International Orthodontics最新文献

{"title":"Treatment effectiveness of young adults using clear aligners versus buccal fixed appliances in class I malocclusion with first premolar extraction using the ABO-Objective Grading System: A randomized controlled clinical trial","authors":"Samer T. Jaber ,&nbsp;Mohammad Y. Hajeer ,&nbsp;Ahmad S. Burhan ,&nbsp;Mohammad Khursheed Alam ,&nbsp;Heba M. Al-Ibrahim","doi":"10.1016/j.ortho.2023.100817","DOIUrl":"10.1016/j.ortho.2023.100817","url":null,"abstract":"<div><h3>Objective</h3><p>To compare the effectiveness of the clear aligners<span><span> with the traditional fixed appliances in the treatment of </span>premolars extraction complex cases using the American Board of Orthodontics Objective Grading System (ABO-OGS).</span></p></div><div><h3>Material and methods</h3><p><span>A single-centre, 2-parallel groups RCT with two arms. Forty severe crowding patients (14 males, 26 females; mean age: 21.40</span> <!-->±<!--> <span>2.42) who required four first premolars extraction were included and randomly allocated into two treatment groups: clear aligners therapy group (CAT), and fixed appliances therapy group (FAT).</span></p><p><span>Cases complexities were measured on pre-treatment records using the Discrepancy index (DI). Post-treatment records were evaluated using the American Board of Orthodontics Objective Grading System (ABO-OGS). Two sample t-tests and Fisher's Exact tests were used to test for significant differences between the two groups. The statistical significance was set at </span><em>P</em> &lt; 0.006 using Bonferroni's correction.</p></div><div><h3>Results</h3><p>For the DI, the mean scores were 32.25 (± 4.33) in the CAT group and 33 (± 7.92) in the FAT group. In the CAT group, the total OGS score ranged between 6–33 points with an average of 17.50(± 7.41), whereas the total score in the FAT group went between 4–30 points with an average of 12.89 (± 6.31) with no significant differences between the two groups (<em>P</em> <!-->=<!--> <!-->0.05). When comparison of the successful cases between the two groups was made, 11 cases received passing scores, and 9 cases received failing scores in the CAT group. Whereas in the FAT group, 17 cases received passing scores, and 3 received a failing score. No statistically significant differences were found in the passing rates between of the CAT and FAT groups (<em>P</em> = 0.421).</p></div><div><h3>Conclusions</h3><p><span>According to the ABO-OGS total scores, there was no significant difference between the clear aligners and fixed appliances in the treatment of class I severe crowding cases with first premolars extraction in young adults. There were no differences between the two techniques in the OGS components scores except for the occlusal contacts, which were significantly better with the fixed appliances. When comparing the number of successful and failed cases between the two groups, no significant differences were noted, with the fixed appliances having a 30% higher success rate than the clear aligners, which must be considered clinically when choosing between these two techniques in the complex </span>orthodontic cases treatment.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100817"},"PeriodicalIF":1.5,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41215606","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 premature loss of primary teeth on prevalence of malocclusion in permanent dentition: A systematic review and meta-analysis","authors":"Prateek Shakti ,&nbsp;Abhinav Singh ,&nbsp;Bharathi M. Purohit ,&nbsp;Abhishek Purohit ,&nbsp;Saumya Taneja","doi":"10.1016/j.ortho.2023.100816","DOIUrl":"10.1016/j.ortho.2023.100816","url":null,"abstract":"<div><h3>Objective</h3><p><span>This systematic review<span> and meta-analysis aimed to assess the effect of premature loss of primary teeth in children of </span></span>mixed dentition<span> age on the prevalence of malocclusion in permanent dentition.