Pub Date : 2020-07-19DOI: 10.1080/13440241.2020.1791649
Fumihiko Nakamura, N. Sakai, N. Sako, W. Tome, N. Kitai
ABSTRACT Purpose The purpose of the present study was to investigate the degree of overjet deemed by subjects without dental education as needing orthodontic treatment, to determine whether dental education influences the perception of overjet, and to determine whether the degree of overjet considered to require orthodontic treatment changes after subjects acquire dental education. Materials and methods Ninety-six women in their first year immediately after entering a school for dental hygienists (first-year group), 34 women in their third year of education (third-year group), and 14 orthodontists (5 men and 9 women; Orthodontist group) were included. Follow-up investigation for the first-year group was conducted after they entered their third year. The dental models had varying overjet from −2.0 mm to +7.0 mm with differences of 1.0 mm each. The models were shown to each subject in random order, and each subject was asked to determine whether or not the models required orthodontic treatment. Results The ratio of subjects in whom orthodontic treatment was deemed to be necessary for overjet of 4.0 and 5.0 mm was significantly higher in the Orthodontist group than in the first- and third-year group, respectively. The ratio of subjects who deemed orthodontic treatment necessary for overjet of 0.0 mm in the third-year group was significantly higher than that in the first-year group both in the cross-sectional and longitudinal data. Conclusions The dental education does appear to influence the perception of edge-to-edge occlusion.
{"title":"Influence of dental education on the perception of overjet","authors":"Fumihiko Nakamura, N. Sakai, N. Sako, W. Tome, N. Kitai","doi":"10.1080/13440241.2020.1791649","DOIUrl":"https://doi.org/10.1080/13440241.2020.1791649","url":null,"abstract":"ABSTRACT Purpose The purpose of the present study was to investigate the degree of overjet deemed by subjects without dental education as needing orthodontic treatment, to determine whether dental education influences the perception of overjet, and to determine whether the degree of overjet considered to require orthodontic treatment changes after subjects acquire dental education. Materials and methods Ninety-six women in their first year immediately after entering a school for dental hygienists (first-year group), 34 women in their third year of education (third-year group), and 14 orthodontists (5 men and 9 women; Orthodontist group) were included. Follow-up investigation for the first-year group was conducted after they entered their third year. The dental models had varying overjet from −2.0 mm to +7.0 mm with differences of 1.0 mm each. The models were shown to each subject in random order, and each subject was asked to determine whether or not the models required orthodontic treatment. Results The ratio of subjects in whom orthodontic treatment was deemed to be necessary for overjet of 4.0 and 5.0 mm was significantly higher in the Orthodontist group than in the first- and third-year group, respectively. The ratio of subjects who deemed orthodontic treatment necessary for overjet of 0.0 mm in the third-year group was significantly higher than that in the first-year group both in the cross-sectional and longitudinal data. Conclusions The dental education does appear to influence the perception of edge-to-edge occlusion.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"89 - 94"},"PeriodicalIF":0.4,"publicationDate":"2020-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1791649","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43546934","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}
Pub Date : 2020-06-17DOI: 10.1080/13440241.2020.1777798
Parastoo Namdar, Erfan Bardideh, Farzaneh Lal Alizadeh, A. Jahanbin, N. Eslami
ABSTRACT Objectives This systematic review aimed to critically evaluate the available evidence on the use of MBT and Roth prescriptions as fixed orthodontic appliances. Search methods Following the seven stage recommended in the Cochrane Handbook, this systematic review was conducted by searching five electronic databases, including Google scholar, PubMed, Cochrane Database of Abstracts of Reviews of Effects, Cochrane Central Register of Controlled Trials, ISI Web of Science and Scopus from the beginning to 2020 were searched. The reference lists of the related studies were also hand searched. Results The search process resulted in the identification of 107 papers, 104 and 3 cases of which were obtained through electronic and manual searches, respectively. After the removal of the duplicates and unrelated articles in the initial screening, 91 studies were remained to be screened based on inclusion and exclusion criteria. The second screening led to the inclusion of nine papers in the study. Conclusion Our systematic review was indicative of the lack of sufficient information regarding the efficiency of MBT and Roth prescriptions to support the evidence-based clinical use of one of these prescriptions for fixed orthodontic appliances.
