Pub Date : 2021-04-03DOI: 10.1080/13440241.2021.1924349
Ehsan Talebi, Jan Michael Silvosa-Antes, Mohamed Alfatih Mohamed Alsadig, Hsin-Ming Chen, Gary A. Estomaguio
ABSTRACT Purpose: To compare the change of IL-1β and TNF-α expression during orthodontic tooth movement in rats, which were under regular diet and ketogenic diet (KD). Materials and Methods: The maxillary right first molars of 3-month-old male Sprague-Dawley rats were subjected to mesial movement by 50 g of force for 14 days under ketogenic diet. A control group was also established in which rats were subjected to the same tooth movement conditions but under a regular diet. The distance of tooth movement was measured by using precision electronic calipers. After 14 days, the rats were sacrificed and the mesial surface of the palatal root of the right first molar was analysed to determine the expression levels of IL-1β and TNF-α through immunohistochemical staining. The images obtained were then quantified using ImageJ program. Results: After 14 days of orthodontic tooth movement, the amount of tooth movement in the ketogenic group was lesser by approximately half the distance compared to that of the control group. Moreover, the expression of IL-1β and TNF-α was also lower. Conclusions: Consuming ketogenic diet reduces the expected amount of tooth movement which was evidently shown by a significant lower cytokine expression of IL-1β and TNF-α than the group under regular diet. This suggests that ketogenic diet is a contributing factor in delaying the tooth movement during orthodontic treatment.
{"title":"Inhibitory effect of short-term ketogenic diet on cytokine expression during orthodontic movement in a rat model","authors":"Ehsan Talebi, Jan Michael Silvosa-Antes, Mohamed Alfatih Mohamed Alsadig, Hsin-Ming Chen, Gary A. Estomaguio","doi":"10.1080/13440241.2021.1924349","DOIUrl":"https://doi.org/10.1080/13440241.2021.1924349","url":null,"abstract":"ABSTRACT Purpose: To compare the change of IL-1β and TNF-α expression during orthodontic tooth movement in rats, which were under regular diet and ketogenic diet (KD). Materials and Methods: The maxillary right first molars of 3-month-old male Sprague-Dawley rats were subjected to mesial movement by 50 g of force for 14 days under ketogenic diet. A control group was also established in which rats were subjected to the same tooth movement conditions but under a regular diet. The distance of tooth movement was measured by using precision electronic calipers. After 14 days, the rats were sacrificed and the mesial surface of the palatal root of the right first molar was analysed to determine the expression levels of IL-1β and TNF-α through immunohistochemical staining. The images obtained were then quantified using ImageJ program. Results: After 14 days of orthodontic tooth movement, the amount of tooth movement in the ketogenic group was lesser by approximately half the distance compared to that of the control group. Moreover, the expression of IL-1β and TNF-α was also lower. Conclusions: Consuming ketogenic diet reduces the expected amount of tooth movement which was evidently shown by a significant lower cytokine expression of IL-1β and TNF-α than the group under regular diet. This suggests that ketogenic diet is a contributing factor in delaying the tooth movement during orthodontic treatment.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"71 - 79"},"PeriodicalIF":0.4,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1924349","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47315581","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 : 2021-04-01DOI: 10.1080/13440241.2021.1908749
M. Macedo, G. C. Venezian, José Guilherme Neves, Vívian Fernandes Furletti de Goés, M. Vedovello-Filho, L. Correr-Sobrinho, Ana Rosa Costa
ABSTRACT Purpose: To assess the influence of 0.12% chlorhexidine solution (CHX) in the strength degradation of different intermaxillary latex and non-latex elastics. Materials and methods: Eighty ¼ inch elastics were separated into eight groups (n = 10) according to manufacturers (Morelli™ and American Orthodontics™), elastic’s type (latex and non-latex) and storage solution (artificial saliva and CHX). Each sample was extended to 19.2 mm, corresponding to 3x the size of their inner diameter, and initial force was verified on the universal testing machine. The elastics were then kept extended, immersed in artificial saliva and their strength was once again evaluated in the following period of time: 12 and 24 hours. Following the storage period, elastics of CHX groups were immersed for 1 min into PerioGard (0.12% chlorhexidine solution) before the strength evaluation. The data (gf) was submitted to a three-way repeated measure analysis of variance and Tukey’s test (α = 0.05). Results: Significant differences between elastics and time were observed (p < 0.000). Statistically significant reduction in strength was found in non-latex and latex elastics between the initial condition and after 12 h and 24 h (p < 0.05). The non-latex elastics showed statistically higher degradation values than the latex elastics, in the three analysis times (p < 0.05). No statistical difference was found between saliva and CHX, regardless of the time and elastic type (p > 0.05). Conclusions: Generally, the latex elastics showed less strength degradation compared to non-latex elastics. CHX did not affect strength degradation and time influenced strength degradation in the first 12 hours, keeping practically constant for up to 24 hours.
