Progress in Orthodontics最新文献

{"title":"Correlation between dental arch form and OSA severity in adult patients: an observational study.","authors":"Domenico Ciavarella,&nbsp;Alessandra Campobasso,&nbsp;Elisa Conte,&nbsp;Giuseppe Burlon,&nbsp;Laura Guida,&nbsp;Graziano Montaruli,&nbsp;Michele Cassano,&nbsp;Michele Laurenziello,&nbsp;Gaetano Illuzzi,&nbsp;Michele Tepedino","doi":"10.1186/s40510-023-00464-5","DOIUrl":"https://doi.org/10.1186/s40510-023-00464-5","url":null,"abstract":"<p><strong>Background: </strong>The role of interdental widths and palatal morphology on the development of obstructive sleep apnea (OSA) has not been well investigated in adult patients yet. The aim of this paper was to assess the morphology of maxilla and mandibular dental arches on three-dimensional (3D) casts and to correlate these measurements with the severity of OSA.</p><p><strong>Methods: </strong>Sixty-four patients (8 women and 56 men, mean age 52.4) with a diagnosis of mild-to-moderate OSA were retrospectively enrolled. On each patient, home sleep apnea test and 3D dental models were collected. Apnea-hypopnea index (AHI) and oxygen desaturation index (ODI) were recorded, as well as the dental measurements including inter-molar distance, anterior and posterior widths of maxillary and mandibular arches, upper and lower arch lengths, palatal height, and palatal surface area. The respiratory and dental variables were then correlated.</p><p><strong>Result: </strong>A statistically inverse correlation was found between ODI and anterior width of lower arch, maxillary arch length, palatal height, and palatal area. AHI showed a significant inverse correlation with anterior width of mandibular arch and maxillary length.</p><p><strong>Conclusion: </strong>A significant inverse correlation between maxillary and mandibular morphology and respiratory parameters was shown in the present paper.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"19"},"PeriodicalIF":4.8,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10225445/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9545158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of maxillary molar distalization with clear aligner: a 4D finite-element study with staging simulation.","authors":"Bochun Mao,&nbsp;Yajing Tian,&nbsp;Yujia Xiao,&nbsp;Jing Li,&nbsp;Yanheng Zhou","doi":"10.1186/s40510-023-00468-1","DOIUrl":"https://doi.org/10.1186/s40510-023-00468-1","url":null,"abstract":"<p><strong>Introduction: </strong>Long-term simulation of tooth movement is crucial for clear aligner (CA) treatment. This study aimed to investigate the effect of maxillary molar distalization with CA via an automatic staging simulation.</p><p><strong>Method: </strong>A finite-element method (FEM) model of maxillary dentition, periodontal ligaments, attachments, and corresponding CA was established, and a prescribed 2-mm distalization with 0.1 mm each step of the second molar was simulated. The long-term tooth movement under orthodontic force was simulated with an iterative computation method. The morphologic changes of CA during staging were simulated with the thermal expansion method.</p><p><strong>Results: </strong>Twenty steps of molar distalization were simulated. Significant distal tilting of the second molar was revealed, along with the proclination of anterior teeth, which caused the 'reversed bow effect'. For the second molar, 4.63°distal tilting at the 20th step was revealed. The intrusion of the incisors and the second molar were 0.43 mm, 0.39 mm, and 0.45 mm, respectively, at step 20. All the anterior teeth showed a proclination of approximately 1.41°-2.01° at the 20th step. The expression rate of the designed distalization of the second molar was relatively low (approximately 68%) compared to the high efficacy of interdental space opening between molars with CA (approximately 89%).</p><p><strong>Conclusion: </strong>A novel method of simulating long-term molar distalization with CA with FEM was developed. The FEM results suggested distal tilting of the second molar and the proclination of anterior teeth during the molar distalization.