Pub Date : 2021-10-02DOI: 10.1080/13440241.2021.1975063
Tianfu Wu, Xue-dong Wang, Yan-heng Zhou
ABSTRACT Purpose: The objective of this review was to investigate the recent reports on periodontally accelerated osteogenic orthodontics (PAOO) in major orthodontic journals in order to summarize the relevant updates and clinical findings. Materials and methods: The PubMed database was searched for PAOO-related articles published in The American Journal of Orthodontics and Dentofacial Orthopaedics (AJO-DO), The Angle Orthodontists (AO), The European Journal of Orthodontics (EJO), The International Journal of Oral and Maxillofacial Surgery (IJOMS), The Australian Orthodontic Journal (AOJ) and other major orthodontic journals. Keywords used for searching were corticotomy, PAOO, piezocision and micro-osteoperforations (MOPs). Based on the information from the titles and abstracts, relevant articles on PAOO were selected and analysed. Results: As an alternative surgical method, the PAOO technique can accelerate adult patients’ tooth movement and shorten the treatment time. Compared with conventional orthodontic treatment, the PAOO technique shows advantages in terms of treatment cycle and treatment effect. Currently, scholars tend to believe that the PAOO technique does not increase the risk of root resorption, periodontium injury, and alveolar bone defect. Conclusions: Long-term efficacy of PAOO lacks randomized controlled clinical trials. However, with the deepening of research, PAOO – a relatively mature means of accelerating tooth movement – is likely to be more attractive in orthodontic treatment.
摘要目的:本综述的目的是调查最近在主要正畸杂志上关于牙周加速成骨正畸(PAOO)的报道，以总结相关的最新进展和临床发现。材料与方法:检索PubMed数据库，检索发表在The American Journal of Orthodontics and Dentofacial orthopatics (AJO-DO)、The Angle Orthodontists (AO)、The European Journal of Orthodontics (EJO)、The International Journal of Oral and Maxillofacial Surgery (IJOMS)、The Australian Orthodontic Journal (AOJ)等主要正畸期刊上的paoo相关文章。检索关键词为皮质切开术、PAOO、压切术和显微骨手术(MOPs)。根据题目和摘要的信息，选择并分析了有关PAOO的文章。结果:PAOO技术作为一种可替代的手术方法，能加速成人患者的牙齿运动，缩短治疗时间。与常规正畸治疗相比，PAOO技术在治疗周期和治疗效果上都具有优势。目前，学者们倾向于认为PAOO技术不会增加牙根吸收、牙周组织损伤和牙槽骨缺损的风险。结论:PAOO长期疗效缺乏随机对照临床试验。然而，随着研究的深入，PAOO作为一种相对成熟的加速牙齿移动的手段，可能会在正畸治疗中更具吸引力。
{"title":"Updates on periodontally accelerated osteogenic orthodontics","authors":"Tianfu Wu, Xue-dong Wang, Yan-heng Zhou","doi":"10.1080/13440241.2021.1975063","DOIUrl":"https://doi.org/10.1080/13440241.2021.1975063","url":null,"abstract":"ABSTRACT Purpose: The objective of this review was to investigate the recent reports on periodontally accelerated osteogenic orthodontics (PAOO) in major orthodontic journals in order to summarize the relevant updates and clinical findings. Materials and methods: The PubMed database was searched for PAOO-related articles published in The American Journal of Orthodontics and Dentofacial Orthopaedics (AJO-DO), The Angle Orthodontists (AO), The European Journal of Orthodontics (EJO), The International Journal of Oral and Maxillofacial Surgery (IJOMS), The Australian Orthodontic Journal (AOJ) and other major orthodontic journals. Keywords used for searching were corticotomy, PAOO, piezocision and micro-osteoperforations (MOPs). Based on the information from the titles and abstracts, relevant articles on PAOO were selected and analysed. Results: As an alternative surgical method, the PAOO technique can accelerate adult patients’ tooth movement and shorten the treatment time. Compared with conventional orthodontic treatment, the PAOO technique shows advantages in terms of treatment cycle and treatment effect. Currently, scholars tend to believe that the PAOO technique does not increase the risk of root resorption, periodontium injury, and alveolar bone defect. Conclusions: Long-term efficacy of PAOO lacks randomized controlled clinical trials. However, with the deepening of research, PAOO – a relatively mature means of accelerating tooth movement – is likely to be more attractive in orthodontic treatment.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"193 - 198"},"PeriodicalIF":0.4,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45085008","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 : 2021-10-02DOI: 10.1080/13440241.2021.2002597
H. Nakano, Chie Tachiki, Takuma Sato, M. Tsuji, Mikiko Mano, Yusuke Minoura, Kiyofumi Ogawa, Yasuyo Nomura, T. Soya, Yutaka Koshio, K. Miyazawa, Noriyoshi Shimizu, K. Moriyama
