Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie最新文献

{"title":"Possible link between the preferential unilateral chewing side and eruptive guidance of the maxillary canine germ : Cross-sectional study on panoramic radiographs.","authors":"Jesús Miguel Ticona-Flores, Guillermo Reichard-Monefeldt, Montserrat Diéguez-Pérez","doi":"10.1007/s00056-024-00566-7","DOIUrl":"https://doi.org/10.1007/s00056-024-00566-7","url":null,"abstract":"<p><strong>Aim: </strong>To determine whether unilateral preferent chewing (UPC) affects the position and angulation of the permanent maxillary canine germ on the preferred side.</p><p><strong>Materials and methods: </strong>In a retrospective cross-sectional study, medical records from children 7.91(± 0.8) years old with unilateral preferred chewing side and unilateral posterior crossbite were selected. The position of the maxillary canines was analysed by measuring the following angles and distances: the angles formed between the canine axis and the midline (PS; potential impact range > 15°), and that between the canine axis and the bicondylar line (W; potential impact range < 75°). In addition, the canine's position with respect to the lateral incisor (EK; potential impact range > II) and the distance between the canine cusp and the occlusal plane (CCOP potential impact range > 10 mm) were measured.</p><p><strong>Results: </strong>The final sample consisted of 106 radiographs; thus, a total of 212 maxillary canines were analysed. Tooth angulation on the preferred chewing side was higher for the angle PS with an average angle of 13.88° (± 7.56) and its position was more frequently found in sector II (49.1%), according to the EK analysis, compared to its contralateral that had an average of 11.75° (± 10.13) for the PS angle and a frequency of 67% in the sector I (p < 0.05 in both analyses). The data obtained for the angle W resulted in an average of 76.12° (± 9.09), while on the contralateral side it was 77.16° (± 12.56; p = 0.012). Lastly, according to the CCOP analysis, the preferred chewing side measured on average 15.3 mm (± 2.4), while on the nonpreferred side it was 15.19 mm (± 2.43; p = 0.143).</p><p><strong>Conclusions: </strong>Based on this research, UPC seems to have a certain unfavourable influence on canine position and angulation. Thus, this is another factor to consider in decision-making regarding early treatment of this development disorder.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142878632","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}

{"title":"Treatment of skeletal class III malocclusion with the Alt-RAMEC protocol and intermaxillary elastics : A retrospective cohort study.","authors":"Arife Nihan Kaya, Sema Yüksel","doi":"10.1007/s00056-024-00562-x","DOIUrl":"https://doi.org/10.1007/s00056-024-00562-x","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to evaluate the effects of the use of class III elastics with fixed appliances and the Alt-RAMEC procedure on dentofacial structures in patients diagnosed with skeletal class III malocclusion.</p><p><strong>Methods: </strong>The retrospective cohort study was performed on lateral cephalometric radiographs of 20 individuals (7 girls, 13 boys; mean chronological age 12.41 years) with skeletal class III malocclusion because of maxillary deficiency or maxillary deficiency and mandibular excess which were treated by using the Alt-RAMEC protocol and class III elastics. The patients were chosen from the archive of Gazi University Faculty of Dentistry, Department of Orthodontics. In order to distinguish between growth-related changes and the effects of treatment, results were compared with a control group consisting of 20 individuals (8 girls, 12 boys; mean chronological age 12 years) with similar skeletal characteristics.</p><p><strong>Results: </strong>In the treatment group, there were significant increases of 2.2°, 4.2° and 1° in the SNA, ANB and SN/GoGN angles, respectively, in contrast to the control group (p < 0.001). There was also a significant decrease of 1.9° in the SNB angle within the treatment group in contrast to the control group (p < 0.001). While the U1/SN angle increased by 1.4° in the treatment group, the L1-NB distance decreased by 0.7 mm (p < 0.01).</p><p><strong>Conclusions: </strong>The results of this study showed that application of the Alt-RAMEC protocol and class III elastics with fixed appliances showed successful results in the management of skeletal class III malocclusions, while avoiding undesirable dental effects, such as excessive lingual tipping of the lower incisors.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815058","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}