目的:本系统综述旨在批判性地评估MBT和Roth处方作为固定正畸矫治器的可用证据。按照Cochrane手册推荐的7个阶段，本系统综述通过检索谷歌scholar、PubMed、Cochrane Effects Reviews Abstracts Database、Cochrane Central Register of Controlled Trials、ISI Web of Science和Scopus 5个电子数据库进行，检索时间从年初到2020年。同时手工检索相关研究的参考文献表。结果检索过程中共鉴定论文107篇，其中电子检索104篇，人工检索3篇。在初始筛选中剔除重复和不相关的文章后，根据纳入和排除标准，仍有91项研究有待筛选。第二次筛选导致九篇论文被纳入研究。结论我们的系统综述表明，缺乏足够的关于MBT和Roth处方的有效性的信息，以支持其中一种处方用于固定正畸矫治器的循证临床应用。
{"title":"Comparison of Roth and McLaughlin-Bennet-Trevisi prescriptions as two popular pre-adjusted orthodontic bracket systems: a systematic review","authors":"Parastoo Namdar, Erfan Bardideh, Farzaneh Lal Alizadeh, A. Jahanbin, N. Eslami","doi":"10.1080/13440241.2020.1777798","DOIUrl":"https://doi.org/10.1080/13440241.2020.1777798","url":null,"abstract":"ABSTRACT Objectives This systematic review aimed to critically evaluate the available evidence on the use of MBT and Roth prescriptions as fixed orthodontic appliances. Search methods Following the seven stage recommended in the Cochrane Handbook, this systematic review was conducted by searching five electronic databases, including Google scholar, PubMed, Cochrane Database of Abstracts of Reviews of Effects, Cochrane Central Register of Controlled Trials, ISI Web of Science and Scopus from the beginning to 2020 were searched. The reference lists of the related studies were also hand searched. Results The search process resulted in the identification of 107 papers, 104 and 3 cases of which were obtained through electronic and manual searches, respectively. After the removal of the duplicates and unrelated articles in the initial screening, 91 studies were remained to be screened based on inclusion and exclusion criteria. The second screening led to the inclusion of nine papers in the study. Conclusion Our systematic review was indicative of the lack of sufficient information regarding the efficiency of MBT and Roth prescriptions to support the evidence-based clinical use of one of these prescriptions for fixed orthodontic appliances.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"65 - 75"},"PeriodicalIF":0.4,"publicationDate":"2020-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1777798","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43429665","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}
Pub Date : 2020-06-05DOI: 10.1080/13440241.2020.1770558
S. Yamaoka, R. Hamanaka, T. Nguyen, Sachio Jinnai, Junya Tominaga, Y. Koga, N. Yoshida
ABSTRACT Purpose: The aim of this study was to clarify the mechanical conditions of loop activation that produce the optimal force system allowing controlled movement of the anterior teeth. Materials and Methods: The closing loop examined in this study was a 10-mm-high teardrop type bent from a 0.017 × 0.025-inch stainless steel archwire. A loop design that can generate a high moment-to-force (M/F) ratio and the optimal force magnitude was investigated by varying the rate of the cross-sectional reduction of the loop apex, the amount of loop activation and the degree of gable bend. Forces and moments acting on closing loops were calculated using structural analysis based on the tangent stiffness method. Results: A force magnitude of 302 g and an M/F ratio higher than 10 (sufficiently high to achieve bodily movement of the anterior teeth) could be produced when the thickness of the cross-section of a 10-mm-high teardrop loop was reduced by half for a distance of 3 mm from the apex and a gable bend of 30° was incorporated into the loop. Conclusions: The optimal force magnitude and M/F ratio for achieving controlled tipping or bodily movement of the anterior teeth can be produced by partially reducing the thickness of the teardrop loop, and by placing a gable bend of 20° to 30° in the 0.018-inch bracket slot system.