</span></p></div><div><h3>Material and methods</h3><p>A search was conducted in Medline through PubMed, Cochrane databases, Google Scholar, and Directory of Open Access Journals (DOAJ) through March 2023. All observational studies that evaluated the association between premature loss of primary teeth and malocclusion in permanent dentition were included for analysis. Quality of studies was evaluated using the Newcastle-Ottawa tool. Meta-analysis was conducted using Cochrane Review Manager (RevMan) Version 5.3. The association between different categories of malocclusion and premature loss of primary teeth was assessed using a random-effects model. Heterogeneity was explored through sensitivity analysis. Certainty of evidence was evaluated using GRADE analysis.</p></div><div><h3>Results</h3><p>This meta-analysis showed that the premature loss of primary teeth significantly increases the prevalence of overall malocclusion in permanent dentition (OR<!--> <!-->=<!--> <!-->2.54, <em>P</em> <!-->=<!--> <!-->0.003; <em>I</em>²: 83%). Subgroup analysis showed an insignificant relationship of premature loss of primary teeth with Class I malocclusion (OR<!--> <!-->=<!--> <!-->1.14, <em>P</em> <!-->=<!--> <!-->0.45; <em>I</em>²<span>: 63%) and Class II malocclusion (OR</span> <!-->=<!--> <!-->1.63, <em>P</em> <!-->=<!--> <!-->0.18; <em>I</em>²<span>: 87%) but statistically significant relationship with Class III malocclusion (OR</span> <!-->=<!--> <!-->3.73, <em>P</em> <!-->=<!--> <!-->0.006; <em>I</em>²: 71%). Sensitivity analysis reflected a significant reduction in <em>I</em>² values.</p></div><div><h3>Conclusion</h3><p>This meta-analysis provides substantial evidence supporting the relationship between premature loss of primary teeth and malocclusion in permanent dentition. Notably, Class III malocclusions exhibited a significant association with premature loss of primary teeth.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100816"},"PeriodicalIF":1.5,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41215605","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":"Stress distribution and displacement with four different types of MARPE on craniofacial complex: A three-dimensional finite element analysis","authors":"Veenita Gupta,&nbsp;Priyank Rai,&nbsp;Tulika Tripathi,&nbsp;Anup Kanase","doi":"10.1016/j.ortho.2023.100813","DOIUrl":"10.1016/j.ortho.2023.100813","url":null,"abstract":"<div><h3>Background</h3><p>Various designs of mini-implants assisted rapid palatal expander (MARPE) appliances can impact treatment effectiveness through their biomechanical effects. The purpose of the study was to study the stress distribution and displacement with four different designs of the MARPE appliance on the craniofacial complex.</p></div><div><h3>Methods</h3><p><span>A 3D finite element model of the craniofacial complex was created from CBCT DICOM data, comprising four distinct groups. Each group consisted of one 4-hole expansion screw positioned between the second premolar<span> and first molar in all models. Group 1 used four single-cortical mini-implants (1.5</span></span> <!-->×<!--> <!-->8<!--> <!-->mm) engaging only the palatal cortex. Group 2 employed four mini-implants (1.5<!--> <!-->×<!--> <!-->11<!--> <!-->mm) engaging both the palatal and nasal cortices. Group 3 had monocortical implants on the palatal slopes, while Group 4 was similar to group 3 with implants in the acrylic wings. Comparisons between groups were made for anchorage (groups 1 and 2), mini-implant position (groups 1 and 3) and surface effect (groups 3 and 4). Von Mises stresses and displacements at various skeletal and dental points were evaluated using ANSYS software.</p></div><div><h3>Results</h3><p>The highest stresses were observed in the maxillary, pterygoid and zygomatic bones, as well as in the mid- palatal suture in all four groups. Downward and forward rotation of the craniofacial complex was noted. Group 2 showed greater skeletal expansion than group 1. Among groups 1 and 3, group 3 showed a better stress distribution. Group 4 showed less dentoalveolar rotation than group 3.