Dental Press Journal of Orthodontics最新文献

{"title":"Do the methods for cleaning the base of brackets used in indirect bonding interfere with adhesion to tooth enamel?","authors":"Carlos Eduardo de Paiva Campos Nogueira Simão, Ana Luiza Ferreira da Silva, Marcela Emílio de Araújo, Sergei Godeiro Fernandes Rabelo Caldas","doi":"10.1590/2177-6709.29.4.e242462.oar","DOIUrl":"10.1590/2177-6709.29.4.e242462.oar","url":null,"abstract":"<p><strong>Objective: </strong>The objective of this study was to evaluate the shear bond strength of metal brackets bonded with indirect bonding, under different surface treatment protocols.</p><p><strong>Material and methods: </strong>40 bovine teeth were randomly divided into four groups (n = 10), according to the type of surface treatment: G1 = 70% alcohol, G2 = air/water spray, G3 = 100-µm aluminum oxide blasting, G4 = direct boning. After drying, the standard Edgewise central incisor brackets were bonded with light-cured resin. The brackets were moved from the plaster models by means of a transfer tray made with condensation silicone, and bonded to the surface of the enamel with self-curing adhesive. The samples were submitted to shear tests by a universal test machine. Data were analyzed with SPSS 20.0 by the one-way ANOVA test and the Tukey post-test.</p><p><strong>Results: </strong>No statistically significant difference (p=0.174) was observed between the mean forces measured between the group for shear strength values of the groups during the test: G1 (5.33 MPa), G2 (3.52 MPa) and G3 (4.58 MPa).</p><p><strong>Conclusion: </strong>The bracket surface treatment protocols presented similarities in shear bond strength test. However, alcohol 70% and oxide blasting presented higher absolute values of resistance than the water group.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 4","pages":"e242462"},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11368242/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orthodontic finishing errors detected in board-approved cases: common types and prediction.","authors":"José Valladares-Neto, Lincoln Issamu Nojima, Heloísio de Rezende Leite, Matheus Melo Pithon, Adilson Luiz Ramos, Luís Antônio de Arruda Aidar, Roberto Rocha, Carlos Alberto Estavanell Tavares, Jonas Capelli-Jr, Roberto Carlos Bodart Brandão, Marcos Alan Vieira Bittencourt, Guilherme de Araújo Almeida, Mirian Aiko Nakane Matsumoto","doi":"10.1590/2177-6709.29.4.e2424102.oar","DOIUrl":"10.1590/2177-6709.29.4.e2424102.oar","url":null,"abstract":"<p><strong>Objective: </strong>To report and rank orthodontic finishing errors recorded in the clinical phase of the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) examination and correlate pretreatment case complexity with orthodontic treatment outcomes.</p><p><strong>Materials and methods: </strong>This single-center cross-sectional survey collected retrospective data from the clinical phase of BBO examinations between 2016 and 2023. The quality of orthodontic clinical outcomes of each case was assessed by means of the Cast-Radiograph Evaluation (CRE), while case complexity was evaluated using the Discrepancy Index (DI), both tools provided by the American Board of Orthodontics. Survey items were analyzed using descriptive statistics, and a correlation analysis between total CRE and DI scores (p<0.05) was also performed.</p><p><strong>Results: </strong>A total of 447 orthodontic records was included. Orthodontic finishing errors were often observed, and no case was completely perfect. In the total CRE score, an average of 15 points was discounted for each case. Most frequently found issues involved problems with alignment, buccolingual inclination, marginal ridge, and occlusal relationship. The median DI score for initial case complexity was 22.0 (range 10.0 - 67.0). There was no significant correlation between the DI and CRE scores (p=0.106).</p><p><strong>Conclusion: </strong>Orthodontic finishing errors are inevitable, even in well-finished board-approved cases. Rotation, excessive buccolingual inclination, and discrepancies in marginal ridges are the most frequently observed areas of concern, in that order. Moreover, while case complexity, determined by DI, can impact orthodontic planning and pose challenges for clinicians, the study did not consider it a determining factor in predicting treatment outcomes.