{"title":"A novel and simple design of the closing loop producing optimal force magnitude and moment-to-force ratio for en-masse retraction of anterior teeth","authors":"S. Yamaoka, R. Hamanaka, T. Nguyen, Sachio Jinnai, Junya Tominaga, Y. Koga, N. Yoshida","doi":"10.1080/13440241.2020.1770558","DOIUrl":"https://doi.org/10.1080/13440241.2020.1770558","url":null,"abstract":"ABSTRACT Purpose: The aim of this study was to clarify the mechanical conditions of loop activation that produce the optimal force system allowing controlled movement of the anterior teeth. Materials and Methods: The closing loop examined in this study was a 10-mm-high teardrop type bent from a 0.017 × 0.025-inch stainless steel archwire. A loop design that can generate a high moment-to-force (M/F) ratio and the optimal force magnitude was investigated by varying the rate of the cross-sectional reduction of the loop apex, the amount of loop activation and the degree of gable bend. Forces and moments acting on closing loops were calculated using structural analysis based on the tangent stiffness method. Results: A force magnitude of 302 g and an M/F ratio higher than 10 (sufficiently high to achieve bodily movement of the anterior teeth) could be produced when the thickness of the cross-section of a 10-mm-high teardrop loop was reduced by half for a distance of 3 mm from the apex and a gable bend of 30° was incorporated into the loop. Conclusions: The optimal force magnitude and M/F ratio for achieving controlled tipping or bodily movement of the anterior teeth can be produced by partially reducing the thickness of the teardrop loop, and by placing a gable bend of 20° to 30° in the 0.018-inch bracket slot system.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"77 - 82"},"PeriodicalIF":0.4,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1770558","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48243310","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}
Pub Date : 2020-06-03DOI: 10.1080/13440241.2020.1770561
M. Hamid, A. Abuaffan
ABSTRACT Purpose To establish standards for Arnett’s STCA in a sample of Sudanese adults and compare them to other populations. Materials and Methods A hundred and six lateral cephalograms of Sudanese adults (55 females and 51 males) aged 18-25 years with a mean of 22.8 years were analysed using Arnett’s STCA. Results When compared to Caucasians Sudanese adults had statistically significant more proclined upper and lower incisors in relation to their occlusal planes, more protrusive upper and lower lips, obtuse maxillary occlusal plane angle, thicker upper and lower lips and increased TVL projection to B’ and Pog’ points. In addition, males had thicker lips, more proclined lower incisors and longer upper lips than females. Conclusion There are remarkable differences in the soft tissue norms results between Sudanese adults and Caucasians and also between Sudanese and other populations These variations are most likely to be due to racial and genetic background differences among various populations and must be taken into consideration during diagnosis and orthodontic treatment planning.
{"title":"Soft tissues cephalometric norms for a sample of Sudanese adults. Part II: Arnett’s analysis","authors":"M. Hamid, A. Abuaffan","doi":"10.1080/13440241.2020.1770561","DOIUrl":"https://doi.org/10.1080/13440241.2020.1770561","url":null,"abstract":"ABSTRACT Purpose To establish standards for Arnett’s STCA in a sample of Sudanese adults and compare them to other populations. Materials and Methods A hundred and six lateral cephalograms of Sudanese adults (55 females and 51 males) aged 18-25 years with a mean of 22.8 years were analysed using Arnett’s STCA. Results When compared to Caucasians Sudanese adults had statistically significant more proclined upper and lower incisors in relation to their occlusal planes, more protrusive upper and lower lips, obtuse maxillary occlusal plane angle, thicker upper and lower lips and increased TVL projection to B’ and Pog’ points. In addition, males had thicker lips, more proclined lower incisors and longer upper lips than females. Conclusion There are remarkable differences in the soft tissue norms results between Sudanese adults and Caucasians and also between Sudanese and other populations These variations are most likely to be due to racial and genetic background differences among various populations and must be taken into consideration during diagnosis and orthodontic treatment planning.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"83 - 88"},"PeriodicalIF":0.4,"publicationDate":"2020-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1770561","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45491572","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}