{"title":"Precision in dentistry: how PLA 3D printing settings influence model accuracy.","authors":"Louis Hartmann, Verena Passin, Sophie Dürndorfer","doi":"10.1007/s00056-024-00563-w","DOIUrl":"https://doi.org/10.1007/s00056-024-00563-w","url":null,"abstract":"<p><strong>Purpose: </strong>Advancements in computer-aided design and manufacturing (CAD/CAM), such as intraoral scanners, digital treatment planning, and 3D printers, offer digital alternatives to conventional orthodontics. For transforming digital data into a traditional model, precise 3D printing technologies are necessary. With numerous settings available on each 3D printer, selecting the most precise one is challenging. Therefore, the impact of layer height, printing temperature, print speed, and infill density on the accuracy of dental models was analyzed in this study.</p><p><strong>Methods: </strong>A 3D file of a right upper central incisor was designed and printed 275 times in total with different settings for temperature, layer height, print speed, and infill density by using polylactic acid (PLA) filament on an industrial 3D printer. After scanning the models, root mean square error was calculated for analysis of precision. For each group, R² value was calculated and linear regression as well as an ANOVA was performed for the factors influencing accuracy.</p><p><strong>Results: </strong>Printing temperature as well as layer height had statistically significant impacts on printing 3D tooth models (p < 0.05). R² values of 0.43 for printing temperature as well as of 0.11 for layer height were detected. The infill density as well as the print speed had no statistically significant impacts on accuracy (p > 0.05).</p><p><strong>Conclusion: </strong>This study confirms that choosing the correct printing temperature and layer height for printing dental models with PLA is important for obtaining good accuracy, whereas print speed and infill density have less of an impact.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792549","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}

{"title":"Effect of torque customization with composite resin bases on the shear bond strength and adhesive remnant patterns of lingual brackets : An in vitro evaluation.","authors":"Sekar Santhosh Kumar, Shivangi Ramteke, Bhaskar Nivethitha, Balasubramanian Madhan","doi":"10.1007/s00056-024-00559-6","DOIUrl":"https://doi.org/10.1007/s00056-024-00559-6","url":null,"abstract":"<p><strong>Purpose: </strong>This study evaluated the effect of torque customization of lingual brackets with resin-modified bases on their shear bond strength (SBS), adhesive remnant index (ARI), and bond failure patterns (BFP).</p><p><strong>Methods: </strong>The sample comprised 200 lingual lower incisor brackets (DTC® ORG, DTC Medical Apparatus, Hangzhou, China); 40 brackets were tested as-received and 4 groups with 40 brackets each were customized for -10, -20, +10 and +20° torque respectively with light-cured composite resin (Transbond XT™, 3M Unitek, Monrovia, CA, USA) bases. All brackets were bonded to bovine mandibular incisors. Their SBS were estimated in a universal testing machine (INSTRON®, Norwood, MA, USA) with a gingivally directed force applied at the incisal bracket-adhesive interface with 1 mm/min crosshead speed. Their ARI and BFP were evaluated under 20× magnification.</p><p><strong>Results: </strong>The SBS was 19.9 ± 7.6 MPa for noncustomized brackets, 20.1 ± 9.0 and 18.7 ± 8.2 MPa for brackets with 10 and 20° of negative torque, and 16.6 ± 5.68 and 19.45 ± 5.84 MPa for brackets with 10 and 20° of positive torque, respectively. The differences were not statistically significant (p = 0.097). Teeth with the -20° brackets exhibited higher median ARI scores than noncustomized brackets (1.5 vs 2, p = 0.018). Adhesive-cohesive bond failure with nearly axial split was more frequent in noncustomized brackets than customized ones, the reverse being true for adhesive-cohesive failure with nearly vertical split (p < 0.05). Truly cohesive bond failures were seen only in brackets with positive torque.</p><p><strong>Conclusions: </strong>Torque customization with a resin base is an acceptable strategy for metal orthodontic brackets as it does not affect their SBS. However, their BFP differed from noncustomized brackets, depending on the type of torque introduced.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792458","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}

