Pub Date : 2021-07-03DOI: 10.1080/13440241.2021.1959885
Tomohiro Ebisawa, Hidenori Katada, K. Sueishi, Y. Nishii
ABSTRACT Purpose The purpose of this study was to biomechanically evaluate maxillary protraction using an orthodontic anchor screw. We conducted three-dimensional finite element analysis to determine the initial displacement and stress distribution during maxillary protraction by comparing a conventional method involving fixation on teeth with maxillary protraction using an orthodontic anchor screw. Materials and methods We used X-ray computed tomography data obtained from Hellman Dental Age IIIA dry human skulls to create a skeletal anchorage model and a dental anchorage model as finite element models. In each model, a load of 6 N was applied in the anteroinferior direction at 0°, 10°, 20°, 30°, and 40° to the occlusal plane by means of a traction hook and the initial displacement and stress distribution were analysed. Results For the anterior nasal spine (ANS) sagittal displacement was greater in the skeletal anchorage model than in the dental anchorage model. In the central incisors and first molars, greater sagittal displacement was observed in the dental anchorage model compared with the skeletal anchorage model. In both models, vertical displacement was 20°, indicating maximum suppression of rotation in the maxilla. The zygomaticomaxillary and zygomaticofrontal sutures demonstrated high stress at 0° and 10° in the dental anchorage model, and at 20°, 30°, and 40° in the skeletal anchorage model. Conclusions These results indicate that tooth and bone–borne maxillary protraction using an orthodontic anchor screw inserted in the palatal region may be of value for the early mixed dentition period in patients with maxillary deficiency.
摘要目的本研究的目的是对使用正畸锚钉的上颌前伸进行生物力学评估。我们进行了三维有限元分析，通过比较传统的牙齿固定方法和使用正畸锚钉的上颌前伸方法，来确定上颌前伸过程中的初始位移和应力分布。材料和方法我们使用从Hellman Dental Age IIIA干燥人类头骨获得的X射线计算机断层扫描数据来创建骨骼锚定模型和牙齿锚定模型作为有限元模型。在每个模型中，通过牵引钩在咬合平面0°、10°、20°、30°和40°的前后方向上施加6N的载荷，并分析初始位移和应力分布。结果对于鼻前棘（ANS），骨锚定模型的矢状位位移大于牙锚定模型。在中切牙和第一磨牙中，与骨骼锚定模型相比，在牙齿锚定模型中观察到更大的矢状位移。在这两个模型中，垂直位移均为20°，表明上颌骨旋转受到最大抑制。在牙锚定模型中，颧颌和颧侧缝合线在0°和10°处表现出高应力，在骨骼锚定模型的20°、30°和40°处表现为高应力。结论这些结果表明，在腭部插入正畸锚钉的牙齿和骨源性上颌前牵引可能对上颌缺失患者的早期混合牙列期有价值。
{"title":"Biomechanical evaluation of maxillary protraction with an orthodontic anchor screw: a three-dimensional finite element analysis","authors":"Tomohiro Ebisawa, Hidenori Katada, K. Sueishi, Y. Nishii","doi":"10.1080/13440241.2021.1959885","DOIUrl":"https://doi.org/10.1080/13440241.2021.1959885","url":null,"abstract":"ABSTRACT Purpose The purpose of this study was to biomechanically evaluate maxillary protraction using an orthodontic anchor screw. We conducted three-dimensional finite element analysis to determine the initial displacement and stress distribution during maxillary protraction by comparing a conventional method involving fixation on teeth with maxillary protraction using an orthodontic anchor screw. Materials and methods We used X-ray computed tomography data obtained from Hellman Dental Age IIIA dry human skulls to create a skeletal anchorage model and a dental anchorage model as finite element models. In each model, a load of 6 N was applied in the anteroinferior direction at 0°, 10°, 20°, 30°, and 40° to the occlusal plane by means of a traction hook and the initial displacement and stress distribution were analysed. Results For the anterior nasal spine (ANS) sagittal displacement was greater in the skeletal anchorage model than in the dental anchorage model. In the central incisors and first molars, greater sagittal displacement was observed in the dental anchorage model compared with the skeletal anchorage model. In both models, vertical displacement was 20°, indicating maximum suppression of rotation in the maxilla. The zygomaticomaxillary and zygomaticofrontal sutures demonstrated high stress at 0° and 10° in the dental anchorage model, and at 20°, 30°, and 40° in the skeletal anchorage model. Conclusions These results indicate that tooth and bone–borne maxillary protraction using an orthodontic anchor screw inserted in the palatal region may be of value for the early mixed dentition period in patients with maxillary deficiency.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"149 - 160"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43510091","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: 10.1080/13440241.2021.1951515
Sandeep Talluri, Suma M Palaparthi, Basir A. Barmak, J. Khan
