International Orthodontics最新文献

{"title":"Effectiveness of low-intensity electrical current in accelerating the en-masse retraction of the upper anterior teeth following first-premolar extraction in young adult patients with Class II division 1 malocclusion: A randomized controlled clinical trial","authors":"Rashad I. Shaadouh , Mohammad Y. Hajeer , Mohammed Adel Awawdeh , Samer T. Jaber , Ghiath A. Mahmoud , Imad-Addin Almasri","doi":"10.1016/j.ortho.2024.100921","DOIUrl":"10.1016/j.ortho.2024.100921","url":null,"abstract":"<div><h3>Introduction</h3><div>Many efforts have been made to shorten fixed appliance orthodontic treatment time by accelerating the rate of tooth movement. Low-intensity electrical stimulation (LIES) is one of the proposed physical methods that has not yet been well studied in the medical literature. This study aimed to evaluate the effectiveness of LIES in accelerating orthodontic tooth movement in cases of en-mass retraction of the upper anterior teeth.</div></div><div><h3>Methods</h3><div>Patients who attended the Department of Orthodontics at the Faculty of Dentistry, University of Damascus, between September 2019 and February 2021, for treatment were carefully checked. All patients who met the eligibility criteria were invited to participate in this RCT. Young adult patients having class II division I malocclusion were equally and randomly assigned into the low-intensity electrical stimulation group (LIES), and traditional en-masse retraction group (TRAD). The mini-implants assisted en-masse retraction technique was used to close the extracted upper first premolar spaces in both groups. NiTi closed coil springs (250<!--> <!-->g/side) were used. Electrical stimulation of 15-20<!--> <!-->μA for each tooth was applied on the upper anterior teeth using a recently developed intraorally removable device in the LIES group. The primary outcome was the en-masse retraction rate, the secondary outcomes were changes in the first molar position, intermolar width, and intercanine width. These outcomes were measured on the digital photographs of the maxilla cast using the Image J program. Two-sample t-test with Bonferroni's correction was utilized to explore any significant differences between the two groups in all studied variables.</div></div><div><h3>Results</h3><div>Of the 168 patients examined by the researcher, 38 patients with Class II division I malocclusion (30 females and 8 males; mean age: 21.1<!--> <!-->±<!--> <!-->2.31 years) were finally recruited in this RCT. The overall en-masse retraction rate was significantly greater in the LIES group compared to the TRAD group (1.02<!--> <!-->±<!--> <!-->0.08, 0.73<!--> <!-->±<!--> <!-->0.04<!--> <!-->mm/month respectively; <em>P</em> <!--><<!--> <!-->0.001). In addition, the monthly rate of space closure was significantly greater in this group at all evaluation times (<em>P</em> <!--><<!--> <!-->0.001). A small increase was noted in the intercanine width (1.60<!--> <!-->±<!--> <!-->0.27, and 1.65<!--> <!-->±<!--> <!-->0.33<!--> <!-->mm respectively). Negligible changes were noted in the first molar positions and intermolar width, with insignificant differences between the two groups.</div></div><div><h3>Conclusions</h3><div>LIES according to the protocol applied in this trial accelerated the upper anterior teeth en-masse retraction rate by approximately 28% compared to the traditional en-masse retraction method. While this acceleration was statistically significant, may not have substantial clin","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100921"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of dental movements in digital setups created by orthodontists and “3shape design service®” engineers: A cross-sectional study","authors":"Aymar de Leotard,&nbsp;Elvire Le Norcy","doi":"10.1016/j.ortho.2024.100919","DOIUrl":"10.1016/j.ortho.2024.100919","url":null,"abstract":"<div><h3>Introduction</h3><div>The demand for faster and invisible orthodontic treatments has led to the increased use of clear aligners, facilitated by advancements in digital treatment planning. This study aims to evaluate the reliability of digital orthodontic setups performed by orthodontists compared to those by 3Shape Design Service®engineers.