{"title":"Evaluation of latex and non-latex intermaxillary elastics strength degradation when submitted to the use of chlorhexidine","authors":"M. Macedo, G. C. Venezian, José Guilherme Neves, Vívian Fernandes Furletti de Goés, M. Vedovello-Filho, L. Correr-Sobrinho, Ana Rosa Costa","doi":"10.1080/13440241.2021.1908749","DOIUrl":"https://doi.org/10.1080/13440241.2021.1908749","url":null,"abstract":"ABSTRACT Purpose: To assess the influence of 0.12% chlorhexidine solution (CHX) in the strength degradation of different intermaxillary latex and non-latex elastics. Materials and methods: Eighty ¼ inch elastics were separated into eight groups (n = 10) according to manufacturers (Morelli™ and American Orthodontics™), elastic’s type (latex and non-latex) and storage solution (artificial saliva and CHX). Each sample was extended to 19.2 mm, corresponding to 3x the size of their inner diameter, and initial force was verified on the universal testing machine. The elastics were then kept extended, immersed in artificial saliva and their strength was once again evaluated in the following period of time: 12 and 24 hours. Following the storage period, elastics of CHX groups were immersed for 1 min into PerioGard (0.12% chlorhexidine solution) before the strength evaluation. The data (gf) was submitted to a three-way repeated measure analysis of variance and Tukey’s test (α = 0.05). Results: Significant differences between elastics and time were observed (p < 0.000). Statistically significant reduction in strength was found in non-latex and latex elastics between the initial condition and after 12 h and 24 h (p < 0.05). The non-latex elastics showed statistically higher degradation values than the latex elastics, in the three analysis times (p < 0.05). No statistical difference was found between saliva and CHX, regardless of the time and elastic type (p > 0.05). Conclusions: Generally, the latex elastics showed less strength degradation compared to non-latex elastics. CHX did not affect strength degradation and time influenced strength degradation in the first 12 hours, keeping practically constant for up to 24 hours.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"65 - 70"},"PeriodicalIF":0.4,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1908749","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42839575","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 : 2021-01-02DOI: 10.1080/13440241.2021.1896415
K. Fujita, S. Minamiyama, Risa Usumi-Fujita, S. Omura, H. Takasu, Y. Yamashita, K. Honda, H. Imai, T. Iwai, M. Hirota, T. Ono, K. Mitsudo
ABSTRACT Purpose: The aim of this study was to evaluate the effect of two types of mandibular autorotation concept (MAC) surgery using maxillary impaction combined with a straight locking miniplate (SLM) technique on the condyles of patients with skeletal Class II open bite. Materials and methods: Fourteen female patients with skeletal Class II mandibular retrusion with open bite were included in this study. The patients were divided into two groups based on the type of MAC surgery performed: a group of subjects who underwent maxillary impaction only (MAC-1 group) and a group of subjects who underwent maxillary impaction combined with mandibular osteotomy (MAC-2 group). A 3D-printing CAD/CAM wafer was fabricated. The SLM technique was performed to stabilize the vertical maxillomandibular relationship during surgery. A computed tomographic image was obtained preoperatively as well as on the third post-surgical day and 1 year post-surgically to evaluate the relapse by assessing changes in cephalometric measurements, condylar volume, and condylar surface area. Results: Neither the MAC-1 group nor the MAC-2 group showed significant changes in their condylar surface area that could have led to skeletal relapse. The condylar volume was significantly decreased in the MAC-2 group, but the affected location did not contribute to the relapse of the mandibular position. Conclusion: Our findings suggest that MAC surgery with the SLM technique in patients with skeletal Class II retrognathia did not result in post-surgical relapse or further deformation and resorption of the condyle; rather, it yielded promising functional and morphological stability.
