{"title":"Relationship between movement of jaw and pharyngeal airway","authors":"","doi":"10.5927/jjjd.30.87","DOIUrl":"https://doi.org/10.5927/jjjd.30.87","url":null,"abstract":"","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128244281","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}
{"title":"Verification and future of functional correction by orthognathic treatment","authors":"","doi":"10.5927/jjjd.30.111","DOIUrl":"https://doi.org/10.5927/jjjd.30.111","url":null,"abstract":"","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129728929","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}
{"title":"シンポジウム3：上顎骨後方移動の現状","authors":"","doi":"10.5927/jjjd.33.103","DOIUrl":"https://doi.org/10.5927/jjjd.33.103","url":null,"abstract":"","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134211481","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}
Yoshimi Hanyuda, Yasutomo Araki, Masahiro Takahashi, T. Kikawada, K. Maki
Objective: Chronic nasal airway disorders in growing children are thought to adversely affect the normal development of the maxillofacial morphology. This study aimed to clarify the relationship between severe inferior turbinate hypertrophy, which is the cause of chronic nasal airway disorders, and maxillofacial morphology in children. Materials and Methods: The inferior turbinate hypertrophy group comprised 50 patients （30 boys, 20 girls, mean age 8.9±1.7 years） diagnosed with hypertrophic rhinitis at the Nose Clinic Tokyo and who had an enlarged inferior turbinate hypertrophy. The control group comprised 50 patients （18 boys, 32 girls, mean age 8.7±1.4 years） who visited Showa University Dental Hospital. Using cone-beam computed tomography, the maxillary bone width, upper anterior facial height, mandibular bone width, mandibular ramus height, length of the body of the mandible, maxillary dentition width, mandibular dentition width, anterior cranial base length, posterior cranial base length, cranial base angle, sella-nasion-point A angle, and sella-nasion-point B angle were measured. The differences between the groups were statistically analyzed using analysis of covariance. Results: Increased upper anterior facial height, shortened length of the body of the mandible and mandibular ramus height, and small cranial base angle were significantly associated with inferior turbinate hypertrophy. Conclusion: The study suggested that inferior turbinate hypertrophy caused by chronic rhinitis and allergic rhinitis could cause changes in the maxillofacial morphology. Promoting normal jaw development in childhood is crucial for preventing jaw deformities.
{"title":"Relationship between Inferior Turbinate Hypertrophy and Maxillofacial Morphology in Children","authors":"Yoshimi Hanyuda, Yasutomo Araki, Masahiro Takahashi, T. Kikawada, K. Maki","doi":"10.5927/jjjd.32.233","DOIUrl":"https://doi.org/10.5927/jjjd.32.233","url":null,"abstract":"Objective: Chronic nasal airway disorders in growing children are thought to adversely affect the normal development of the maxillofacial morphology. This study aimed to clarify the relationship between severe inferior turbinate hypertrophy, which is the cause of chronic nasal airway disorders, and maxillofacial morphology in children. Materials and Methods: The inferior turbinate hypertrophy group comprised 50 patients （30 boys, 20 girls, mean age 8.9±1.7 years） diagnosed with hypertrophic rhinitis at the Nose Clinic Tokyo and who had an enlarged inferior turbinate hypertrophy. The control group comprised 50 patients （18 boys, 32 girls, mean age 8.7±1.4 years） who visited Showa University Dental Hospital. Using cone-beam computed tomography, the maxillary bone width, upper anterior facial height, mandibular bone width, mandibular ramus height, length of the body of the mandible, maxillary dentition width, mandibular dentition width, anterior cranial base length, posterior cranial base length, cranial base angle, sella-nasion-point A angle, and sella-nasion-point B angle were measured. The differences between the groups were statistically analyzed using analysis of covariance. Results: Increased upper anterior facial height, shortened length of the body of the mandible and mandibular ramus height, and small cranial base angle were significantly associated with inferior turbinate hypertrophy. Conclusion: The study suggested that inferior turbinate hypertrophy caused by chronic rhinitis and allergic rhinitis could cause changes in the maxillofacial morphology. Promoting normal jaw development in childhood is crucial for preventing jaw deformities.","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132845795","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}
{"title":"示説抄録（2日目）","authors":"","doi":"10.5927/jjjd.29.202","DOIUrl":"https://doi.org/10.5927/jjjd.29.202","url":null,"abstract":"","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132312735","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}