</p></div><div><h3>Conclusions</h3><p><span>The MARPE appliances had an impact on the craniofacial complex with stresses on the mid-palatal suture, maxillary bone, pterygoid bones and anterior teeth. Clockwise rotation of the </span>maxilla, zygomatic bones and dentition was noted, while the pterygoid bones and pterygoid suture were displaced backwards. MARPE with bicortical anchorage produces better skeletal expansion. Placing implants on the palatal slopes with acrylic wings results in better skeletal expansion with less clockwise rotation of the dentition.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100813"},"PeriodicalIF":1.5,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41153553","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":"A systematic review with meta-analysis to assess Alzheimer's disease biomarkers in adults with or without obstructive sleep apnoea","authors":"Iman Mohammadi ,&nbsp;Mehrdad Adibparsa ,&nbsp;Amir Najafi ,&nbsp;Mohammad Soroush Sehat ,&nbsp;Masoud Sadeghi","doi":"10.1016/j.ortho.2023.100814","DOIUrl":"10.1016/j.ortho.2023.100814","url":null,"abstract":"<div><h3>Introduction</h3><p><span><span>The aim was to design a meta-analysis evaluating the positron emission tomography (PET) uptake and </span>cerebrospinal fluid (CSF), circulating levels of amyloid-β (Aβ), and </span>tau proteins<span> OSA group versus control group, as well as the association of these biomarkers with the severity of OSA.</span></p></div><div><h3>Material and methods</h3><p>Four databases were searched until April 17, 2023, without any restrictions. The effect sizes were the standardized mean difference (SMD) along with a 95% confidence interval (CI).</p></div><div><h3>Results</h3><p>A total of 21 articles were entered into the meta-analysis. The pooled SMDs of the CSF levels in OSA adults compared to controls were: –0.82 (<em>P</em> <!-->=<!--> <span>0.004) for Aβ42, –1.13 (</span><em>P</em> <!-->&lt;<!--> <!-->0.001) for Aβ40, 0.17 (<em>P</em> <!-->=<!--> <!-->0.23) for p-tau, 0.04 (<em>P</em> <!-->=<!--> <!-->0.65) for t-tau, 0.08 (<em>P</em> <!-->=<!--> <!-->0.89) for Aβ42/Aβ40 ratio, and 0.81 (<em>P</em> <!-->=<!--> <!-->0.001) for t-tau/Aβ42 ratio. The pooled SMD for the PET uptake of Aβ burden in OSA adults compared to controls was 0.30 (<em>P</em> <!-->=<!--> <!-->0.03). The pooled SMDs of the circulating levels in OSA adults compared to controls were: 0.67 (<em>P</em> <!-->=<!--> <!-->0.002) for Aβ42, 0.11 (<em>P</em> <!-->=<!--> <!-->0.82) for Aβ40, 0.35 (<em>P</em> <!-->=<!--> <!-->0.06) for p-tau, and 1.41(<em>P</em> <!-->=<!--> <!-->0.005) for t-tau. The pooled SMDs for levels of Aβ42, Aβ40, total Aβ, p-tau, t-tau, and Aβ42/Aβ40 ratio in severe OSA adults compared to mild/moderate OSA adults were –0.15 (<em>P</em> <!-->=<!--> <!-->0.33), 0.25 (<em>P</em> <!-->=<!--> <!-->35), 0.04 (<em>P</em> <!-->=<!--> <!-->87), –2.53 (<em>P</em> <!-->=<!--> <!-->0.24), –0.24 (<em>P</em> <!-->=<!--> <!-->0.52), and –0.28 (<em>P</em> <!-->=<!--> <!-->0.30), respectively.</p></div><div><h3>Conclusions</h3><p>The results indicated that CSF levels of Aβ42 and Aβ40 in OSA adults were significantly lower, but the CSF level of t-tau/Aβ42 ratio and PET Aβ burden uptake in OSA adults significantly were higher than in controls.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100814"},"PeriodicalIF":1.5,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41153406","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 of tubular coaxial nickel-titanium and copper nickel-titanium orthodontic aligning archwires: A randomized clinical trial","authors":"Reyam M. Noori ,&nbsp;Yassir A. Yassir","doi":"10.1016/j.ortho.2023.100812","DOIUrl":"10.1016/j.ortho.2023.100812","url":null,"abstract":"<div><h3>Background</h3><p>This study aimed to compare tubular coaxial-NiTi and copper-NiTi orthodontic aligning archwires in terms of teeth alignment, patients’ pain perception, and root resorption.