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"16"},"PeriodicalIF":4.8,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10183381/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9828657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spontaneous changes in mandibular incisor crowding from mixed to permanent dentition: a systematic review.","authors":"Cibelle Cristina Oliveira Dos Santos,&nbsp;Renata Travassos da Rosa Moreira Bastos,&nbsp;Silvio Augusto Bellini-Pereira,&nbsp;Daniela Garib,&nbsp;David Normando","doi":"10.1186/s40510-023-00466-3","DOIUrl":"https://doi.org/10.1186/s40510-023-00466-3","url":null,"abstract":"<p><strong>Introduction: </strong>Dental crowding is the most prevalent malocclusion in the mixed and permanent detitions and can have a major impact on dentofacial esthetics. However, adjustments to the development and growth of the dentition can potentiate self-correction of dental crowding during childhood.</p><p><strong>Objective: </strong>To evaluate the physiological behavior of mandibular incisor crowding in the transition from mixed to permanent dentition.</p><p><strong>Methodology: </strong>Five electronic databases (PubMed, Scopus, Web of Science, LILACS and LIVIVO) and part of the gray literature (Proquest and Google Scholar) were investigated, based on the eligibility criteria associated with the acronym PECO, until June 2022. The risk of bias was assessed using the ROBINS-E tool and the certainty of evidence, the GRADE tool.</p><p><strong>Results: </strong>Among the 2.663 studies identified, five were selected for qualitative analysis, of which one have a low risk of bias, and four, a moderate risk. A total of 243 patients were evaluated. Evidence with a high level of certainty was generated indicating a tendency for improvement in mandibular incisor crowding from mixed to permanent dentition, with mandibular incisor crowding decreasing from 0.17 to 4.62 mm on average. The mandibular incisor crowding reduction seems to be associated with the amount of initial crowding and spontaneous dental arch dimensional changes that occur in the mixed dentition and culminate in the increase in arch perimeter, leeway space, incisor protrusion and transverse growth of the maxillary and mandibular arch.</p><p><strong>Conclusion: </strong>Based on moderate scientific evidence, spontaneous longitudinal changes in dental arch in the transition from the mixed to the permanent dentition demonstrate a spontaneous improvement in mandibular incisor crowding by up to 4.62 mm. These evidence provide a scientific basis for planning only longitudinal follow-up in patients with mild to borderline moderate mandibular incisor crowding in the mixed dentition avoiding overtreatment.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"15"},"PeriodicalIF":4.8,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10164666/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9807620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accurate gingival segmentation from 3D images with artificial intelligence: an animal pilot study.","authors":"Min Yang,&nbsp;Chenshuang Li,&nbsp;Wen Yang,&nbsp;Chider Chen,&nbsp;Chun-Hsi Chung,&nbsp;Nipul Tanna,&nbsp;Zhong Zheng","doi":"10.1186/s40510-023-00465-4","DOIUrl":"https://doi.org/10.1186/s40510-023-00465-4","url":null,"abstract":"<p><strong>Background: </strong>Gingival phenotype plays an important role in dental diagnosis and treatment planning. Traditionally, determining the gingival phenotype is done by manual probing of the gingival soft tissues, an invasive and time-consuming procedure. This study aims to evaluate the feasibility and accuracy of an alternatively novel, non-invasive technology based on the precise 3-dimension (3D) soft tissue reconstruction from intraoral scanning and cone beam computed tomography (CBCT) to predict the gingival biotype.</p><p><strong>Methods: </strong>As a proof-of-concept, Yorkshire pig mandibles were scanned, and the CBCT data were fed into a deep-learning model to reconstruct the teeth and surrounding bone structure in 3D. By overlaying the CBCT scan with the intraoral scans, an accurate superposition was created and used for virtual measurements of the soft tissue thickness. Meanwhile, gingival thicknesses were also measured by a periodontal probe and digital caliper on the buccal and lingual sides at 3 mm apical to the gingival margin of the posterior teeth and compared with the virtual assessment at the same location. The data obtained from virtual and clinical measurements were compared by Wilcoxon matched-pairs signed-rank analysis, while their correlation was determined by Pearson's r value. The Mann-Whitney U test was used for intergroup comparisons of the amount of difference.