ABSTRACT Purpose This survey aimed to estimate the incidence and severity of impacted teeth indicated for fenestration or fenestration and traction in patients who visited several dental institutions nationwide in Japan from 1 April 2015 to 31 March 2016. Materials and Methods An online survey was conducted, and 236 dental institutions responded, with 176 reporting their experience with cases of impacted teeth indicated for fenestration/traction. Results Of the 1,683 cases of impacted teeth indicated for fenestration/traction, 434 (25.8%), 391 (23.2%), and 858 (51.0%) were treated using fenestration alone, fenestration/traction, and fenestration/traction and orthodontic treatment, respectively. Impacted teeth were most prevalent in the anterior maxillary region, especially in the canine region, with 435 (24.0%) and 411 (22.7%) impacted teeth on the right and left quadrants, respectively. The most commonly used diagnostic criteria were the radiographic findings of clear inversion or horizontal impaction showing that spontaneous eruption would be difficult in 123 (37.4%) cases. The most severe cases indicated for fenestration/traction were those with two or more impacted teeth, observed in 279 (56.7%) cases, followed by 174 cases of root resorption of adjacent teeth (35.4%). Root resorption due to impacted teeth was most prevalent in the maxillary left lateral incisors, evident in 65 cases (24.5%). Conclusion This study found that impacted teeth often have serious sequelae such as root resorption of adjacent teeth. Thus, early detection and intervention of impacted teeth, as well as preoperative and postoperative orthodontics to establish a physiologically normal occlusion, are necessary.
{"title":"Incidence of impacted teeth requiring fenestration, traction, and orthodontic treatment in Japan","authors":"H. Nakano, Chie Tachiki, Takuma Sato, M. Tsuji, Mikiko Mano, Yusuke Minoura, Kiyofumi Ogawa, Yasuyo Nomura, T. Soya, Yutaka Koshio, K. Miyazawa, Noriyoshi Shimizu, K. Moriyama","doi":"10.1080/13440241.2021.2002597","DOIUrl":"https://doi.org/10.1080/13440241.2021.2002597","url":null,"abstract":"ABSTRACT Purpose This survey aimed to estimate the incidence and severity of impacted teeth indicated for fenestration or fenestration and traction in patients who visited several dental institutions nationwide in Japan from 1 April 2015 to 31 March 2016. Materials and Methods An online survey was conducted, and 236 dental institutions responded, with 176 reporting their experience with cases of impacted teeth indicated for fenestration/traction. Results Of the 1,683 cases of impacted teeth indicated for fenestration/traction, 434 (25.8%), 391 (23.2%), and 858 (51.0%) were treated using fenestration alone, fenestration/traction, and fenestration/traction and orthodontic treatment, respectively. Impacted teeth were most prevalent in the anterior maxillary region, especially in the canine region, with 435 (24.0%) and 411 (22.7%) impacted teeth on the right and left quadrants, respectively. The most commonly used diagnostic criteria were the radiographic findings of clear inversion or horizontal impaction showing that spontaneous eruption would be difficult in 123 (37.4%) cases. The most severe cases indicated for fenestration/traction were those with two or more impacted teeth, observed in 279 (56.7%) cases, followed by 174 cases of root resorption of adjacent teeth (35.4%). Root resorption due to impacted teeth was most prevalent in the maxillary left lateral incisors, evident in 65 cases (24.5%). Conclusion This study found that impacted teeth often have serious sequelae such as root resorption of adjacent teeth. Thus, early detection and intervention of impacted teeth, as well as preoperative and postoperative orthodontics to establish a physiologically normal occlusion, are necessary.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"241 - 250"},"PeriodicalIF":0.4,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45470800","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 : 2021-10-02DOI: 10.1080/13440241.2021.1988436
Sarah Abu Arqub, Carlos Villegas, F. Uribe
ABSTRACT Introduction: Condylar hyperplasia (CH) is one of the causes of asymmetric facial growth resulting from overgrowth or hyperactivity in the mandibular condyles. The present review article describes the clinical and histopathological features of condylar hyperplasia and condylectomy with and without orthognathic surgery as a treatment approach to address this condition. Objectives and Conclusions: This article highlights the different classification systems to characterize CH. Clinical examination and radiographic examinations (including bone scintigraphy and single-photon emission computed tomography) over a period of time appear to be the gold standard in the diagnosis. Condylectomies, which removes a small portion of the mandibular condylar head, have been reported to produce adequate outcomes with minimal side effects on the temporomandibular joint. Timing of this surgical procedure and differences in indications and outcomes between high and low condylectomies are presented. A case report illustrating a low proportional condylectomy is reported.