</p></div><div><h3>Subjects and methods</h3><p>Orthodontic patients aged 12 years or older, having Little's irregularity index (LII) of 5–9<!--> <!-->mm were randomly allocated to either the copper-NiTi group or tubular coaxial-NiTi group with a 1:1 allocation ratio. The archwire sequence was 0.014-inch followed by 0.018-inch for the copper-NiTi group and 0.016-inch followed by 0.018-inch for the tubular coaxial-NiTi group. Each archwire was left in place for eight weeks before progressing to the next size. Good quality impression for the lower arch before treatment (T0) and thereafter every 4 weeks up to 16 weeks was taken to measure LII. Evaluation of pain perception was performed using a visual analog scale (VAS) during the first week following each archwire insertion. Assessment of root resorption was undertaken at T0 and after 16 weeks by taking periapical radiographs for mandibular central incisors using the long cone paralleling technique.</p></div><div><h3>Results</h3><p>A total of 33 patients were randomized and selected for participation. Of those, 31 patients with a mean age of 15.45<!--> <!-->±<!--> <!-->2.22 who completed the trial were included in the analyses (15 patients in the copper-NiTi group and 16 patients in the tubular coaxial-NiTi group). In both groups, the irregularity index significantly decreased after 16 weeks of treatment with an overall reduction of 5.22<!--> <!-->mm for the copper-NiTi group and 6.03<!--> <!-->mm for the tubular coaxial-NiTi group. However, the difference between the two groups was not statistically significant. Likewise, pain perception and root resorption were not significantly different between the two study groups.</p></div><div><h3>Conclusions</h3><p>Both copper-NiTi and tubular coaxial-NiTi archwires were equally effective in terms of teeth alignment, patients’ pain perception, and root resorption. Consideration could be given to the cost and clinician preference when selecting an initial archwire.</p><p>Registration: the trial was registered in ClinicalTrials.gov on 26/05/2022 with a registration ID: <span>NCT05391542</span><svg><path></path></svg>, <span>https://clinicaltrials.gov/ct2/show/NCT05391542</span><svg><path></path></svg>.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100812"},"PeriodicalIF":1.5,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41160320","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 GUMMETAL® and stainless steel alloy during canine retraction: A pilot split-mouth randomized controlled trial","authors":"Lubomyr Ravlyk,&nbsp;Stephen Warunek,&nbsp;David Covell Jr.,&nbsp;William Tanberg,&nbsp;Thikriat Al-Jewair","doi":"10.1016/j.ortho.2023.100810","DOIUrl":"10.1016/j.ortho.2023.100810","url":null,"abstract":"<div><h3>Objectives</h3><p>A TiNb alloy wire (GUMMETAL® [GM], Toyota Central R&amp;D Labs, Inc., Nagakute, Japan) was recently developed with unique properties for orthodontic<span> applications. This pilot split-mouth randomized controlled trial<span> compared maxillary canine<span> retraction during space closure using sliding mechanics on GM vs. stainless steel (SS) archwires.</span></span></span></p></div><div><h3>Methods</h3><p>Subjects who met the inclusion criteria were treated with fixed appliances and maxillary first-premolar extractions between September 2020 and March 2022. After leveling and aligning, maxillary archwires, fabricated by crimping together segments of 0.016<!--> <!-->×<!--> <!-->0.022” GM and SS archwires, were placed and canine retraction initiated using nickel-titanium coil springs. Digital models of the maxillary arch were superimposed at 0, 4, 8 and 12 weeks and the amount of canine movement (mm), rate of movement (mm/month), and 3-dimensional changes (rotational, vertical extrusion, tip) were measured and compared statistically.</p></div><div><h3>Results</h3><p>Of the 12 subjects recruited, only six completed the study with a median age of 15.8 years (12.0–17.4 years). At 12 weeks, the median canine retraction was 3.41<!--> <!-->mm (IQR: 2.10, 4.76) with GM versus 3.71<!