Pub Date : 2020-11-13DOI: 10.1080/13440241.2020.1845587
Junichi Miyano, N. Kawanabe, Atsushi Fujishiro, R. Kanomi, H. Kamioka
ABSTRACT Purpose: The purpose of this study was to investigate the precise effects of a headgear (HG) on the maxillary first premolar (U4), maxillary second premolar (U5), and maxillary first molar (U6). Materials and methods: The participants were divided into two groups: HG group and control group. The HG group consisted of 25 patients who were treated with an HG and maxillary lateral expansion. The control group consisted of 21 patients who received maxillary lateral expansion treatment. Movements of U4, U5, and U6 were measured using cone-beam computed tomography (CBCT). The mesiodistal positions of U4, U5, and U6 were assessed based on the vertical reference plane (VRP) defined by the landmarks of the maxilla. Results: Distal movement of U4, U5, and U6 was observed in the HG group, while mesial movement of U4, U5, and U6 was observed in the control group. Moreover, the positions of U4 and U5 were more distal than that of U6 in the HG group, while the positions of U4 and U5 were less mesial than that of U6 in the control group. The amount of distal movement of U4 and U5 was strongly correlated with that of U6 in the HG group. Conclusions: Simultaneous distal movement of U4 and U5 can be achieved with U6 distal movement using an HG in the early mixed dentition period. Moreover, the amount of distal movement of U4 and U5 was larger than that of U6. Hence, early orthodontic treatment using HG appears to be effective for correcting Class II malocclusion.
{"title":"Simultaneous distal movement of the maxillary first and second premolars can be achieved by distal movement of the maxillary first molar using a headgear","authors":"Junichi Miyano, N. Kawanabe, Atsushi Fujishiro, R. Kanomi, H. Kamioka","doi":"10.1080/13440241.2020.1845587","DOIUrl":"https://doi.org/10.1080/13440241.2020.1845587","url":null,"abstract":"ABSTRACT Purpose: The purpose of this study was to investigate the precise effects of a headgear (HG) on the maxillary first premolar (U4), maxillary second premolar (U5), and maxillary first molar (U6). Materials and methods: The participants were divided into two groups: HG group and control group. The HG group consisted of 25 patients who were treated with an HG and maxillary lateral expansion. The control group consisted of 21 patients who received maxillary lateral expansion treatment. Movements of U4, U5, and U6 were measured using cone-beam computed tomography (CBCT). The mesiodistal positions of U4, U5, and U6 were assessed based on the vertical reference plane (VRP) defined by the landmarks of the maxilla. Results: Distal movement of U4, U5, and U6 was observed in the HG group, while mesial movement of U4, U5, and U6 was observed in the control group. Moreover, the positions of U4 and U5 were more distal than that of U6 in the HG group, while the positions of U4 and U5 were less mesial than that of U6 in the control group. The amount of distal movement of U4 and U5 was strongly correlated with that of U6 in the HG group. Conclusions: Simultaneous distal movement of U4 and U5 can be achieved with U6 distal movement using an HG in the early mixed dentition period. Moreover, the amount of distal movement of U4 and U5 was larger than that of U6. Hence, early orthodontic treatment using HG appears to be effective for correcting Class II malocclusion.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"171 - 178"},"PeriodicalIF":0.4,"publicationDate":"2020-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1845587","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43920214","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 : 2020-11-08DOI: 10.1080/13440241.2020.1843355
Sayuri Taira, Y. Oga, T. Yagi, S. Miyawaki
ABSTRACT Objective: This case report describes the successful treatment of a patient with a skeletal Class I malocclusion, complete transposition of the upper right canine and first premolar, and scissors-bite on the second molars, treated by non-extraction and retention of the transposed positions of the teeth. Case: The patient was a 10-year and 2-month-old girl, who was referred to our clinic. In Phase I treatment, dental crowding was improved by distal movement of the maxillary and mandibular first molars. In Phase II treatment, each scissors-bite on the bilateral second molar was treated and the canine and first premolar were aligned in the transposed position. Treatment results: Consequently, she acquired excellent occlusion and improved masticatory jaw movement. Three years after the active treatment, treatment results were stable with the use of removable retainers. Conclusion: Orthodontic treatment for scissors-bite may increase masticatory performance because it improves masticatory movement significantly. Additionally, orthodontic treatment of transposed teeth by retaining the transposed position without extraction could lead to satisfactory aesthetic and functional final results, which implies that it could be a valid treatment option.