{"title":"Condylectomy as a treatment approach to condylar hyperplasia","authors":"Sarah Abu Arqub, Carlos Villegas, F. Uribe","doi":"10.1080/13440241.2021.1988436","DOIUrl":"https://doi.org/10.1080/13440241.2021.1988436","url":null,"abstract":"ABSTRACT Introduction: Condylar hyperplasia (CH) is one of the causes of asymmetric facial growth resulting from overgrowth or hyperactivity in the mandibular condyles. The present review article describes the clinical and histopathological features of condylar hyperplasia and condylectomy with and without orthognathic surgery as a treatment approach to address this condition. Objectives and Conclusions: This article highlights the different classification systems to characterize CH. Clinical examination and radiographic examinations (including bone scintigraphy and single-photon emission computed tomography) over a period of time appear to be the gold standard in the diagnosis. Condylectomies, which removes a small portion of the mandibular condylar head, have been reported to produce adequate outcomes with minimal side effects on the temporomandibular joint. Timing of this surgical procedure and differences in indications and outcomes between high and low condylectomies are presented. A case report illustrating a low proportional condylectomy is reported.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"208 - 217"},"PeriodicalIF":0.4,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41960600","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 : 2021-10-02DOI: 10.1080/13440241.2021.2007678
M. Maliael, A. Subramanian, Srirengalakshmi M
ABSTRACT Purpose This review aims to evaluate the available evidence to assess and understand the effectiveness of fluoride-releasing primers in reducing white spot lesions (WSLs) around orthodontic brackets. Materials and Methods The protocol for the review was registered in the PROSPERO database (www.crd.york.ac.uk/prospero, protocol number – CRD42021230588). A systematic search of the scientific databases (PubMed, Cochrane CENTRAL, Google Scholar, and LILACS) was conducted to identify relevant studies. After screening titles and abstracts 120 articles were eliminated and the full text was sought for the four studies. Three articles were included in the qualitative analysis. Results All studies included in the qualitative analysis showed a high risk of bias. On visual examination, no studies identified a significant difference in the incidence of WSLs among the intervention and control groups. On assessing WSLs using laser fluorescence, only one study identified a significant difference in the incidence of WSLs between the groups. Conclusion With the limited available evidence, it can be concluded that there is a difference in the incidence of WSLs when fluoride-releasing primers are used to bond orthodontic brackets, although this decrease in incidence is not significant statistically. Further research is required to fully evaluate the effectiveness of using fluoride-releasing primers in orthodontics.