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 4","pages":"e2424102"},"PeriodicalIF":0.0,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11368236/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MISMARPE protocol: minimally invasive surgical and miniscrew-assisted rapid palatal expansion.","authors":"Orion Luiz Haas Júnior, Paulo Ricardo Baccarin Matje, Bibiana Mello da Rosa, Vicente Dias Piccoli, Susana Maria Deon Rizzatto, Rogério Belle de Oliveira, Luciane Macedo de Menezes","doi":"10.1590/2177-6709.29.3.e24spe3","DOIUrl":"10.1590/2177-6709.29.3.e24spe3","url":null,"abstract":"<p><strong>Objective: </strong>The purpose of this article is to present the MISMARPE technique, a new minimally invasive surgical procedure to treat maxillary transverse atresia in adult patients under local anesthesia and on an outpatient basis.</p><p><strong>Technique description: </strong>The technique consists of miniscrew-assisted rapid palatal expansion (MARPE) associated with a minimally invasive approach using maxillary osteotomies, latency and activation periods until the desired expansion is achieved. The present MISMARPE technique was performed in 25 consecutive cases with a success rate of 96%, yielding good skeletal outcomes with minimal trauma. The expander appliances, with their anchorage types, and a description of the surgical steps of the MISMARPE technique are presented.</p><p><strong>Conclusion: </strong>MISMARPE is a new and effective alternative for less invasive treatment of maxillary transverse deficiency in adults, compared to conventional surgery. Emphasis is placed on the importance of systematic and well-established protocols, for executing the procedures safely and predictably.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e24spe3"},"PeriodicalIF":0.0,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11321491/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141976904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Miniscrew-assisted rapid palatal expansion (MARPE): Factors influencing planning.","authors":"Cristiane Barros André, Bruno de Paula Machado Pasqua, Gustavo de Andrade Jacquier, Fabio Dupart Nascimento","doi":"10.1590/2177-6709.29.3.e242439.oar","DOIUrl":"10.1590/2177-6709.29.3.e242439.oar","url":null,"abstract":"<p><strong>Objective: </strong>This cross-sectional study evaluated the bone thickness on mini-implants insertion site, the factors that influence the digital planning of MARPE appliance (miniscrew-assisted rapid palatal expansion), and its different designs.</p><p><strong>Methods: </strong>A total of 135 plannings were assessed regarding the size of the expander screw used, the positioning and the type of the mini-implant rings, and their location in relation to the teeth. Bone thickness measurements were assessed in the region of the mini-implants' trajectory. Differences between the sexes was verified using the ANOVA test (5% significance).</p><p><strong>Results: </strong>73 cases were planned with 4 mini-implants and 62 cases, with 6 mini-implants. In 90% of cases, teeth #16 and #26 were used as supports, and the most used expander screw was 13mm (64.1% of cases). The anterior mini-implants of conventional MARPE showed more pronounced insertion in bone in males (5.9 ± 2mm; p= 0.025). The extra mini-implants (anterior region) were inserted with greater bone thickness in males (11.1 ± 2.3mm) compared to females (9.9 ± 1.8mm; p=0.041). A greater bone thickness was observed in males (10.1 ± 2.1 mm) when using mini-implants in the paramedian region.</p><p><strong>Conclusion: </strong>Additional rings allow more pronounced bone insertion. Male patients had greater bone thickness, which may be related to greater difficulty in opening the sutures. The alveolar process region seems to be a satisfactory site for mini-implants to those patients with reduced bone thickness in the paramedian posterior region. MARPE appliance must be customized for each patient, due to bone thickness and anatomical variations.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e242439"},"PeriodicalIF":0.0,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11321490/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141976903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of the accuracy of two techniques for three-dimensional digital indirect bonding of orthodontic brackets: A randomized controlled trial.","authors":"Ahmed Abdelhalim Mahran, Wael Mubarak Refai, Ahmed Shawky Hashem","doi":"10.1590/2177-6709.29.3.e2423117.oar","DOIUrl":"10.1590/2177-6709.29.3.e2423117.oar","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to clinically compare the accuracy of bracket positioning between three-dimensionally (3D) printed indirect bonding trays and vacuum-formed trays made over 3D-printed models.