</p><p><strong>Results: </strong>Among 108 investigated locations, the clinical and virtual measurements are strongly positively correlated (r = 0.9656, P < 0.0001), and only clinically insignificant differences (0.066 ± 0.223 mm) were observed between the two assessments. There is no difference in the agreement between the virtual and clinical measurements on sexually matured samples (0.087 ± 0.240 mm) and pre-pubertal samples (0.033 ± 0.195 mm). Noticeably, there is a greater agreement between the virtual and clinical measurements at the buccal sites (0.019 ± 0.233 mm) than at the lingual sites (0.116 ± 0.215 mm).</p><p><strong>Conclusion: </strong>In summary, the artificial intelligence-based virtual measurement proposed in this work provides an innovative technique potentially for accurately measuring soft tissue thickness using clinical routine 3D imaging systems, which will aid clinicians in generating a more comprehensive diagnosis with less invasive procedures and, in turn, optimize the treatment plans with more predictable outcomes.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"14"},"PeriodicalIF":4.8,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10149545/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9398486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accumulated biomechanical effects of mandibular molar mesialization using clear aligners with auxiliary devices: an iterative finite element analysis.","authors":"Xinwei Lyu,&nbsp;Xing Cao,&nbsp;Luxian Chen,&nbsp;Yuyao Liu,&nbsp;Huilin Li,&nbsp;Cheng Hu,&nbsp;Jiali Tan","doi":"10.1186/s40510-023-00462-7","DOIUrl":"https://doi.org/10.1186/s40510-023-00462-7","url":null,"abstract":"<p><strong>Background: </strong>The biomechanics generated by the clear aligner (CA) material changes continuously during orthodontic tooth movement, but this factor remains unknown during the computer-aid design process and the predictability of molars movement is not as expected. Therefore, the purpose of this study was to propose an iterative finite element method to simulate the long-term biomechanical effects of mandibular molar mesialization (MM) in CA therapy under dual-mechanical systems.</p><p><strong>Methods: </strong>Three groups including CA alone, CA with a button, and CA with a modified lever arm (MLA) were created. Material properties of CA were obtained by in vitro mechanical experiments. MM was conducted by the rebound force exerted by CA material and the mesial elastic force (2N, 30° to the occlusal plane) applied to the auxiliary devices. Stress intensity and distribution on periodontal ligament (PDL), attachment, button and MLA, and displacement of the second molar (M2) during the iterations were recorded.</p><p><strong>Results: </strong>There was a significant difference between the initial and cumulative long-term displacement. Specifically, compared to the beginning, the maximum stress of PDL decreased by 90% on average in the intermediate and final steps. The aligner was the main mechanical system at first, and then, the additional system exerted by the button and MLA dominated gradually. The stress of attachments and auxiliary devices is mainly concentrated on their interfaces with the tooth. Additionally, MLA provided a distal tipping and extrusive moment, which was the only group that manifested a total mesial displacement of the root.</p><p><strong>Conclusions: </strong>The innovatively designed MLA was more effective in reducing undesigned mesial tipping and rotation of M2 than the traditional button and CA alone, which provided a therapeutic method for MM. The proposed iterative method simulated tooth movement by considering the mechanical characteristic of CA and its long-term mechanical force changes, which will facilitate better movement prediction and minimize the failure rate.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"13"},"PeriodicalIF":4.8,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10083150/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9651927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness of clear aligners in achieving proclination and intrusion of incisors among Class II division 2 patients: a multivariate analysis.","authors":"Xinyu Yan, Xiaoqi Zhang, Linghuan Ren, Yi Yang, Qingxuan Wang, Yanzi Gao, Qingsong Jiang, Fan Jian, Hu Long, Wenli Lai","doi":"10.1186/s40510-023-00463-6","DOIUrl":"10.1186/s40510-023-00463-6","url":null,"abstract":"<p><strong>Background: </strong>The predictability of incisor movement achieved by clear aligners among Class II division 2 patients is poorly understood. The aim of this retrospective study was to determine the effectiveness of clear aligners in proclining and intruding upper incisors and its influencing factors.