Bulletin of Tokyo Dental College最新文献_第5页

A Case of Mandibular Cancer Involving Almost Entire Attached Gingiva. 下颌骨癌累及几乎整个附著牙龈1例。

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Bulletin of Tokyo Dental College Pub Date : 2021-12-04 Epub Date: 2021-11-15 DOI: 10.2209/tdcpublication.2020-0059

Hideki Ichikawa, Miki Watanabe, Syuntaro Nomoto, Junko Yagisawa, Aki Ito, Jun-Ichi Tanaka

引用次数: 0

Survival Rate of Removable Partial Dentures with Mandibular Bilateral Free End Saddle: A Retrospective Study. 下颌双侧游离端鞍座可摘局部义齿成活率的回顾性研究。

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Bulletin of Tokyo Dental College Pub Date : 2021-12-04 Epub Date: 2021-11-15 DOI: 10.2209/tdcpublication.2020-0061

Koichi Yoshino, Koji Ito, Masahiko Kuroda, Naoki Sugihara

{"title":"Survival Rate of Removable Partial Dentures with Mandibular Bilateral Free End Saddle: A Retrospective Study.","authors":"Koichi Yoshino, Koji Ito, Masahiko Kuroda, Naoki Sugihara","doi":"10.2209/tdcpublication.2020-0061","DOIUrl":"https://doi.org/10.2209/tdcpublication.2020-0061","url":null,"abstract":"The purpose of this study was to investigate the survival of removable partial dentures with a mandibular bilateral free end saddle (BFES) and abutment teeth in a clinical setting. Only mandibular dentures with a BFES were included (10 or fewer present teeth, and fewer than 4 occlusal units). The endpoints were replacement of denture and loss of abutment teeth. A total of 128 dentures and 595 abutment teeth were analyzed. Nineteen dentures had to be replaced during the observation period (mean duration: 11.4±6.9 years; range: 3 to 36 years). According to Kaplan-Meier analysis, the survival rate was 93.2% at 10 years and 68.6% at 20 years. The estimated mean survival period was 27.8 years. Single-factor analysis using the log-rank test showed that no factor investigated had a significant influence. The main reason for denture replacement was loss of abutment teeth (47.4%). The survival rate of the abutment teeth was 91.3% at 10 years and 77.3% at 20 years. The analysis revealed 4 significant risk factors: male sex (hazard ratio [HR]: 1.78); premolars (HR: 1.67); a lower number of abutment teeth (HR: 3.24); and history of endodontic treatment (HR: 2.79). The removable partial dentures with a mandibular BFES in this study lasted over 20 years, and their survival was influenced by loss of abutment teeth. Dentures are used continuously over long periods of time and should therefore be designed to allow easy adjustment when abutment teeth are lost.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 4","pages":"205-214"},"PeriodicalIF":0.5,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39711182","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}

引用次数: 2

Three-Dimensional Evaluation of Pharyngeal Morphology in Bimaxillary Surgery with and without Horseshoe Osteotomy in Skeletal Class III Cases. 骨性ⅲ类患者双颌手术伴与不伴马蹄截骨的咽部形态三维评价。

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Bulletin of Tokyo Dental College Pub Date : 2021-12-04 Epub Date: 2021-11-15 DOI: 10.2209/tdcpublication.2021-0003

Naoyuki Yoshino, Yasushi Nishii, Takashi Kamio, Takashi Takaki, Takahiko Shibahara, Kenji Sueishi

