one missing tooth (TMA group) and 108 (73.0%) showed full dentition (control group). Skeletal class determined by the individualised Wits appraisal revealed statistical significance between the TMA and control groups (p = 0.022), in which TMA patients were 11 times more likely to present with an individualised skeletal class III (odds ratio 11.3, 95% confidence interval 1.7-139.5). Skeletal cephalometric analysis revealed no statistical differences between TMA and control groups for any further angular, linear and proportional parameters.</p><p><strong>Conclusion: </strong>Third molar agenesis was associated with skeletal class III determined by the individualised Wits appraisal.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11371891/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9690772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Third molar angulation and retromolar space after functional orthodontic treatment : Evaluation of panoramic radiographs after monoblock or Herbst appliance. 功能性正畸治疗后的第三磨牙成角和后磨牙间隙 :单锁或赫氏矫治器矫治后的全景X光片评估。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2024-02-20 DOI: 10.1007/s00056-024-00516-3
Esra Bolat Gümüş, Elçin Esenlik, Göksu Emek Kayafoğlu, Mustafa Yıldırım
{"title":"Third molar angulation and retromolar space after functional orthodontic treatment : Evaluation of panoramic radiographs after monoblock or Herbst appliance.","authors":"Esra Bolat Gümüş, Elçin Esenlik, Göksu Emek Kayafoğlu, Mustafa Yıldırım","doi":"10.1007/s00056-024-00516-3","DOIUrl":"10.1007/s00056-024-00516-3","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this respectively cohort study was to evaluate the lower second and third molars and canine angulations, retromolar space and occlusal relationships after functional orthodontic treatments with the monoblock or Herbst appliance using panoramic radiographs.</p><p><strong>Methods: </strong>Pre- and posttreatment cephalometric and panoramic radiographs of 133 patients (mean age 13.89 ± 1.14 years) treated non-extraction with monoblock (n: 44), Herbst (n: 45) and fixed orthodontic appliances (control group; n: 44) were included to the study. Dental and skeletal measurements were performed on cephalometric radiographs. The angle between the third and second molars, and canines with the lower border of the mandible and the occlusal plane, gonial angle, the angle between the third and second molars and the retromolar space width were assessed on pre- and posttreatment panoramic radiographs. Paired and independent t tests were used for the statistical analysis of the data for intragroup and intergroup comparisons.</p><p><strong>Results: </strong>Functional treatment with both the monoblock and the Herbst appliances resulted in improvement of skeletal class II relationships. Retromolar space significantly increased in the functional appliance groups compared to the control group (p ≤ 0.001), but improvement of the angulations of posterior teeth was significant only in the monoblock group (p ≤ 0.001).</p><p><strong>Conclusion: </strong>While both the Herbst and monoblock appliances led to an increase in retromolar space, monoblock treatment resulted in more favorable angulation of the third molars compared to the Herbst treatment.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139914026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Evaluation of torsional strength and torque presentation of coated rectangular stainless steel archwires, an in vitro study. 涂层矩形不锈钢弓丝的抗扭强度和扭矩表现的评估,一项体外研究。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2023-11-01 DOI: 10.1007/s00056-023-00503-0
Parisa Salehi, Shabnam Ajami, Nazanin Berahman, Niloofar Azadeh
{"title":"Evaluation of torsional strength and torque presentation of coated rectangular stainless steel archwires, an in vitro study.","authors":"Parisa Salehi, Shabnam Ajami, Nazanin Berahman, Niloofar Azadeh","doi":"10.1007/s00056-023-00503-0","DOIUrl":"10.1007/s00056-023-00503-0","url":null,"abstract":"<p><strong>Objectives: </strong>An in vitro experimental study was performed to evaluate the torsional strength and torque released by esthetic coated archwires.</p><p><strong>Materials and methods: </strong>A total of 52 coated (study group) and 52 stainless steel (control group) rectangular archwires from two manufacturers (brand I: Gestenco International AB, Gothenburg, Sweden and brand II: Ortho Technology, Lutz, FL, USA) in two sizes (0.019 × 0.025 and 0.017 × 0.0250-inch) were evaluated. The straight parts on both ends of each preformed archwire were cut in 30 mm segments. A specially designed experimental device was attached to the universal testing machine (Model Z020, Zwick Roell, Ulm, Germany) to measure torsional strength and to calculate the clinically significant torque interval. The groups were compared based on their brand, presence of coating and size using three-way analysis of variance (ANOVA) test at a significance level of 5%.</p><p><strong>Results: </strong>The results revealed that coating of the wires of brand 1 resulted in a significant reduction of torsional strength in both wire sizes (P-value = 0.0001). For the wires of brand 2, coating of the 0.017 × 0.025-in wire resulted in a significant reduction in torsional strength. However, for the 0.019 × 0.025 in wire size, the presence of coating significantly increased the torsional strength (P-value = 0.0001). Coating did not affect the measured clinical torque interval of the analyzed wires when a torque between 5 and 20 Nmm was applied (P-value = 0.062).</p><p><strong>Conclusions: </strong>Mechanical behavior of coated archwires depends mainly on the thickness of their inner core alloy. Reduction in the diameter of the inner alloy resulted in reduced torsional strength. Despite lower mean torsional strength, in the settings of this study, coated and conventional wires demonstrated comparable torque angles if loaded in the typical range of activation.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71429266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Total mesialization of the mandibular dentition using a mini-implant-supported device : A finite element analysis. 使用微型种植体支持装置的下颌牙列的全内嵌化:有限元分析。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-08-01 Epub Date: 2023-11-14 DOI: 10.1007/s00056-023-00502-1