--> <!-->mm (IQR: 1.62, 6.45) with SS. The retraction rate was 1.14<!--> <!-->mm/month (IQR: 0.69, 1.59) with GM, versus 1.24<!--> <!-->mm/month (IQR: 0.54, 2.15) with SS. The median rotational, vertical and tip changes of the canine were 7.90̊, 0.59<!--> <!-->mm and 6.15̊ with GM, and 7.25̊, 0.29<!--> <!-->mm and 2.05̊ with SS. Intergroup differences with all measurements were not statistically significant.</p></div><div><h3>Conclusion</h3><p>No significant differences were found between GM and SS during maxillary canine retraction. GM demonstrated clinical potential for space closure mechanics, however, future larger studies are needed.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100810"},"PeriodicalIF":1.5,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41152653","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":"The effect of different concentration of emodin nanoparticles, as an antibacterial agent, on the flexural resistance of acrylic resin used in orthodontics: An in vitro study","authors":"Rashin Bahrami ,&nbsp;Ahmad Sodagar ,&nbsp;Maryam Pourhajibagher ,&nbsp;Amir Hossein Mirhashemi","doi":"10.1016/j.ortho.2023.100811","DOIUrl":"10.1016/j.ortho.2023.100811","url":null,"abstract":"<div><h3>Objective</h3><p><span><span>The aim of this study was to investigate the impact of emodin </span>nanoparticles<span> (n-Emo) on the flexural strength of acrylic resin used in </span></span>orthodontics.</p></div><div><h3>Methods</h3><p>A total of 24 acrylic resin discs were prepared according to ISO:20795-1 and divided into four groups (<em>n</em> <!-->=<!--> <!-->6): 0% n-Emo, 0.5% n-Emo, 1% n-Emo, and 2% n-Emo. The flexural strength of each group was measured using the Universal Testing Machine. One-way analysis of variance (ANOVA) and Tukey tests were used to analyse the data.</p></div><div><h3>Results</h3><p>The highest flexural strength values were observed in the groups containing 0% and 0.5% concentrations of n-Emo, while the lowest mean flexural strength was recorded in the group containing 2% concentration of n-Emo. There were significant difference in flexural strength values between the groups containing 0% with those containing 1% and 2% concentrations (<em>P</em> <!-->=<!--> <!-->0.045, <em>P</em> <!-->=<!--> <!-->0.011, respectively), as well as between those containing 0.5% and 2% concentrations of n-Emo (<em>P</em> <!-->=<!--> <!-->0.041).</p></div><div><h3>Conclusions</h3><p><span>The results of the study showed that the incorporation of n-Emo had a negative impact on the flexural strength of the acrylic resin utilized in orthodontics. Nonetheless, the mean flexural strength values of all groups fell within the normal range, implying that the addition of n-Emo did not jeopardize the mechanical properties of the acrylic resin. It is therefore conceivable that the use of n-Emo as an antimicrobial agent in acrylic resin could be a promising approach to reducing enamel </span>demineralisation and dental caries, while preserving its mechanical properties.</p><p>This study was approved by the ethics committee of the Tehran University of Medical Sciences (1401-2-398-54892).</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 4","pages":"Article 100811"},"PeriodicalIF":1.5,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41133263","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":"Alveolar bone loss and root resorption in mesialized second molars in mandibular first molar extraction cases as compared to contralateral non-extraction side in young adults: A retrospective cross-sectional study","authors":"Muhammad Aman,&nbsp;Waqar Jeelani,&nbsp;Maheen Ahmed,&nbsp;Ahsan Khalid","doi":"10.1016/j.ortho.2023.100774","DOIUrl":"10.1016/j.ortho.2023.100774","url":null,"abstract":"<div><h3>Introduction</h3><p><span>The alveolar bone loss<span> (ABL) and external apical root resorption (EARR) depict the safety of mesialization of </span></span>mandibular second molars<span><span> into the extraction space of mandibular first molars<span><span>. The aim of this study was to evaluate the ABL and EARR after closure of mandibular first molar extraction space by mesialization of </span>second molar on extraction side (ES) as compared to the </span></span>contralateral non-extraction side (NES).