</p><p><strong>Methods: </strong>Eligible patients with Class II division 2 malocclusion were included. For clear aligner therapy, three types of incisor movements were designed: proclination, intrusion and labial movement. Pre-treatment and post-treatment dental models were superimposed. The differences between predicted and actual (DPA) tooth movement of incisors were analyzed. Univariate and multivariate linear regression were used to analyze the potential influencing factors.</p><p><strong>Results: </strong>A total of 51 patients and their 173 upper incisors were included. Actual incisor proclination and intrusion were less than predicted ones (both P < 0.001), while actual labial movement was greater than predicted one (P < 0.001). Predictability of incisor proclination and intrusion was 69.8% and 53.3%, respectively. Multivariate linear regression revealed that DPA of proclination was significantly positively associated with predicted proclination (B = 0.174, P < 0.001), ipsilateral premolar extraction (B = 2.773, P < 0.001) and ipsilateral canine proclination (B = 1.811, P < 0.05), while negatively associated with molar distalization (B = - 2.085, P < 0.05). The DPA of intrusion was significantly positively correlated with predicted intrusion (B = 0.556, P < 0.001) while negatively associated with labial mini-implants (B = - 1.466, P < 0.001). The DPA of labial movement was significantly positively associated with predicted labial movement (B = 0.481, P < 0.001), while negatively correlated with molar distalization (B = - 1.004, P < 0.001), labial mini-implants (B = - 0.738, P < 0.001) and age (B = - 0.486, P < 0.05).</p><p><strong>Conclusions: </strong>For Class II division 2 patients, predicted incisor proclination (69.8%) and intrusion (53.3%) are partially achieved with clear aligner therapy. Excessive labial movement (0.7 mm) of incisors may be achieved. Incisor movement is influenced by predicted movement amount, premolar extraction, canine proclination, molar distalization, mini-implants and age.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"12"},"PeriodicalIF":4.8,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10068686/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9253173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The transparency of reporting 'harms' encountered with the surgically assisted acceleration of orthodontic tooth movement in the published randomized controlled trials: a meta-epidemiological study.","authors":"Doa'a Tahseen Alfailany, Mohammad Younis Hajeer, Khaldoun Darwich","doi":"10.1186/s40510-023-00457-4","DOIUrl":"10.1186/s40510-023-00457-4","url":null,"abstract":"<p><strong>Background: </strong>Surgical-assisted accelerated orthodontics (SAAO) has become very popular recently. Therefore, this study aimed to investigate the extent to which researchers adhere to Item 19 (harms) of the Consolidated Standards of Reporting Trials (CONSORT) in the published studies in the field of SAAO. In addition, the study evaluated the possible association between harm reporting and the human development index (HDI) of the recruited research sample country, CiteScore-based quartile (CSBQ) of the publishing journal, invasiveness of the surgical intervention (ISI), and the type of orthodontic tooth movement (TOTM). Moreover, it aimed to summarize the different possible harms and complications that maybe encountered in the course of SAAO.</p><p><strong>Materials and methods: </strong>Electronic searching of six databases was conducted for SAAO-related English RCTs published between January 2000 and April 2022. For the RCTs that did not report harms, information was sought by contacting the corresponding authors. Descriptive statistics of the evaluated variables were performed. The association between 'harm reporting' and the HDI of the research team, the BDRQ of the publication journal, the ISI, and the TOTM were investigated. Binary logistic regression was used, and the odds ratios (ORs) with 95% confidence interval (CIs) of the evaluated variables were obtained. Moreover, the risk of bias of the included RCTs was assessed using the RoB2 tool.