{"title":"Treatment of complete transposition of upper right canine and first premolar and scissors-bite on second molars by non-extraction and retention of the transposed positions","authors":"Sayuri Taira, Y. Oga, T. Yagi, S. Miyawaki","doi":"10.1080/13440241.2020.1843355","DOIUrl":"https://doi.org/10.1080/13440241.2020.1843355","url":null,"abstract":"ABSTRACT Objective: This case report describes the successful treatment of a patient with a skeletal Class I malocclusion, complete transposition of the upper right canine and first premolar, and scissors-bite on the second molars, treated by non-extraction and retention of the transposed positions of the teeth. Case: The patient was a 10-year and 2-month-old girl, who was referred to our clinic. In Phase I treatment, dental crowding was improved by distal movement of the maxillary and mandibular first molars. In Phase II treatment, each scissors-bite on the bilateral second molar was treated and the canine and first premolar were aligned in the transposed position. Treatment results: Consequently, she acquired excellent occlusion and improved masticatory jaw movement. Three years after the active treatment, treatment results were stable with the use of removable retainers. Conclusion: Orthodontic treatment for scissors-bite may increase masticatory performance because it improves masticatory movement significantly. Additionally, orthodontic treatment of transposed teeth by retaining the transposed position without extraction could lead to satisfactory aesthetic and functional final results, which implies that it could be a valid treatment option.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"179 - 187"},"PeriodicalIF":0.4,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1843355","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48022783","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 : 2020-11-06DOI: 10.1080/13440241.2020.1843354
Yuri Higashi, K. Inami, H. Shimizu, N. Matsumoto
ABSTRACT Purpose For many years, people have attempted to identify ways of efficiently moving teeth in orthodontic therapy to reduce harmful effects. In this study, we investigate whether the non-surgical method of low-intensity pulsed ultrasound (LIPUS) irradiation affects osteoclast differentiation in vitro. Materials and Methods RAW264 cells were stimulated with RANKL and U0126, and LIPUS irradiation was performed using different ultrasonic outputs, irradiation times, and number of irradiations. Assessments used TRAP staining, TRAP quantitative assays, and western blot analysis. Results LIPUS irradiation significantly increased osteoclast differentiation rates of RAW264 cells. The rates were significantly higher in the three-time irradiation group compared with the single irradiation group. However, significant differences were not observed between the ultrasonic output. TRAP quantitative assay results showed significantly increased osteoclast differentiation rates with increased irradiation time, however, only in the single irradiation group. Conclusion These results suggest that an increased number of LIPUS irradiations may improve its effectiveness in orthodontic therapy.