ABSTRACT Purpose The objective of the current study was to assess the effectiveness of photobiomodulation in managing gingival inflammation in patients undergoing orthodontic treatment. Materials and Methods The addressed focus question was ‘Is photobiomodulation effective in treating gingival inflammation in patients undergoing orthodontic treatment?’ Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) model, indexed databases were searched up to and including January 2021. The risk of bias (ROB) was assessed using Joanna Briggs critical appraisal tool. Results Eight studies which included, six randomized controlled trials (RCTs) and two clinical trials were included in the review. All the studies reported that PBM can be used in the management of gingival inflammation during or after the orthodontic treatment, but two studies reported that there is no difference between lasers and conventional scalpel therapy. Overall, the risk of bias was low for six studies and moderate for two studies. Conclusion The efficacy of photobiomodulation in the management of gingival enlargement during orthodontic treatment is debatable as the heterogeneity associated with the included studies is high. Overall, majority of the studies are supportive and the conclusion of the present review indicates that photobiomodulation can be used as an adjunct tool for managing gingivitis during orthodontic treatment. Further, well-designed RCTs are needed.
{"title":"The efficacy of photobiomodulation in the management of gingivitis during orthodontic treatment: A systematic review of clinical studies","authors":"Sandeep Talluri, Suma M Palaparthi, Basir A. Barmak, J. Khan","doi":"10.1080/13440241.2021.1951515","DOIUrl":"https://doi.org/10.1080/13440241.2021.1951515","url":null,"abstract":"ABSTRACT Purpose The objective of the current study was to assess the effectiveness of photobiomodulation in managing gingival inflammation in patients undergoing orthodontic treatment. Materials and Methods The addressed focus question was ‘Is photobiomodulation effective in treating gingival inflammation in patients undergoing orthodontic treatment?’ Using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) model, indexed databases were searched up to and including January 2021. The risk of bias (ROB) was assessed using Joanna Briggs critical appraisal tool. Results Eight studies which included, six randomized controlled trials (RCTs) and two clinical trials were included in the review. All the studies reported that PBM can be used in the management of gingival inflammation during or after the orthodontic treatment, but two studies reported that there is no difference between lasers and conventional scalpel therapy. Overall, the risk of bias was low for six studies and moderate for two studies. Conclusion The efficacy of photobiomodulation in the management of gingival enlargement during orthodontic treatment is debatable as the heterogeneity associated with the included studies is high. Overall, majority of the studies are supportive and the conclusion of the present review indicates that photobiomodulation can be used as an adjunct tool for managing gingivitis during orthodontic treatment. Further, well-designed RCTs are needed.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"107 - 116"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1951515","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44763957","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: 10.1080/13440241.2021.1942611
P. B, R. Jain, Purva Verma, Akriti Tiwari, S. Shankar
ABSTRACT Aim: To evaluate and compare occlusal contact force distribution, occlusion time and disclusion time following wear of Begg’s wrap around retainer and Vacuum formed retainer after completion of orthodontic treatment using a T-scan III. Materials and Methods: Twenty subjects after completion of active orthodontic treatment were randomly allocated into two groups, Group I – Begg’s wrap-around retainer (n-10) and Group II–vacuum formed retainer (n-10) one patient was lost to follow up in each group and the final sample size assessed at T1 in each group was 9. T-scan III was used at two-time intervals, T0 – first scan taken immediately after debonding and T1 – taken during retention any time between 10 and 12 months. Comparison of parameters within the groups was done using paired t-test and comparison between the groups was done using independent t-test. Results: No statistically significant difference in the distribution of occlusal contact forces was noted in both groups at T0 and T1 (p value<0.05). Disclusion time reduced in both groups at T1 but a statistically significant reduction in the disclusion time of left lateral excursive movement and protrusive movements (p value<0.05) was noted (T0-T1) in Group I. Statistically significant increase in the occlusion time was noted in Group II (T0-T1) at T1 between the two groups. Conclusion: No differences in occlusal contact force distribution was noted within and between the two groups. Disclusion time reduced in subjects on Begg’s wrap around retainers indicating favourable muscle activity and Occlusion time increased in subjects on vacuum formed retainers.
