出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.14, no.3, pp.226-241, 2004-12-15 (Released:2011-02-09)

著者

山内 健介 金氏 毅 野上 晋ノ介 山下 善弘 高橋 哲 永山 純一郎 酒井 香織 酒井 昭行

出版者

THE JAPANESE SOCIETY FOR JAW DEFORMITIES

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.20, no.3, pp.205-210, 2010-08-15 (Released:2012-03-16)

参考文献数

20

被引用文献数

1 4

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The most frequently used techniques for correcting skeletal Class III deformity are sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO). The purpose of this study was to compare the clinical outcome including skeletal stability after SSRO with semirigid fixation and IVRO. The subjects of this study were 23 patients who underwent SSRO for mandibular setback with semirigid fixation by titanium miniplate and 20 patients who underwent IVRO for mandibular setback without interosseous fixation. The mean period of maxillo-mandibular fixation was 5.1 days in the SSRO group and 7.3 days in the IVRO group. The evaluation items were skeletal changes, operation time, blood loss, sensory disturbance, temporomandibular joint (TMJ) sound and mandibular range of motion (ROM). Compared with the SSRO group, the B-point and pogonion moved significantly posteriorly in the IVRO at more than 6 months after surgery. Operation time, blood loss and occurrence of sensory disturbance were also less than those in the SSRO group. There were no significant differences in TMJ sound and ROM. The results of this study showed that both methods had minimal relapse and no significant difference in comparison by measurement of B-point and pogonion. In conclusion, both methods are effective for correcting skeletal Class III malocclusion, and the surgical method should be selected in consideration of each clinical distinction.

著者

齊藤 力

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.25, no.2, pp.59-60, 2015 (Released:2015-06-12)

著者

島峯 隆浩 米満 郁男 渋谷 直樹 纐纈 美沙子 今井 治樹 藤田 紘一 大村 進 小野 卓史

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.28, no.3, pp.226-234, 2018 (Released:2018-09-28)

参考文献数

38

被引用文献数

2

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This study aimed to compare cephalometric changes in the upper airway morphology, including the hyoid bone position, after the conventional Le Fort I (LF) osteotomy, and an LF and horse-shoe osteotomies. Twenty-two patients diagnosed as having skeletal maxillary protrusion at the Department of Oral and Maxillofacial Surgery/Orthodontics, Yokohama City University Medical Center, were included. They were divided into two groups as follows: 13 patients underwent LF and sagittal split ramus osteotomies (LF group); and 9 patients underwent LF, horse-shoe and sagittal split ramus osteotomies (HS group). The following linear variables were measured on lateral cephalometric radiographs taken before (T0), immediately after (T1), and 1 year after (T2) surgery: palatal pharyngeal space (PPS), the length from the posterior pharyngeal wall to the posterior nasal spine (PNS); superior posterior palatal space (SPPS), the length from the posterior pharyngeal wall to the middle point between the PNS and the lowest point of the soft palate; middle posterior palatal space (MPS), the length from the posterior pharyngeal wall to the lowest point of the soft palate; inferior posterior palatal space (IPS), the length from the posterior pharyngeal wall to the tongue passing the lowest point of the second cervical vertebra; epiglottic pharyngeal space (EPS), the length from the posterior pharyngeal wall to the tongue passing the front end of the epiglottis; S-H, the length from the lowest point of the hyoid bone to the Sella; and C3-H, the length from the lowest point of the hyoid bone to the lowest front point of the second cervical vertebra. Statistical analyses were performed using the Mann-Whitney U test. P values of <0.05 indicated statistical significance. SPPS and MPS decreased at T2 in the HS group. IPS and EPS increased at T1 in both groups but decreased at T2 in the HS group. S-H decreased at T1 in both groups and at T2 in the LF group. C3-H increased at T1 in both groups but decreased at T2 in the HS group. The anteroposterior diameter of the oropharynx was unchanged in the LF group because the tongue moved upward after the palate moved upward but changed in the HS group because the tongue moved backward and the oral volume decreased due to the absence of palatal segment movement. In conclusion, the anteroposterior diameter of the oropharynx decreased after backward and upward movements of the maxilla by LF and HS in the patients with skeletal maxillary protrusions.