</p><p><strong>Material and methods: </strong>Fourteen patients, planned for fixed orthodontic therapy, were randomly divided into two equal groups. For both groups, both dental arches were scanned, to acquire virtual models, brackets were virtually positioned from central incisors to second premolars, and scans for the final bracket positions were performed. In the first group, transfer trays were 3D-printed. In the second group, virtual models were 3D-printed, and vacuum-formed soft sheets were thermoformed on the printed model. Teeth were indirectly bonded and then scanned. Superimposition of the virtual and the final bracket positioning scans was performed to measure linear and angular deviations in brackets positions.</p><p><strong>Results: </strong>The first group showed significantly less occlusogingival and buccolingual linear errors than the second group. No significant differences in angular deviations were found between both groups. The frequencies of clinically acceptable linear errors within 0.5 mm and angular errors within 2° showed no statistically significant difference between both groups (p> 0.05 for all measurements). The transfer errors in both groups showed linear directional biases toward the mesial, gingival and labial directions. There was no statistically significant difference in the rate of immediate debonding between both groups (10.7% and 7.1% for the first and the second groups, respectively, p=0.295).</p><p><strong>Conclusions: </strong>3D-printed indirect bonding trays were more accurate than vacuum-formed trays, in terms of linear deviations. Both types of trays showed similar angular control.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e2423117"},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235573/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141564740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of orthodontists' attitudes and practices regarding residual resin removal methods.","authors":"Lívia Lima de Moraes Barreto, Sarah Aquino de Almeida, Fernanda Campos Machado, Robert Willer Farinazzo Vitral, Marcio José da Silva Campos","doi":"10.1590/2177-6709.29.3.e242402.oar","DOIUrl":"10.1590/2177-6709.29.3.e242402.oar","url":null,"abstract":"<p><strong>Introduction: </strong>The removal of residual resins is a routine procedure in orthodontic clinics and of great importance to the final result of the treatment.</p><p><strong>Objective: </strong>To evaluate the main methods of residual resin removal used by orthodontists, and the main reasons for choosing these methods.</p><p><strong>Methods: </strong>A questionnaire consisting of 21 questions: 6 relating to demographic data and the other 15 relating to two methods used to remove residual resins (drills or pliers) was sent by e-mail to orthodontists registered with the Regional Councils of Dentistry of São Paulo and Rio de Janeiro (Brazil) within April and June, 2023. Questionnaires were sent back by 153 professionals.</p><p><strong>Results: </strong>Residual resin removal is always carried out with high speed drill for 44.7% of the sample, and with low speed drill for 28.7%; 61.3% use irrigation. The multi-laminate carbide bur is used by 82.5% of orthodontists. Pliers are always used by 12.4%. Resin-removing pliers with Widia are used in 39% of cases. The use of high speed was justified by the shorter working time, and the choice of pliers was justified by the smaller damage to the tooth enamel.</p><p><strong>Conclusion: </strong>The most used residual resin removal method was the multi-laminate carbide bur at high speed with irrigation, justified the by shorter working time.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e242402"},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235571/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141564742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Does mandibular advancement ortho-surgical procedure cause condyle changes? A case-series analysis.","authors":"Alline Birra Nolasco Fernandes, Luíza Trindade Vilela, Taísa Figueiredo Chagas, Antônio Carlos de Oliveira Ruellas, Cláudia Trindade Mattos, Margareth Maria Gomes de Souza","doi":"10.1590/2177-6709.29.3.e2423261.oar","DOIUrl":"10.1590/2177-6709.29.3.e2423261.oar","url":null,"abstract":"<p><strong>Introduction: </strong>Mandibular advancement surgery corrects bone bases while establishing patients' functional and aesthetic rehabilitation. However, little is known about the results of this procedure in the structures that make up the stomatognathic system, as the condyles.