{"title":"Computerized occlusal analysis of two different removable retainers used during retention phase- A Randomized controlled trial","authors":"P. B, R. Jain, Purva Verma, Akriti Tiwari, S. Shankar","doi":"10.1080/13440241.2021.1942611","DOIUrl":"https://doi.org/10.1080/13440241.2021.1942611","url":null,"abstract":"ABSTRACT Aim: To evaluate and compare occlusal contact force distribution, occlusion time and disclusion time following wear of Begg’s wrap around retainer and Vacuum formed retainer after completion of orthodontic treatment using a T-scan III. Materials and Methods: Twenty subjects after completion of active orthodontic treatment were randomly allocated into two groups, Group I – Begg’s wrap-around retainer (n-10) and Group II–vacuum formed retainer (n-10) one patient was lost to follow up in each group and the final sample size assessed at T1 in each group was 9. T-scan III was used at two-time intervals, T0 – first scan taken immediately after debonding and T1 – taken during retention any time between 10 and 12 months. Comparison of parameters within the groups was done using paired t-test and comparison between the groups was done using independent t-test. Results: No statistically significant difference in the distribution of occlusal contact forces was noted in both groups at T0 and T1 (p value<0.05). Disclusion time reduced in both groups at T1 but a statistically significant reduction in the disclusion time of left lateral excursive movement and protrusive movements (p value<0.05) was noted (T0-T1) in Group I. Statistically significant increase in the occlusion time was noted in Group II (T0-T1) at T1 between the two groups. Conclusion: No differences in occlusal contact force distribution was noted within and between the two groups. Disclusion time reduced in subjects on Begg’s wrap around retainers indicating favourable muscle activity and Occlusion time increased in subjects on vacuum formed retainers.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"125 - 133"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1942611","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42320098","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: 10.1080/13440241.2021.1952392
Tomoyo Tanaka, M. Hoshijima, Norie Yoshioka, H. Kamioka
ABSTRACT To treat facial asymmetry with severe inclination of the frontal occlusal plane, unilateral maxillary impaction in the molar region must be performed to reposition the maxilla. We herein report the successful surgical-orthodontic treatment of a patient with facial asymmetry and significant canted occlusal plane by LeFort I combined with unilateral horseshoe osteotomy and mandibular bilateral intraoral vertical ramus osteotomy (IVRO). A 20-year-old male patient had a chief complaint of mandibular protrusion and mandibular dental crowding. The total active treatment period was 31 months. After postsurgical orthodontic treatment, the right side of the maxilla was impacted by 4.0 mm, while the left side was maintained vertically. The facial asymmetry and canted occlusal plane had mostly improved and satisfactory occlusion, and a straight-type profile had been obtained. In addition, the condylar path length was increased during maximum reciprocal jaw movement, and the incisal path became stable during lateral excursion. Acceptable occlusion and a satisfactory facial profile were maintained after the two-year retention period. Our results suggest that the combination of LeFort I with unilateral horseshoe osteotomy is a useful technique for achieving reliable, superior repositioning of maxillae with a severe cant.