{"title":"Three-Dimensional Evaluation of Pharyngeal Morphology in Bimaxillary Surgery with and without Horseshoe Osteotomy in Skeletal Class III Cases.","authors":"Naoyuki Yoshino, Yasushi Nishii, Takashi Kamio, Takashi Takaki, Takahiko Shibahara, Kenji Sueishi","doi":"10.2209/tdcpublication.2021-0003","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0003","url":null,"abstract":"Repositioning of the jaw in orthognathic treatment generates changes in the soft tissues of the maxillofacial region, with consequent changes in the airway. The purpose of this study was to determine how type of orthognathic surgical procedure affected the 3-dimensional morphology of the upper airway. Forty patients were divided into the following 2 groups according to the type of surgical procedure used: a horseshoe osteotomy (HS) group (20 patients, comprising 11 men and 9 women; average age 24.3±4.5 years) who underwent bimaxillary surgery; and a LeFort I osteotomy (LF) group (20 patients, comprising 8 men and 12 women; average age 22.5±4.6 years) who also underwent bimaxillary surgery. Cephalometric measurements were taken and 3-dimensional pharyngeal morphology evaluated in each group. The amounts of maxilla rotation, posterior maxilla impaction, and mandibular setback all revealed a significantly larger value in the HS group. Evaluation of pharyngeal volume revealed a significant decrease in the upper pharyngeal segment in the LF group. A significant decrease in the lower pharyngeal segment was observed in both groups. Differences were noted in postoperative pharyngeal morphology between the two groups. The results of this study suggest that HS has less effect on the upper pharyngeal segment, regardless of the amount of posterior maxilla impaction.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 4","pages":"215-226"},"PeriodicalIF":0.5,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39711183","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}

引用次数: 1

Diagnosing Trigeminal Neuralgia Based on Clinical Diagnostic Reasoning in an Elderly Patient. 基于临床诊断推理的老年三叉神经痛诊断。

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Bulletin of Tokyo Dental College Pub Date : 2021-12-04 Epub Date: 2021-11-15 DOI: 10.2209/tdcpublication.2021-0012

Sho Usuda, Wataru Muraoka, Seiji Asoda, Nobuyuki Horie, Taneaki Nakagawa, Takehito Ouchi

{"title":"Diagnosing Trigeminal Neuralgia Based on Clinical Diagnostic Reasoning in an Elderly Patient.","authors":"Sho Usuda, Wataru Muraoka, Seiji Asoda, Nobuyuki Horie, Taneaki Nakagawa, Takehito Ouchi","doi":"10.2209/tdcpublication.2021-0012","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0012","url":null,"abstract":"When pain adversely affects a patient's activities its diagnosis needs to be fast and accurate to allow effective treatment to be commenced as soon as possible. Difficulties may be found in achieving this, however, in elderly patients with age-associated cognitive decline, as they may not be capable of properly understanding or recalling their symptoms. The present case concerns a 77-year-old woman who presented with the chief complaint of pain in the right mandible persisting throughout the day, and severe enough to necessitate her lying down in bed all day long. The use of open-ended questions followed by a structured interview focused on pain with closed-ended questions revealed that she experienced paroxysms of pain throughout the day and that she was afraid of its occurrence. Based on these findings, the diagnosis was trigeminal neuralgia. Carbamazepine decreased the pain with no side effects. The patient continued taking carbamazepine for 3 months, during which time she was closely monitored for adverse reactions. No side effects, such as drowsiness or dizziness, were observed, however, and the pain subsided completely with no recurrence, even after cessation of carbamazepine.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 4","pages":"253-260"},"PeriodicalIF":0.5,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39711185","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}

引用次数: 0

Airway Management Strategy Using Seldinger Minitracheostomy Kit to Prevent Airway Obstruction after Oral Cancer Surgery: A Retrospective Study. 使用Seldinger小气管造口术预防口腔癌术后气道阻塞的气道管理策略:回顾性研究。

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Bulletin of Tokyo Dental College Pub Date : 2021-12-04 Epub Date: 2021-11-15 DOI: 10.2209/tdcpublication.2021-0007

Kyotaro Koshika, Keikoku Tachibana, Tatsuki Hoshino, Reiko Terashima, Reina Okada, Takashi Ouchi, Toshiya Koitabashi