</div></div><div><h3>Material and methods</h3><div>A monocentric, cross-sectional observational study was conducted at Bretonneau Hospital from October 2022 to May 2023. All patients meeting the inclusion criteria and willing to participate were included in the study. Intraoral scans were used to create treatment setups using the Ortho System® software, performed by both orthodontists and 3Shape® engineers. The primary objective was to compare the dental movements (rotation, intrusion, extrusion, buccolingual inclination, tipping, mesiodistal translation and buccolingual translation) between the two groups. Secondary objectives included the number of teeth displaced, aligners needed, interproximal enamel reduction and number of attachments placed.</div></div><div><h3>Results</h3><div>Nineteen patients with mild to moderate malocclusion were included. Statistically significant differences were found in tooth displacements between the two groups with engineers executing greater dental movements for derotation (4.9<!--> <!-->±<!--> <!-->2.6 vs. 3.7<!--> <!-->±<!--> <!-->2.3), tipping (0.79<!--> <!-->±<!--> <!-->0.69 vs. 0.26<!--> <!-->±<!--> <!-->0.44), bucco-lingual (0.40<!--> <!-->±<!--> <!-->0.26 vs. 0.08<!--> <!-->±<!--> <!-->0.11) and mesio-distal translations (0.31<!--> <!-->±<!--> <!-->0.20 vs. 0.20<!--> <!-->±<!--> <!-->0.17). Secondary measures showed no significant differences except for the number of teeth displaced (15.32<!--> <!-->±<!--> <!-->5.21 vs. 9.68<!--> <!-->±<!--> <!-->4.82), which was higher in the 3Shape group.</div></div><div><h3>Discussion</h3><div>While digital setups by engineers showed more significant tooth movements, the practical impact on mild malocclusion treatment was minimal. This study highlights the need for precise treatment objectives and consideration of overcorrection practices.</div></div><div><h3>Conclusion</h3><div>For mild malocclusions, outsourcing setups to 3Shape engineers can be an alternative to in-office setups by orthodontists. However, further studies are needed to evaluate setup reliability for more complex malocclusions.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100919"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1761722724000755/pdfft?md5=ae1a803e1ff0c3d31fc83187b53ab02b&pid=1-s2.0-S1761722724000755-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312396","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":"Surgical-orthodontic approach of two palatally impacted canines with maxillary lateral incisor anomalies in a growing class II patient: A case report","authors":"Maria Francesca Sfondrini ,&nbsp;Federica Gariboldi ,&nbsp;Roberto Alcozer ,&nbsp;Domenico Sfondrini ,&nbsp;Andrea Scribante","doi":"10.1016/j.ortho.2024.100920","DOIUrl":"10.1016/j.ortho.2024.100920","url":null,"abstract":"<div><h3>Introduction</h3><div>After the mandibular third molars, the maxillary canines are the most displaced or impacted teeth in permanent dentition. Surgical-orthodontic disimpaction of impacted canines, followed by aesthetic reconstructions, can be a successful treatment choice.</div></div><div><h3>Aim</h3><div>The aim of this case report was to describe the smile restoration through simultaneous surgical disimpaction of the two upper permanent canines in a 13-year-old patient who also presented with agenesis of the right upper lateral incisor and a conoid-shaped left upper lateral incisor.</div></div><div><h3>Treatment protocol</h3><div>The present case report followed the Care Checklist For Case Reports. After having completed the multibrackets fixed orthodontic therapy phase necessary for the preparation of the anchorage, avulsions of the upper deciduous canines were carried out, followed by the making of surgical full thickness palatal flap in order to perform traction of the permanent canines, and an orthodontic eyelet with passive metal looped ligatures was applied. One week after the surgery, traction was started with Crescini-double arch technique. Subsequently, the avulsion of elements 2.2 and 5.2 were executed. At the end of orthodontic treatment, in order to optimise the aesthetics and function of the canines, a restorative treatment was carried out.</div></div><div><h3>Results and conclusions</h3><div>After the surgical creation of a palatal flap, the disimpaction of the two upper canines, using the double arch technique, allowed the teeth to be moved into the desired position on the upper arch.