{"title":"Effectiveness of a fluoride-releasing orthodontic primer in reducing demineralization around brackets – a systematic review","authors":"M. Maliael, A. Subramanian, Srirengalakshmi M","doi":"10.1080/13440241.2021.2007678","DOIUrl":"https://doi.org/10.1080/13440241.2021.2007678","url":null,"abstract":"ABSTRACT Purpose This review aims to evaluate the available evidence to assess and understand the effectiveness of fluoride-releasing primers in reducing white spot lesions (WSLs) around orthodontic brackets. Materials and Methods The protocol for the review was registered in the PROSPERO database (www.crd.york.ac.uk/prospero, protocol number – CRD42021230588). A systematic search of the scientific databases (PubMed, Cochrane CENTRAL, Google Scholar, and LILACS) was conducted to identify relevant studies. After screening titles and abstracts 120 articles were eliminated and the full text was sought for the four studies. Three articles were included in the qualitative analysis. Results All studies included in the qualitative analysis showed a high risk of bias. On visual examination, no studies identified a significant difference in the incidence of WSLs among the intervention and control groups. On assessing WSLs using laser fluorescence, only one study identified a significant difference in the incidence of WSLs between the groups. Conclusion With the limited available evidence, it can be concluded that there is a difference in the incidence of WSLs when fluoride-releasing primers are used to bond orthodontic brackets, although this decrease in incidence is not significant statistically. Further research is required to fully evaluate the effectiveness of using fluoride-releasing primers in orthodontics.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"218 - 223"},"PeriodicalIF":0.4,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43697580","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 : 2021-10-02DOI: 10.1080/13440241.2021.1972243
Natnicha Pariyatdulapak, Pornkiat Churnjitapirom, T. Srikhirin, Nita Viwattanatipa
ABSTRACT Purpose To evaluate the shear bond strength of orthodontic buttons bonded on various clear aligner materials using orthodontic plastic adhesive. Materials and methods Three types of thermoplastic materials: 1) Duran (Polyethylene terephthalate glycol), 2) Essix A+ (Polyethylene terephthalate glycol), and 3) Zendura (Polyurethane) were bonded with either metal or plastic buttons using orthodontic plastic adhesive (Bond aligner®). Six experimental groups with 15 specimens per group were prepared. Bond strength testing was done according to the Lap Shear Test Method (ASTM D3163) using the universal testing machine. Bond failure mode (modified from ASTM D5573) was examined with a stereoscope. Kruskal-Wallis and post hoc tests were used to analyse the differences in shear bond strength among the six groups. Results Mean bond strengths were as follows: 1) Duran-metal (DM) (7.04 MPa); 2) Duran-plastic (DP) (5.37 MPa); 3) Essix-metal (EM) (5.55 MPa); 4) Essix-plastic (EP) (4.62 MPa); 5) Zendura-metal (ZM) (1.17 MPa); and 6) Zendura-plastic (ZP) (1.40 MPa). Shear bond strength among the three thermoplastic materials were significantly different (p < .05). For the bond failure mode, regardless of button type, Duran and Essix A+ showed substrate failure of the thermoplastic sheet, while Zendura showed adhesive failure at the thermoplastic sheet interface. Conclusion Orthodontic buttons bonded on Duran and Essix A+ using orthodontic plastic adhesive could achieve very high bond strength that the thermoplastic sheets would tear before button detachment occurred. Buttons bonded to Zendura resulted in significantly greater bond failure rates.
{"title":"Bond strength of orthodontic buttons on clear aligner materials","authors":"Natnicha Pariyatdulapak, Pornkiat Churnjitapirom, T. Srikhirin, Nita Viwattanatipa","doi":"10.1080/13440241.2021.1972243","DOIUrl":"https://doi.org/10.1080/13440241.2021.1972243","url":null,"abstract":"ABSTRACT Purpose To evaluate the shear bond strength of orthodontic buttons bonded on various clear aligner materials using orthodontic plastic adhesive. Materials and methods Three types of thermoplastic materials: 1) Duran (Polyethylene terephthalate glycol), 2) Essix A+ (Polyethylene terephthalate glycol), and 3) Zendura (Polyurethane) were bonded with either metal or plastic buttons using orthodontic plastic adhesive (Bond aligner®). Six experimental groups with 15 specimens per group were prepared. Bond strength testing was done according to the Lap Shear Test Method (ASTM D3163) using the universal testing machine. Bond failure mode (modified from ASTM D5573) was examined with a stereoscope. Kruskal-Wallis and post hoc tests were used to analyse the differences in shear bond strength among the six groups. Results Mean bond strengths were as follows: 1) Duran-metal (DM) (7.04 MPa); 2) Duran-plastic (DP) (5.37 MPa); 3) Essix-metal (EM) (5.55 MPa); 4) Essix-plastic (EP) (4.62 MPa); 5) Zendura-metal (ZM) (1.17 MPa); and 6) Zendura-plastic (ZP) (1.40 MPa). Shear bond strength among the three thermoplastic materials were significantly different (p < .05). For the bond failure mode, regardless of button type, Duran and Essix A+ showed substrate failure of the thermoplastic sheet, while Zendura showed adhesive failure at the thermoplastic sheet interface. Conclusion Orthodontic buttons bonded on Duran and Essix A+ using orthodontic plastic adhesive could achieve very high bond strength that the thermoplastic sheets would tear before button detachment occurred. Buttons bonded to Zendura resulted in significantly greater bond failure rates.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"224 - 231"},"PeriodicalIF":0.4,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45703975","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 : 2021-09-28DOI: 10.1080/13440241.2021.1978790