{"title":"A skeletal Class III facial asymmetry case with a canted occlusal plane treated by LeFort I with unilateral horseshoe osteotomy","authors":"Tomoyo Tanaka, M. Hoshijima, Norie Yoshioka, H. Kamioka","doi":"10.1080/13440241.2021.1952392","DOIUrl":"https://doi.org/10.1080/13440241.2021.1952392","url":null,"abstract":"ABSTRACT To treat facial asymmetry with severe inclination of the frontal occlusal plane, unilateral maxillary impaction in the molar region must be performed to reposition the maxilla. We herein report the successful surgical-orthodontic treatment of a patient with facial asymmetry and significant canted occlusal plane by LeFort I combined with unilateral horseshoe osteotomy and mandibular bilateral intraoral vertical ramus osteotomy (IVRO). A 20-year-old male patient had a chief complaint of mandibular protrusion and mandibular dental crowding. The total active treatment period was 31 months. After postsurgical orthodontic treatment, the right side of the maxilla was impacted by 4.0 mm, while the left side was maintained vertically. The facial asymmetry and canted occlusal plane had mostly improved and satisfactory occlusion, and a straight-type profile had been obtained. In addition, the condylar path length was increased during maximum reciprocal jaw movement, and the incisal path became stable during lateral excursion. Acceptable occlusion and a satisfactory facial profile were maintained after the two-year retention period. Our results suggest that the combination of LeFort I with unilateral horseshoe osteotomy is a useful technique for achieving reliable, superior repositioning of maxillae with a severe cant.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"171 - 183"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1952392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47948986","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: 10.1080/13440241.2021.1937785
T. Al-Gunaid, Abdullah Khaled Sunitan, Abdullah Bader Alharbi, Emad Ali Alhrbei, I. Saito
ABSTRACT Purpose: This study aims to explore the possible relationship between mandibular dimensions and bite force. Subjects and Methods: Forty-one subjects (mean age 22.4 ± 1.6 years) were recruited from a pool of dental students and patients seeking dental treatment at the outpatient clinics, College of Dentistry, Taibah University. Digital panoramic radiographs were used and five angular and eleven linear measurements were taken. Comparisons were drawn between right and left sides and eating and non-eating sides using the Mann–Whitney test. Pearson correlation and multiple regression tests were used to assess the existence of any relationship between the bite force and mandibular dimensions. Results: No significant variations were detected in the bite force measurements between the right and left sides or between the eating and non-eating sides. Significant correlations were found between average and maximum posterior bite force and the inclinations of the lower first molar and the lower canine. Conclusion: No relationship exists between the mandibular dimensions and bite force except that the posterior bite force positively correlated with the inclinations of molars and canines.