{"title":"Effect of low intensity pulsed ultrasound on osteoclast differentiation","authors":"Yuri Higashi, K. Inami, H. Shimizu, N. Matsumoto","doi":"10.1080/13440241.2020.1843354","DOIUrl":"https://doi.org/10.1080/13440241.2020.1843354","url":null,"abstract":"ABSTRACT Purpose For many years, people have attempted to identify ways of efficiently moving teeth in orthodontic therapy to reduce harmful effects. In this study, we investigate whether the non-surgical method of low-intensity pulsed ultrasound (LIPUS) irradiation affects osteoclast differentiation in vitro. Materials and Methods RAW264 cells were stimulated with RANKL and U0126, and LIPUS irradiation was performed using different ultrasonic outputs, irradiation times, and number of irradiations. Assessments used TRAP staining, TRAP quantitative assays, and western blot analysis. Results LIPUS irradiation significantly increased osteoclast differentiation rates of RAW264 cells. The rates were significantly higher in the three-time irradiation group compared with the single irradiation group. However, significant differences were not observed between the ultrasonic output. TRAP quantitative assay results showed significantly increased osteoclast differentiation rates with increased irradiation time, however, only in the single irradiation group. Conclusion These results suggest that an increased number of LIPUS irradiations may improve its effectiveness in orthodontic therapy.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"163 - 169"},"PeriodicalIF":0.4,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1843354","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43301620","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 : 2020-10-27DOI: 10.1080/13440241.2020.1839208
Mioko Sakurai, Mami Shimizu
ABSTRACT Purpose To analysis, daidzein increases the expression of bone morphogenetic protein-2 (BMP-2) and runt-related transcription factor 2 (Runx2) after experimental tooth movement (EXTM). Materials and Methods 36 Wistar rats were randomly divided into the EXTM group and EXTM with daidzein group (EXTM+DZ group). After EXTM, the rats in the EXTM+DZ group were treated with daidzein (10 mg/kg/day). Micro-computed tomography (CT) analysis revealed the bone mineral density (BMD), ratio of bone volume to tissue volume (BV/TV), and ratio of relapse. Histopathological changes were examined by immunohistochemical staining for BMP-2 and Runx2. Human PDLCs were subjected to tension force and treated with 10 μg/mL daidzein. The expression of BMP-2 and Runx2 by daidzein was confirmed by real-time polymerase chain reaction and enzyme-linked immunosorbent assay. Results The EXTM+DZ group showed a significantly decreased ratio of relapse and increased BMD and BV/TV as compared to the EXTM group. The ratio of BMP-2 – and Runx-2 –positive cells in the EXTM+DZ group was higher than that in the EXTM group. Moreover, daidzein upregulated the mRNA expression and protein levels of BMP-2 and Runx2 in a time-dependent manner. Conclusion These results suggested that daidzein decreased the ratio of relapse through BMP-2 and Runx2 expression.
{"title":"Daidzein induces bone morphogenetic protein-2 and runt-related transcription 2 on periodontal ligament cells after experimental tooth movement","authors":"Mioko Sakurai, Mami Shimizu","doi":"10.1080/13440241.2020.1839208","DOIUrl":"https://doi.org/10.1080/13440241.2020.1839208","url":null,"abstract":"ABSTRACT Purpose To analysis, daidzein increases the expression of bone morphogenetic protein-2 (BMP-2) and runt-related transcription factor 2 (Runx2) after experimental tooth movement (EXTM). Materials and Methods 36 Wistar rats were randomly divided into the EXTM group and EXTM with daidzein group (EXTM+DZ group). After EXTM, the rats in the EXTM+DZ group were treated with daidzein (10 mg/kg/day). Micro-computed tomography (CT) analysis revealed the bone mineral density (BMD), ratio of bone volume to tissue volume (BV/TV), and ratio of relapse. Histopathological changes were examined by immunohistochemical staining for BMP-2 and Runx2. Human PDLCs were subjected to tension force and treated with 10 μg/mL daidzein. The expression of BMP-2 and Runx2 by daidzein was confirmed by real-time polymerase chain reaction and enzyme-linked immunosorbent assay. Results The EXTM+DZ group showed a significantly decreased ratio of relapse and increased BMD and BV/TV as compared to the EXTM group. The ratio of BMP-2 – and Runx-2 –positive cells in the EXTM+DZ group was higher than that in the EXTM group. Moreover, daidzein upregulated the mRNA expression and protein levels of BMP-2 and Runx2 in a time-dependent manner. Conclusion These results suggested that daidzein decreased the ratio of relapse through BMP-2 and Runx2 expression.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"145 - 151"},"PeriodicalIF":0.4,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1839208","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48074217","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 : 2020-09-28DOI: 10.1080/13440241.2020.1822062
K. Nakatsugawa, H. Kurosaka, T. Yamashiro
ABSTRACT Purpose Due to the expanding demand for adult orthodontics, the number of cases which require comprehensive dental management is increasing. Adult orthodontic patients can exhibit multiple missing and/or heavily restored teeth, which could lead to an unusual extraction pattern for treatment. However, there is little existing evidence about adult orthodontic treatment of patients who present with irregular extraction. In the present report, we introduce a case with successful treatment outcome for complex problems, including anteroposterior skeletal discrepancy with multiple missing and heavily restored permanent teeth. Material and methods The patient was a 23-year-old woman case with skeletal discrepancy which required orthognathic surgery for correction. For her comprehensive dental condition, we decided to orthodontically close the spaces of her missing upper left first molar and her extracted lower left first molar. The upper space closure required sinus lift and bone graft to supply sufficient alveolar bone for tooth movement. The lower space was closed by sectional osteotomy at the time two jaw orthognathic surgeries were performed to correct her skeletal discrepancy. Results and conclusion At the end of the surgical and orthodontic treatments, functional occlusion and an improved facial profile were achieved. This case report provides new evidence and treatment procedures for patients who require a complex extraction pattern with orthognathic surgery.