G. Sameshima
ABSTRACT Title Orthodontics and the Pandemic: Long-Term Consequencess Purpose Review of topics related to orthodontics and the COVID19 pandemic. Materials and Methods Originally planned as a Critical Appraisal of select research questions, it became evident there are insufficient studies; rather, this is a comprehensive review of the scientific literature, professional news sources, and lower tier publications. Results The effect of the pandemic on orthodontic private practice and orthodontic education starting in March 2020 was keenly felt as most closed completely or opened for emergencies only. When practices reopened, it was realized that orthodontic care was urgent – patients could not wait for months without continuing their treatment. Orthodontists were confronted with the need to make broad and costly modifications to the way they practiced in a short time. 15 Changes included full personal protective equipment, increased disinfection protocols, airflow considerations, and fewer patients seen with longer appointments and longer workdays. Orthodontic residencies closed for 3 months or more, and like private practices, were forced to make the same changes while trying to ensure residents received the training and experience required to graduate. Fortunately, fifteen months later practices in most countries are 20 returning to normal levels of income and production, albeit at higher costs. Conclusion Changes in infection control, airflow in an office, aerosol generation, and the trend towards intraoral scanning and the contact-less or paperless office are probably permanent. Orthodontists must also be aware of their obligation as health providers interested in the overall well-being of their patients.
{"title":"Orthodontics and the Pandemic: Long Term Consequences","authors":"G. Sameshima","doi":"10.1080/13440241.2021.1978790","DOIUrl":"https://doi.org/10.1080/13440241.2021.1978790","url":null,"abstract":"ABSTRACT Title Orthodontics and the Pandemic: Long-Term Consequencess Purpose Review of topics related to orthodontics and the COVID19 pandemic. Materials and Methods Originally planned as a Critical Appraisal of select research questions, it became evident there are insufficient studies; rather, this is a comprehensive review of the scientific literature, professional news sources, and lower tier publications. Results The effect of the pandemic on orthodontic private practice and orthodontic education starting in March 2020 was keenly felt as most closed completely or opened for emergencies only. When practices reopened, it was realized that orthodontic care was urgent – patients could not wait for months without continuing their treatment. Orthodontists were confronted with the need to make broad and costly modifications to the way they practiced in a short time. 15 Changes included full personal protective equipment, increased disinfection protocols, airflow considerations, and fewer patients seen with longer appointments and longer workdays. Orthodontic residencies closed for 3 months or more, and like private practices, were forced to make the same changes while trying to ensure residents received the training and experience required to graduate. Fortunately, fifteen months later practices in most countries are 20 returning to normal levels of income and production, albeit at higher costs. Conclusion Changes in infection control, airflow in an office, aerosol generation, and the trend towards intraoral scanning and the contact-less or paperless office are probably permanent. Orthodontists must also be aware of their obligation as health providers interested in the overall well-being of their patients.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"199 - 207"},"PeriodicalIF":0.4,"publicationDate":"2021-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47907209","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}
ABSTRACT Purpose The purpose of the present study was to investigate the effect of the size variation of the mandibular dental arch on the magnitude and direction of orthodontic forces delivered by a variety of commercially available preformed rectangular Ni-Ti archwires. Materials and methods The means and standard deviations (SDs) of intercanine and intermolar widths and the means of dental arch depths at the canines and first molars were established based on our previous studies of subjects with untreated normal occlusions. The mandibular dental arch of a multi-sensor measuring system was adjusted to the mean, enlarged to +1SD and reduced to −1SD sizes of the normal dental arch. Fifty-nine types of 0.019 × 0.025-inch NiTi archwires were selected, and the intercanine and intermolar widths of the archwires were measured. Delivered forces were measured at the central incisors, canines, and first molars for each dental arch condition. Results Significant correlations were found between archwire width and forces at all examined teeth for all dental arch widths. Significantly greater facial direction forces were delivered at the central incisor for the large dental arch condition than for the small and mean dental arch conditions. Significantly greater facial direction force was delivered at the canines for the small dental arch than for the large dental arch condition. Conclusion Possible risks of clinically significant magnitudes of orthodontic force in the facial direction at the central incisors and canines were observed when using preformed rectangular NiTi archwires for patients with relatively large and small dental arches, respectively.