{"title":"Temporomandibular joint stability after two types of maxillary impaction surgery in patients with skeletal class II open bite due to condylar deformations: a preliminary study","authors":"K. Fujita, S. Minamiyama, Risa Usumi-Fujita, S. Omura, H. Takasu, Y. Yamashita, K. Honda, H. Imai, T. Iwai, M. Hirota, T. Ono, K. Mitsudo","doi":"10.1080/13440241.2021.1896415","DOIUrl":"https://doi.org/10.1080/13440241.2021.1896415","url":null,"abstract":"ABSTRACT Purpose: The aim of this study was to evaluate the effect of two types of mandibular autorotation concept (MAC) surgery using maxillary impaction combined with a straight locking miniplate (SLM) technique on the condyles of patients with skeletal Class II open bite. Materials and methods: Fourteen female patients with skeletal Class II mandibular retrusion with open bite were included in this study. The patients were divided into two groups based on the type of MAC surgery performed: a group of subjects who underwent maxillary impaction only (MAC-1 group) and a group of subjects who underwent maxillary impaction combined with mandibular osteotomy (MAC-2 group). A 3D-printing CAD/CAM wafer was fabricated. The SLM technique was performed to stabilize the vertical maxillomandibular relationship during surgery. A computed tomographic image was obtained preoperatively as well as on the third post-surgical day and 1 year post-surgically to evaluate the relapse by assessing changes in cephalometric measurements, condylar volume, and condylar surface area. Results: Neither the MAC-1 group nor the MAC-2 group showed significant changes in their condylar surface area that could have led to skeletal relapse. The condylar volume was significantly decreased in the MAC-2 group, but the affected location did not contribute to the relapse of the mandibular position. Conclusion: Our findings suggest that MAC surgery with the SLM technique in patients with skeletal Class II retrognathia did not result in post-surgical relapse or further deformation and resorption of the condyle; rather, it yielded promising functional and morphological stability.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"47 - 54"},"PeriodicalIF":0.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1896415","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43965661","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 : 2021-01-02DOI: 10.1080/13440241.2021.1891398
Mahmud Mohammed, Norma Ab Rahman, A. H. Samsudin
ABSTRACT Purpose. The study aimed to evaluate the artefacts from different types of fixed orthodontic auxiliary appliance. Methodology. This is an in-vitro cross-sectional study. Six different types of the fixed auxiliary appliance were placed consecutively into a cadaveric skull head in combination with orthodontic brackets. All scans were performed by a single operator using the same CT machine followed by a standard scanning protocol. Artefact intensity for all data sets was quantified by calculating the standard deviation (SD) of the grey values within the dataset by following a standard method. All the axial slices were divided into two anatomical zones according to the Frankfort horizontal (FH) plane. The zone-A covered the axial slices which were above the FH plane and zone B consist of axial slices which were below the FH plane One-way ANOVA Tamhane test was used for the data analysis. The level of significance (p) was set at 0.05. Result. The mean artefact score of CT images with the fixed orthodontic auxiliary appliances was significantly higher than the control images at zone B. In addition, there was no significant difference (p = 0.061) observed between the CT images with fixed orthodontic auxiliary appliances and control images within the zone A. Conclusion. Fixed orthodontic auxiliary appliances produced a significant amount of noise below the FH plane and removal of this appliance before a CT scan will improve the image quality significantly within the area.