{"title":"Orthognathic treatment of patient with missing permanent first molars","authors":"K. Nakatsugawa, H. Kurosaka, T. Yamashiro","doi":"10.1080/13440241.2020.1822062","DOIUrl":"https://doi.org/10.1080/13440241.2020.1822062","url":null,"abstract":"ABSTRACT Purpose Due to the expanding demand for adult orthodontics, the number of cases which require comprehensive dental management is increasing. Adult orthodontic patients can exhibit multiple missing and/or heavily restored teeth, which could lead to an unusual extraction pattern for treatment. However, there is little existing evidence about adult orthodontic treatment of patients who present with irregular extraction. In the present report, we introduce a case with successful treatment outcome for complex problems, including anteroposterior skeletal discrepancy with multiple missing and heavily restored permanent teeth. Material and methods The patient was a 23-year-old woman case with skeletal discrepancy which required orthognathic surgery for correction. For her comprehensive dental condition, we decided to orthodontically close the spaces of her missing upper left first molar and her extracted lower left first molar. The upper space closure required sinus lift and bone graft to supply sufficient alveolar bone for tooth movement. The lower space was closed by sectional osteotomy at the time two jaw orthognathic surgeries were performed to correct her skeletal discrepancy. Results and conclusion At the end of the surgical and orthodontic treatments, functional occlusion and an improved facial profile were achieved. This case report provides new evidence and treatment procedures for patients who require a complex extraction pattern with orthognathic surgery.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"135 - 143"},"PeriodicalIF":0.4,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1822062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46255228","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 : 2020-09-21DOI: 10.1080/13440241.2020.1820801
T. Hoyte, Anil Ali, P. Mossey
ABSTRACT Abstract The aim of this study is to establish for the first time cephalometric norms for bimaxillary protrusion in Trinidad and Tobago population and to compare findings to previously published norms for other bimaxillary protrusion groups. Materials and Methods In total, 109 standardized lateral cephalometric radiographs were taken by one investigator of bimaxillary protrusion patients prior to receiving orthodontic treatment. The sample consisted of 52 boys and 57 girls aged 10–17 years. The cephalograms were traced using 48 hard and soft tissue and 25 linear and angular cephalometric measurements. Independent sample t-test was used to assess inter-gender differences, norms were calculated. The results were then compared to the norms for other bimaxillary protrusion populations. Results The mean values and standard deviations obtained were: SNA, 85.9° (± 4.9°); SNB, 78.7°(± 4.5°); ANB, 7.2°(± 2.5°); MMPA, 32.3°(±5.1°); UI-LI,109.7° (±8.2°); UI-Max, 118.7° (±6.1°); LI-Man, 101.4° (±5.9°); LI-Apo, 3.8° (±2.6°); Upper lip to E-plane 2.0 mm (±3) and Lower Lip to E-plane 5.6 mm (±3.2).The independent t-test showed sexual dimorphism with SNA and upper and lower lip to E-plane being higher in males compared to females. The maxilla and mandible were more anteriorly placed in this sample as compared to Caucasian norms. ANB, MMPA, UI-Max, LI-Man, LI-Apo, upper lip and lower lip to E-plane, were all higher in this population compared to other bimaxillary protrusion populations. Conclusions There are some fundamental differences in the cephalometric norms for the bimaxillary protrusion population in Trinidad and Tobago and in the context of orthodontic diagnosis and treatment planning these cephalometric norms should be the yardstick.