{"title":"Relationship between mandibular dimensions and bite force: an exploratory study","authors":"T. Al-Gunaid, Abdullah Khaled Sunitan, Abdullah Bader Alharbi, Emad Ali Alhrbei, I. Saito","doi":"10.1080/13440241.2021.1937785","DOIUrl":"https://doi.org/10.1080/13440241.2021.1937785","url":null,"abstract":"ABSTRACT Purpose: This study aims to explore the possible relationship between mandibular dimensions and bite force. Subjects and Methods: Forty-one subjects (mean age 22.4 ± 1.6 years) were recruited from a pool of dental students and patients seeking dental treatment at the outpatient clinics, College of Dentistry, Taibah University. Digital panoramic radiographs were used and five angular and eleven linear measurements were taken. Comparisons were drawn between right and left sides and eating and non-eating sides using the Mann–Whitney test. Pearson correlation and multiple regression tests were used to assess the existence of any relationship between the bite force and mandibular dimensions. Results: No significant variations were detected in the bite force measurements between the right and left sides or between the eating and non-eating sides. Significant correlations were found between average and maximum posterior bite force and the inclinations of the lower first molar and the lower canine. Conclusion: No relationship exists between the mandibular dimensions and bite force except that the posterior bite force positively correlated with the inclinations of molars and canines.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"117 - 123"},"PeriodicalIF":0.4,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1937785","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47131503","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 : 2021-06-16DOI: 10.1080/13440241.2021.1940749
A. Venugopal, M. S. Ghoussoub, Paolo Manzano, Prateek Mehta, Anand Marya, Nikhilesh R Vaid, B. Ludwig, S. Bowman
ABSTRACT Outcome: This case reports the successful treatment of a 40-year-old female with a skeletal Class III malocclusion and knife-edge residual ridges by successfully protracting the lower molars orthodontically.Objectives: On a long-standing extraction space, resorption results in a decrease in the vertical height of the bone, but more importantly, remodelling produces a buccolingual narrowing of the alveolar process as well. Moving teeth into this area is considered almost impossible due to the anatomical limitations. This case places special emphasis on factors to be considered while levelling the curve of Spee on a patient with a very steep mandibular plane, by controlling posterior teeth extrusion, and at the same time elaborates on the biomechanics of molar protraction.Conclusion: In all, the apt use of calculated biomechanical strategies helped in achieving an acceptable, functional and esthetic occlusion in a conservative non-surgical line of treatment.
{"title":"Molar protraction on an adult with severe high-angle Class III malocclusion and knife-edge residual ridges","authors":"A. Venugopal, M. S. Ghoussoub, Paolo Manzano, Prateek Mehta, Anand Marya, Nikhilesh R Vaid, B. Ludwig, S. Bowman","doi":"10.1080/13440241.2021.1940749","DOIUrl":"https://doi.org/10.1080/13440241.2021.1940749","url":null,"abstract":"ABSTRACT Outcome: This case reports the successful treatment of a 40-year-old female with a skeletal Class III malocclusion and knife-edge residual ridges by successfully protracting the lower molars orthodontically.Objectives: On a long-standing extraction space, resorption results in a decrease in the vertical height of the bone, but more importantly, remodelling produces a buccolingual narrowing of the alveolar process as well. Moving teeth into this area is considered almost impossible due to the anatomical limitations. This case places special emphasis on factors to be considered while levelling the curve of Spee on a patient with a very steep mandibular plane, by controlling posterior teeth extrusion, and at the same time elaborates on the biomechanics of molar protraction.Conclusion: In all, the apt use of calculated biomechanical strategies helped in achieving an acceptable, functional and esthetic occlusion in a conservative non-surgical line of treatment.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"161 - 169"},"PeriodicalIF":0.4,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1940749","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48482689","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 : 2021-04-03DOI: 10.1080/13440241.2021.1924417
Prasanna Arvind T.R., A. Felicita
ABSTRACT Purpose: Significance of analysing collum angle in class II malocclusions with respect to lip position may lend greater credibility to variable torque brackets (mainly in the anteriors) that are fast gaining traction. Determine the magnitude of collum angle of maxillary central incisors in Class II division 1, division 2 malocclusions and changes in measurement brought about by variations in lower lip position and incisal contact. Materials and methods: 154 lateral cephalograms were divided into three groups- 55(Angle’s class I), 52 (Angle’s class II division 1) and 47 (Angle’s class II division 2). The collum angle was measured along with lower lip line (in Class II division 2) and lower lip contact (in Class II division 1) malocclusions. Results: The mean collum angles were 2.12 ± 1.43°, −0.84 ± 0.87° and 4.67 ± 2.23° in Groups 1, 2, and 3, respectively. Mean collum angle is significantly increased when the lower lip was found to contact the middle-third of the central incisor(in Group 3)and significantly decreased when the anterior one-third of the lower lip was in contact with the incisal edge of the central incisor (in Group 2). ANOVA followed by Tukey HSD test was carried out to determine statistically significant differences (p < 0.05). Conclusion: Collum angle is significantly decreased in Class II division 1 malocclusions necessitating variable torque prescriptions and segmental mechanics of maxillary anteriors. Appropriate alveolar bone support must be assessed prior to en-masse retraction and intrusion respecting the cortical boundaries. KEY MESSAGES: Variable torque brackets are rapidly gaining credence for their ability to provide sufficient alveolar bone support in different clinical scenarios. In this study, we have emphasized upon utilizing similar mechanics to treat class II malocclusions by utilizing the lower lip position as a reference guide.