{"title":"Artefact of fixed orthodontic auxiliary appliance in craniofacial CT image","authors":"Mahmud Mohammed, Norma Ab Rahman, A. H. Samsudin","doi":"10.1080/13440241.2021.1891398","DOIUrl":"https://doi.org/10.1080/13440241.2021.1891398","url":null,"abstract":"ABSTRACT Purpose. The study aimed to evaluate the artefacts from different types of fixed orthodontic auxiliary appliance. Methodology. This is an in-vitro cross-sectional study. Six different types of the fixed auxiliary appliance were placed consecutively into a cadaveric skull head in combination with orthodontic brackets. All scans were performed by a single operator using the same CT machine followed by a standard scanning protocol. Artefact intensity for all data sets was quantified by calculating the standard deviation (SD) of the grey values within the dataset by following a standard method. All the axial slices were divided into two anatomical zones according to the Frankfort horizontal (FH) plane. The zone-A covered the axial slices which were above the FH plane and zone B consist of axial slices which were below the FH plane One-way ANOVA Tamhane test was used for the data analysis. The level of significance (p) was set at 0.05. Result. The mean artefact score of CT images with the fixed orthodontic auxiliary appliances was significantly higher than the control images at zone B. In addition, there was no significant difference (p = 0.061) observed between the CT images with fixed orthodontic auxiliary appliances and control images within the zone A. Conclusion. Fixed orthodontic auxiliary appliances produced a significant amount of noise below the FH plane and removal of this appliance before a CT scan will improve the image quality significantly within the area.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"41 - 46"},"PeriodicalIF":0.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1891398","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45767678","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 : 2021-01-02DOI: 10.1080/13440241.2021.1891397
P. Santiwong, Pawan Kobkitsakul, A. Khantachawana, Rochaya Chintavalakorn
ABSTRACT Objectives. To investigate the welding parameters on preparation of nickel-titanium (NiTi) orthodontic arch wires that can simultaneously level and retract anterior teeth by combining round wire to provide high flexibility with rectangular wire to provide high rigidity. The effects of voltage and number of welding points on tensile strength, transition temperature range (TTR), and penetration of laser beam were investigated. Materials and Methods. 15 mm segments of 0.018 in. round wire and 15 mm of 0.019 × 0.025 in. rectangular wire were laser welded under argon shielding. The laser voltage was varied between 170 and 210 V for one-point and two-point welding. Results. Incomplete welding was found only in one-point welding at low voltage while all others were joined completely. Mean maximum tensile force at fracture was increased with increasing voltage. One-point welding at 210 V gave rise to the highest force at fracture. Differential scanning calorimetry (DSC) of the welded joints showed a lack of the original TTR curve, indicating the loss of superelastic properties. Significance. Laser welding of NiTi orthodontic arch wires with different geometries provided acceptable strength for use in orthodontic treatment.
{"title":"Effect of laser welding on mechanical properties of round-rectangular nickel-titanium (NiTi) orthodontic wires","authors":"P. Santiwong, Pawan Kobkitsakul, A. Khantachawana, Rochaya Chintavalakorn","doi":"10.1080/13440241.2021.1891397","DOIUrl":"https://doi.org/10.1080/13440241.2021.1891397","url":null,"abstract":"ABSTRACT Objectives. To investigate the welding parameters on preparation of nickel-titanium (NiTi) orthodontic arch wires that can simultaneously level and retract anterior teeth by combining round wire to provide high flexibility with rectangular wire to provide high rigidity. The effects of voltage and number of welding points on tensile strength, transition temperature range (TTR), and penetration of laser beam were investigated. Materials and Methods. 15 mm segments of 0.018 in. round wire and 15 mm of 0.019 × 0.025 in. rectangular wire were laser welded under argon shielding. The laser voltage was varied between 170 and 210 V for one-point and two-point welding. Results. Incomplete welding was found only in one-point welding at low voltage while all others were joined completely. Mean maximum tensile force at fracture was increased with increasing voltage. One-point welding at 210 V gave rise to the highest force at fracture. Differential scanning calorimetry (DSC) of the welded joints showed a lack of the original TTR curve, indicating the loss of superelastic properties. Significance. Laser welding of NiTi orthodontic arch wires with different geometries provided acceptable strength for use in orthodontic treatment.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"33 - 40"},"PeriodicalIF":0.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1891397","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47818551","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 : 2021-01-02DOI: 10.1080/13440241.2021.1888684
Thiri Hla-Myint, M. Tsuji, Shoichi Suzuki, N. Obayashi, T. Kurabayashi, K. Moriyama
