Abstract Background/Objective The Tanaka and Johnston mixed dentition analysis is a widely used method to predict the size of unerupted permanent canines and premolars. The aim of the present study was to determine the applicability of the Tanaka and Johnston analysis to Western Australian adolescents and develop a new regression equation. Methods Five hundred participants (323 females, 177 males) meeting the inclusion criteria were selected from private orthodontic clinics. The mesiodistal dimensions of all permanent teeth were retrieved from pre-orthodontic treatment digital dental records using Invisalign® technology (Invisalign®, Align Technology, Santa Clara, CA, USA) and analysed using a predicted value derived from the Tanaka and Johnston analysis. Correlation and linear regression analyses were applied to develop new regression equations. Result A significant difference was found between the actual and predicted values derived from the Tanaka and Johnston analysis. A significant correlation was observed between the sum of the permanent mandibular incisors and the sum of the maxillary and mandibular canine and premolars (0.58–0.74). New regression equations and tables were derived from the study population. Conclusion The Tanaka and Johnston analysis overestimated the mesiodistal dimensions of permanent canines and premolars. The developed regression equation and tables may be used for orthodontic diagnosis and treatment planning in Western Australian adolescents.
{"title":"The applicability of the Tanaka and Johnston analysis in a contemporary Western Australian population","authors":"S. Abaid, S. Zafar, E. Kruger, M. Tennant","doi":"10.21307/aoj-2022.0018","DOIUrl":"https://doi.org/10.21307/aoj-2022.0018","url":null,"abstract":"Abstract Background/Objective The Tanaka and Johnston mixed dentition analysis is a widely used method to predict the size of unerupted permanent canines and premolars. The aim of the present study was to determine the applicability of the Tanaka and Johnston analysis to Western Australian adolescents and develop a new regression equation. Methods Five hundred participants (323 females, 177 males) meeting the inclusion criteria were selected from private orthodontic clinics. The mesiodistal dimensions of all permanent teeth were retrieved from pre-orthodontic treatment digital dental records using Invisalign® technology (Invisalign®, Align Technology, Santa Clara, CA, USA) and analysed using a predicted value derived from the Tanaka and Johnston analysis. Correlation and linear regression analyses were applied to develop new regression equations. Result A significant difference was found between the actual and predicted values derived from the Tanaka and Johnston analysis. A significant correlation was observed between the sum of the permanent mandibular incisors and the sum of the maxillary and mandibular canine and premolars (0.58–0.74). New regression equations and tables were derived from the study population. Conclusion The Tanaka and Johnston analysis overestimated the mesiodistal dimensions of permanent canines and premolars. The developed regression equation and tables may be used for orthodontic diagnosis and treatment planning in Western Australian adolescents.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46799196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Purpose: To assess the changes in mandibular trabecular and cortical bone following functional appliance treatment through fractal dimension (FD) and cortical thickness (CorT) measurements. Material and methods The study was performed on 45 mandibular retrognathia cases. While the treatment group (T) comprised 30 patients treated using a functional appliance for one year during puberty, the control group (C) consisted of 15 patients who did not receive any orthodontic treatment due to insufficient oral hygiene. FD and CorT analyses were bilaterally evaluated for each mandible. FD measurements were performed on the condylar process, the antegonial notch, and ramus regions on panoramic radiographs. A paired t-test was applied for group analysis, before (T1) and after treatment (T2) and, correspondingly, before (C1) and after (C2) controls. In addition, an independent t-test was used to determine differences between the treatment (∆T = T2−T1) and the control group (∆C = C2−C1). Results Statistically significant differences were found in the treatment group between the initial and post-treatment FD values of the right (p < 0.05) and left condyles (p < 0.05), and the CorT measurements on the right (p < 0.01) and the left sides (p < 0.05). There was no statistically significant difference in FD parameters in the control group and a significant difference was only found in the left CorT (p < 0.05). A comparison of the treatment and control groups revealed that the changes in FD and CorT measurements were not statistically significantly different between the groups (p > 0.05). Conclusion: Mandibular protraction appliances do not produce trabecular bone alteration in the mandibular condyles, the antegonial notch and ramus over a 12-month time period.