{"title":"Correlation between collum angle and lower lip position in different Class II malocclusions - A retrospective cephalometric study","authors":"Prasanna Arvind T.R., A. Felicita","doi":"10.1080/13440241.2021.1924417","DOIUrl":"https://doi.org/10.1080/13440241.2021.1924417","url":null,"abstract":"ABSTRACT Purpose: Significance of analysing collum angle in class II malocclusions with respect to lip position may lend greater credibility to variable torque brackets (mainly in the anteriors) that are fast gaining traction. Determine the magnitude of collum angle of maxillary central incisors in Class II division 1, division 2 malocclusions and changes in measurement brought about by variations in lower lip position and incisal contact. Materials and methods: 154 lateral cephalograms were divided into three groups- 55(Angle’s class I), 52 (Angle’s class II division 1) and 47 (Angle’s class II division 2). The collum angle was measured along with lower lip line (in Class II division 2) and lower lip contact (in Class II division 1) malocclusions. Results: The mean collum angles were 2.12 ± 1.43°, −0.84 ± 0.87° and 4.67 ± 2.23° in Groups 1, 2, and 3, respectively. Mean collum angle is significantly increased when the lower lip was found to contact the middle-third of the central incisor(in Group 3)and significantly decreased when the anterior one-third of the lower lip was in contact with the incisal edge of the central incisor (in Group 2). ANOVA followed by Tukey HSD test was carried out to determine statistically significant differences (p < 0.05). Conclusion: Collum angle is significantly decreased in Class II division 1 malocclusions necessitating variable torque prescriptions and segmental mechanics of maxillary anteriors. Appropriate alveolar bone support must be assessed prior to en-masse retraction and intrusion respecting the cortical boundaries. KEY MESSAGES: Variable torque brackets are rapidly gaining credence for their ability to provide sufficient alveolar bone support in different clinical scenarios. In this study, we have emphasized upon utilizing similar mechanics to treat class II malocclusions by utilizing the lower lip position as a reference guide.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"81 - 86"},"PeriodicalIF":0.4,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1924417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42048343","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 : 2021-04-03DOI: 10.1080/13440241.2021.1927623
Nguyen Viet Anh, N. T. Tra, N. Hanh
ABSTRACT Purpose: This case report describes the lingual orthodontic treatment of an adult skeletal Class II division 1 patient with lip protrusion, mandibular retrusion, severe overjet and deep overbite, proclined upper and lower incisors and mild crowding in both arches. Materials and methods: The overjet was corrected with upper first premolar extraction with the help of skeletal absolute anchorage. Also, 4 third molars were extracted and miniscrew-assisted total distalization was performed in mandibular arch to decrease the proclination of lower incisors after aligning and levelling. Results: After 25-month treatment, satisfactory facial aesthetics and good occlusion were achieved. A two-year follow-up after confirmed that the outcome was stable. Conclusion: Maxillary first premolar extraction combined with total arch distalization with skeletal anchorage could greatly reduce the excessive overjet and lip protrusion in skeletal Class II cases.