{"title":"Airway Management Strategy Using Seldinger Minitracheostomy Kit to Prevent Airway Obstruction after Oral Cancer Surgery: A Retrospective Study.","authors":"Kyotaro Koshika, Keikoku Tachibana, Tatsuki Hoshino, Reiko Terashima, Reina Okada, Takashi Ouchi, Toshiya Koitabashi","doi":"10.2209/tdcpublication.2021-0007","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0007","url":null,"abstract":"A minitracheostomy (MTS) is performed after surgery for oral cancer at our institution in patients who are at risk of postoperative airway obstruction. The aim of this study was to evaluate outcomes of preventive airway management with this procedure. A total of 105 patients undergoing preventive airway management with a Seldinger MTS kit after oral cancer surgery between October 2014 and March 2020 were enrolled. Information on patient characteristics, time required for the MTS, duration of tracheal cannula placement, and MTS-related complications was obtained from both the medical and anesthesia records. In addition, the numbers of postoperative instances of tracheotomy between April 2009 and September 2014 and extubation between October 2014 and March 2020 were also counted for a comparison. The time required for an MTS was 3.2±2.6 min. Minor complications, including mild subcutaneous or mediastinal emphysema and bleeding, were found in 5 patients, but all recovered in a short time. The median duration of tracheal cannula placement was 2 days, with a range of from 0 to 8 days. A total of 348 oral cancer surgeries were performed between April 2009 and September 2014. Among patients undergoing these procedures, 111 underwent a tracheostomy (32%), 235 extubation (68%), and 2 sustained intubation. A total of 580 oral cancer surgeries were performed between October 2014 and March 2020. Here, 121 patients underwent a tracheostomy (21%), 105 an MTS (18%), and 354 extubation (61%). The results suggest that an MTS can be performed safely and smoothly with no significant complications. They also suggest that an MTS reduces the need for a full tracheostomy and the risk of airway obstruction after extubation. We conclude that airway management strategy with an MTS is a useful option in preventing airway obstruction following oral cancer surgery.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 4","pages":"227-234"},"PeriodicalIF":0.5,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39711184","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}

引用次数: 0

A Validation Study of the National Database of Health Insurance Claims and Specific Health Checkups of Japan Regarding the Annual Number of Tooth Extractions Performed Across the Entire Japanese Population. 日本全国健康保险索赔和特定健康检查数据库关于整个日本人口每年拔牙数量的验证研究。

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Bulletin of Tokyo Dental College Pub Date : 2021-12-04 Epub Date: 2021-11-15 DOI: 10.2209/tdcpublication.2021-0019

Seitaro Suzuki, Naoki Sugihara, Hideyuki Kamijo, Manabu Morita, Takayuki Kawato, Midori Tsuneishi, Keita Kobayashi, Yoshihiro Hasuike, Tamotsu Sato

{"title":"A Validation Study of the National Database of Health Insurance Claims and Specific Health Checkups of Japan Regarding the Annual Number of Tooth Extractions Performed Across the Entire Japanese Population.","authors":"Seitaro Suzuki, Naoki Sugihara, Hideyuki Kamijo, Manabu Morita, Takayuki Kawato, Midori Tsuneishi, Keita Kobayashi, Yoshihiro Hasuike, Tamotsu Sato","doi":"10.2209/tdcpublication.2021-0019","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0019","url":null,"abstract":"This report describes a validation study of data in the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB) obtained by nationwide surveys on tooth extractions. The following 3 data sources on tooth extractions in Japan were compared: (1) the Nationwide Survey of the Reasons for Permanent Tooth Extractions in Japan (a previous survey conducted by the present authors); (2) the Statistics on Medical Care Activities in Public Health Insurance; and (3) the 4th NDB Open Data Japan. Source 1 was a nationwide survey conducted in 2018; sources 2 and 3 comprised data that are freely available for use by the public. In Source 1, 2,345 of 5,250 dentists approached responded to the questionnaire (recovery rate: 44.8%). The number of extracted teeth among younger age groups (aged 25-50 years) reported in Source 1 was lower than that in the other two sources. In contrast, the number of extracted teeth among older age groups reported in Source 1 was higher than that reported in the other two sources. However, when stratified by age group, all differences across the 3 sources regarding the mean annual number of tooth extractions were <0.05 teeth/year. The present results suggest that the NDB is a reliable resource for data on tooth extractions performed across the entire Japanese population.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 4","pages":"235-243"},"PeriodicalIF":0.5,"publicationDate":"2021-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39711186","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}

引用次数: 1

Influence of Simulated Loss of Posterior Occlusal Support on Three-dimensional Condylar Displacement. 模拟后牙合支撑缺失对三维髁移位的影响。

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Bulletin of Tokyo Dental College Pub Date : 2021-09-08 Epub Date: 2021-08-15 DOI: 10.2209/tdcpublication.2020-0052