</span></p></div><div><h3>Material and methods</h3><p><span>A retrospective cross-sectional study was carried out using the pre and posttreatment orthodontic<span><span> records of young adults with complete set of permanent dentitions treated with extraction of unilateral mandibular first molar and non-extraction treatment on the contralateral side. All patients underwent mini-implant supported mesialization of second molar on ES. The ABL and EARR of second molar on ES and contralateral NES were measured on digital </span>orthopantomograms. The ABL and EARR of second molars on ES and contralateral NES were compared using independent sample </span></span><em>t</em>-test.</p></div><div><h3>Results</h3><p>A total of 36 subjects (14 males and 22 females) were included in the study. The mean treatment duration for molar mesialization was 28.75<!--> <!-->±<!--> <!-->8.05<!--> <!-->months. The mean crown and root movements of mandibular second molar on ES were 10.94<!--> <!-->±<!--> <!-->1.25<!--> <!-->mm and 9.04<!--> <!-->mm<!--> <!-->±<!--> <!-->1.14<!--> <!-->mm, as compared to 0.91<!--> <!-->±<!--> <!-->1.01<!--> <!-->mm and 0.77<!--> <!-->±<!--> <!-->0.83<!--> <!-->mm on contralateral NES, respectively. The mean ABL and EARR at mandibular second molar were found to be significantly greater on the ES than the contralateral NES (<em>P</em> <!-->&lt;<!--> <!-->0.001 and<!--> <!-->&lt;<!--> <!-->0.05, respectively). A total of seven patients (19.4%) experienced ABL<!--> <!-->≥<!--> <!-->1<!--> <!-->mm on ES as compared to none in the contralateral NES. EARR of<!--> <!-->&gt;<!--> <!-->2<!--> <!-->mm of at least one root was found in seven patients (19.4%) in ES as compared to four (11%) in contralateral NES.</p></div><div><h3>Conclusion</h3><p>There was small but statistically significant difference in the ABL and EARR of mesialized mandibular second molar at first molar ES as compared to the contralateral NES. For majority of patients this difference was small but few isolated cases experienced severe ABL and EARR.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 3","pages":"Article 100774"},"PeriodicalIF":1.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9940730","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 incorporating silica-hydroxyapatite-silver hybrid nanoparticles into the resin-modified glass ionomer on the adhesive remnant index score and shear bond strength of orthodontic metal brackets: An in vitro study","authors":"Nazila Biglar ,&nbsp;Elahe Chaychi Raghimi ,&nbsp;Somayeh Sadighian ,&nbsp;Farzaneh Karamitanha ,&nbsp;Elham Zajkani ,&nbsp;Azin Nourian","doi":"10.1016/j.ortho.2023.100761","DOIUrl":"10.1016/j.ortho.2023.100761","url":null,"abstract":"<div><h3>Objectives</h3><p><span>This study aimed to assess the effect of addition of silica-hydroxyapatite-silver (Si-HA-Ag) hybrid nanoparticles to light-cure </span>glass ionomer (GI) on shear bond strength (SBS) of metal brackets bonded with this adhesive and the adhesive remnant index (ARI) score.</p></div><div><h3>Material and methods</h3><p><span>In this in vitro experimental study, 50 sound extracted premolars were assigned to 5 groups (</span><em>n</em> <!-->=<!--> <span>10) for orthodontic metal bracket bonding with BracePaste® composite, Fuji ORTHO™ pure resin modified GI (RMGI), and RMGI reinforced with 2wt%, 5wt% and 10wt% Si-HA-Ag nanoparticles. The SBS of brackets was measured by a universal testing machine. Debonded specimens were inspected under a stereomicroscope at</span> <!-->×<!--> <span>10 magnification to determine the ARI score. Data were analyzed by one-way ANOVA, Scheffe test, Chi-square test, and Fisher's exact test (alpha</span> <!-->=<!--> <!-->0.05).