Pub Date : 2020-04-20DOI: 10.1080/13440241.2020.1751456
A. Oka, H. Kurosaka, K. Nakatsugawa, T. Yamashiro
ABSTRACT Purpose: Cleft lip and/or palate (CLP) is one of the most frequent craniofacial defects that could happen in 1/500 to 1/1000 live birth depending on different racial background. Among different patterns of facial cleft, complete bilateral cleft lip and palate (BCLP) is one of the most challenging cases for orthodontic and surgeons because of their deformed maxillary dental arch and severe skeletal discrepancy. It is also well known that CLP could occur as part of the phenotype in certain congenital diseases. However, from its extremely diversified phenotypic combination, some of the cases that we encounter remains difficult to diagnose. From these reasons, it is important to continuously report the outcome of orthodontic treatment in such cases which exhibit syndromic phenotypes with CLP.Material and Methods: In the present case report, an 18-year-old man with complete bilateral cleft lip and palate, skeletal Class III and open-bite with maxillary constriction, in addition to hypospadias, bubonocele, opisthotonus, and hypertonia was treated with edgewise appliance therapy combined with orthognathic surgery. The treatment began with surgically assisted rapid palatal expansion (SARPE) in anteroposterior and transverse dimensions with a three-way expander to increase the maxillary anteroposterior length and width. After the expansion, the patient underwent Le Fort I osteotomy and bilateral sagittal split osteotomy to correct skeletal Class III and open bite.Results and Conclusion: At the end of the surgical and orthodontic treatments, functional occlusion and an improved facial profile were achieved. We also discuss his diverse general phenotype due to his congenital disease.
摘要目的：唇腭裂（CLP）是最常见的颅面缺陷之一，根据不同的种族背景，1/500至1/1000的活产婴儿可能会出现这种缺陷。在不同类型的面裂中，完全性双侧唇腭裂（BCLP）是正畸和外科医生最具挑战性的病例之一，因为其上颌骨牙弓变形和严重的骨骼差异。众所周知，CLP可能作为某些先天性疾病表型的一部分发生。然而，从其极其多样化的表型组合来看，我们遇到的一些病例仍然难以诊断。由于这些原因，对于表现出CLP综合征表型的病例，持续报告正畸治疗的结果是很重要的。材料和方法：在本病例报告中，一名18岁的男性患有完全性双侧唇腭裂，骨骼III级，开放性咬合伴有上颌骨收缩，此外还有尿道下裂、淋巴腺膨出、，采用边缘矫治器结合正颌手术治疗强直性脊柱炎。治疗开始于手术辅助的前后和横向快速腭扩张（SARPE），使用三向扩张器增加上颌前后长度和宽度。扩张术后，患者接受了Le Fort I截骨和双侧矢状劈开截骨，以矫正骨骼III级和开放性咬合。结果和结论：在手术和正畸治疗结束时，实现了功能性咬合和面部轮廓的改善。我们还讨论了由于先天性疾病导致的他多样化的一般表型。
{"title":"Surgical and orthodontic approach for a patient with a severely constricted maxillary arch caused by bilateral cleft lip and palate","authors":"A. Oka, H. Kurosaka, K. Nakatsugawa, T. Yamashiro","doi":"10.1080/13440241.2020.1751456","DOIUrl":"https://doi.org/10.1080/13440241.2020.1751456","url":null,"abstract":"ABSTRACT Purpose: Cleft lip and/or palate (CLP) is one of the most frequent craniofacial defects that could happen in 1/500 to 1/1000 live birth depending on different racial background. Among different patterns of facial cleft, complete bilateral cleft lip and palate (BCLP) is one of the most challenging cases for orthodontic and surgeons because of their deformed maxillary dental arch and severe skeletal discrepancy. It is also well known that CLP could occur as part of the phenotype in certain congenital diseases. However, from its extremely diversified phenotypic combination, some of the cases that we encounter remains difficult to diagnose. From these reasons, it is important to continuously report the outcome of orthodontic treatment in such cases which exhibit syndromic phenotypes with CLP.Material and Methods: In the present case report, an 18-year-old man with complete bilateral cleft lip and palate, skeletal Class III and open-bite with maxillary constriction, in addition to hypospadias, bubonocele, opisthotonus, and hypertonia was treated with edgewise appliance therapy combined with orthognathic surgery. The treatment began with surgically assisted rapid palatal expansion (SARPE) in anteroposterior and transverse dimensions with a three-way expander to increase the maxillary anteroposterior length and width. After the expansion, the patient underwent Le Fort I osteotomy and bilateral sagittal split osteotomy to correct skeletal Class III and open bite.Results and Conclusion: At the end of the surgical and orthodontic treatments, functional occlusion and an improved facial profile were achieved. We also discuss his diverse general phenotype due to his congenital disease.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"127 - 134"},"PeriodicalIF":0.4,"publicationDate":"2020-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1751456","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47271121","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}