{"title":"Evaluation of architectural changes in mandibular trabecular and cortical bone pattern after functional treatment","authors":"Barcın Eroz Dilaver, Dilara Nil Günaçar, A. Kiki","doi":"10.2478/aoj-2022.0037","DOIUrl":"https://doi.org/10.2478/aoj-2022.0037","url":null,"abstract":"Abstract Purpose: To assess the changes in mandibular trabecular and cortical bone following functional appliance treatment through fractal dimension (FD) and cortical thickness (CorT) measurements. Material and methods The study was performed on 45 mandibular retrognathia cases. While the treatment group (T) comprised 30 patients treated using a functional appliance for one year during puberty, the control group (C) consisted of 15 patients who did not receive any orthodontic treatment due to insufficient oral hygiene. FD and CorT analyses were bilaterally evaluated for each mandible. FD measurements were performed on the condylar process, the antegonial notch, and ramus regions on panoramic radiographs. A paired t-test was applied for group analysis, before (T1) and after treatment (T2) and, correspondingly, before (C1) and after (C2) controls. In addition, an independent t-test was used to determine differences between the treatment (∆T = T2−T1) and the control group (∆C = C2−C1). Results Statistically significant differences were found in the treatment group between the initial and post-treatment FD values of the right (p < 0.05) and left condyles (p < 0.05), and the CorT measurements on the right (p < 0.01) and the left sides (p < 0.05). There was no statistically significant difference in FD parameters in the control group and a significant difference was only found in the left CorT (p < 0.05). A comparison of the treatment and control groups revealed that the changes in FD and CorT measurements were not statistically significantly different between the groups (p > 0.05). Conclusion: Mandibular protraction appliances do not produce trabecular bone alteration in the mandibular condyles, the antegonial notch and ramus over a 12-month time period.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44008566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Ozkan, Gulay Dumanli Gok, N. E. Ordueri, T. Elgun
Abstract Backround: The in vitro cytotoxic effects of six different clear aligner materials were evaluated using the MTT analysis. Methods: The clear aligner material samples [Duran (ScheuDental GmbH, Iserlohn, Germany), Zendura-Flx (Bay Materials LLC, Fremont, CA, USA), Taglus (Laxmi Dental Export Pvt. Ltd, Mumbai, India), Smart Track (Align Technology, San Jose, CA, USA), Zendura (Bay Materials LLC, Fremont, CA, USA), Essix C + (Essix® (Raintree Essix, Inc., 4001 Division St, Metairie, LA-USA)] were initially kept in a saline solution in airtight test tubes for 8 weeks at 37°C. According to the recommended ISO standards, the weights of the samples were divided by the volumes of the dilutions in the ratio of 0.1 g/ml. To evaluate the cytotoxicity of the samples, an MTT analysis was performed using a human gingival fibroblast cell line (HGF). To analyse the data, the Kruskal– Wallis test was applied (a=0.05). Results: Zendura was the most cytotoxic material resulting in 67.3 ± 16.20% cell viability, followed by Smart Track with 87.6 ± 5.53% cell viability. While Duran, Essix C + had 92.6 ± 26.34% and 94.9 ± 8.54% cell viability, Zendura-Flx, Taglus had 106.9 ± 12.76% and 113.183 ± 7.45% cell viability, respectively. Conclusion: While Zendura and Smart Track showed mild cytotoxicity, other materials showed greater cell viabilities. According to the ISO standards, the clinical use of each brand of aligners, except Zendura, may be considered reliable. Taking into account standard deviation, Zendura and Duran should be used with caution. The suppliers of aligners should adhere to the manufacturer’s recommendations since an increase in ion release might arise from material wear.