</p></div><div><h3>Results</h3><p>The maximum mean SBS was recorded in BracePaste® composite followed by 2% RMGI, 0% RMGI, 5% RMGI and 10% RMGI. Only the difference between the BracePaste® composite and 10% RMGI was significant in this regard (<em>P</em> <!-->=<!--> <!-->0.006). The groups were not significantly different regarding the ARI scores (<em>P</em> <!-->=<!--> <!-->0.665). All the SBS values were within the clinically acceptable range.</p></div><div><h3>Conclusion</h3><p>Addition of 2wt% and 5wt% Si-HA-Ag hybrid nanoparticles to RMGI as orthodontic adhesive caused no significant change in SBS of orthodontic metal brackets while addition of 10wt% hybrid nanoparticles significantly decreased the SBS. Nonetheless, all the SBS values were within the clinically acceptable range. Addition of hybrid nanoparticles had no significant effect on the ARI score.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 3","pages":"Article 100761"},"PeriodicalIF":1.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9943780","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":"Relationship between the amount of mesial movement of the mandibular first molar and angular changes of the mandibular third molar: A retrospective comparative study in growing patients with and without first premolar extraction","authors":"Fatemeh Azizi ,&nbsp;Ali Naghib Zadeh ,&nbsp;Amin Golshah ,&nbsp;Mohammad Moslem Imani ,&nbsp;Roya Safari-Faramani","doi":"10.1016/j.ortho.2023.100779","DOIUrl":"10.1016/j.ortho.2023.100779","url":null,"abstract":"<div><h3>Objectives</h3><p><span>The main objective of this study was to assess the relationship of the amount of mesial movement of mandibular first molar<span> (MFM) and angular changes of the mandibular third molar (MTM) in </span></span>orthodontic patients. The secondary objective of this study was to compare the obtained values in extraction and non-extraction orthodontic patients.</p></div><div><h3>Material and methods</h3><p><span>In this cross-sectional retrospective study were enrolled all the eligible patients (12–16 years) with and without first premolar extraction that met the inclusion criteria. The angle between the longitudinal axis of MTM and horizontal reference plane (HRP) (to calculate the angular change of MTM), and the distance between the </span>cementoenamel junction<span><span> of the mesial surface of MFM and the bisector of the anterior nasal spine and nasal septum (to determine the amount of mesial movement of MFM) were measured on pre- and post-treatment </span>panoramic radiographs. The correlation between the two variables was analysed and compared between extraction and non-extraction patients using STATA v. 14.2 software.</span></p></div><div><h3>Results</h3><p>A total of 100 fixed orthodontic patients with and without first premolar extraction (<em>n</em> <!-->=<!--> <!-->50) whose treatment had been accomplished were included in the study. In the non-extraction group, the mean amount of mesial movement of MFM was 1.45<!--> <!-->mm and the mean angular change of MTM was 4.28 degrees; this correlation was significant (<em>P</em> <!-->&lt;<!--> <!-->0.05). These values were 2.98<!--> <!-->mm and 7.17 degrees in the first premolar extraction group, respectively, with a significant correlation (<em>P</em> <!-->&lt;<!--> <!-->0.05). However, the difference in this respect was not significant between the two groups (<em>P</em> <!-->&gt;<!--> <!-->0.05). According to the regression model, 1<!--> <!-->mm mesial movement of MFM would averagely cause 2.2-degree angular change in MTM, adjusting for the effect of extraction/non-extraction treatment plan.</p></div><div><h3>Conclusion</h3><p>The mesial movement of MFM was significantly correlated with the angular changes of MTM in extraction and non-extraction orthodontic patients, with no significant difference between them.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 3","pages":"Article 100779"},"PeriodicalIF":1.5,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9997512","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}