{"title":"Effects of dental arch size variation on orthodontic forces delivered by preformed Ni-Ti archwires","authors":"Akihiko Tachi, Naomi Saze, Keisuke Tochigi, Kazuhito Arai","doi":"10.1080/13440241.2021.1973313","DOIUrl":"https://doi.org/10.1080/13440241.2021.1973313","url":null,"abstract":"ABSTRACT Purpose The purpose of the present study was to investigate the effect of the size variation of the mandibular dental arch on the magnitude and direction of orthodontic forces delivered by a variety of commercially available preformed rectangular Ni-Ti archwires. Materials and methods The means and standard deviations (SDs) of intercanine and intermolar widths and the means of dental arch depths at the canines and first molars were established based on our previous studies of subjects with untreated normal occlusions. The mandibular dental arch of a multi-sensor measuring system was adjusted to the mean, enlarged to +1SD and reduced to −1SD sizes of the normal dental arch. Fifty-nine types of 0.019 × 0.025-inch NiTi archwires were selected, and the intercanine and intermolar widths of the archwires were measured. Delivered forces were measured at the central incisors, canines, and first molars for each dental arch condition. Results Significant correlations were found between archwire width and forces at all examined teeth for all dental arch widths. Significantly greater facial direction forces were delivered at the central incisor for the large dental arch condition than for the small and mean dental arch conditions. Significantly greater facial direction force was delivered at the canines for the small dental arch than for the large dental arch condition. Conclusion Possible risks of clinically significant magnitudes of orthodontic force in the facial direction at the central incisors and canines were observed when using preformed rectangular NiTi archwires for patients with relatively large and small dental arches, respectively.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"232 - 240"},"PeriodicalIF":0.4,"publicationDate":"2021-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46081527","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 : 2021-07-03DOI: 10.1080/13440241.2021.1952369
A. Tehranchi, Masoumeh Mahmoum, Shahab Kavousinejad
ABSTRACT Purpose This study aimed to compare skeletal age determination by using the ratio of third and fourth cervical vertebral dimensions (CVDs) versus the cervical vertebral maturation (CVM) method in an Iranian population. Materials and methods Lateral cephalometric radiographs of 240 patients were evaluated in this cross sectional study. The samples were classified into three groups (n = 80) of pre-peak of mandibular growth period (group 1), peak of mandibular growth period (group 2), and post-peak of mandibular growth period (group 3) according to the CVM stage. The dimensions of the third and fourth cervical vertebrae were measured. The anterior vertebral body height (AH) was divided by the anteroposterior vertebral body length (AP). The summation of the AH:AP ratio of C3 and C4 was calculated and reported as the SV. The correlation of SVs of 240 patients with their CVM stage was investigated. P-value less than 0.05 is statistically significant. Results SVs had a significant correlation with the CVM groups (P < 0.05). The area under the curve (AUC) was high for discrimination of group 1 from group 2 (AUC = 0.9776; 95% CI = 0.9448–0.9960), and also group 2 from group 3 (AUC = 0.9848; 95% CI = 0.9539–0.9984). The Youden index specified SVs of 1.29 and 1.61 as the best cut-off points for discriminating group 1 from group 2, and group 2 from group 3, respectively. Conclusions The two determined cut-off points could discriminate the groups with high sensitivity and specificity. Accordingly, we can use the CVD to determine the patients’ mandibular growth status.