Xi Wang, Le Yang, Yeling Zhu, Weicai Wang, Chen Zhou, Yang Cao, Baicheng Bao, Jiazhi Li
{"title":"Total mesialization of the mandibular dentition using a mini-implant-supported device : A finite element analysis.","authors":"Xi Wang, Le Yang, Yeling Zhu, Weicai Wang, Chen Zhou, Yang Cao, Baicheng Bao, Jiazhi Li","doi":"10.1007/s00056-023-00502-1","DOIUrl":"10.1007/s00056-023-00502-1","url":null,"abstract":"<p><strong>Purpose: </strong>Total mandibular arch mesialization using mini-implants is challenging due to anatomic limitations. The aim of this study was to introduce a mini-implant-supported device for total mesialization of the mandibular dentition and to analyze the biomechanical properties of the device.</p><p><strong>Methods: </strong>Finite element models were constructed to explore the effect of friction and force direction on the force transmission efficiency of the device. In addition, the three-dimensional displacement of each tooth was evaluated with two force application points (2 or 8 mm hooks) under three force conditions (symmetric: 150 g of force on both sides, or asymmetric: 100 and 200 g of force on each side).</p><p><strong>Results: </strong>The force transmission efficiency was 66.7% under a friction coefficient of 0.15 and parallel pushing and pulling forces. The force transmission efficiency was 65.90 and 66.63% when the pushing force was 15° away from the pulling force on the sagittal and horizontal planes, respectively. The mandibular dentition moved mesially with a greater tendency for incisor labial crown tipping, mesial molar rotation and buccal second molar crown tipping when using the 8 mm hook compared to that when using the 2 mm hook. Rigid archwires resulted in more consistent tooth mesialization than stainless steel archwires. Asymmetric forces resulted in asymmetric dental arch mesialization.</p><p><strong>Conclusion: </strong>The forces transmitted by the presented mini-implant-supported device varied depending on the friction level and force direction. The device should be able to achieve symmetric or asymmetric total mesialization of the mandibular dentition.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92157351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Thermocycling and single-tooth measurements in orthodontic aligners-importance for real-life and caveat. 正畸矫治器中的热循环和单齿测量--对现实生活的重要性和注意事项。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-07-02 DOI: 10.1007/s00056-024-00540-3
Hinpetch Daungsupawong, Viroj Wiwanitkit
{"title":"Thermocycling and single-tooth measurements in orthodontic aligners-importance for real-life and caveat.","authors":"Hinpetch Daungsupawong, Viroj Wiwanitkit","doi":"10.1007/s00056-024-00540-3","DOIUrl":"https://doi.org/10.1007/s00056-024-00540-3","url":null,"abstract":"","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141494326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
In vivo assessment of artefacts in MRI images caused by conventional twistflex and various fixed orthodontic CAD/CAM retainers. 对传统扭转式矫治器和各种 CAD/CAM 固定矫治器在核磁共振成像中造成的伪影进行活体评估。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-07-01 Epub Date: 2023-01-26 DOI: 10.1007/s00056-022-00445-z
Christoph J Roser, Tim Hilgenfeld, Muhammad Abdullah Saleem, Thomas Rückschloß, Sabine Heiland, Martin Bendszus, Christopher J Lux, Alexander Juerchott
{"title":"In vivo assessment of artefacts in MRI images caused by conventional twistflex and various fixed orthodontic CAD/CAM retainers.","authors":"Christoph J Roser, Tim Hilgenfeld, Muhammad Abdullah Saleem, Thomas Rückschloß, Sabine Heiland, Martin Bendszus, Christopher J Lux, Alexander Juerchott","doi":"10.1007/s00056-022-00445-z","DOIUrl":"10.1007/s00056-022-00445-z","url":null,"abstract":"<p><strong>Purpose: </strong>To assess magnetic resonance imaging (MRI) artefacts caused by different computer-aided design/computer-aided manufacturing (CAD/CAM) retainers in comparison with conventional hand bent stainless steel twistflex retainers in vivo.</p><p><strong>Materials and methods: </strong>MRI scans (3 Tesla) were performed on a male volunteer with different CAD/CAM retainers (cobalt-chromium, CoCr; nickel-titanium, NiTi; grade 5 titanium, Ti5) and twistflex retainers inserted. A total of 126 landmarks inside and outside the retainer area (RA; from canine to canine) were evaluated by two blinded radiologists using an established five-point visibility scoring (1: excellent, 2: good, 3: moderate, 4: poor, 5: not visible). Friedman and two-tailed Wilcoxon tests were used for statistical analysis (significance level: p < 0.05).</p><p><strong>Results: </strong>Twistflex retainers had the strongest impact on the visibility of all landmarks inside (4.0 ± 1.5) and outside the RA (1.7 ± 1.2). In contrast, artefacts caused by CAD/CAM retainers were limited to the dental area inside the RA (CoCr: 2.2 ± 1.2) or did not impair MRI-based diagnostics in a clinically relevant way (NiTi: 1.0 ± 0.1; Ti5: 1.4 ± 0.6).</p><p><strong>Conclusion: </strong>The present study on a single test person demonstrates that conventional stainless steel twistflex retainers can severely impair the diagnostic value in head/neck and dental MRI. By contrast, CoCr CAD/CAM retainers can cause artefacts which only slightly impair dental MRI but not head/neck MRI, whereas NiTi and Ti5 CAD/CAM might be fully compatible with both head/neck and dental MRI.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11186891/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10610120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
A novel machine learning model for class III surgery decision. 用于 III 级手术决策的新型机器学习模型。
IF 1.3 4区 医学
Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie Pub Date : 2024-07-01 Epub Date: 2022-08-26 DOI: 10.1007/s00056-022-00421-7
Hunter Lee, Sunna Ahmad, Michael Frazier, Mehmet Murat Dundar, Hakan Turkkahraman
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