ABSTRACT Purpose: To establish a novel method for qualitative and quantitative evaluation of deglutitive tongue movement by integration of ultrasound (US) video imaging and lateral cephalogram of mandibular prognathism subjects before and after orthognathic surgery. Materials and methods: The US video imaging and lateral cephalogram were obtained from ten mandibular prognathism subjects before and after orthognathic surgery and integrated with an acrylic positional occlusal plate (POP) as a marker for superimposition. The percentage of the anterior and posterior tongue dorsum height, with respect to the palatal height, was measured and compared at each stage (Stages 1–5) of the deglutitive tongue movement. Individual variation on 5-times repeated deglutitive tongue movement in the same subject was evaluated. Furthermore, the intra- and inter-examiner reliability was evaluated using Dahlberg’s formula and correlation coefficient. Results: The individual variation value was small enough, while the intra-examiner measurement errors were all < 0.20 and the inter-examiner correlation coefficient values were all > 0.80. The percentage of the posterior tongue dorsum height in the postoperative measurement was significantly larger than that measured preoperatively at all deglutitive stages, except Stage 4. In seven out of ten subjects, the tongue tip region protruded over the upper incisor edge before surgery could touch the lingual surface of the upper incisor postoperatively. Conclusion: The newly developed US-cephalogram integration method was useful for qualitative and quantitative evaluation of the deglutitive tongue movement in a clinical setting without additional radiation exposure.
{"title":"Establishment of a novel method for qualitative and quantitative evaluation of deglutitive tongue movement by integration of ultrasound video imaging and lateral cephalogram","authors":"Thiri Hla-Myint, M. Tsuji, Shoichi Suzuki, N. Obayashi, T. Kurabayashi, K. Moriyama","doi":"10.1080/13440241.2021.1888684","DOIUrl":"https://doi.org/10.1080/13440241.2021.1888684","url":null,"abstract":"ABSTRACT Purpose: To establish a novel method for qualitative and quantitative evaluation of deglutitive tongue movement by integration of ultrasound (US) video imaging and lateral cephalogram of mandibular prognathism subjects before and after orthognathic surgery. Materials and methods: The US video imaging and lateral cephalogram were obtained from ten mandibular prognathism subjects before and after orthognathic surgery and integrated with an acrylic positional occlusal plate (POP) as a marker for superimposition. The percentage of the anterior and posterior tongue dorsum height, with respect to the palatal height, was measured and compared at each stage (Stages 1–5) of the deglutitive tongue movement. Individual variation on 5-times repeated deglutitive tongue movement in the same subject was evaluated. Furthermore, the intra- and inter-examiner reliability was evaluated using Dahlberg’s formula and correlation coefficient. Results: The individual variation value was small enough, while the intra-examiner measurement errors were all < 0.20 and the inter-examiner correlation coefficient values were all > 0.80. The percentage of the posterior tongue dorsum height in the postoperative measurement was significantly larger than that measured preoperatively at all deglutitive stages, except Stage 4. In seven out of ten subjects, the tongue tip region protruded over the upper incisor edge before surgery could touch the lingual surface of the upper incisor postoperatively. Conclusion: The newly developed US-cephalogram integration method was useful for qualitative and quantitative evaluation of the deglutitive tongue movement in a clinical setting without additional radiation exposure.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"23 - 31"},"PeriodicalIF":0.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2021.1888684","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45641548","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 : 2021-01-02DOI: 10.1080/13440241.2020.1855941
Purva Verma, S. S. Dinesh
ABSTRACT Aim: Aim of this study was to assess transverse maxillary dimension in subjects with unilateral and bilateral canine impaction, compare with a similar control group and to establish correlation, if any. Materials and Methods: This study included 135 subjects who were split into three groups: (i) unilateral canine impaction group, (ii) bilateral canine impaction and (iii) control group each having 45 subjects. For each subject 4 maxillary transverse dimensions were evaluated on the following 4 levels: first molar basal width (MBW), first molar alveolar width (MAW) (Figure 2), first premolar basal width (PMBW), and first premolar alveolar width (PMAW) using CBCT. Results: MBW, MAW, PMBW and PMAW were significantly reduced in groups with bilateral and unilateral canine impaction (p-value<0.001). Conclusion: It can be concluded that subjects with bilateral and unilateral canine impactions have narrower maxillary transverse dimensions than those without impaction. Orthodontists must be aware and should consider the relationship between transverse maxillary width and canine impaction during pedantic treatment planning.