</div></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100920"},"PeriodicalIF":1.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1761722724000767/pdfft?md5=1c87419a23740209486815d5a4d4adfb&pid=1-s2.0-S1761722724000767-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142312309","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 staining orthodontic adhesive provide an advantage in adhesive resin removal and enamel roughness? An in vitro study","authors":"Nehal F. Albelasy ,&nbsp;Ahmad M. Hafez ,&nbsp;Dina S. Farahat ,&nbsp;Marwa S. Shamaa","doi":"10.1016/j.ortho.2024.100915","DOIUrl":"10.1016/j.ortho.2024.100915","url":null,"abstract":"<div><h3>Background</h3><p>The removal of adhesive remnants after bracket debonding has been shown to cause damaging effects on the enamel surface. This study aimed to investigate the efficacy of stained adhesive remnant removal (ARR) on enamel roughness compared to translucent composite.</p></div><div><h3>Material and methods</h3><p>Thirty extracted premolar teeth were divided equally into three groups; conventional composite control group (CC), stained composite group (SC) and stained bonding solution group (SB). The buccal surface of each tooth was cleaned, dried and the surface roughness (Ra) was evaluated using a contact prophylometer (T0). After bracket debonding, a high-speed carbide bur under a water-cooling system was used for ARR in one direction and the time consumed for ARR was recorded. After ARR, the second mean Ra values were recorded (T1). The samples were then polished using polishing paste with low-speed rubber cup and the third mean Ra values were recorded (T2).</p></div><div><h3>Results</h3><p>Repeated one-way ANOVA revealed a significant difference in the mean Ra values at T0, T1 and T2 within each group <em>P</em> <!-->˂<!--> <!-->0.05. A statistically significant difference in the changes of the mean Ra values after ARR (T1–T0) and after polishing (T1–T2) was found between the CC group and both SC and SB groups. A significant difference in the time consumed for ARR was found between the three groups with CC group being the most time-consuming group.</p></div><div><h3>Conclusion</h3><p>Stained composite material followed by the stained bonding solution provided better visibility during ARR with lower mean Ra values and less time for ARR compared totranslucent composite material.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100915"},"PeriodicalIF":1.8,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142146566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clear aligner treatment of an adult open bite with bilateral missing mandibular first molars through molar protraction with Albert cantilever arms","authors":"Haoxin Zhang ,&nbsp;Huimin Hu ,&nbsp;Donger Lin ,&nbsp;Maierdanjiang Rouzi ,&nbsp;Di Shan ,&nbsp;Wenli Lai ,&nbsp;Hu Long","doi":"10.1016/j.ortho.2024.100918","DOIUrl":"10.1016/j.ortho.2024.100918","url":null,"abstract":"<div><p>Premature loss of first permanent molars is a common occurrence in clinical practice, leading to abnormal occlusion and inefficient mastication for patients. This case report presented the orthodontic retreatment of a 32-year-old female patient who suffered from premature loss of mandibular bilateral first molars. The mesial tipping of the mandibular second molars led to an occlusal interference, resulting in a clockwise rotation of the lower jaw and an anterior open bite (AOB). We achieved long-distance molar mesialization using clear aligners with Albert cantilever arms. After 42 months of treatment, the patient's occlusion and facial profile significantly improved. The cantilever combined with the cleat aligner treatment has been clinically effective for the protraction of mandibular posterior teeth, extending the field of application of clear aligners.