摘要:目的本研究旨在比较伊朗人群中使用第三和第四颈椎尺寸(cvd)与颈椎成熟度(CVM)方法测定骨骼年龄的差异。材料和方法本横断面研究对240例患者的侧位头颅x线片进行评价。根据CVM分期将样本分为下颌生长期峰前组(1组)、下颌生长期峰后组(2组)和下颌生长期峰后组(3组)，各80例。测量第三和第四颈椎的尺寸。前椎体高度(AH)除以前后椎体长度(AP)。计算C3和C4的AH:AP比值的总和，并作为SV报告。研究了240例CVM患者SVs与CVM分期的相关性。p值小于0.05有统计学意义。结果SVs与CVM组有显著相关性(P < 0.05)。曲线下面积(AUC)对组1和组2的鉴别性较高(AUC = 0.9776;95% CI = 0.9448-0.9960)，组2也来自组3 (AUC = 0.9848;95% ci = 0.9539-0.9984)。约登指数分别以1.29和1.61的SVs作为区分第1组和第2组、第2组和第3组的最佳分界点。结论所确定的两个分界点具有较高的灵敏度和特异性。因此，我们可以使用CVD来确定患者的下颌生长状况。
{"title":"Quantitative determination of skeletal age using cervical vertebral dimensions","authors":"A. Tehranchi, Masoumeh Mahmoum, Shahab Kavousinejad","doi":"10.1080/13440241.2021.1952369","DOIUrl":"https://doi.org/10.1080/13440241.2021.1952369","url":null,"abstract":"ABSTRACT Purpose This study aimed to compare skeletal age determination by using the ratio of third and fourth cervical vertebral dimensions (CVDs) versus the cervical vertebral maturation (CVM) method in an Iranian population. Materials and methods Lateral cephalometric radiographs of 240 patients were evaluated in this cross sectional study. The samples were classified into three groups (n = 80) of pre-peak of mandibular growth period (group 1), peak of mandibular growth period (group 2), and post-peak of mandibular growth period (group 3) according to the CVM stage. The dimensions of the third and fourth cervical vertebrae were measured. The anterior vertebral body height (AH) was divided by the anteroposterior vertebral body length (AP). The summation of the AH:AP ratio of C3 and C4 was calculated and reported as the SV. The correlation of SVs of 240 patients with their CVM stage was investigated. P-value less than 0.05 is statistically significant. Results SVs had a significant correlation with the CVM groups (P < 0.05). The area under the curve (AUC) was high for discrimination of group 1 from group 2 (AUC = 0.9776; 95% CI = 0.9448–0.9960), and also group 2 from group 3 (AUC = 0.9848; 95% CI = 0.9539–0.9984). The Youden index specified SVs of 1.29 and 1.61 as the best cut-off points for discriminating group 1 from group 2, and group 2 from group 3, respectively. Conclusions The two determined cut-off points could discriminate the groups with high sensitivity and specificity. Accordingly, we can use the CVD to determine the patients’ mandibular growth status.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"135 - 142"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1952369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43043735","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 : 2021-07-03DOI: 10.1080/13440241.2021.1958605
Preeya Suwanwitid, Tanan Jaruprakorn, C. Changsiripun
ABSTRACT Objective This case report emphasizes the importance of controlling vertical movement of posterior teeth for a non-growing Class II malocclusion with a complete deep overbite and large overjet. The intrusion of incisors without molar extrusion is one of the key factors for the aesthetics and stability of treatment outcomes. Case A 19-year-old woman had a chief complaint of excessive incisor display while smiling. She was diagnosed with an Angle Class II malocclusion with a complete deep overbite and large overjet caused by the improper interposition of her lower lip and overerupted incisors. To achieve satisfactory results, the vertical movements of posterior teeth needed to be controlled. Two orthodontic miniscrews were used in her maxillary arch to intrude the incisors and control the movement of molars. Concurrently, a utility intrusion arch was used to intrude and labially incline the lower incisors. Treatment result Her upper and lower incisors had been intruded by 4 mm and 3 mm, respectively, without the extrusion of posterior teeth. The-lip-to-incisor relationship at rest position had been improved and she was pleased with the results. Conclusion These mechanics were effective for a complete deep overbite correction without undesirable effects.