{"title":"Maxillary transverse dimensions in subjects with and without impacted canines in South Indian population: a comparative cone-beam computed tomography study","authors":"Purva Verma, S. S. Dinesh","doi":"10.1080/13440241.2020.1855941","DOIUrl":"https://doi.org/10.1080/13440241.2020.1855941","url":null,"abstract":"ABSTRACT Aim: Aim of this study was to assess transverse maxillary dimension in subjects with unilateral and bilateral canine impaction, compare with a similar control group and to establish correlation, if any. Materials and Methods: This study included 135 subjects who were split into three groups: (i) unilateral canine impaction group, (ii) bilateral canine impaction and (iii) control group each having 45 subjects. For each subject 4 maxillary transverse dimensions were evaluated on the following 4 levels: first molar basal width (MBW), first molar alveolar width (MAW) (Figure 2), first premolar basal width (PMBW), and first premolar alveolar width (PMAW) using CBCT. Results: MBW, MAW, PMBW and PMAW were significantly reduced in groups with bilateral and unilateral canine impaction (p-value<0.001). Conclusion: It can be concluded that subjects with bilateral and unilateral canine impactions have narrower maxillary transverse dimensions than those without impaction. Orthodontists must be aware and should consider the relationship between transverse maxillary width and canine impaction during pedantic treatment planning.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"9 - 16"},"PeriodicalIF":0.4,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1855941","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45969660","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 : 2020-12-29DOI: 10.1080/13440241.2020.1867812
H. Matoba, Aki Nishiura, Y. Honda, Shin‐ichi Fujiwara, N. Matsumoto
ABSTRACT Purpose: Smokers who receive orthodontic treatment occasionally require longer treatment periods. Nevertheless, it is unclear whether delayed tooth movement can be recovered by encouraging smoking cessation. The study was designed to examine whether tooth movement rates can be recovered by a period of smoking cessation in rats treated with a comprehensive mixture of tobacco smoke components (TSCs). Materials and methods: Nine-week-old Wistar male rats were divided into no treatment, sham, TSCs, and TSCs cessation groups. The rats in the no treatment and sham groups drank distilled water, whereas those in the TSCs group and the TSCs cessation groups received TSCs in their drinking water. A smoking cessation period of 10 days was set for rats in the TSCs cessation group before the three groups underwent tooth movement. Tooth movement distance was measured using micro-computed tomography, and osteoclast differentiation was evaluated histologically. Results: There was significantly greater tooth movement in the sham and TSCs cessation groups than in the TSCs group. However, the TSCs cessation group showed lesser osteoclast differentiation than the sham group. Conclusion: Our results indicate that delayed tooth movement caused by smoking was recovered by smoking cessation treatment; this recovery seems to be partially due to the increase in osteoclasts, although the number of osteoclasts was still less than that in the sham group.