{"title":"Lingual orthodontic treatment of a skeletal class II patient with miniscrew-assisted absolute anchorage in maxillary arch and total distalization in mandibular arch: a case report","authors":"Nguyen Viet Anh, N. T. Tra, N. Hanh","doi":"10.1080/13440241.2021.1927623","DOIUrl":"https://doi.org/10.1080/13440241.2021.1927623","url":null,"abstract":"ABSTRACT Purpose: This case report describes the lingual orthodontic treatment of an adult skeletal Class II division 1 patient with lip protrusion, mandibular retrusion, severe overjet and deep overbite, proclined upper and lower incisors and mild crowding in both arches. Materials and methods: The overjet was corrected with upper first premolar extraction with the help of skeletal absolute anchorage. Also, 4 third molars were extracted and miniscrew-assisted total distalization was performed in mandibular arch to decrease the proclination of lower incisors after aligning and levelling. Results: After 25-month treatment, satisfactory facial aesthetics and good occlusion were achieved. A two-year follow-up after confirmed that the outcome was stable. Conclusion: Maxillary first premolar extraction combined with total arch distalization with skeletal anchorage could greatly reduce the excessive overjet and lip protrusion in skeletal Class II cases.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"97 - 106"},"PeriodicalIF":0.4,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1927623","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41986519","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 : 2021-04-03DOI: 10.1080/13440241.2021.1924418
A. Murakami, Hitoshi Kawanabe, Hisashi Hosoya, Kazunori Fukui
ABSTRACT Purpose : In children, snoring and apnoea cause impairments in growth, cognitive function, attention, and school performance. In this study, we aimed to identify the association between craniofacial disharmony and paediatric sleep-disordered breathing. Materials and Methods : Forty-one patients with malocclusion (19 boys; 22 girls; mean age, 10.0 ± 2.1 years) were selected from our hospital. The relationship between maxillofacial morphology, pharyngeal airway form, and nasal respiratory function was examined using cephalometric analysis and skeletal patterns. All patients underwent portable monitoring with an overnight out-of-centre sleep testing protocol that could be performed at home using a portable computerized monitoring system. Results : The respiratory disturbance index was significantly greater in patients with mandibular retrusion than those with malocclusion. Arterial oxygen saturation and nasopharyngeal area were significantly smaller in participants with Class II malocclusion than in those with other types of malocclusion. Moreover, dental cast model analyses confirmed that patients with reduced transverse maxillary dimensions had a higher obstructive sleep apnoea syndrome (OSAS) risk than those with malocclusion. Therefore, patients with mandibular retrusion have a higher OSAS risk than those with other types of malocclusion. Conclusion : Childhood maxillofacial morphology may influence adult OSAS, and early treatment for children with OSAS may help prevent adult OSAS.
{"title":"Effect of sleep-disturbed breathing on maxillofacial growth and development in school-aged children","authors":"A. Murakami, Hitoshi Kawanabe, Hisashi Hosoya, Kazunori Fukui","doi":"10.1080/13440241.2021.1924418","DOIUrl":"https://doi.org/10.1080/13440241.2021.1924418","url":null,"abstract":"ABSTRACT Purpose : In children, snoring and apnoea cause impairments in growth, cognitive function, attention, and school performance. In this study, we aimed to identify the association between craniofacial disharmony and paediatric sleep-disordered breathing. Materials and Methods : Forty-one patients with malocclusion (19 boys; 22 girls; mean age, 10.0 ± 2.1 years) were selected from our hospital. The relationship between maxillofacial morphology, pharyngeal airway form, and nasal respiratory function was examined using cephalometric analysis and skeletal patterns. All patients underwent portable monitoring with an overnight out-of-centre sleep testing protocol that could be performed at home using a portable computerized monitoring system. Results : The respiratory disturbance index was significantly greater in patients with mandibular retrusion than those with malocclusion. Arterial oxygen saturation and nasopharyngeal area were significantly smaller in participants with Class II malocclusion than in those with other types of malocclusion. Moreover, dental cast model analyses confirmed that patients with reduced transverse maxillary dimensions had a higher obstructive sleep apnoea syndrome (OSAS) risk than those with malocclusion. Therefore, patients with mandibular retrusion have a higher OSAS risk than those with other types of malocclusion. Conclusion : Childhood maxillofacial morphology may influence adult OSAS, and early treatment for children with OSAS may help prevent adult OSAS.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"87 - 95"},"PeriodicalIF":0.4,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1924418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41518313","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 : 2021-04-03DOI: 10.1080/13440241.2021.1902061