</p><p><strong>Objective: </strong>This study aimed to evaluate the structural and positional changes of mandibular condyles in ortho-surgical patients who underwent mandibular advancement surgery.</p><p><strong>Material and methods: </strong>A prospective investigation was conducted with cone-beam computed tomography images. Using Dolphin Imaging® software, seven ortho-surgical patients with Angle Class II malocclusion and mandibular deficiency were evaluated. The images assessed were obtained at pre-surgical phase and after, at least, 1 year of the procedure. To study the structural and positional changes of condyles, linear and angular measurements were obtained, and the right and left sides of patients were compared. Descriptive statistical analysis was performed and, in order to verify possible significant differences, normality tests (Kolmogorov-Smirnov) were applied, followed by a paired t-test to define significance.</p><p><strong>Results: </strong>For all measures evaluated in this study, no statistically significant differences were found.</p><p><strong>Conclusion: </strong>The ortho-surgical procedure performed did not change the structure and position of the condyles of patients who underwent surgical mandibular advancement. Right and left mandibular condyles behaved similarly, suggesting stability and condylar adaptation after surgery.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e2423261"},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235570/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141564741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Changes in the arch width and buccal corridor after fixed orthodontic treatment with Damon self-ligating system: premolar extraction vs. non-extraction.","authors":"Sarah Bühling, Sabrina Schmied, Sara Eslami, Silvia Brandt, Nicolas Plein, Stefan Kopp, Babak Sayahpour","doi":"10.1590/2177-6709.29.3.e2423159.oar","DOIUrl":"10.1590/2177-6709.29.3.e2423159.oar","url":null,"abstract":"<p><strong>Introduction: </strong>Extraction vs. non-extraction is a crucial decision in orthodontic therapy.</p><p><strong>Objective: </strong>The aim of the present study was to investigate the changes in the dental arch width and buccal corridor after orthodontic treatment using extraction and non-extraction therapy with Damon self-ligating system.</p><p><strong>Material and methods: </strong>This retrospective study consisted of 35 patients (20 female and 15 male patients with median age of 12.5 years), treated by extracting 4 or 2 premolars, and 37 patients (16 female and 21 male patients with the median age of 12.8 years), treated without premolar extraction. Both groups were treated with Damon self-ligating system. Plaster models before (T0) and after (T1) treatment were measured, and the arch width values were determined at the level of the first molars, second premolars, canines and palatal rugae. Buccal corridor width was measured using the extraoral images at T0 and T1. Paired t-test was used for the analysis of the normally distributed data, and Wilcoxon Mann-Whitney U test was used for the data with non-normal distribution. Values of p<0.05 were set as statistically significant.</p><p><strong>Results: </strong>The upper intercanine width increased significantly in both groups (p<0.01). In the non-extraction group, the arch width increased significantly in the maxillary second premolar and first molar region (p<0.01) as well as in the region of the canines (p=0.04), second premolars (p=0.01) and first molars (p<0.01) of the mandible. The buccal corridor decreased significantly in the non-extraction group (p<0.01).</p><p><strong>Conclusion: </strong>Premolar extraction in combination with Damon self-ligating system did not lead to reduction of the dental arch width in the maxilla, nor did it increase the size of the buccal corridors.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e2423159"},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235572/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141564738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiographic evaluation of enamel thickness of permanent teeth: relevance and applicability.","authors":"Nicole Tonin Iplinsky, Luiz Gonzaga Gandini Junior, Alyssa Schiavon Gandini, Ana Thais Bagatini, Pedro Henrique José de Oliveira, Paula Cristina Henriques da Silva, Ary Santos-Pinto","doi":"10.1590/2177-6709.29.3.e242422.oar","DOIUrl":"10.1590/2177-6709.29.3.e242422.oar","url":null,"abstract":"<p><strong>Objective: </strong>This descriptive observational study aimed to determine clinically relevant and applicable data of enamel thickness (ETH), considering the mesio-distal differences of anterior and posterior permanent teeth and their relationships.