{"title":"Cephalometric norms for Bimaxillary Protrusion in Trinidad and Tobago: a preliminary study","authors":"T. Hoyte, Anil Ali, P. Mossey","doi":"10.1080/13440241.2020.1820801","DOIUrl":"https://doi.org/10.1080/13440241.2020.1820801","url":null,"abstract":"ABSTRACT Abstract The aim of this study is to establish for the first time cephalometric norms for bimaxillary protrusion in Trinidad and Tobago population and to compare findings to previously published norms for other bimaxillary protrusion groups. Materials and Methods In total, 109 standardized lateral cephalometric radiographs were taken by one investigator of bimaxillary protrusion patients prior to receiving orthodontic treatment. The sample consisted of 52 boys and 57 girls aged 10–17 years. The cephalograms were traced using 48 hard and soft tissue and 25 linear and angular cephalometric measurements. Independent sample t-test was used to assess inter-gender differences, norms were calculated. The results were then compared to the norms for other bimaxillary protrusion populations. Results The mean values and standard deviations obtained were: SNA, 85.9° (± 4.9°); SNB, 78.7°(± 4.5°); ANB, 7.2°(± 2.5°); MMPA, 32.3°(±5.1°); UI-LI,109.7° (±8.2°); UI-Max, 118.7° (±6.1°); LI-Man, 101.4° (±5.9°); LI-Apo, 3.8° (±2.6°); Upper lip to E-plane 2.0 mm (±3) and Lower Lip to E-plane 5.6 mm (±3.2).The independent t-test showed sexual dimorphism with SNA and upper and lower lip to E-plane being higher in males compared to females. The maxilla and mandible were more anteriorly placed in this sample as compared to Caucasian norms. ANB, MMPA, UI-Max, LI-Man, LI-Apo, upper lip and lower lip to E-plane, were all higher in this population compared to other bimaxillary protrusion populations. Conclusions There are some fundamental differences in the cephalometric norms for the bimaxillary protrusion population in Trinidad and Tobago and in the context of orthodontic diagnosis and treatment planning these cephalometric norms should be the yardstick.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"113 - 118"},"PeriodicalIF":0.4,"publicationDate":"2020-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1820801","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47245963","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 : 2020-09-17DOI: 10.1080/13440241.2020.1820814
F. Martinelli, R. Luiz, M. T. Araújo
ABSTRACT Purpose The objective of this study was to assess the importance of orthodontic extractions in the setting of facial harmony to adolescents with bimaxillary protrusion. Material and methods: The orthodontic files of 73 adolescents with incisors protrusion treated with or without premolar extractions were studied on pre- and post-treatment facial photographs in a retrospective cohort study, while dental casts of 69 were assessed. The best-fit template of normal proportions was superimposed to the photograph and the facial harmony scores were obtained, while the DAI (dental aesthetic index) was studied in the models. Intra- and intergroup statistical comparisons and the index of improvement were determined. Results: The groups demonstrated significant change of lips positioning, though extraction group reached relative higher index of improvement. There was significant improvement in the labiomental groove position only for the extraction group in a profile view. Generally, a high success rate of dental relationships was found in the DAI. Conclusions: Both treatment protocols reached significant improvement of facial harmony. Orthodontic extractions of premolars might be related to establishing normal occlusion in cases with bimaxillary protrusion, while preventing worse hyperactive mental muscle when the arch discrepancy is negative. Abbreviations: 1-NA: Upper incisors cephalometric protrusion in millimetres; 1-NB: Lower incisors cephalometric protrusion in millimetres; AIR: Alare at right side; Al: Alare; AlL: Alare at left side; Ch: Cheillion; ChL: Cheillion at left side; ChR: Cheillion at right side; DAI: Dental Aesthetic Index; Ex: Exocanthion, posterior contour of the Orbitale; G: Glabela; Li: Inferior Lip; Ls: Superior Lip; Me: Menton; Msw: Midpoint of the craniofacial depth; OA: Anterior contour of the Orbitale; Ocp: Occipital; OL: Lower contour of the Orbitale; OU: Upper contour of the Orbitale; PLL: Pupil at left side; PLR: Pupil at right side; Pog: Pogonion; Sm: Labio-mental sulcus; Sn: Subnasale; Tr: Trichion; V: Vertex; ZyL: Zygion at left side; ZyR: Zygion at right side