Pub Date : 2020-02-27DOI: 10.1080/13440241.2020.1736784
M. Hamid, A. Abuaffan
ABSTRACT Purpose: To establish soft tissues cephalometric norms for orthognathic surgery in a sample of Sudanese adults. Materials and Methods: A total of 106 lateral cephalograms of Sudanese adults (55 females and 51 males) aged between 18 and 25 years (mean 22.8 years) were manually traced and analysed using Legan and Burstone Cephalometric analysis for orthognathic Surgery (COGS). Results: Sudanese sample, in comparison to Caucasian, had a more convex profile with larger angle of convexity and more prognathic maxillae, obtuse lower face-throat angle, more acute nasolabial angle, protrusive upper and lower lips with deeper labiomental sulci and greater maxillary incisors exposure with larger interlabial gap. Males had greater maxillary and mandibular prognathism, more obtuse lower face-throat angle and vertical height depth ratio than females. Females had larger vertical lip chin ratio, maxillary incisor exposure and interlabial gap. Conclusion: Considerable differences between the soft tissue profile configuration of Sudanese and Caucasian adults exist and also between Sudanese and other populations. These variations should be taken into account during diagnosis and treatment planning of orthognathic surgery.
{"title":"Soft tissues cephalometric norms for a sample of Sudanese adults. Part I: Legan and Burstone analysis","authors":"M. Hamid, A. Abuaffan","doi":"10.1080/13440241.2020.1736784","DOIUrl":"https://doi.org/10.1080/13440241.2020.1736784","url":null,"abstract":"ABSTRACT Purpose: To establish soft tissues cephalometric norms for orthognathic surgery in a sample of Sudanese adults. Materials and Methods: A total of 106 lateral cephalograms of Sudanese adults (55 females and 51 males) aged between 18 and 25 years (mean 22.8 years) were manually traced and analysed using Legan and Burstone Cephalometric analysis for orthognathic Surgery (COGS). Results: Sudanese sample, in comparison to Caucasian, had a more convex profile with larger angle of convexity and more prognathic maxillae, obtuse lower face-throat angle, more acute nasolabial angle, protrusive upper and lower lips with deeper labiomental sulci and greater maxillary incisors exposure with larger interlabial gap. Males had greater maxillary and mandibular prognathism, more obtuse lower face-throat angle and vertical height depth ratio than females. Females had larger vertical lip chin ratio, maxillary incisor exposure and interlabial gap. Conclusion: Considerable differences between the soft tissue profile configuration of Sudanese and Caucasian adults exist and also between Sudanese and other populations. These variations should be taken into account during diagnosis and treatment planning of orthognathic surgery.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"49 - 55"},"PeriodicalIF":0.4,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1736784","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45756311","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}
Pub Date : 2020-02-27DOI: 10.1080/13440241.2020.1733297
Zhihui Wang, S. Obamiyi, S. Malik, P. Rossouw, R. Tallents, D. Michelogiannakis
ABSTRACT Purpose:The aim of the present systematic review was to assess the association between maxillary expansion (ME) and changes in condylar position in growing patients, including patients with functional unilateral posterior crossbite (FUPC), patients with bilateral posterior crossbite (BPC) and patients who have maxillary transverse deficiency (MTD) without posterior crossbite (PC). Materials and methods: Indexed databases were searched up to March 2019, and the following eligibility criteria were imposed: (a) original clinical studies; (b) growing patients; (c) intervention: influence of ME on condylar position; (d) radiographic evaluation of condylar position before and after ME; and (e) statistical analysis. Experimental studies, historic reviews, case reports, cases-series, letters to the Editor, commentaries, studies that did not specify the type of posterior crossbite (PC), studies that included combined ME-facemask intervention, and studies in adult patients were excluded. Quality assessment was performed using the Methodological Index for Non-Randomized Studies (MINORS) guidelines. Results:Eleven clinical studies were selected for data extraction. In 3 studies, significant changes in condylar position were observed bilaterally with ME in patients with FUPC. One study showed significant changes in condylar position with ME only in the non-crossbite sides; and 2 studies found no significant changes in condylar position with ME in patients with FUPC. One study reported significant changes in condylar position in both sides with ME in patients with bilateral PC. In patients without PC, 1 study showed significant changes in condylar position bilaterally with ME; and 2 studies reported no significant changes in condylar position. The mean MINORS score was 13.8 2.89 (out of 24). Conclusion:The association between ME and changes in condylar position in growing patients remains debatable.
{"title":"Changes in condylar position with maxillary expansion in growing patients. A systematic review of clinical studies","authors":"Zhihui Wang, S. Obamiyi, S. Malik, P. Rossouw, R. Tallents, D. Michelogiannakis","doi":"10.1080/13440241.2020.1733297","DOIUrl":"https://doi.org/10.1080/13440241.2020.1733297","url":null,"abstract":"ABSTRACT Purpose:The aim of the present systematic review was to assess the association between maxillary expansion (ME) and changes in condylar position in growing patients, including patients with functional unilateral posterior crossbite (FUPC), patients with bilateral posterior crossbite (BPC) and patients who have maxillary transverse deficiency (MTD) without posterior crossbite (PC). Materials and methods: Indexed databases were searched up to March 2019, and the following eligibility criteria were imposed: (a) original clinical studies; (b) growing patients; (c) intervention: influence of ME on condylar position; (d) radiographic evaluation of condylar position before and after ME; and (e) statistical analysis. Experimental studies, historic reviews, case reports, cases-series, letters to the Editor, commentaries, studies that did not specify the type of posterior crossbite (PC), studies that included combined ME-facemask intervention, and studies in adult patients were excluded. Quality assessment was performed using the Methodological Index for Non-Randomized Studies (MINORS) guidelines. Results:Eleven clinical studies were selected for data extraction. In 3 studies, significant changes in condylar position were observed bilaterally with ME in patients with FUPC. One study showed significant changes in condylar position with ME only in the non-crossbite sides; and 2 studies found no significant changes in condylar position with ME in patients with FUPC. One study reported significant changes in condylar position in both sides with ME in patients with bilateral PC. In patients without PC, 1 study showed significant changes in condylar position bilaterally with ME; and 2 studies reported no significant changes in condylar position. The mean MINORS score was 13.8 2.89 (out of 24). Conclusion:The association between ME and changes in condylar position in growing patients remains debatable.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"1 - 10"},"PeriodicalIF":0.4,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1733297","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41558446","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}
Pub Date : 2020-02-27DOI: 10.1080/13440241.2020.1741070
H. Kono, M. Kikuchi
ABSTRACT Purpose: This study aims to analyse the springback behaviour of commercial orthodontic wires. Materials and methods: The relationship between the predetermined bending angle (x) and the obtained bent angle (y) of commercial stainless steel (SS) and cobalt-chromium alloy (Co-Cr) orthodontic round wires was analysed. The springback value was calculated from the difference between the two angles (x – y). Results: The springback value became larger when (1) the SS wire was used instead of Co-Cr wire, (2) the wire diameter was small, and (3) the curvature radius was large. The relationship can be adequately represented by a linear function in the form of y = ax + b (R 2 > 0.98). Conclusion: By calculating the inverse of the function, i.e. x = (y – b)/a, the necessary bending angle (x) for the desired bent angle (y) can be calculated in advance, thereby obtaining the desired angle in a single bending action. Analysis of the springback property of the orthodontic wire and utilization of the linear function between x and y for a particular shape and composition of wire can help improve accuracy in wire bending.