T. Hoyte, Anil Ali, D. Bearn
ABSTRACT Aim This systematic review aimed to identify the most effective anchorage methods producing better skeletal, dental, aesthetic and patient experience outcomes in the treatment of bimaxillary protrusion. Methods Electronic databases (Pubmed, Medline, Scopus, and Cochrane library) were searched without language restrictions. Unpublished studies were searched for on clinicaltrials.gov. Search terms included bimaxillary proclination, bimaxillary dentoalveolar protrusion, biprotrusion, bimaxillary prognathism, bimaxillary protrusion, and bidental. Treatment studies on patients with bimaxillary protrusion were included. Relevant articles were assessed for quality according to Cochrane guidelines and the data extracted for statistical analysis. Using predefined forms two authors assessed eligibility for inclusion in the study and any disagreement was discussed. Cochrane Risk of Bias tool was used for quality assessment and GRADE was used to assess the quality of the evidence. Results Four studies met the inclusion criteria, while 32 were excluded based on study design and/or no outcome of interest reported. Only three studies were included in the random-effects meta-analysis. There was some evidence to suggest that the use of TADs resulted in less anchorage loss than traditional anchorage techniques (mean difference 2.38 mm; 95% CI, −3.89 to −0.88; P = 0.002). There was a significant difference in treatment duration with use of TADs (mean difference 0.92 months; 95% CI −1.64 to- 0.21; P = 0.01). Conclusion There is very low-quality evidence to suggest TADs provide better anchorage and shorter treatment duration in the orthodontic treatment of bimaxillary protrusion.
{"title":"Anchorage methods and treatment outcomes in the treatment of bimaxillary protrusion: a systematic review and meta-analysis","authors":"T. Hoyte, Anil Ali, D. Bearn","doi":"10.1080/13440241.2021.1902061","DOIUrl":"https://doi.org/10.1080/13440241.2021.1902061","url":null,"abstract":"ABSTRACT Aim This systematic review aimed to identify the most effective anchorage methods producing better skeletal, dental, aesthetic and patient experience outcomes in the treatment of bimaxillary protrusion. Methods Electronic databases (Pubmed, Medline, Scopus, and Cochrane library) were searched without language restrictions. Unpublished studies were searched for on clinicaltrials.gov. Search terms included bimaxillary proclination, bimaxillary dentoalveolar protrusion, biprotrusion, bimaxillary prognathism, bimaxillary protrusion, and bidental. Treatment studies on patients with bimaxillary protrusion were included. Relevant articles were assessed for quality according to Cochrane guidelines and the data extracted for statistical analysis. Using predefined forms two authors assessed eligibility for inclusion in the study and any disagreement was discussed. Cochrane Risk of Bias tool was used for quality assessment and GRADE was used to assess the quality of the evidence. Results Four studies met the inclusion criteria, while 32 were excluded based on study design and/or no outcome of interest reported. Only three studies were included in the random-effects meta-analysis. There was some evidence to suggest that the use of TADs resulted in less anchorage loss than traditional anchorage techniques (mean difference 2.38 mm; 95% CI, −3.89 to −0.88; P = 0.002). There was a significant difference in treatment duration with use of TADs (mean difference 0.92 months; 95% CI −1.64 to- 0.21; P = 0.01). Conclusion There is very low-quality evidence to suggest TADs provide better anchorage and shorter treatment duration in the orthodontic treatment of bimaxillary protrusion.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"55 - 64"},"PeriodicalIF":0.4,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1902061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43672327","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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