摘要背景:采用MTT分析评估了六种不同的透明对准剂材料的体外细胞毒作用。方法:透明对准器材料样品[Duran (ScheuDental GmbH, Iserlohn，德国)，Zendura- flx (Bay Materials LLC, Fremont, CA, USA)， Taglus (Laxmi Dental Export pltd, Mumbai, India)， Smart Track (Align Technology, San Jose, CA, USA)， Zendura (Bay Materials LLC, Fremont, CA, USA)， Essix C + (Essix®(Raintree Essix, Inc.， 4001 Division St, Metairie, LA-USA)]最初在37°C的密封试管中在盐水溶液中保存8周。按照推荐的ISO标准，将样品的重量除以稀释液的体积，比例为0.1 g/ml。为了评估样品的细胞毒性，使用人牙龈成纤维细胞系(HGF)进行MTT分析。数据分析采用Kruskal - Wallis检验(a=0.05)。结果:Zendura的细胞毒性最强，细胞存活率为67.3±16.20%，Smart Track次之，细胞存活率为87.6±5.53%。Duran、Essix C +的细胞存活率分别为92.6±26.34%和94.9±8.54%，Zendura-Flx、Taglus的细胞存活率分别为106.9±12.76%和113.183±7.45%。结论:Zendura和Smart Track表现出轻微的细胞毒性，而其他材料表现出较大的细胞活力。根据ISO标准，除Zendura外，每个品牌的牙齿矫正器的临床使用可能被认为是可靠的。考虑到标准偏差，Zendura和Duran应谨慎使用。矫正器的供应商应遵守制造商的建议，因为材料磨损可能导致离子释放增加。
{"title":"Cytotoxicity evaluation of different clear aligner materials using MTT analysis","authors":"E. Ozkan, Gulay Dumanli Gok, N. E. Ordueri, T. Elgun","doi":"10.2478/aoj-2022-0034","DOIUrl":"https://doi.org/10.2478/aoj-2022-0034","url":null,"abstract":"Abstract Backround: The in vitro cytotoxic effects of six different clear aligner materials were evaluated using the MTT analysis. Methods: The clear aligner material samples [Duran (ScheuDental GmbH, Iserlohn, Germany), Zendura-Flx (Bay Materials LLC, Fremont, CA, USA), Taglus (Laxmi Dental Export Pvt. Ltd, Mumbai, India), Smart Track (Align Technology, San Jose, CA, USA), Zendura (Bay Materials LLC, Fremont, CA, USA), Essix C + (Essix® (Raintree Essix, Inc., 4001 Division St, Metairie, LA-USA)] were initially kept in a saline solution in airtight test tubes for 8 weeks at 37°C. According to the recommended ISO standards, the weights of the samples were divided by the volumes of the dilutions in the ratio of 0.1 g/ml. To evaluate the cytotoxicity of the samples, an MTT analysis was performed using a human gingival fibroblast cell line (HGF). To analyse the data, the Kruskal– Wallis test was applied (a=0.05). Results: Zendura was the most cytotoxic material resulting in 67.3 ± 16.20% cell viability, followed by Smart Track with 87.6 ± 5.53% cell viability. While Duran, Essix C + had 92.6 ± 26.34% and 94.9 ± 8.54% cell viability, Zendura-Flx, Taglus had 106.9 ± 12.76% and 113.183 ± 7.45% cell viability, respectively. Conclusion: While Zendura and Smart Track showed mild cytotoxicity, other materials showed greater cell viabilities. According to the ISO standards, the clinical use of each brand of aligners, except Zendura, may be considered reliable. Taking into account standard deviation, Zendura and Duran should be used with caution. The suppliers of aligners should adhere to the manufacturer’s recommendations since an increase in ion release might arise from material wear.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47330828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Buyuk, H. Simsek, Sedanur Hatal, Nilge Sarımehmetoglu, Didem Odabasi
Abstract Objectives The objective of the present study was to compare the dentoskeletal effects of mini-screw-assisted rapid maxillary expansion (RME) in children with different body mass index (BMI) percentiles. Study design The study was performed on 20 patients who were divided into two groups based on their BMI percentiles as normal-weight (n = 10) and overweight-obese (n = 10). The linear, angular and area analyses were performed on lateral and postero-anterior cephalometric radiographs and three-dimensional dental models before and after RME therapy. Results A statistically significant increase was observed in maxillary intermolar and intercanine distances and palatal area measurements in both groups (P < 0.05). There was no significant difference between the two groups when dental RME changes were measured on 3D models. A significant difference was observed in latero-nasal and maxillo-mandibular width as well as postero-anterior cephalometric parameters between the groups (P < 0.05). While a significant change was observed in the SN-GoMe, FMA, Z angle, Wits appraisal, total anterior facial height and lower anterior facial height parameters in the normal-weight group (P < 0.05), a statistically significant change was observed in the gonial and nasolabial angles in the overweight-obese group. Conclusions Mini-screw-assisted RME treatment significantly increased maxillary intermolar and intercanine width, and the palatal area in both groups; however, there was no significant difference between the BMI groups.