Hiroaki Nakamura, H. Kanzaki, Yuko Yamada, Masumi Murakami, Erika Ozawa, Chihiro Kariya, Saaya Sahara, Satoshi Wada, T. Oikawa, Hiroshi Tomonari
Masticatory function is closely related to brain function, and normal occlusion is an essential factor for favorable brain function. Mandibular prognathism （MP） shows diminished occlusal function. Jaw deformity is presumed to adversely affect brain function due to decreased occlusal function. In this study, functional near-infrared spectroscopy （fNIRS） was used to examine brain blood flow to investigate the relationship between MP and brain function. Seventeen subjects with normal occlusion and 69 patients with MP participated in this study. The number of occlusal contacts was counted using silicone materials. Electromyography （EMG） of the masseter muscles during clenching was also recorded. Brain blood flow was measured with fNIRS during a calculation task and chewing tasks of preferential chewing of paraffin wax and hard gummy. For parametric data, Student’s t-test was used for statistical significance. The Mann-Whitney U test was used for the statistical significance of nonparametric data. The case of P＜0.05 was considered to show a statistically significant difference. As a result, the number of occlusal contacts in MP was smaller than that in normal occlusion. Masseter muscle activity during the clenching task was weaker in MP than normal occlusion. The calculation task increased oxy-Hb in both groups. There was no significant difference in oxy-Hb between groups in the calculation task. The task of preferential chewing of paraffin wax increased oxy-Hb in both groups. This increase was significant in the bilateral inferior frontal gyrus, and interestingly, the increase was lower in MP patients than in normal occlusion. The task of chewing hard gummy also induced an increase in oxy-Hb in the bilateral inferior frontal gyrus in both groups, though the increase was lower in MP patients than in normal occlusion. Correlation analysis revealed quite a weak correlation between the number of occlusal contacts and oxy-Hb, though EMG exhibited a stronger correlation to oxy-Hb than the number of occlusal contacts. In conclusion, compared with normal occlusion, MP patients had decreased brain blood flow during mastication in the bilateral inferior frontal gyrus, which is considered to be particularly involved in cognitive function in the prefrontal cortex. This suggests that MP may influence not only oral function but also systemic function such as brain blood flow.
{"title":"Chewing-induced Increase of Brain Blood Flow in Mandibular Prognathism Was Less Compared to Normal Occlusion","authors":"Hiroaki Nakamura, H. Kanzaki, Yuko Yamada, Masumi Murakami, Erika Ozawa, Chihiro Kariya, Saaya Sahara, Satoshi Wada, T. Oikawa, Hiroshi Tomonari","doi":"10.5927/jjjd.31.172","DOIUrl":"https://doi.org/10.5927/jjjd.31.172","url":null,"abstract":"Masticatory function is closely related to brain function, and normal occlusion is an essential factor for favorable brain function. Mandibular prognathism （MP） shows diminished occlusal function. Jaw deformity is presumed to adversely affect brain function due to decreased occlusal function. In this study, functional near-infrared spectroscopy （fNIRS） was used to examine brain blood flow to investigate the relationship between MP and brain function. Seventeen subjects with normal occlusion and 69 patients with MP participated in this study. The number of occlusal contacts was counted using silicone materials. Electromyography （EMG） of the masseter muscles during clenching was also recorded. Brain blood flow was measured with fNIRS during a calculation task and chewing tasks of preferential chewing of paraffin wax and hard gummy. For parametric data, Student’s t-test was used for statistical significance. The Mann-Whitney U test was used for the statistical significance of nonparametric data. The case of P＜0.05 was considered to show a statistically significant difference. As a result, the number of occlusal contacts in MP was smaller than that in normal occlusion. Masseter muscle activity during the clenching task was weaker in MP than normal occlusion. The calculation task increased oxy-Hb in both groups. There was no significant difference in oxy-Hb between groups in the calculation task. The task of preferential chewing of paraffin wax increased oxy-Hb in both groups. This increase was significant in the bilateral inferior frontal gyrus, and interestingly, the increase was lower in MP patients than in normal occlusion. The task of chewing hard gummy also induced an increase in oxy-Hb in the bilateral inferior frontal gyrus in both groups, though the increase was lower in MP patients than in normal occlusion. Correlation analysis revealed quite a weak correlation between the number of occlusal contacts and oxy-Hb, though EMG exhibited a stronger correlation to oxy-Hb than the number of occlusal contacts. In conclusion, compared with normal occlusion, MP patients had decreased brain blood flow during mastication in the bilateral inferior frontal gyrus, which is considered to be particularly involved in cognitive function in the prefrontal cortex. This suggests that MP may influence not only oral function but also systemic function such as brain blood flow.","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114632072","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}