{"title":"Extractions in the setting of facial harmony in adolescents with bimaxillary protrusion: a retrospective cohort study","authors":"F. Martinelli, R. Luiz, M. T. Araújo","doi":"10.1080/13440241.2020.1820814","DOIUrl":"https://doi.org/10.1080/13440241.2020.1820814","url":null,"abstract":"ABSTRACT Purpose The objective of this study was to assess the importance of orthodontic extractions in the setting of facial harmony to adolescents with bimaxillary protrusion. Material and methods: The orthodontic files of 73 adolescents with incisors protrusion treated with or without premolar extractions were studied on pre- and post-treatment facial photographs in a retrospective cohort study, while dental casts of 69 were assessed. The best-fit template of normal proportions was superimposed to the photograph and the facial harmony scores were obtained, while the DAI (dental aesthetic index) was studied in the models. Intra- and intergroup statistical comparisons and the index of improvement were determined. Results: The groups demonstrated significant change of lips positioning, though extraction group reached relative higher index of improvement. There was significant improvement in the labiomental groove position only for the extraction group in a profile view. Generally, a high success rate of dental relationships was found in the DAI. Conclusions: Both treatment protocols reached significant improvement of facial harmony. Orthodontic extractions of premolars might be related to establishing normal occlusion in cases with bimaxillary protrusion, while preventing worse hyperactive mental muscle when the arch discrepancy is negative. Abbreviations: 1-NA: Upper incisors cephalometric protrusion in millimetres; 1-NB: Lower incisors cephalometric protrusion in millimetres; AIR: Alare at right side; Al: Alare; AlL: Alare at left side; Ch: Cheillion; ChL: Cheillion at left side; ChR: Cheillion at right side; DAI: Dental Aesthetic Index; Ex: Exocanthion, posterior contour of the Orbitale; G: Glabela; Li: Inferior Lip; Ls: Superior Lip; Me: Menton; Msw: Midpoint of the craniofacial depth; OA: Anterior contour of the Orbitale; Ocp: Occipital; OL: Lower contour of the Orbitale; OU: Upper contour of the Orbitale; PLL: Pupil at left side; PLR: Pupil at right side; Pog: Pogonion; Sm: Labio-mental sulcus; Sn: Subnasale; Tr: Trichion; V: Vertex; ZyL: Zygion at left side; ZyR: Zygion at right side","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"119 - 125"},"PeriodicalIF":0.4,"publicationDate":"2020-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1820814","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42028260","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 : 2020-09-16DOI: 10.1080/13440241.2020.1820800
J. Storniolo-Souza, L. Lima, A. Pinzan, Fabiola Alvarez, Suelen Cristina da Costa Pereira, G. Janson
ABSTRACT Introduction The aim of this study was to analyse the orthodontic tooth movement rate and pain sensitivity during maxillary and mandibular canine retraction submitted to irradiation with low-level laser therapy (LLLT) in a monthly dose. Methods Eleven Class I malocclusion patients with extraction of the first maxillary and mandibular premolars were selected. Using a split-mouth, double-blind, placebo-controlled randomized design, LLLT irradiation was applied after canine initial retraction activation, performed with NiTi coil springs. Monthly, a couple of dental casts were obtained before laser application, which was subsequently scanned with the 3Shape Ortho System. The three-dimensional images were evaluated with Ortho Analyser software to measure the amount of movement of the retracted canines. The patients also used a visual analog scale after 12, 24, 48 and 72 hours of initial activation to assess pain sensitivity. Results There was only a significantly greater amount of retraction of the irradiated mandibular canines in the first month of laser application. There was no intergroup difference in pain sensitivity. Conclusion The LLLT application protocol showed only a statistically significant acceleration of tooth movement of the mandibular canines in the first month of application but did not produce any reduction in pain sensitivity.