{"title":"Comparison of mini-screw-assisted rapid maxillary expansion in adolescents with different body mass indices: a prospective clinical study","authors":"S. Buyuk, H. Simsek, Sedanur Hatal, Nilge Sarımehmetoglu, Didem Odabasi","doi":"10.21307/aoj-2022.005","DOIUrl":"https://doi.org/10.21307/aoj-2022.005","url":null,"abstract":"Abstract Objectives The objective of the present study was to compare the dentoskeletal effects of mini-screw-assisted rapid maxillary expansion (RME) in children with different body mass index (BMI) percentiles. Study design The study was performed on 20 patients who were divided into two groups based on their BMI percentiles as normal-weight (n = 10) and overweight-obese (n = 10). The linear, angular and area analyses were performed on lateral and postero-anterior cephalometric radiographs and three-dimensional dental models before and after RME therapy. Results A statistically significant increase was observed in maxillary intermolar and intercanine distances and palatal area measurements in both groups (P < 0.05). There was no significant difference between the two groups when dental RME changes were measured on 3D models. A significant difference was observed in latero-nasal and maxillo-mandibular width as well as postero-anterior cephalometric parameters between the groups (P < 0.05). While a significant change was observed in the SN-GoMe, FMA, Z angle, Wits appraisal, total anterior facial height and lower anterior facial height parameters in the normal-weight group (P < 0.05), a statistically significant change was observed in the gonial and nasolabial angles in the overweight-obese group. Conclusions Mini-screw-assisted RME treatment significantly increased maxillary intermolar and intercanine width, and the palatal area in both groups; however, there was no significant difference between the BMI groups.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43010393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The ectopic eruption path of a permanent molar can cause incomplete emergence through interference by an adjacent tooth, early loss of a primary molar, or an arch length discrepancy. It is clinically important to determine the appropriate appliance that may easily be placed for the considered application of a molar corrective force. A newly designed appliance is introduced for the distal uprighting of an ectopically erupting molar and supported by two case presentations. The current technique of using a segmental wire incorporating double-sided hooks may easily and effectively resolve this problem.
{"title":"Molar uprighting using a newly designed segmental wire: a case report","authors":"S. Bae, Ho-Jin Kim","doi":"10.2478/aoj-2022-0027","DOIUrl":"https://doi.org/10.2478/aoj-2022-0027","url":null,"abstract":"Abstract The ectopic eruption path of a permanent molar can cause incomplete emergence through interference by an adjacent tooth, early loss of a primary molar, or an arch length discrepancy. It is clinically important to determine the appropriate appliance that may easily be placed for the considered application of a molar corrective force. A newly designed appliance is introduced for the distal uprighting of an ectopically erupting molar and supported by two case presentations. The current technique of using a segmental wire incorporating double-sided hooks may easily and effectively resolve this problem.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41872360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Background A surgery-first approach has many advantages related to a shortened treatment time and an immediate facial aesthetic improvement compared to a three-stage conventional orthognathic surgery protocol. Objective The aim of this case report was to describe the treatment of a 21-year-old, female, patient who presented with a skeletal Class III malocclusion, maxillary retrusion, a negative overjet, an anterior and bilateral posterior cross-bite, and a vertical facial pattern highlighted by a high mandibular plane angle. Methods Orthodontic treatment was performed using self-ligating lingual appliances and a surgery-first approach. The active treatment time was 16 months. Results and conclusion Successful treatment results were achieved using a combination of an orthognathic surgery-first approach and lingual appliances in a patient with high aesthetic expectations.