{"title":"The importance of controlling vertical movement of posterior teeth for a Class II malocclusion in a non-growing patient: a case report","authors":"Preeya Suwanwitid, Tanan Jaruprakorn, C. Changsiripun","doi":"10.1080/13440241.2021.1958605","DOIUrl":"https://doi.org/10.1080/13440241.2021.1958605","url":null,"abstract":"ABSTRACT Objective This case report emphasizes the importance of controlling vertical movement of posterior teeth for a non-growing Class II malocclusion with a complete deep overbite and large overjet. The intrusion of incisors without molar extrusion is one of the key factors for the aesthetics and stability of treatment outcomes. Case A 19-year-old woman had a chief complaint of excessive incisor display while smiling. She was diagnosed with an Angle Class II malocclusion with a complete deep overbite and large overjet caused by the improper interposition of her lower lip and overerupted incisors. To achieve satisfactory results, the vertical movements of posterior teeth needed to be controlled. Two orthodontic miniscrews were used in her maxillary arch to intrude the incisors and control the movement of molars. Concurrently, a utility intrusion arch was used to intrude and labially incline the lower incisors. Treatment result Her upper and lower incisors had been intruded by 4 mm and 3 mm, respectively, without the extrusion of posterior teeth. The-lip-to-incisor relationship at rest position had been improved and she was pleased with the results. Conclusion These mechanics were effective for a complete deep overbite correction without undesirable effects.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"185 - 192"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1958605","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44474704","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 : 2021-07-03DOI: 10.1080/13440241.2021.1958614
Arathi Murugesan, N. R
ABSTRACT Objective : The present study was aimed to analyse the efficacy of specs loop, a newly designed closing loop. Materials and Methods : A finite element maxillary model for en-masse anterior retraction was made. The newly designed specs loop was tested with different preactivation bends (alpha-30 degree; beta-15 degree, 30 degree and 45 degree) and without preactivation bends. The horizontal and vertical forces and moments at both the alpha and beta nodes and overall moment to force ratio, range of crown tip, root tip and vertical movement of all the individual teeth, stress acting on the teeth and bone were calculated for each group for a horizontal activation of 3 mm using Abaqus software. Results : Stress acting on the teeth and bone decreased with increasing beta bend. Moment-to-force (M/F) ratio acting on the anterior teeth was approximately 10:1 with preactivation bends of alpha 30 degrees and beta degrees 15, 30 and 45 degrees whereas the M/F ratio was only 2:1 without the preactivation bends. With increasing beta bend, distal crown tip of the teeth and the extrusive movement of the posteriors increased while the extrusive movements of the anterior decreased. Conclusion : The specs loop with preactivation bends can be efficiently used for en-masse anterior retraction.
{"title":"A newly designed loop for en-masse anterior retraction - a finite element study","authors":"Arathi Murugesan, N. R","doi":"10.1080/13440241.2021.1958614","DOIUrl":"https://doi.org/10.1080/13440241.2021.1958614","url":null,"abstract":"ABSTRACT Objective : The present study was aimed to analyse the efficacy of specs loop, a newly designed closing loop. Materials and Methods : A finite element maxillary model for en-masse anterior retraction was made. The newly designed specs loop was tested with different preactivation bends (alpha-30 degree; beta-15 degree, 30 degree and 45 degree) and without preactivation bends. The horizontal and vertical forces and moments at both the alpha and beta nodes and overall moment to force ratio, range of crown tip, root tip and vertical movement of all the individual teeth, stress acting on the teeth and bone were calculated for each group for a horizontal activation of 3 mm using Abaqus software. Results : Stress acting on the teeth and bone decreased with increasing beta bend. Moment-to-force (M/F) ratio acting on the anterior teeth was approximately 10:1 with preactivation bends of alpha 30 degrees and beta degrees 15, 30 and 45 degrees whereas the M/F ratio was only 2:1 without the preactivation bends. With increasing beta bend, distal crown tip of the teeth and the extrusive movement of the posteriors increased while the extrusive movements of the anterior decreased. Conclusion : The specs loop with preactivation bends can be efficiently used for en-masse anterior retraction.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"143 - 148"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1958614","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44627814","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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