</p><p><strong>Material and methods: </strong>The sample consisted of right-sided standardized radiographs of 34 individuals (21 females and 13 males), aged between 13 and 24 (average 16) years, with all permanent teeth intact and without crowding. Four periapical and four interproximal radiographs were obtained and digitized. ETH measurements (mesial to distal contact points at the dentin-enamel junction) were performed after correction for radiographic image magnification. The Students' t-test was applied to the differences between paired means, with the Pearson correlation to evaluate the correlation between them.</p><p><strong>Results: </strong>The mesial and distal ETH increased from the anterior to the posterior teeth. Incisor ETH ranged between 0.60 and 0.84 mm. Canines, premolars, and molars were more than 1.0 mm thick, and molar enamel reached values between 1.26 and 1.44 mm.</p><p><strong>Conclusion: </strong>Distal ETH was significantly greater than the mesial ETH, and progressively thicker from the anterior to posterior teeth. Interproximal reduction (IPR) of the lower central and upper lateral incisors should be avoided, reduced, or performed on their distal surfaces. There is a positive and significant correlation between ETH and the mesial and distal surfaces of the teeth. Periapical radiographs and evaluation of the remaining ETH are necessary in cases of retreatment. The location and number of tooth size discrepancies should be considered in treatment planning and appropriately compensated with IPR.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e242422"},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235574/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141564743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of speech changes caused by four different orthodontic retainers: a crossover randomized clinical trial.","authors":"Diego Coelho Lorenzoni, José Fernando Castanha Henriques, Letícia Korb da Silva, Raquel Rodrigues Rosa, Giédre Berretin-Felix, Karina Maria Salvatore Freitas, Guilherme Janson","doi":"10.1590/2177-6709.29.3.e2423277.oar","DOIUrl":"10.1590/2177-6709.29.3.e2423277.oar","url":null,"abstract":"<p><strong>Objective: </strong>This study aimed to compare the influence of four different maxillary removable orthodontic retainers on speech.</p><p><strong>Material and methods: </strong>Eligibility criteria for sample selection were: 20-40-year subjects with acceptable occlusion, native speakers of Portuguese. The volunteers (n=21) were divided in four groups randomized with a 1:1:1:1 allocation ratio. The four groups used, in random order, the four types of retainers full-time for 21 days each, with a washout period of 7-days. The removable maxillary retainers were: conventional wraparound, wraparound with an anterior hole, U-shaped wraparound, and thermoplastic retainer. Three volunteers were excluded. The final sample comprised 18 subjects (11 male; 7 female) with mean age of 27.08 years (SD=4.65). The speech evaluation was performed in vocal excerpts recordings made before, immediately after, and 21 days after the installation of each retainer, with auditory-perceptual and acoustic analysis of formant frequencies F1 and F2 of the vowels. Repeated measures ANOVA and Friedman with Tukey tests were used for statistical comparison.</p><p><strong>Results: </strong>Speech changes increased immediately after conventional wraparound and thermoplastic retainer installation, and reduced after 21 days, but not to normal levels. However, this increase was statistically significant only for the wraparound with anterior hole and the thermoplastic retainer. Formant frequencies of vowels were altered at initial time, and the changes remained in conventional, U-shaped and thermoplastic appliances after three weeks.</p><p><strong>Conclusions: </strong>The thermoplastic retainer was more harmful to the speech than wraparound appliances. The conventional and U-shaped retainers interfered less in speech. The three-week period was not sufficient for speech adaptation.</p>","PeriodicalId":38720,"journal":{"name":"Dental Press Journal of Orthodontics","volume":"29 3","pages":"e2423277"},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11235575/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141564739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}