{"title":"Orthognathic surgery-first approach with lingual appliances: a case report","authors":"H. Pamukçu, S. Özsoy, H. Tüz, Ömür POLAT-ÖZSOY","doi":"10.21307/aoj-2022.001","DOIUrl":"https://doi.org/10.21307/aoj-2022.001","url":null,"abstract":"Abstract Background A surgery-first approach has many advantages related to a shortened treatment time and an immediate facial aesthetic improvement compared to a three-stage conventional orthognathic surgery protocol. Objective The aim of this case report was to describe the treatment of a 21-year-old, female, patient who presented with a skeletal Class III malocclusion, maxillary retrusion, a negative overjet, an anterior and bilateral posterior cross-bite, and a vertical facial pattern highlighted by a high mandibular plane angle. Methods Orthodontic treatment was performed using self-ligating lingual appliances and a surgery-first approach. The active treatment time was 16 months. Results and conclusion Successful treatment results were achieved using a combination of an orthognathic surgery-first approach and lingual appliances in a patient with high aesthetic expectations.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47853046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Post-extraction alveolar ridge resorption is a common sequela when missing mandibular molar spaces are not managed in a timely fashion. The situation becomes more complicated in patients who seek orthodontic treatment if closure of the edentulous space is the major objective in order to avoid prosthetic rehabilitation. In the present article, two cases are reported, in which different bone augmentation graft materials were used and treatment duration and post-orthodontic alveolar ridge characteristics were compared. A regional acceleratory phenomenon after the grafting procedure facilitated uneventful orthodontic space closure. The status of the investing alveolar bone was compared using post-treatment cone-beam computed tomography. Both autogenous bone graft and allograft ridge augmentation procedures aided in successful molar protraction through the resorbed mandibular alveolar ridge, as well as preventing periodontal attachment loss.
{"title":"Edentulous ridge space closure after bone augmentation using different graft materials: A report of two cases","authors":"Shi Lin, T. C. Sun, Chia-Hsuan Chou, Li-Fang Hsu","doi":"10.21307/aoj-2022.002","DOIUrl":"https://doi.org/10.21307/aoj-2022.002","url":null,"abstract":"Abstract Post-extraction alveolar ridge resorption is a common sequela when missing mandibular molar spaces are not managed in a timely fashion. The situation becomes more complicated in patients who seek orthodontic treatment if closure of the edentulous space is the major objective in order to avoid prosthetic rehabilitation. In the present article, two cases are reported, in which different bone augmentation graft materials were used and treatment duration and post-orthodontic alveolar ridge characteristics were compared. A regional acceleratory phenomenon after the grafting procedure facilitated uneventful orthodontic space closure. The status of the investing alveolar bone was compared using post-treatment cone-beam computed tomography. Both autogenous bone graft and allograft ridge augmentation procedures aided in successful molar protraction through the resorbed mandibular alveolar ridge, as well as preventing periodontal attachment loss.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47574402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Youngjoo Lee, Jae Hyun Park, Na-Young Chang, Kang-gyu Lee, J. Chae
Abstract A 23-year-old female patient with moderate crowding and a bilateral molar scissor-bite was successfully treated without tooth extraction. Extra-alveolar skeletal anchorage, involving a three-dimensional key plate in the maxilla and two miniscrews in the buccal shelf of the mandible, were used for distalisation, buccolingual uprighting, and the intrusion of molars by fixed orthodontic appliances. Cone-beam computed tomography was used to identify available posterior space for the distalisation and buccolingual correction of the molars in scissor-bite. The total treatment time was 24 months. Post-treatment results showed good occlusal relationships and smile aesthetics. Twelve-month post-treatment records demonstrated no significant relapse and a favourable facial balance.
{"title":"Non-extraction camouflage treatment using extra-alveolar skeletal anchorage","authors":"Youngjoo Lee, Jae Hyun Park, Na-Young Chang, Kang-gyu Lee, J. Chae","doi":"10.21307/aoj-2022.007","DOIUrl":"https://doi.org/10.21307/aoj-2022.007","url":null,"abstract":"Abstract A 23-year-old female patient with moderate crowding and a bilateral molar scissor-bite was successfully treated without tooth extraction. Extra-alveolar skeletal anchorage, involving a three-dimensional key plate in the maxilla and two miniscrews in the buccal shelf of the mandible, were used for distalisation, buccolingual uprighting, and the intrusion of molars by fixed orthodontic appliances. Cone-beam computed tomography was used to identify available posterior space for the distalisation and buccolingual correction of the molars in scissor-bite. The total treatment time was 24 months. Post-treatment results showed good occlusal relationships and smile aesthetics. Twelve-month post-treatment records demonstrated no significant relapse and a favourable facial balance.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45874042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Objective: The aim of this in vitro study was to evaluate the effect of thermal aging and five different discolouring solutions on the shear bond strength (SBS), discoloration, and slot surface roughness (SSR) of Flash-Free ceramic brackets. Methods: A total of 70 human premolar teeth were randomly divided into seven groups: group 1: no procedure was performed; group 2: Only thermal cycling (TC); group 3: TC + immersion in cherry juice for 72 hr; group 4: TC + immersion in coffee for 72 hr; Group 5: TC + immersion in Coke for 72 hr; group 6: TC + immersion in artificial gastric acid for 24 hr; group 7: TC + immersion in artificial saliva for 72 hr. SBS values were determined by using a universal testing machine. The discolouration was evaluated using a Vita Easy Shade spectrophotometer which is based on the International Commission on Illumination system (CIE Lab colour system). A 3D optical profilometer was used to measure the roughness of the bracket slot bases. Results: Coke, coffee, cherry juice, and gastric acid all significantly increased slot surface roughness. There was, however, no statistically significant difference in the roughness caused by these liquids. The lowest SBS value was observed in the gastric acid group. Gastric acid and Coke were observed to induce the largest colour change. Conclusions: Thermal aging and different liquids cause discolouration and increased surface roughness on APC flash-free brackets. The adhesive bond strength was clinically acceptable even after immersion in gastric acid.