Ryo Sakai, Shuichiro Yamashita

{"title":"Influence of Simulated Loss of Posterior Occlusal Support on Three-dimensional Condylar Displacement.","authors":"Ryo Sakai, Shuichiro Yamashita","doi":"10.2209/tdcpublication.2020-0052","DOIUrl":"https://doi.org/10.2209/tdcpublication.2020-0052","url":null,"abstract":"The objective of this study was to verify whether loss of posterior occlusal support induced displacement of the mandibular condyles from a physiological point of view. Stabilization-type splints were fabricated for 12 healthy dentulous individuals. Each splint was designed to cover the bilateral maxillary teeth up to the second molars. To reproduce loss of posterior occlusal support, the extent of the splint was reduced one tooth at a time, bilaterally, starting from the back and moving forward sequentially. Tapping movement and lateral excursions were performed with each splint and a jaw movement tracking device with 6-degrees of freedom used to observe condylar displacement. Evaluation of 3-dimensional (3-D) displacement of the kinematic axis of the condyle during experimental jaw movement was performed under each occlusal condition with occlusal contact on all teeth, including the maxillary second molars. The habitual closing position was used as the reference. An increase was observed in 3-D displacement of the kinematic axis at the terminal point of the tapping movement with loss of occlusal support, and significant differences were observed in both condyles. An increase was also observed in 3-D displacement of the kinematic axis on the working side during lateral excursion with loss of occlusal support, and a statistically significant difference was observed in the left condyle. A small increase was observed in 3-D displacement of the kinematic axis on the non-working side during lateral excursion with loss of occlusal support. The results of this study suggest that loss of posterior occlusal support induces displacement of the mandibular condyles, suggesting that occlusal support in the molar region is an important factor in stabilization of the condylar position.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 3","pages":"137-150"},"PeriodicalIF":0.5,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39311573","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}

引用次数: 0

Characteristic Distribution of Hematopoietic Cells in Bone Marrow of Xenopus Laevis. 非洲爪蟾骨髓中造血细胞的特征分布。

IF 0.5

Bulletin of Tokyo Dental College Pub Date : 2021-09-08 Epub Date: 2021-08-15 DOI: 10.2209/tdcpublication.2020-0053

Sumiharu Morita, Takeshi Moriishi, Satoru Matsunaga, Kei Kitamura, Shin-Ichi Abe, Akira Yamaguchi

{"title":"Characteristic Distribution of Hematopoietic Cells in Bone Marrow of Xenopus Laevis.","authors":"Sumiharu Morita, Takeshi Moriishi, Satoru Matsunaga, Kei Kitamura, Shin-Ichi Abe, Akira Yamaguchi","doi":"10.2209/tdcpublication.2020-0053","DOIUrl":"https://doi.org/10.2209/tdcpublication.2020-0053","url":null,"abstract":"Bone marrow is the principal site of hematopoiesis in mammals. Amphibians were the first phylogenetic group in vertebrates to acquire bone marrow, but the distribution of hematopoietic cells in the bone marrow of the primitive frog, Xenopus laevis (X. laevis) has not been well documented. The purpose of this study was to perform a histological investigation of the distribution of hematopoietic cells in femoral bone marrow at various stages of development in X. laevis. Hematopoietic cells showed preferential distribution on the endosteal surface of cortical bone throughout all stages of development, from tadpole to aged frog. In mature frogs, hematopoietic cells appeared at the boundary between the epiphysis and the bone marrow. The distribution of hematopoietic cells around the blood vessels was limited to a small number of vessels in the bone marrow. Abundant adipose tissue was observed in the bone marrow cavity from the tadpole stage to the mature frog stage. Hematopoietic cells showed preferential distribution in a belt-like fashion on the surface of newly-formed bones in a bone regeneration model in the diaphysis of X. laevis. These results indicate that the distribution of hematopoietic cells in bone marrow in X. laevis differs from that in mammals, and that the bone marrow of X. laevis constitutes a useful model for exploring the mechanism underlying the phylogenetic differentiation of bone marrow hematopoiesis.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 3","pages":"171-180"},"PeriodicalIF":0.5,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39311574","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}

引用次数: 1

Effect of Lip-seal Resistance Training on Lip-seal Strength in Young Adults. 封唇阻力训练对青少年封唇力量的影响。

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Bulletin of Tokyo Dental College Pub Date : 2021-09-08 Epub Date: 2021-08-15 DOI: 10.2209/tdcpublication.2020-0058