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100918"},"PeriodicalIF":1.8,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142146565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of continuous positive airway pressure therapy on blood levels of IL-6, IL-10, IL-18, IL-1β, IL-4, and IL-17 in obstructive sleep apnoea adults: A systematic review, meta-analysis and trial sequential analysis","authors":"Iman Mohammadi ,&nbsp;Mehrdad Adibparsa ,&nbsp;Raya Kh. Yashooa ,&nbsp;Mohammad Soroush Sehat ,&nbsp;Masoud Sadeghi","doi":"10.1016/j.ortho.2024.100917","DOIUrl":"10.1016/j.ortho.2024.100917","url":null,"abstract":"<div><h3>Introduction</h3><p>Obstructive sleep apnoea (OSA) is a long-term disorder characterized by frequent blockages in the upper respiratory tract during sleep, often leading to abrupt awakenings, with or without a decrease in oxygen levels. The systematic review and meta-analysis aimed to assess the effect of continuous positive airway pressure therapy (CPAP) on blood interleukin (IL) levels of IL-6, IL-10, IL-18, IL-1β, IL-4, and IL-17 in OSA adults.</p></div><div><h3>Materials and methods</h3><p>The published databases from PubMed, Scopus, Web of Science, and Cochrane Library were searched from 2003 to 2024, without any restrictions. The Review Manager software 5.3 was employed to compute effect sizes, which were presented as the standardized mean difference (SMD) along with a 95% confidence interval (CI).</p></div><div><h3>Results</h3><p>In total, 320 records were identified through database searching; ultimately, 42 articles were included in the qualitative synthesis and then the meta-analysis. The CPAP therapy significantly reduces IL-6 levels, as indicated SMD<!--> <!-->=<!--> <!-->0.64 [95% CI: 0.35, 0.93] and <em>P</em> <!-->&lt;<!--> <!-->0.0001. CPAP therapy significantly reduced IL-18 and IL-1β levels in adults with OSA, but there is no significant difference in IL-10, IL-4, or IL-17 levels. Age, blood sample, body mass index, ethnicity, and treatment duration for IL-6 and apnoea-hypopnea index with IL-10 levels were effective factors in the pooled results. Experimentally, there was an interaction between IL-18 and IL-1β.</p></div><div><h3>Conclusions</h3><p>CPAP therapy has a positive impact on inflammatory markers in OSA adults; remarkably, it reduces IL-6 and IL-1β levels. Nevertheless, more evidence (such as the role of ethnicity) and understanding of interactions are needed.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100917"},"PeriodicalIF":1.8,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142099636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of different post materials and designs on upper central tooth torque and intrusion load: A finite element analysis study","authors":"Farhad Salmanpour,&nbsp;Hasan Camcı","doi":"10.1016/j.ortho.2024.100903","DOIUrl":"10.1016/j.ortho.2024.100903","url":null,"abstract":"<div><h3>Purposes</h3><p>The aim of this study was to examine the effects of post material type and the presence of ferrules on the torque and intrusion load of the upper central tooth using finite element analysis.</p></div><div><h3>Methods</h3><p>The upper central tooth and surrounding tissues (cortical bone, cancellous bone, and periodontal ligament) were modelled in three dimensions using the Spaceclaim software. Five simulated models (SM) different modifications were made to this main model: metal cast post (SM1) and glass fiber post-core with zirconium crown and without a ferrule (SM2), metal cast (SM3) post and glass fiber post with a ferrule and zirconium crown (SM4) and only zirconium crown (SM5). In all five simulations, in order to simulate lingual root torque movement, a total load of 40 grams was applied to the bracket slot as 20 grams of force couples and in order to simulate intrusion movement, a load of 40 grams was applied to the superior wall of the bracket slot. The stress caused by the applied loads on the root surfaces was determined using finite element analysis. Maximum principal stress (MPS) value was used in the comparison.</p></div><div><h3>Results</h3><p>The highest root surface MPS values for both intrusion and torque loads belonged to SM2 (3.864 and 0.379<!--> <!-->MPa, respectively). The presence of ferrules in both intrusion and torque loads reduced the stress by approximately half (from 3.864 to 2.004<!--> <!-->MPa). In all five models, the radicular area with higher stress was located in the cervical third on the lingual surface when both torque and intrusion loads were applied.</p></div><div><h3>Conclusion</h3><p>The amount and localization of stress was affected by the type of post material. The variation in stress values between the materials remains within a safe range (0.099 and 3.87<!