{"title":"Effect of tube debonding on the enamel surface in vitro : Evaluation with optical coherence tomography.","authors":"Kyung-Jin Park, Viktor Löffler, Sandra Riemekasten, Dirk Ziebolz, Hartmut Schneider, Rainer Haak","doi":"10.1007/s00056-024-00561-y","DOIUrl":"https://doi.org/10.1007/s00056-024-00561-y","url":null,"abstract":"<p><strong>Objective: </strong>In vitro evaluation of the morphology of the enamel surface before bonding metal tubes and after debonding using spectral domain optical coherence tomography (SD-OCT) and light microscopy.</p><p><strong>Methods: </strong>In all, 40 extracted caries-free human molars without defects were selected and cleaned. The tooth surfaces were imaged by light microscopy and SD-OCT prior to the placement of metal tubes (Titanium Orthos; Ormco, Brea, CA, USA). The metal tubes were bonded to the teeth using four adhesive systems: group 1) BrackFix Primer SE with BrackFix adhesive, group 2) BrackFix Primer with BrackFix adhesive (VOCO, Cuxhaven, Germany), group 3) Transbond Plus SE Primer with Transbond XT adhesive, group 4) Transbond XT Primer with Transbond XT adhesive (reference, 3M Deutschland, Neuss, Germany). After tube removal, the bonded areas were imaged by light microscopy and/or OCT and evaluated according to the following four criteria: (1) depth of cohesive enamel defect, (2) enamel cracks, (3) adhesive residue after tube removal, and (4) adhesive residues after polishing.</p><p><strong>Results: </strong>None of the groups had enamel defects or enamel cracks. Group 1 showed significantly less adhesive residue after tube removal than the other groups (p_i ≤ 0.014). There were no significant differences between the groups for adhesive residues after polishing (p_i ≥ 0.628). Adhesive residues, if present, were only detectable by OCT and covered less than 1% of the enamel surfaces evaluated.</p><p><strong>Conclusion: </strong>Tube removal did not cause clinically relevant enamel damage such as chipping or cracking.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142740854","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}

{"title":"Development and in vitro testing of an orthodontic miniscrew for use in the mandible.","authors":"Carolien A J Bauer, Pauline A M Karl, Juliana M-K Mielke, Christoph J Roser, Christopher J Lux, Mats Scheurer, Ludger Keilig, Christoph Bourauel, Lutz D Hodecker","doi":"10.1007/s00056-024-00560-z","DOIUrl":"https://doi.org/10.1007/s00056-024-00560-z","url":null,"abstract":"<p><strong>Objective: </strong>Temporary anchorage devices (TADs) have been successfully used in the maxilla. However, in the mandible, lower success rates present a challenge in everyday clinical practice. A new TAD design will be presented that is intended to demonstrate optimization of the coupling structure as well as in the thread area for use in the mandible.</p><p><strong>Methods: </strong>Three TADs were examined: (A) Aarhus® system (68.99.33 A, Medicon, Tuttlingen, Germany), (B) BENEfit® orthodontic screw (ST-33-54209; PSM Medical, Gunningen, Germany) and (C) a new design with a two-part screw thread. The TADs were inserted into artificial bone blocks after predrilling to test primary stability. To test the fracture stability, the TADs were embedded in Technovit® 4004 (Heraeus Kulzer, Wehrheim, Germany) and torsional loaded at an angle of 90° until fracture. The threshold torque values occurring were recorded digitally. The statistical evaluation was carried out using the Kruskal-Wallis test with a post hoc test according to Bonferroni (p < 0.05).</p><p><strong>Results: </strong>The following values were measured for the insertion torque: A: 33.7 ± 3.3 Ncm; B: 57.1 ± 8.4 Ncm; C: 34.2 ± 1.4 Ncm. There were significant differences between A-B and B-C. The measured values for the fracture strength were as follows: A: 46.7 ± 3.5 Ncm; B: 64.2 ± 5.1 Ncm; C: 55.4 ± 5.1 Ncm. Significant differences were found between all groups.</p><p><strong>Conclusion: </strong>The adapted screw design has no negative influence on primary and fracture stability. Whether the design has a positive effect on the success rates in the mandible must be clarified in further clinical studies.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142717698","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}