{"title":"Smoking cessation rescues tooth movement delays caused by tobacco smoke components","authors":"H. Matoba, Aki Nishiura, Y. Honda, Shin‐ichi Fujiwara, N. Matsumoto","doi":"10.1080/13440241.2020.1867812","DOIUrl":"https://doi.org/10.1080/13440241.2020.1867812","url":null,"abstract":"ABSTRACT Purpose: Smokers who receive orthodontic treatment occasionally require longer treatment periods. Nevertheless, it is unclear whether delayed tooth movement can be recovered by encouraging smoking cessation. The study was designed to examine whether tooth movement rates can be recovered by a period of smoking cessation in rats treated with a comprehensive mixture of tobacco smoke components (TSCs). Materials and methods: Nine-week-old Wistar male rats were divided into no treatment, sham, TSCs, and TSCs cessation groups. The rats in the no treatment and sham groups drank distilled water, whereas those in the TSCs group and the TSCs cessation groups received TSCs in their drinking water. A smoking cessation period of 10 days was set for rats in the TSCs cessation group before the three groups underwent tooth movement. Tooth movement distance was measured using micro-computed tomography, and osteoclast differentiation was evaluated histologically. Results: There was significantly greater tooth movement in the sham and TSCs cessation groups than in the TSCs group. However, the TSCs cessation group showed lesser osteoclast differentiation than the sham group. Conclusion: Our results indicate that delayed tooth movement caused by smoking was recovered by smoking cessation treatment; this recovery seems to be partially due to the increase in osteoclasts, although the number of osteoclasts was still less than that in the sham group.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"17 - 22"},"PeriodicalIF":0.4,"publicationDate":"2020-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1867812","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43169424","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 : 2020-11-30DOI: 10.1080/13440241.2020.1853963
Yusuke Suzuki, N. Narita, Tomohiro Ishii, S. Negishi, K. Kasai
ABSTRACT Purpose: This study was conducted to clarify the effects of experimentally induced nasal obstruction (NO) on prefrontal activation and jaw movement activities, as well as feelings of discomfort and dyspnoea during chewing. Methods and materials: Eighteen healthy volunteers were enrolled as subjects. The levels of awareness of discomfort and sense of dyspnoea with nasal breathing (NB) and NO were determined using a visual analogue scale (VAS) following chewing and imagery tasks. Masticatory movements were analysed for masticatory path width, cycle duration, masticatory velocity, number of masticatory cycles, and duration of pre-swallowing phase during mastication in the subjects with establishment of NO and NB. An FNIRS device (Hb131S, astem Inc., Japan) was used to measure prefrontal cortex activities. Results: Discomfort and feelings of dyspnoea under the NO condition were significantly increased as compared with NB. Also, cycle duration with NO was significantly increased as well as the number of masticatory cycles, whereas those in the pre-swallowing phase were significantly decreased as compared to NB. Furthermore, prefrontal activities during chewing with NO were significantly decreased as compared to NB. Conclusion: These results indicate that nasal obstruction during chewing may induce a decline in prefrontal activities, accompanied with deterioration comfort and dyspnoea, and modulated jaw movement activities.
摘要目的:本研究旨在阐明实验性鼻塞(NO)对咀嚼时前额叶激活和下颌运动活动以及不适和呼吸困难感觉的影响。方法与材料:选取18名健康志愿者作为研究对象。在咀嚼和想象任务后，使用视觉模拟量表(VAS)测定鼻呼吸(NB)和NO的不适意识水平和呼吸困难感。通过NO和NB的建立，分析受试者在咀嚼过程中咀嚼路径宽度、周期持续时间、咀嚼速度、咀嚼循环次数和预吞期持续时间。FNIRS装置(Hb131S, system Inc.， Japan)用于测量前额皮质活动。结果:与NB相比，NO状态下患者的不适感和呼吸困难感明显增加。此外，与NB相比，NO组的周期持续时间和咀嚼周期数量显著增加，而吞咽前阶段的周期数量显著减少。此外，与NB相比，NO咀嚼时的前额叶活动显著降低。结论:咀嚼时鼻塞可能导致前额叶活动下降，伴有舒适度下降和呼吸困难，并调节下颌运动活动。
{"title":"Effects of nasal obstruction on prefrontal cortex activities during chewing","authors":"Yusuke Suzuki, N. Narita, Tomohiro Ishii, S. Negishi, K. Kasai","doi":"10.1080/13440241.2020.1853963","DOIUrl":"https://doi.org/10.1080/13440241.2020.1853963","url":null,"abstract":"ABSTRACT Purpose: This study was conducted to clarify the effects of experimentally induced nasal obstruction (NO) on prefrontal activation and jaw movement activities, as well as feelings of discomfort and dyspnoea during chewing. Methods and materials: Eighteen healthy volunteers were enrolled as subjects. The levels of awareness of discomfort and sense of dyspnoea with nasal breathing (NB) and NO were determined using a visual analogue scale (VAS) following chewing and imagery tasks. Masticatory movements were analysed for masticatory path width, cycle duration, masticatory velocity, number