{"title":"イブニングセミナー：3Dシミュレーションの適応と限界","authors":"","doi":"10.5927/jjjd.29.140","DOIUrl":"https://doi.org/10.5927/jjjd.29.140","url":null,"abstract":"","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114684985","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}
Yukako Isogai, A. Oka, Hidetaka Shimizu, M. Hamada, N. Uzawa, T. Yamashiro
In patients with severe mandibular prognathism, maxillary deficiency is commonly seen. We report the successful surgical orthodontic treatment of a patient with severe mandibular prognathism and narrow maxilla. A male aged 26 years and 8 months with a chief complaint of anterior crossbite was diagnosed with severe skeletal Class Ⅲ and Angle Class Ⅲ malocclusion with a narrow maxilla. We aligned the lower dental arch, followed by surgically assisted rapid palatal expansion （SARPE） for the maxilla using two distractors placed on premolars and molars to expand the posterior area more widely than the anterior area of the maxillary dental arch; as a result, the arch form of the maxilla was well corrected and coordinated with the mandible. Following maxillary advancement and impaction by Le Fort Ⅰ osteotomy and mandibular set-back, sagittal split ramus osteotomy （SSRO） improved the patient’s occlusion and facial profile. The resultant occlusion and satisfactory facial profile were maintained during the 2-year retention period.
{"title":"A Case of Mandibular Prognathism with Narrow Maxilla Treated by Surgically Assisted Rapid Palatal Expansion （SARPE） and Two-jaw Osteotomy","authors":"Yukako Isogai, A. Oka, Hidetaka Shimizu, M. Hamada, N. Uzawa, T. Yamashiro","doi":"10.5927/jjjd.29.253","DOIUrl":"https://doi.org/10.5927/jjjd.29.253","url":null,"abstract":"In patients with severe mandibular prognathism, maxillary deficiency is commonly seen. We report the successful surgical orthodontic treatment of a patient with severe mandibular prognathism and narrow maxilla. A male aged 26 years and 8 months with a chief complaint of anterior crossbite was diagnosed with severe skeletal Class Ⅲ and Angle Class Ⅲ malocclusion with a narrow maxilla. We aligned the lower dental arch, followed by surgically assisted rapid palatal expansion （SARPE） for the maxilla using two distractors placed on premolars and molars to expand the posterior area more widely than the anterior area of the maxillary dental arch; as a result, the arch form of the maxilla was well corrected and coordinated with the mandible. Following maxillary advancement and impaction by Le Fort Ⅰ osteotomy and mandibular set-back, sagittal split ramus osteotomy （SSRO） improved the patient’s occlusion and facial profile. The resultant occlusion and satisfactory facial profile were maintained during the 2-year retention period.","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114787501","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}
Akemi Kawajiri, Au Sasaki, T. Uesato, Yu Togane, Sachiko Asaka, K. Yamaguchi, N. Suda
The relationship between the shape of the cranial vault and the position of the mandibular fossa is not clear. To clarify the relationship, three-dimensional analysis was performed using cases with mandibular protrusion but without facial asymmetry. Nineteen female patients with skeletal mandibular protrusion who had visited Meikai University Hospital were used in this study. The lateral deviation of mental spine was less than 4 mm in all cases. Genetic/congenital anomaly cases, endocrine disorders, or cases with severe trauma and TMD were excluded. Computed tomography (CT) images of the 19 cases were taken at the first visit. Three reference planes were defined in CT images. The horizontal reference plane was defined as the plane running through the right and left porion, and left orbitale. The mid-sagittal reference plane was defined as the plane running through the midpoint of the bilateral nasomaxillary suture and basion, and perpendicular to the horizontal reference plane. The frontal reference plane was defined as the plane running through the left porion, and perpendicular to the horizontal reference and mid-sagittal reference planes. There was a significant negative correlation between the bilateral difference in the sagittal