{"title":"Analysis of orthodontic wire springback to simplify wire bending","authors":"H. Kono, M. Kikuchi","doi":"10.1080/13440241.2020.1741070","DOIUrl":"https://doi.org/10.1080/13440241.2020.1741070","url":null,"abstract":"ABSTRACT Purpose: This study aims to analyse the springback behaviour of commercial orthodontic wires. Materials and methods: The relationship between the predetermined bending angle (x) and the obtained bent angle (y) of commercial stainless steel (SS) and cobalt-chromium alloy (Co-Cr) orthodontic round wires was analysed. The springback value was calculated from the difference between the two angles (x – y). Results: The springback value became larger when (1) the SS wire was used instead of Co-Cr wire, (2) the wire diameter was small, and (3) the curvature radius was large. The relationship can be adequately represented by a linear function in the form of y = ax + b (R 2 > 0.98). Conclusion: By calculating the inverse of the function, i.e. x = (y – b)/a, the necessary bending angle (x) for the desired bent angle (y) can be calculated in advance, thereby obtaining the desired angle in a single bending action. Analysis of the springback property of the orthodontic wire and utilization of the linear function between x and y for a particular shape and composition of wire can help improve accuracy in wire bending.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"57 - 63"},"PeriodicalIF":0.4,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1741070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43209205","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}
Pub Date : 2020-02-27DOI: 10.1080/13440241.2020.1733180
Akihiro Koyama, T. Ono, M. Uo, Hajime Kiyokawa, Nobutaka Ohira, Y. Shima, Z. Kanno
ABSTRACT Purpose: During orthodontic treatment, it is important to ensure that the least frictional force is applied to the teeth to ensure optimal tooth movement. We applied electrolytic rhodium-polytetrafluoroethylene (Rh-PTFE) composite plating to stainless steel (SS) orthodontic wires with the aim of suppressing friction and corrosion in the wire and facilitating the longevity of treatment. Materials and methods: SS orthodontic wires were plated with a polytetrafluoroethylene (PTFE) particle suspended solution. The surface colour was changed to black with Rh-PTFE plating, and a homogeneous distribution of PTFE particles was observed in the plated layer using scanning electron microscopy (SEM). Results: The friction of Rh-PTFE plated wire with the SS bracket decreased to ½ to 1/3rd of the original force by increasing the PTFE content in the plated layer, despite the increase in surface roughness with plating. Corrosion suppression was also observed when Rh-PTFE plating was applied to a nickel wire. Conclusion: Ensuring smooth movement between the wire and bracket decreases the risk of metal dissolution, which can be effectively be achieved with Rh-PTFE plating. This finding will significantly assist orthodontists in choosing plated wires to ensure a more effective course of treatment for their patients in the future.