</p><p><strong>Results: </strong>Among the 91 included RCTs, 54 RCTs (59.3%) did not adhere to reporting harm associated with the SAAO. The non-adherence was significantly associated with the ISI (OR 0.16; CI 0.03-0.73; p < 0.018) for invasive methods compared with minimally invasive ones). There was a significant positive correlation between harm reporting and both the CSBQ of the publishing journal and the HDI of the recruited research sample country (p = 0.001, p = 0.003, respectively). On the contrary, a non-significant association was found between harm reporting and the type of OTM (p = 0.695). The incidence of harms associated with SAAO was approximately 17.5%.</p><p><strong>Limitations: </strong>Assessment was restricted to English RCTs related to SAAO.</p><p><strong>Conclusion and implications: </strong>The adherence to reporting harms in the field of SAAO was deficient. Efforts should be made by authors, peer reviewers, and editors to improve compliance with the CONSORT guidelines regarding harms reporting. Additionally, there is a wide spectrum of harms that could be associated with SAAO that the practitioner should pay attention to and alert the patient to the possibility of their occurrence.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"11"},"PeriodicalIF":4.8,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10027979/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9512723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Incisor irregularity and dental arch dimensions changes in subjects with different severity of anterior crowding: a 37-year follow-up.","authors":"Caroline Martins Gambardela-Tkacz,&nbsp;Gabriela Alcaraz,&nbsp;Paula Cotrin,&nbsp;Karina Maria Salvatore de Freitas,&nbsp;Willana Moura,&nbsp;Guilherme Janson,&nbsp;Daniela Garib,&nbsp;Marcos Roberto de Freitas","doi":"10.1186/s40510-023-00461-8","DOIUrl":"https://doi.org/10.1186/s40510-023-00461-8","url":null,"abstract":"<p><strong>Background: </strong>Occlusal stability is one of the goals of orthodontic treatment, and keeping teeth aligned in the long term is a challenge for the orthodontist. This study aimed to compare the long-term incisors irregularity and dental arches dimensions changes in subjects treated with 4 premolar extractions with different pretreatment Little's irregularity index (LII). The knowledge of long-term outcomes is evidence-based information for the prognosis of future treatments.</p><p><strong>Methods: </strong>In total, 41 treated subjects were divided into two groups according to mandibular Little irregularity value at pretreatment (mild or severe). The maxillary and mandibular LII, transversal, and longitudinal widths were assessed at pretreatment, posttreatment, and 37-year posttreatment. Chi-square and independent t tests were used for intergroup comparison.</p><p><strong>Results: </strong>The groups presented similar behavior for all stages of maxillary and mandibular arch dimensions changes. Maxillary irregularity was corrected in both groups after treatment, and the alignment was acceptable in the long term. In the mild group, the mandibular incisor irregularity returned to pretreatment values in the long term. The mandibular LII increased in the severe group but did not return to pretreatment values in the long term.</p><p><strong>Conclusions: </strong>The mild crowding group presented proportionally more relapse of mandibular incisor irregularity than the severe crowding group in the long term. Even so, the correction of mild and severe crowding with the extraction of 4 premolars showed satisfactory results in the long term, even with the presence of maturational changes and relapse.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"10"},"PeriodicalIF":4.8,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10025172/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9508754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of IPR by mechanical oscillating strips system on biological structures: a quantitative and qualitative evaluation.","authors":"Francesca Gazzani,&nbsp;Denise Bellisario,&nbsp;Laura Fazi,&nbsp;Alessia Balboni,&nbsp;Silvia Licoccia,&nbsp;Chiara Pavoni,&nbsp;Paola Cozza,&nbsp;Roberta Lione","doi":"10.1186/s40510-023-00460-9","DOIUrl":"https://doi.org/10.1186/s40510-023-00460-9","url":null,"abstract":"<p><strong>Background: </strong>To evaluate by means of profilometric analysis and scanning electronic microscope (SEM) the effects on enamel surfaces of oscillating mechanical systems for interproximal enamel reduction (IPR). Fifteen complete (Group 1) oscillating