{"title":"INFLUENCE OF LOW-LEVEL LASER IRRADIATION ON ORTHODONTIC MOVEMENT AND PAIN LEVEL - A RANDOMIZED CLINICAL TRIAL","authors":"J. Storniolo-Souza, L. Lima, A. Pinzan, Fabiola Alvarez, Suelen Cristina da Costa Pereira, G. Janson","doi":"10.1080/13440241.2020.1820800","DOIUrl":"https://doi.org/10.1080/13440241.2020.1820800","url":null,"abstract":"ABSTRACT Introduction The aim of this study was to analyse the orthodontic tooth movement rate and pain sensitivity during maxillary and mandibular canine retraction submitted to irradiation with low-level laser therapy (LLLT) in a monthly dose. Methods Eleven Class I malocclusion patients with extraction of the first maxillary and mandibular premolars were selected. Using a split-mouth, double-blind, placebo-controlled randomized design, LLLT irradiation was applied after canine initial retraction activation, performed with NiTi coil springs. Monthly, a couple of dental casts were obtained before laser application, which was subsequently scanned with the 3Shape Ortho System. The three-dimensional images were evaluated with Ortho Analyser software to measure the amount of movement of the retracted canines. The patients also used a visual analog scale after 12, 24, 48 and 72 hours of initial activation to assess pain sensitivity. Results There was only a significantly greater amount of retraction of the irradiated mandibular canines in the first month of laser application. There was no intergroup difference in pain sensitivity. Conclusion The LLLT application protocol showed only a statistically significant acceleration of tooth movement of the mandibular canines in the first month of application but did not produce any reduction in pain sensitivity.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"105 - 112"},"PeriodicalIF":0.4,"publicationDate":"2020-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1820800","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47865964","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 : 2020-09-14DOI: 10.1080/13440241.2020.1814522
So Koizumi, Kazuhide Seimiya, Heetae Park, Toshifumi Nakashizu, Kazuya Suzuki, T. Otsuka, Masaru Kobayashi, Noriyuki Hoshi, K. Kimoto, Tetsutaro Yamaguchi
ABSTRACT Purpose: Retainers are crucial appliances for the long-term stabilityof occlusion after orthodontic treatment. However, patient discomfort or poor aesthetics often lead to a decline in compliance. Aiming to improve upon these qualities, this article illustrates anovel method for manufacturing a modified Hawley type retainer. Materials and methods: The proposed technique utilized a 3D printer. The acrylic plate was replaced by Co-Cr, and a clear and aesthetically pleasing organic polymer was used for the labial wire. Results: The modified Hawley retainer manufactured using the 3D metal printer could be fabricated with minimum thickness by using Co-Cr. In addition, the organic polymer wire enhanced theaesthetics. Conclusion: Our modified Hawley retainer has many advantages as a useful appliance that overcomes the drawbacks of conventional retainers. Although additional testing is required, patient comfortand ease of speaking after setting in the oral cavity are expected to be superior to those achieved with conventional retainers. The metal material has excellent durability and cleanliness, which brings great benefits to patients and orthodontists. Manufacturing with a 3D printer is expected to be an excellent alternative to conventional methods.