{"title":"Improvement of binding friction between stainless steel orthodontic wire and bracket by performing Rh-PTFE composite plating on the wire","authors":"Akihiro Koyama, T. Ono, M. Uo, Hajime Kiyokawa, Nobutaka Ohira, Y. Shima, Z. Kanno","doi":"10.1080/13440241.2020.1733180","DOIUrl":"https://doi.org/10.1080/13440241.2020.1733180","url":null,"abstract":"ABSTRACT Purpose: During orthodontic treatment, it is important to ensure that the least frictional force is applied to the teeth to ensure optimal tooth movement. We applied electrolytic rhodium-polytetrafluoroethylene (Rh-PTFE) composite plating to stainless steel (SS) orthodontic wires with the aim of suppressing friction and corrosion in the wire and facilitating the longevity of treatment. Materials and methods: SS orthodontic wires were plated with a polytetrafluoroethylene (PTFE) particle suspended solution. The surface colour was changed to black with Rh-PTFE plating, and a homogeneous distribution of PTFE particles was observed in the plated layer using scanning electron microscopy (SEM). Results: The friction of Rh-PTFE plated wire with the SS bracket decreased to ½ to 1/3rd of the original force by increasing the PTFE content in the plated layer, despite the increase in surface roughness with plating. Corrosion suppression was also observed when Rh-PTFE plating was applied to a nickel wire. Conclusion: Ensuring smooth movement between the wire and bracket decreases the risk of metal dissolution, which can be effectively be achieved with Rh-PTFE plating. This finding will significantly assist orthodontists in choosing plated wires to ensure a more effective course of treatment for their patients in the future.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"39 - 47"},"PeriodicalIF":0.4,"publicationDate":"2020-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1733180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41741682","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}
Pub Date : 2020-02-26DOI: 10.1080/13440241.2020.1712824
Surbhi Sharma, Seema Gupta, S. Ahuja, Eenal Bhambri, Rohini Sharma
ABSTRACT Purpose: To assess the effects of corticotomy on the distal movement of canine and to assess the amount of molar anchor loss. Materials and Methods: 14 patients were selected for this prospective, split-mouth, randomized controlled trial. After bilateral maxillary first premolar extractions, corticotomy was done distal to canine on one side and 150 g of force was applied. The rate of canine and molar movement, tipping and rotation were evaluated for control and experimental side. The movement of canine and anchor loss was assessed at an interval of 3 weeks, using study models, till single canine retraction was complete. Subjective assessment of the post-surgical pain, swelling, discomfort and an overall patient perception of the surgical procedure was assessed at two time points. Results: There was a significant increase in the rate of canine movement on the experiment side at T1 and T2 (p ≤ 0.01). Anchor loss was found to be present on both the sides but the difference was not statistically significant (p > 0.05). The mesiodistal tipping of canine was found to be greater on the control side than the experiment side whereas there was no statistically significant difference in the mesiodistal tipping of the molar on either side (p > 0.05). The experiment group showed a greater rotation of canine than the control (p ≤ 0.05), however, the rotation of molar was statistically insignificant. Conclusion: Corticotomy-assisted canine retraction causes a significant increase in the rate of canine retraction for the initial 2 months of the post-corticotomy period.
{"title":"Does corticotomy accelerate canine retraction with adequate anchorage control? A split mouth randomized controlled trial","authors":"Surbhi Sharma, Seema Gupta, S. Ahuja, Eenal Bhambri, Rohini Sharma","doi":"10.1080/13440241.2020.1712824","DOIUrl":"https://doi.org/10.1080/13440241.2020.1712824","url":null,"abstract":"ABSTRACT Purpose: To assess the effects of corticotomy on the distal movement of canine and to assess the amount of molar anchor loss. Materials and Methods: 14 patients were selected for this prospective, split-mouth, randomized controlled trial. After bilateral maxillary first premolar extractions, corticotomy was done distal to canine on one side and 150 g of force was applied. The rate of canine and molar movement, tipping and rotation were evaluated for control and experimental side. The movement of canine and anchor loss was assessed at an interval of 3 weeks, using study models, till single canine retraction was complete. Subjective assessment of the post-surgical pain, swelling, discomfort and an overall patient perception of the surgical procedure was assessed at two time points. Results: There was a significant increase in the rate of canine movement on the experiment side at T1 and T2 (p ≤ 0.01). Anchor loss was found to be present on both the sides but the difference was not statistically significant (p > 0.05). The mesiodistal tipping of canine was found to be greater on the control side than the experiment side whereas there was no statistically significant difference in the mesiodistal tipping of the molar on either side (p > 0.05). The experiment group showed a greater rotation of canine than the control (p ≤ 0.05), however, the rotation of molar was statistically insignificant. Conclusion: Corticotomy-assisted canine retraction causes a significant increase in the rate of canine retraction for the initial 2 months of the post-corticotomy period.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"11 - 21"},"PeriodicalIF":0.4,"publicationDate":"2020-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1712824","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48639439","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}
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