of masticatory cycles, and duration of pre-swallowing phase during mastication in the subjects with establishment of NO and NB. An FNIRS device (Hb131S, astem Inc., Japan) was used to measure prefrontal cortex activities. Results: Discomfort and feelings of dyspnoea under the NO condition were significantly increased as compared with NB. Also, cycle duration with NO was significantly increased as well as the number of masticatory cycles, whereas those in the pre-swallowing phase were significantly decreased as compared to NB. Furthermore, prefrontal activities during chewing with NO were significantly decreased as compared to NB. Conclusion: These results indicate that nasal obstruction during chewing may induce a decline in prefrontal activities, accompanied with deterioration comfort and dyspnoea, and modulated jaw movement activities.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"80 1","pages":"1 - 8"},"PeriodicalIF":0.4,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1853963","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49033300","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 : 2020-11-26DOI: 10.1080/13440241.2020.1843353
Supakorn Suntornchatchaweach, Kenji Hoshi, K. Okamura, K. Yoshiura, I. Takahashi
ABSTRACT Purpose: This study investigated the relationships among characteristics of maxillomandibular asymmetry in patients with menton deviation and temporomandibular joint (TMJ) disc conditions, including normal disc position (NDP), anterior disc displacement with reduction (ADDwR), rotational disc displacement with reduction (RDDwR), and anterior and/or rotational disc displacement without reduction (DDwoR). Materials and methods: Eighty-six patients with menton deviation (62 female patients and 24 male patients) were included. The TMJ magnetic resonance images were categorized into four groups: bilateral-NDP (n = 15), ADDwR (n = 13), RDDwR (n = 19) and DDwoR (n = 39). The characteristics of menton deviation and maxillomandibular asymmetry were determined using posteroanterior and lateral cephalograms. Differences in cephalometric variables among the groups were statistically analysed. Results: Patients with menton deviation under Skeletal Class I, and Skeletal Class II relationship showed a higher rate of DDwoR on lateral cephalograms. Significant differences were detected among groups on posteroanterior cephalograms with respect to the cant of the frontal mandibular plane and menton deviation. These two variables were significantly greater in the DDwoR group than in the bilateral-NDP group. Conclusion: The anteroposterior jaw relatioship and mandibular deviation may be associated with the severity of TMJ disc displacement.
{"title":"Relationship between menton deviation and temporomandibular disc displacement in adult patients","authors":"Supakorn Suntornchatchaweach, Kenji Hoshi, K. Okamura, K. Yoshiura, I. Takahashi","doi":"10.1080/13440241.2020.1843353","DOIUrl":"https://doi.org/10.1080/13440241.2020.1843353","url":null,"abstract":"ABSTRACT Purpose: This study investigated the relationships among characteristics of maxillomandibular asymmetry in patients with menton deviation and temporomandibular joint (TMJ) disc conditions, including normal disc position (NDP), anterior disc displacement with reduction (ADDwR), rotational disc displacement with reduction (RDDwR), and anterior and/or rotational disc displacement without reduction (DDwoR). Materials and methods: Eighty-six patients with menton deviation (62 female patients and 24 male patients) were included. The TMJ magnetic resonance images were categorized into four groups: bilateral-NDP (n = 15), ADDwR (n = 13), RDDwR (n = 19) and DDwoR (n = 39). The characteristics of menton deviation and maxillomandibular asymmetry were determined using posteroanterior and lateral cephalograms. Differences in cephalometric variables among the groups were statistically analysed. Results: Patients with menton deviation under Skeletal Class I, and Skeletal Class II relationship showed a higher rate of DDwoR on lateral cephalograms. Significant differences were detected among groups on posteroanterior cephalograms with respect to the cant of the frontal mandibular plane and menton deviation. These two variables were significantly greater in the DDwoR group than in the bilateral-NDP group. Conclusion: The anteroposterior jaw relatioship and mandibular deviation may be associated with the severity of TMJ disc displacement.","PeriodicalId":43169,"journal":{"name":"Orthodontic Waves","volume":"79 1","pages":"153 - 161"},"PeriodicalIF":0.4,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13440241.2020.1843353","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47865725","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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