{"title":"The effects of professional expertise on perceptions of treatment need in patients with class II division 1 malocclusion: a comparison between orthodontists, general dentists, and lay people in Germany.","authors":"Sarah Bühling, Stefanie Neidhardt, Babak Sayahpour, Sara Eslami, Nicolas Plein, Stefan Kopp","doi":"10.1007/s00056-024-00551-0","DOIUrl":"https://doi.org/10.1007/s00056-024-00551-0","url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to compare the perception of practitioners with varying levels of expertise and laypeople regarding the orthodontic treatment need and facial harmony in patients with increased anterior overjet.</p><p><strong>Methods: </strong>Three groups of observers (orthodontists, general dentists, and laypeople, in total n = 48) were asked to rate on images-using a 10-point visual analog scale (VAS)-the facial harmony and treatment need of a sample of 8 patients with class II division 1 malocclusion and overjets of 2, 4, 6, and 8 mm.</p><p><strong>Results: </strong>Statistically significant differences were observed between the three groups of observers regarding patients with an overjet of 4 mm and above (p < 0.001). Treatment need was perceived at an overjet of 4 mm by orthodontists and 6 mm by general dentists, whereas laypeople did not perceive a need for treatment in any of the groups (p < 0.001). Regarding perception of facial harmony, orthodontists had the lowest threshold (4 mm overjet), while dentists followed at a greater overjet of 6 mm or more (p < 0.001). A statistically significant correlation between the noticed facial harmony and the perceived orthodontic treatment need was found in all observers (p < 0.001).</p><p><strong>Conclusion: </strong>The perceived orthodontic treatment need for class II division 1 malocclusion increased with increasing professional expertise.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142570371","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}

{"title":"Factors that may increase the risk of external apical root resorption during orthodontic treatment : Retrospective clinical investigation.","authors":"Burçak Kaya, Ayşe Gülşahı, Gizem Türkyılmaz","doi":"10.1007/s00056-023-00485-z","DOIUrl":"10.1007/s00056-023-00485-z","url":null,"abstract":"<p><strong>Purpose: </strong>To determine the correlation between external apical root resorption and malocclusion-related variables in patients treated with fixed orthodontic appliances.</p><p><strong>Methods: </strong>In all, 103 patients aged 12-15 years and treated with edge-wise appliances either without extractions or with four premolar extractions were included in this retrospective cohort study. External apical root resorption was assessed in the pre- and posttreatment panoramic radiographs of these patients for incisors, canines, premolars, and first molars. A total of 2332 teeth were evaluated in 206 panoramic radiographs obtained from 103 patients. The gender of the patients, duration of orthodontic treatments, presence of premolar extractions, Angle classification, overbite, overjet and amount of crowding were assessed. Wilcoxon signed-rank test, Mann-Whitney U test, and Kruskal-Wallis test were used for statistical analysis of the data.</p><p><strong>Results: </strong>Statistically significant (p < 0.001) root resorption occurred in all examined teeth during orthodontic treatment. The degree of root resorption observed in the premolars was significantly greater in premolar extraction cases than in nonextraction cases. Statistically significant negative correlations were found between the degree of root resorption of the maxillary lateral teeth and between the maxillary first premolar teeth and the amount of maxillary crowding.</p><p><strong>Conclusions: </strong>The orthodontic treatment protocols and the amount of tooth movements achieved were shown to be dependent on the severity of dental malocclusions and they have an influence on the amount of external apical root resorption that occurs during the course of orthodontic treatment.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":"425-434"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9693405","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}