{"title":"Effect of different liquids on APC flash-free ceramic bracket’s color stability, shear bond strength, and slot surface roughness","authors":"Şeyda Canbaz Çevik, Hasan Camcı, K. Aslantaş","doi":"10.2478/aoj-2022-0016","DOIUrl":"https://doi.org/10.2478/aoj-2022-0016","url":null,"abstract":"Abstract Objective: The aim of this in vitro study was to evaluate the effect of thermal aging and five different discolouring solutions on the shear bond strength (SBS), discoloration, and slot surface roughness (SSR) of Flash-Free ceramic brackets. Methods: A total of 70 human premolar teeth were randomly divided into seven groups: group 1: no procedure was performed; group 2: Only thermal cycling (TC); group 3: TC + immersion in cherry juice for 72 hr; group 4: TC + immersion in coffee for 72 hr; Group 5: TC + immersion in Coke for 72 hr; group 6: TC + immersion in artificial gastric acid for 24 hr; group 7: TC + immersion in artificial saliva for 72 hr. SBS values were determined by using a universal testing machine. The discolouration was evaluated using a Vita Easy Shade spectrophotometer which is based on the International Commission on Illumination system (CIE Lab colour system). A 3D optical profilometer was used to measure the roughness of the bracket slot bases. Results: Coke, coffee, cherry juice, and gastric acid all significantly increased slot surface roughness. There was, however, no statistically significant difference in the roughness caused by these liquids. The lowest SBS value was observed in the gastric acid group. Gastric acid and Coke were observed to induce the largest colour change. Conclusions: Thermal aging and different liquids cause discolouration and increased surface roughness on APC flash-free brackets. The adhesive bond strength was clinically acceptable even after immersion in gastric acid.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44165085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lin Xu, Hanshi Li, L. Mei, Yuan Li, Pokam Wo, Y. Li
Abstract Objectives To investigate patient experience of aligner treatment and associated influencing factors. Methods A total of 102 patients wearing Invisalign clear aligners (Align Technology, California, USA) were recruited in an initial treatment group (N = 62) and a refinement group (N = 40). Clinical diagnoses and treatment designs were collected. Data from a Visual Analogue Scale (VAS), a Self-Rating Anxiety Scale (SAS), and an Oral Health Impact Profile-14 (OHIP-14) were recorded at the commencement (Day 0, before wearing the first set of aligners) and during the first 7 days (Days 1–7) after wearing the first set of aligners. Results The patient experience of aligner treatment (i.e., pain, anxiety and quality of life) was poorest during the first two days (P < 0.05), and returned to a normal level within a week. The level of patient experience during the initial phase was greater than that during the later refinement phase (P < 0.01). During the initial treatment, the studied factors did not significantly influence the level of pain (VAS) (P > 0.05 for all) nor anxiety (SAS) (P > 0.10 for all); the number of teeth with optimised attachments significantly (R = 0.28, P = 0.03) influenced the quality of life (OHIP-14). During the refinement phase, the studied factors did not significantly influence the level of pain (VAS) (P > 0.09 for all); the number of aligner sets significantly influenced the level of anxiety (SAS) (R = 0.41, P < 0.01); the Index of Treatment Complexity Outcome and Need (ICON) (R = 0.44, P < 0.01) and whether elastics were required significantly influenced the quality of life (OHIP-14) (R = 0.349, P = 0.03). Conclusions Patient experience of aligner treatment was poorest during the first two days and improved over a week. Patient experience during the initial phase was generally worse than that during refinement. Four clinical factors were found to have an influence, including the number of teeth with optimised attachments, the number of aligner sets, the ICON, and the need for elastics.