length of the cranial vaults and the bilateral difference in the sagittal position of the mandibular fossas. This implies that posteriorly located mandibular fossas are seen in cases with asymmetric cranial vaults having longer A-P length on the same sides. In contrast, there was no correlation between the bilateral difference in the vertical length of the cranial vaults and the bilateral difference in the vertical position of the mandibular fossas. Also, there was no correlation between the bilateral difference in the transverse length of the cranial vaults and the bilateral difference in the transverse position of the mandibular fossas. Interestingly, there was a significant negative correlation between the bilateral difference in the sagittal position of mandibular fossas and the bilateral difference of mandibular body lengths, suggesting that the mandibular body length compensated the A-P position of the mandibular fossa to prevent facial asymmetry. The obtained findings indicate that the shape of the cranial vaults is related to the A-P position of mandibular fossas in patients with skeletal mandibular protrusion but without facial asymmetry. It is likely that the bilateral difference of the mandibular body lengths has a compensating effect on the bilateral A-P difference of the mandibular fossas in the present cases. 明海大学歯学部形態機能成育学講座歯科矯正学分野(主任:須田直人教授) Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry (Chief : Prof. Naoto SUDA) 32 日顎変形誌 2019 年 川尻 朱美,他
{"title":"Three-dimensional Analysis of Cranial Vault and Position of Mandibular Fossa Part 1: Analysis of Mandibular Protrusion Cases without Asymmetry","authors":"Akemi Kawajiri, Au Sasaki, T. Uesato, Yu Togane, Sachiko Asaka, K. Yamaguchi, N. Suda","doi":"10.5927/JJJD.29.31","DOIUrl":"https://doi.org/10.5927/JJJD.29.31","url":null,"abstract":"The relationship between the shape of the cranial vault and the position of the mandibular fossa is not clear. To clarify the relationship, three-dimensional analysis was performed using cases with mandibular protrusion but without facial asymmetry. Nineteen female patients with skeletal mandibular protrusion who had visited Meikai University Hospital were used in this study. The lateral deviation of mental spine was less than 4 mm in all cases. Genetic/congenital anomaly cases, endocrine disorders, or cases with severe trauma and TMD were excluded. Computed tomography (CT) images of the 19 cases were taken at the first visit. Three reference planes were defined in CT images. The horizontal reference plane was defined as the plane running through the right and left porion, and left orbitale. The mid-sagittal reference plane was defined as the plane running through the midpoint of the bilateral nasomaxillary suture and basion, and perpendicular to the horizontal reference plane. The frontal reference plane was defined as the plane running through the left porion, and perpendicular to the horizontal reference and mid-sagittal reference planes. There was a significant negative correlation between the bilateral difference in the sagittal length of the cranial vaults and the bilateral difference in the sagittal position of the mandibular fossas. This implies that posteriorly located mandibular fossas are seen in cases with asymmetric cranial vaults having longer A-P length on the same sides. In contrast, there was no correlation between the bilateral difference in the vertical length of the cranial vaults and the bilateral difference in the vertical position of the mandibular fossas. Also, there was no correlation between the bilateral difference in the transverse length of the cranial vaults and the bilateral difference in the transverse position of the mandibular fossas. Interestingly, there was a significant negative correlation between the bilateral difference in the sagittal position of mandibular fossas and the bilateral difference of mandibular body lengths, suggesting that the mandibular body length compensated the A-P position of the mandibular fossa to prevent facial asymmetry. The obtained findings indicate that the shape of the cranial vaults is related to the A-P position of mandibular fossas in patients with skeletal mandibular protrusion but without facial asymmetry. It is likely that the bilateral difference of the mandibular body lengths has a compensating effect on the bilateral A-P difference of the mandibular fossas in the present cases. 明海大学歯学部形態機能成育学講座歯科矯正学分野(主任:須田直人教授) Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry (Chief : Prof. Naoto SUDA) 32 日顎変形誌 2019 年 川尻 朱美,他","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133848813","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}
Ryo Abe, K. Sakaue, T. Fukui, Naoya Fukamachi, Takafumi Hayashi, I. Saito