{"title":"A metal retainer manufactured by 3D printing","authors":"So Koizumi, Kazuhide Seimiya, Heetae Park, Toshifumi Nakashizu, Kazuya Suzuki, T. Otsuka, Masaru Kobayashi, Noriyuki Hoshi, K. Kimoto, Tetsutaro Yamaguchi","doi":"10.1080/13440241.2020.1814522","DOIUrl":"https://doi.org/10.1080/13440241.2020.1814522","url":null,"abstract":"ABSTRACT Purpose: Retainers are crucial appliances for the long-term stabilityof occlusion after orthodontic treatment. However, patient discomfort or poor aesthetics often lead to a decline in compliance. Aiming to improve upon these qualities, this article illustrates anovel method for manufacturing a modified Hawley type retainer. Materials and methods: The proposed technique utilized a 3D printer. The acrylic plate was replaced by Co-Cr, and a clear and aesthetically pleasing organic polymer was used for the labial wire. Results: The modified Hawley retainer manufactured using the 3D metal printer could be fabricated with minimum thickness by using Co-Cr. In addition, the organic polymer wire enhanced theaesthetics. Conclusion: Our modified Hawley retainer has many advantages as a useful appliance that overcomes the drawbacks of conventional retainers. Although additional testing is required, patient comfortand ease of speaking after setting in the oral cavity are expected to be superior to those achieved with conventional retainers. The metal material has excellent durability and cleanliness, which brings great benefits to patients and orthodontists. Manufacturing with a 3D printer is expected to be an excellent alternative to conventional methods.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"95 - 98"},"PeriodicalIF":0.4,"publicationDate":"2020-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1814522","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41502037","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 : 2020-09-09DOI: 10.1080/13440241.2020.1814523
P. Paul, Anirudh Mathur, P. Chitra
ABSTRACT Purpose To evaluate cortical bone thickness in the infra zygomatic crest region for subjects with low, normal and high angle facial patterns by bone mapping using cone beam computed tomography. Material and methods The study was conducted using CBCT images of 33 subjects, who were assigned to low-, normal- or high-angle groups. Cortical bone thickness was measured from the cementoenamel junction towards the maxillary sinus floor at heights of 8, 10, 12 and 14 mm along the mesial aspect of upper first molar, middle of the crown through the furcation area of the maxillary first molar, inter radicular bone/interdental region between the maxillary first and second molars, middle of the crown through the furcation area of the maxillary second molar and distal of the maxillary second molar. Results Low angle patients had significantly higher values of bone thickness compared to normal and high-angle patients between the first and second molars at a height of 12 mm and distal to second molars at a height of 14 mm. Conclusion The ideal site for insertion of temporary anchorage devices in the infrazygomatic crest region lies between the maxillary first and second molars at a height of 12 mm in all facial types. To avoid the risk of trauma or mini-implant failure, clinicians should be aware of the probability of thinner cortical bone in high angle patients as compared to normal and low angle patients.
{"title":"Cone beam computed tomographic comparison of infrazygomatic crest bone thickness in patients with different facial types","authors":"P. Paul, Anirudh Mathur, P. Chitra","doi":"10.1080/13440241.2020.1814523","DOIUrl":"https://doi.org/10.1080/13440241.2020.1814523","url":null,"abstract":"ABSTRACT Purpose To evaluate cortical bone thickness in the infra zygomatic crest region for subjects with low, normal and high angle facial patterns by bone mapping using cone beam computed tomography. Material and methods The study was conducted using CBCT images of 33 subjects, who were assigned to low-, normal- or high-angle groups. Cortical bone thickness was measured from the cementoenamel junction towards the maxillary sinus floor at heights of 8, 10, 12 and 14 mm along the mesial aspect of upper first molar, middle of the crown through the furcation area of the maxillary first molar, inter radicular bone/interdental region between the maxillary first and second molars, middle of the crown through the furcation area of the maxillary second molar and distal of the maxillary second molar. Results Low angle patients had significantly higher values of bone thickness compared to normal and high-angle patients between the first and second molars at a height of 12 mm and distal to second molars at a height of 14 mm. Conclusion The ideal site for insertion of temporary anchorage devices in the infrazygomatic crest region lies between the maxillary first and second molars at a height of 12 mm in all facial types. To avoid the risk of trauma or mini-implant failure, clinicians should be aware of the probability of thinner cortical bone in high angle patients as compared to normal and low angle patients.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"99 - 104"},"PeriodicalIF":0.4,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1814523","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46295069","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：