{"title":"Effect of orthodontic extraction of mandibular premolars on third molar angulation after treatment with fixed appliances : A cross-sectional study.","authors":"Tamara Di Giovanni, Theodosia Vogiatzi, Vasiliki Koretsi, Tanya Walsh, Nick Silikas, Spyridon N Papageorgiou","doi":"10.1007/s00056-023-00465-3","DOIUrl":"10.1007/s00056-023-00465-3","url":null,"abstract":"<p><strong>Purpose: </strong>Orthodontic treatment involving premolar extractions might improve the angulation of lower third molars, which are the teeth most often impacted. This study analyzes the impact of first/second lower premolar extraction during orthodontic therapy on the angulation of mandibular third molars.</p><p><strong>Methods: </strong>A total of 120 patients treated non-extraction (n = 40), with extraction of first (n = 40), or second lower premolars (n = 40) were included. The mesiodistal angulation of lower third molars relative to the adjacent tooth and their developmental stage were evaluated from posttreatment orthopantomograms. Between-group differences were statistically evaluated at a significance level of 0.05.</p><p><strong>Results: </strong>The orthopantomograms of 120 patients (51% female) with a median age of 15.2 years at the time of debonding were evaluated after a mean treatment duration time of 2.9 years. No difference (P > 0.05) was seen between the average angulation of the lower third molars of the right (mean = 24.4°, standard deviation [SD] 13.6°) and the left side (mean = 23.6°, SD 14.1°). No differences in the angulation of the lower third molar were found between the non-extraction and extraction groups for the right (P = 0.44) or the left side (P = 0.22). Likewise, no differences were found when comparing the first and second premolars for the right (P = 0.26) or the left side (P = 0.10). Premolar extraction was associated with an advanced root development stage of the right third molar (odds ratio 7.1; 95% confidence interval 1.1-48.1; P = 0.04), with no differences between extraction of the first or second premolar (P = 0.10).</p><p><strong>Conclusion: </strong>Orthodontic treatment involving premolars extractions might be associated with a small acceleration in root development, but not with the angulation, of lower third molars.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":"392-403"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11496369/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9222876","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}

{"title":"Scanning electron microscopy evaluation of enamel surfaces using different air-polishing powders in the orthodontic setting: an in vitro study.","authors":"Philipp Ratzka, Paul Zaslansky, Paul-Georg Jost-Brinkmann","doi":"10.1007/s00056-023-00466-2","DOIUrl":"10.1007/s00056-023-00466-2","url":null,"abstract":"<p><strong>Purpose: </strong>The aim of this in vitro study was to quantify and compare changes of the enamel surface caused by periodical use of different air-polishing powders during multibracket therapy.</p><p><strong>Methods: </strong>Bovine high-gloss polished enamel specimens were air-polished using an AIR-FLOW® Master Piezon with maximum powder and water settings. Each specimen was blasted with sodium bicarbonate (AIR-FLOW® Powder Classic, Electro Medical Systems, Munich, Germany) and erythritol (AIR-FLOW® Powder Plus, Electro Medical Systems). Blasting duration was adapted to the powders' cleaning efficacy and corresponded to 25 air-polishing treatments in a patient with braces. A spindle apparatus ensured uniform guidance at a distance of 4 mm and a 90° angle. Qualitative and quantitative assessments were performed with the use of low vacuum scanning electron microscopy. Following external filtering and image processing, arithmetical square height (S_a) and root mean square height (S_q) were determined.</p><p><strong>Results: </strong>Both prophy powders caused a significant increase in enamel roughness. Surfaces blasted with sodium bicarbonate (S_a = 64.35 ± 36.65 nm; S_q = 80.14 ± 44.80 nm) showed significantly (p < 0.001) higher roughness than samples treated with erythritol (S_a = 24.40 ± 7.42 nm; S_q = 30.86 ± 9.30 nm). The observed defects in enamel structure caused by sodium bicarbonate extended across prism boundaries. Prism structure remained intact after air-polishing with erythritol.</p><p><strong>Conclusion: </strong>Both applied air-polishing powders led to surface alterations. Despite shorter treatment times, sodium bicarbonate was significantly more abrasive than erythritol. Clinicians must compromise between saving time and abrasively removing healthy enamel.</p>","PeriodicalId":54776,"journal":{"name":"Journal of Orofacial Orthopedics-Fortschritte Der Kieferorthopadie","volume":" ","pages":"404-413"},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11496338/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9417323","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}