--> <!-->MPa), making both materials suitable for use under orthodontic forces.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100903"},"PeriodicalIF":1.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effectiveness and side effects of orthodontic traction of impacted maxillary incisors in a labially inverted position: A systematic review","authors":"Luis Ernesto Arriola-Guillén ,&nbsp;Yalil Augusto Rodríguez-Cárdenas ,&nbsp;Gustavo Armando Ruíz-Mora ,&nbsp;Aron Aliaga-Del Castillo ,&nbsp;Heraldo Luis Dias-Da Silveira ,&nbsp;Vinicius Dutra","doi":"10.1016/j.ortho.2024.100916","DOIUrl":"10.1016/j.ortho.2024.100916","url":null,"abstract":"<div><h3>Introduction</h3><p>Treatment of impacted upper incisors in a labially inverted position is challenging for orthodontists, and its prognosis has not been established in the literature. Thus, this systematic review aimed to determine the effectiveness and side effects of orthodontic traction of impacted maxillary incisors in a labially inverted position.</p></div><div><h3>Methods</h3><p>A comprehensive search was conducted in multiple databases, including MEDLINE (via PubMed), Scopus, Embase, Science Direct, and LILACS, up to June 30, 2024. Initially, 1640 articles were identified, and after applying specific selection criteria, 11 articles were selected for full-text evaluation. Following the review, only six studies were deemed relevant, comprising one before-and-after study, two longitudinal retrospective studies, and three cross-sectional studies. Newcastle-Ottawa and Risk of Bias (ROB-2) tools were used to assess the risk of bias in the selected studies.</p></div><div><h3>Results</h3><p>The average duration of traction for maxillary labially inverted impacted central incisors ranged from 8.60<!--> <!-->±<!--> <!-->1.26<!--> <!-->months to 18<!--> <!-->±<!--> <!-->6.0<!--> <!-->months, with all cases being successfully treated. Following traction, the clinical crown height of the incisors was significantly higher compared to the control group (<em>P</em> <!-->&lt;<!--> <!-->0.01). Similarly, the root length of the impacted incisors after traction was shorter in the impaction group (approximately 2<!--> <!-->mm) compared to the control group. Likewise, the thickness of the alveolar bone varied among different studies. Some authors noted that the treatment group had a smaller thickness (about 0.5<!--> <!-->mm) compared to the control group (<em>P</em> <!-->&lt;<!--> <!-->0.05), while other authors found similar thickness after treatment.</p></div><div><h3>Conclusions</h3><p>Although there are few reported studies with a low risk of bias, it is clear that it is possible to successfully treat labially inverted impacted maxillary central incisors with apparently few side effects. Following traction, the clinical crown height of these incisors increased, while the root length was shorter than their normally erupted contralateral teeth.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100916"},"PeriodicalIF":1.8,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of print orientation on the dimensional accuracy and cost-effectiveness of rapid-prototyped dental models using a PolyJet photopolymerization printer: An in vitro study","authors":"Naveen K. Subbaiah,&nbsp;Prabhat Kumar Chaudhari,&nbsp;Ritu Duggal,&nbsp;Vilas D. Samrit","doi":"10.1016/j.ortho.2024.100902","DOIUrl":"10.1016/j.ortho.2024.100902","url":null,"abstract":"<div><h3>Objectives</h3><p>The purpose of this study was to evaluate the accuracy and cost-effectiveness of the dental models 3D printed in vertical and horizontal orientation as compared to the conventional plaster and digital models.</p></div><div><h3>Methods</h3><p>This study involved scanning 50 plaster models using Maestro 3D Desktop Scanner (AGE Solutions, Pisa, Italy). The STL file obtained from the scanner was processed and three-dimensionally (3D) printed in the horizontal and vertical orientation using a PolyJet 3D printer (Objet 30 prime, Stratasys Ltd., Eden Prairie, Minnesota, United States). The accuracy of the rapid-prototyped (3D printed) models was measured from the pre-determined landmarks and was compared among the groups. In addition, determining the cost-effectiveness of the 3D printed models in different orientations was based on the amount of material (resin) utilized during the 3D printing process. ANOVA was used to determine the accuracy of the models.