Purpose : There is little information available regarding swallowing tongue dynamics in cases that show remarkable discordance in the relationship between the upper and lower jaws. In this study, we measured the tongue motion during swallowing by ultrasonography in patients with mandibular prognathism and compared them with volunteers with normal occlusion. Methods : The subject group comprised 10 patients with mandibular prognathism (6 males, 4 females). Ten volunteers with normal occlusion (2 males, 8 females) served as controls. The subjects were instructed to swallow about 4 ml of tasteless jelly, and the tongue movement during swallowing was measured by ultrasonography. We measured the following times on the M-mode waveform in the center of the tongue, “Duration of grooving formation (T1)”, “Duration of grooving disappearance (T2)”, “Duration from grooving disappearance until tongue-palate contact (T3)”, “Duration of tongue-palate contact (T4)”, “Duration of return to rest (T5)” and “Total swallowing duration (T6)”. In the periphery of the tongue, we measured “Total swallowing duration (T7)” and qualitatively assessed the tongue waveform as well. Results : In the center of the tongue, T3, T5 and T6 were significantly longer in the subject group than in the control group. In the periphery of the tongue, T7 was also significantly longer in the subject group than in the control group. The tongue position of patients with mandibular prognathism tends to be low, so a longer time was necessary to lift the tongue to the palate and the anchoring effect of the contact between the tip of the tongue and the anterior palate became weak. Due to this, a longer swallowing time at the periphery of the tongue was possibly needed in the subject group. Further, the type of tongue movement seems to have been specialized because of frequent up-and-down movement of the tongue during swallowing. Conclusions : The present findings suggest that patients with mandibular prognathism, due to their morphological disharmony, need excessive time to lift the tongue surface to the palate, resulting in a longer swallowing time at the periphery of the tongue as well as a specialized tongue movement.
{"title":"An Investigation on Tongue Movement during Swallowing in Patients with Mandibular Prognathism Using Ultrasonography","authors":"Ryo Abe, K. Sakaue, T. Fukui, Naoya Fukamachi, Takafumi Hayashi, I. Saito","doi":"10.5927/jjjd.29.229","DOIUrl":"https://doi.org/10.5927/jjjd.29.229","url":null,"abstract":"Purpose : There is little information available regarding swallowing tongue dynamics in cases that show remarkable discordance in the relationship between the upper and lower jaws. In this study, we measured the tongue motion during swallowing by ultrasonography in patients with mandibular prognathism and compared them with volunteers with normal occlusion. Methods : The subject group comprised 10 patients with mandibular prognathism (6 males, 4 females). Ten volunteers with normal occlusion (2 males, 8 females) served as controls. The subjects were instructed to swallow about 4 ml of tasteless jelly, and the tongue movement during swallowing was measured by ultrasonography. We measured the following times on the M-mode waveform in the center of the tongue, “Duration of grooving formation (T1)”, “Duration of grooving disappearance (T2)”, “Duration from grooving disappearance until tongue-palate contact (T3)”, “Duration of tongue-palate contact (T4)”, “Duration of return to rest (T5)” and “Total swallowing duration (T6)”. In the periphery of the tongue, we measured “Total swallowing duration (T7)” and qualitatively assessed the tongue waveform as well. Results : In the center of the tongue, T3, T5 and T6 were significantly longer in the subject group than in the control group. In the periphery of the tongue, T7 was also significantly longer in the subject group than in the control group. The tongue position of patients with mandibular prognathism tends to be low, so a longer time was necessary to lift the tongue to the palate and the anchoring effect of the contact between the tip of the tongue and the anterior palate became weak. Due to this, a longer swallowing time at the periphery of the tongue was possibly needed in the subject group. Further, the type of tongue movement seems to have been specialized because of frequent up-and-down movement of the tongue during swallowing. Conclusions : The present findings suggest that patients with mandibular prognathism, due to their morphological disharmony, need excessive time to lift the tongue surface to the palate, resulting in a longer swallowing time at the periphery of the tongue as well as a specialized tongue movement.","PeriodicalId":102257,"journal":{"name":"The Japanese Journal of Jaw Deformities","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133154136","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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