IPR sequence and 15 single metallic strips (Group 2) for active IPR phase of 0.2 mm were selected and tested on 30 freshly extracted teeth by means of tribological tests with alternative dry-sliding motion (Linear Reciprocating Tribometer, C.S.M. Instruments, Peseaux, Switzerland). Enamel surface roughness and waviness measurements were assessed by contact probe surface profiler (TalySurf CLI 2000; Taylor Hobson, Leicester, UK) and a TayMap software for the 3D analysis. Statistical analysis was performed with independent samples t-test. Significance was established at the P < .05 level. SEM analysis of enamel surfaces was conducted with a FEI Quanta 200 (Hillsboro, USA) in high vacuum at 30.00 kV. Images were acquired at 30X, 100X, and 300X of magnification.</p><p><strong>Results: </strong>Teeth undergone Group 1 showed lower values of surface roughness (Ra - 0.34 µm, Rt - 1.55 µm) and significant increase of waviness parameters (Wa 0.25 µm, Wt 4.02 µm) when compared with those treated with Group 2. SEM evaluation showed smoothers and more regular surfaces when IPR was performed by complete IPR sequence. Single metallic strip determined more irregular surfaces characterized by extended grooves, alternated with enamel ridges and irregular fragments.</p><p><strong>Conclusion: </strong>The adoption of a standardized oscillating IPR sequence determines more regular and harmonious enamel surfaces at the end of the procedure. An adequate polishing after IPR plays a crucial role to guarantee a good long-term prognosis and a good respect of biological structures.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"9"},"PeriodicalIF":4.8,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10008756/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9481031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of the effects of different rapid maxillary expansion techniques on craniofacial structures: a finite element analysis study.","authors":"Nihal Kaya,&nbsp;Elif Dilara Seker,&nbsp;Türker Yücesoy","doi":"10.1186/s40510-023-00459-2","DOIUrl":"https://doi.org/10.1186/s40510-023-00459-2","url":null,"abstract":"<p><strong>Aim: </strong>To compare the effects of three different maxillary expansion appliances with five different types of expansion modalities on stress distribution and displacement on the maxilla and its adjacent craniofacial structures using the finite element method (FEM).</p><p><strong>Materials and methods: </strong>Cone-beam computed tomography data of a patient with maxillary transverse deficiency were rendered into a three-dimensional model of craniomaxillary structures. The expansion appliances included tooth-borne, hybrid, and bone-borne expanders. Five different expansion modalities were applied to each expander [conventional Rapid Maxillary Expansion (RME) (type 1), midpalatal suture cortico-puncture-assisted RME (type 2), LeFort l cortico-puncture-assisted RME (type 3), surgically assisted RME (SARME) without pterygomaxillary junction (PMJ) separation (type 4), and SARME with bilateral PMJ separation (type 5)]. The numerical and visual data were analyzed.</p><p><strong>Results: </strong>The highest amount of stress accumulation on teeth was found in the tooth-borne and hybrid groups. On the other hand, more stress concentration on the maxilla was observed in the bone-borne group. SARME cuts with PMJ separation increased total movement by reducing the stress on the midpalatal suture in all groups. While types 1, 2, and 3 were similar in terms of the amounts of displacement, types 4 and 5 increased the total amount of displacement in all groups. The total amounts of displacements from the highest value to the lowest value for the anterior and posterior maxilla were in the bone-borne, tooth-borne, and hybrid groups.</p><p><strong>Conclusions: </strong>SARME cuts were effective in reducing stress on the teeth, but the cortico-puncture application affected neither the stress values on the teeth nor the transverse displacement in the tooth-borne expanders. Surgical procedures such as SARME and corticotomy should be used with bone-borne devices to improve the outcomes of maxillary expansion procedures.</p>","PeriodicalId":56071,"journal":{"name":"Progress in Orthodontics","volume":"24 1","pages":"7"},"PeriodicalIF":4.8,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9986190/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10859905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}