</p></div><div><h3>Results</h3><p>There were statistically insignificant differences (<em>P</em> <!-->&gt;<!--> <!-->0.05) among rapid-prototyped models (≤<!--> <!-->0.06<!--> <!-->mm) compared to plaster models and digital models for the linear measurements made in all three planes of space. The dental models printed in the horizontal orientation were found to be more cost-effective than those printed in a vertical orientation in terms of the amount of material (resin) utilized and printing time during the 3D printing process.</p></div><div><h3>Conclusions</h3><p>The accuracy of rapid-prototyped models 3D printed in the horizontal and vertical orientations was comparable to the plaster models and digital models for clinical applications. Horizontally printed models were more cost-effective than vertically printed models.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100902"},"PeriodicalIF":1.8,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142039587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the physico-mechanical, anti-bacterial, and anti-demineralization properties of orthodontic resin composite containing different concentrations of photoactivated zinc oxide nanoparticles on Streptococcus mutans biofilm around ceramic and metal orthodontic brackets: An ex vivo study","authors":"Yasamin Babaee Hemmati ,&nbsp;Rashin Bahrami ,&nbsp;Maryam Pourhajibagher","doi":"10.1016/j.ortho.2024.100901","DOIUrl":"10.1016/j.ortho.2024.100901","url":null,"abstract":"<div><h3>Background and purpose</h3><p>The aim of this study was to evaluate the physico-mechanical, anti-bacterial, and anti-demineralization properties of orthodontic resin composite containing photoactivated zinc oxide nanoparticles (ZnONPs) on <em>Streptococcus mutans</em> biofilm around ceramic and metal brackets.</p></div><div><h3>Material and methods</h3><p>Following the minimum inhibitory concentration (MIC) determination for ZnONPs, shear bond strength (SBS) was tested for composites containing different concentrations of ZnONPs. The chosen concentration was used to evaluate the microleakage, anti-bacterial, and anti-demineralization properties.</p></div><div><h3>Results</h3><p>Adding 50<!--> <!-->μg/mL of ZnONPs to the orthodontic composite did not negatively affect its physico-mechanical properties. ZnONPs (50<!--> <!-->μg/mL)-mediated aPDT and 0.2% chlorhexidine significantly (<em>P</em> <!-->=<!--> <!-->0.000) reduced <em>S. mutans</em> biofilms compared to the phosphate-buffered saline (PBS) groups (metal/PBS<!--> <!-->=<!--> <!-->7.47<!--> <!-->±<!--> <!-->0.7<!--> <!-->×<!--> <!-->10⁶, and ceramic/PBS<!--> <!-->=<!--> <!-->7.47<!--> <!-->±<!--> <!-->0.7<!--> <!-->×<!--> <!-->10⁶), with the lowest colony count observed in these groups (metal/chlorhexidine<!--> <!-->=<!--> <!-->1.06<!--> <!-->±<!--> <!-->0.4<!--> <!-->×<!--> <!-->10⁵, ceramic/chlorhexidine<!--> <!-->=<!--> <!-->1<!--> <!-->±<!--> <!-->0.2<!--> <!-->×<!--> <!-->10⁵, metal/ZnONPs-mediated aPDT<!--> <!-->=<!--> <!-->1.33<!--> <!-->±<!--> <!-->0.3<!--> <!-->×<!--> <!-->10⁵, and ceramic/ZnONPs-mediated aPDT<!--> <!-->=<!--> <!-->1.2<!--> <!-->±<!--> <!-->0.3<!--> <!-->×<!--> <!-->10⁵). Sodium fluoride varnish and ZnONPs-mediated aPDT showed the highest efficacy in anti-demineralization and significantly improving the enamel surface microhardness compared to the artificial saliva, especially in ceramic bracket groups (524.17<!--> <!-->±<!--> <!-->42.78<!--> <!-->N and 441.00<!--> <!-->±<!--> <!-->29.48<!--> <!-->N, 394.17<!--> <!-->±<!--> <!-->46.83<!--> <!-->N, <em>P</em> <!-->=<!--> <!-->0.000, and <em>P</em> <!-->=<!--> <!-->0.003, respectively).</p></div><div><h3>Conclusion</h3><p>ZnONPs (50<!--> <!-->μg/mL)-mediated aPDT effectively inhibited <em>S. mutans</em> biofilm and promoted anti-demineralization without adverse effects on the physico-mechanical properties of the composite resin. These results suggest the potential of this method in preventing white spot lesions during orthodontic treatment.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"22 4","pages":"Article 100901"},"PeriodicalIF":1.8,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142037332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}