Masahiro Ryu, Takeshi Oki, Midori Ohta, Kaoru Sakurai, Takayuki Ueda

{"title":"Effect of Lip-seal Resistance Training on Lip-seal Strength in Young Adults.","authors":"Masahiro Ryu, Takeshi Oki, Midori Ohta, Kaoru Sakurai, Takayuki Ueda","doi":"10.2209/tdcpublication.2020-0058","DOIUrl":"https://doi.org/10.2209/tdcpublication.2020-0058","url":null,"abstract":"Lip-seal strength is important for articulating bilabials, capturing food during eating, maintaining fluid within the oral cavity before swallowing, and achieving swallowing pressure. The objective of this study was to investigate the effect of lip-seal resistance training on lip-seal strength in young adults. The participants comprised 15 young healthy adults aged 26-34 years, all with complete dentition. Each was required to perform lip-seal resistance training 5 weekdays a week for 4 weeks with a commercially available instrument for that purpose. The instrument was placed on the midline, left corner, and right corner of the mouth, and pulled forward, leftward, and rightward, respectively. The participants were required to pull the training instrument forcefully while resisting by closing the lips together as strongly as possible until the instrument exited the lips. Lip-seal strength was measured at before and after training using a measurement device. Change in lip-seal strength between before and after training was analyzed using the Wilcoxon signed rank test. The mean lip-seal strength was 8.9±1.5 N before training and 10.4±1.8 N after. A significant difference was observed in lip-seal strength between before and after training (p=0.003), and the mean increase during the training period was 18.1±17.6%. The results showed that lip-seal resistance training for 4 weeks increased lip-seal strength in young adults. These findings suggest that training that involves pulling not only in a forward direction, but also in bilateral directions strongly stimulates the orbicularis oris muscle, resulting in an increase in lip-seal strength.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 3","pages":"163-170"},"PeriodicalIF":0.5,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39311575","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}

引用次数: 3

Three-Dimensional Analysis of Soft and Hard Tissue Changes following Orthognathic Surgery. 正颌手术后软硬组织变化的三维分析。

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Bulletin of Tokyo Dental College Pub Date : 2021-09-08 Epub Date: 2021-08-15 DOI: 10.2209/tdcpublication.2020-0021

Yoshiko Onaga, Takashi Kamio, Takashi Takaki, Takahiko Shibahara

{"title":"Three-Dimensional Analysis of Soft and Hard Tissue Changes following Orthognathic Surgery.","authors":"Yoshiko Onaga, Takashi Kamio, Takashi Takaki, Takahiko Shibahara","doi":"10.2209/tdcpublication.2020-0021","DOIUrl":"https://doi.org/10.2209/tdcpublication.2020-0021","url":null,"abstract":"Change in soft tissue in relation to that in hard tissue following orthognathic surgery was evaluated. Twenty-five patients were enrolled in the study. The diagnosis in all was jaw deformity (maxillary retrusion and mandibular protrusion) and all underwent a Le Fort I osteotomy and bilateral sagittal splitting ramus osteotomy. Three-dimensional (3D) computer-aided design (CAD) models (polygon models) of the hard and soft tissue of the maxilla and mandible were constructed and superimposed. Reference points were established on the pre- and postoperative hard and soft tissues. Specific elements of each reference point were divided into X, Y, and Z components, respectively, and the distances in each direction and 3D distance (normal distance) measured. The Wilcoxon signed-rank test was used to determine differences in the mean values for the distance moved of each element as the error between pre- and postoperatively. The results revealed statistically significant differences in the Y-direction in the maxilla and the X- and Z-directions in the mandible. A significant difference was also observed in the 3D distances of the maxilla and mandible. Little evidence was found of linearity between the amount of hard and soft tissue movement in the X- and Z-directions in the maxilla. This means that 3D movement in the maxilla was masked more by changes in the morphology of the soft tissue than in the mandible, making it less evident. The results of this study suggest that the 3D analysis method used enables changes in hard and soft tissues to be understood qualitatively, and that it can be used in diagnosis and treatment in orthognathic surgery. It may also be useful in simulation of morphological change in soft tissue.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"62 3","pages":"151-161"},"PeriodicalIF":0.5,"publicationDate":"2021-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39311621","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}

引用次数: 1