【摘要】目的了解患者对矫正器治疗的体验及相关影响因素。方法采用美国加州Align Technology公司的Invisalign牙齿矫正器，将102例患者分为初始治疗组(62例)和改良组(40例)。收集临床诊断和治疗方案。在开始(第0天，佩戴第一套矫正器前)和佩戴第一套矫正器后的前7天(第1-7天)记录视觉模拟量表(VAS)、焦虑自评量表(SAS)和口腔健康影响量表-14 (o髋关节-14)的数据。结果患者在矫正器治疗前2天疼痛、焦虑和生活质量最差(P < 0.05)， 1周内恢复正常。初始阶段患者经验水平高于后期细化阶段(P < 0.01)。在初始治疗期间，所研究的因素对疼痛(VAS)水平(均P > 0.05)和焦虑(SAS)水平(均P > 0.10)均无显著影响;优化附着体牙数对生活质量有显著影响(R = 0.28, P = 0.03)。在细化阶段，研究因素对疼痛(VAS)水平无显著影响(P < 0.05);矫正器组数显著影响焦虑水平(SAS) (R = 0.41, P < 0.01);治疗复杂性、结局和需要指数(ICON) (R = 0.44, P < 0.01)和是否需要弹性治疗对生活质量有显著影响(OHIP-14) (R = 0.349, P = 0.03)。结论患者对矫正器治疗的体验在前两天最差，一周后有所改善。患者在初始阶段的体验通常比细化阶段差。发现有四个临床因素有影响，包括优化附着物的牙齿数量，校准器组的数量，ICON和对弹性的需求。
{"title":"Aligner treatment: patient experience and influencing factors","authors":"Lin Xu, Hanshi Li, L. Mei, Yuan Li, Pokam Wo, Y. Li","doi":"10.21307/aoj-2022.008","DOIUrl":"https://doi.org/10.21307/aoj-2022.008","url":null,"abstract":"Abstract Objectives To investigate patient experience of aligner treatment and associated influencing factors. Methods A total of 102 patients wearing Invisalign clear aligners (Align Technology, California, USA) were recruited in an initial treatment group (N = 62) and a refinement group (N = 40). Clinical diagnoses and treatment designs were collected. Data from a Visual Analogue Scale (VAS), a Self-Rating Anxiety Scale (SAS), and an Oral Health Impact Profile-14 (OHIP-14) were recorded at the commencement (Day 0, before wearing the first set of aligners) and during the first 7 days (Days 1–7) after wearing the first set of aligners. Results The patient experience of aligner treatment (i.e., pain, anxiety and quality of life) was poorest during the first two days (P < 0.05), and returned to a normal level within a week. The level of patient experience during the initial phase was greater than that during the later refinement phase (P < 0.01). During the initial treatment, the studied factors did not significantly influence the level of pain (VAS) (P > 0.05 for all) nor anxiety (SAS) (P > 0.10 for all); the number of teeth with optimised attachments significantly (R = 0.28, P = 0.03) influenced the quality of life (OHIP-14). During the refinement phase, the studied factors did not significantly influence the level of pain (VAS) (P > 0.09 for all); the number of aligner sets significantly influenced the level of anxiety (SAS) (R = 0.41, P < 0.01); the Index of Treatment Complexity Outcome and Need (ICON) (R = 0.44, P < 0.01) and whether elastics were required significantly influenced the quality of life (OHIP-14) (R = 0.349, P = 0.03). Conclusions Patient experience of aligner treatment was poorest during the first two days and improved over a week. Patient experience during the initial phase was generally worse than that during refinement. Four clinical factors were found to have an influence, including the number of teeth with optimised attachments, the number of aligner sets, the ICON, and the need for elastics.","PeriodicalId":48559,"journal":{"name":"Australasian Orthodontic Journal","volume":null,"pages":null},"PeriodicalIF":0.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45814672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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