著者

廣瀬 美帆 吉田 建美

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.17, no.3, pp.221-228, 2007-08-15 (Released:2011-02-09)

参考文献数

20

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For orthodontists, it is important to maintain the stability of occlusion and soft tissue after orthodontic treatment. This article presents a patient orthodontic retreated with glossectomy 13 years after orthognathic surgery. The patient was a 33-year-old female. She had undergone orthognathic surgery at 19 years old.Although glossectomy had been recommended because of macroglossia tendency at that time, it was not per-formed. Thirteen years after orthognathic surgery, unstable occlusion and exposure of lower incisor tooth roots developed. The countermeasure against this condition, orthodontic treatment with glossectomy and gingival transplant, was taken, as she was willing to accept any necessary treatment. As the re-treatment result was good, we report it.

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.18, no.2, pp.96-105, 2008 (Released:2011-02-09)

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.25, no.4, pp.259-271, 2015-12-15 (Released:2015-12-25)

著者

高橋 功次朗 丹原 惇 森田 修一 小林 正治 池田 順行 林 孝文 齋藤 功

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌

巻号頁・発行日

vol.27, no.1, pp.1-7, 2017

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Cephalometric prediction is still widely used for treatment planning in surgical orthodontic patients. However, there have been few reports on the relationship between mandibular midline changes by orthognathic surgery and the amount of bilateral setback movement on lateral cephalograms. The aim of this study was to clarify the relationships between the difference in mandibular setback amount for deviated and non-deviated sides and the amount of middle region displacement on cephalometric prediction in patients with mandibular prognathism and deviation.<br>The subjects comprised 15 patients diagnosed as mandibular prognathism with skeletal deviation at the orthodontic clinic, Niigata University Medical and Dental Hospital. All patients underwent only mandibular setback surgery involving midline correction by sagittal split ramus osteotomy(SSRO). Frontal and lateral cephalograms taken just before and immediately after orthognathic surgery were used for measurements. X-Y coordinates were constructed using the occlusal plane on the preoperative lateral cephalogram for the X coordinate and the perpendicular line drawn intersecting the X line at the Sella for the Y coordinate. The amount of posterior movement of the distal segment and middle region displacement were determined by superimposition of pre-and postoperative lateral cephalograms. The postoperative midline changes were measured linearly using a study model taken at just before orthognathic surgery. We examined the relationship between the average amount of operative movement for deviated and non-deviated sides and the amount of anteroposterior changes of the incisal region. The relationship between the difference in operative movement for deviated and non-deviated sides and postoperative midline changes was also examined.<br>Significant correlations were found between the bilateral difference of operative movement and the amount of anteroposterior changes of the incisal region. A significant correlation was also revealed between the bilateral difference of operative movement and horizontal middle region. In addition, a significant regression formula was obtained as β=0.65α+1.17(α: bilateral difference of mandibular posterior movement (mm), β: lateral movement of mandibular midline(mm))by regression analysis.<br>The present results suggest that, in cases with skeletal deviation, it is possible to regard the average value of anteroposterior movement of distal segments on both sides as a predictive factor for the posterior position of the incisal region. Also, the results suggest that the amount of midline correction can be predicted from the bilateral difference of operative movement. Since there is diversity and much variation in the movement of distal segments, it is not easy to predict the amount of midline displacement during orthognathic surgery. However, this regression formula may be useful for orthodontists and surgeons to plan surgical orthodontic treatment.

著者

栗原 祐史 勝田 秀行 山口 徹太郎 安田 有沙 塩竃 素直 佐藤 仁 斉藤 芳郎 鴨志田 慎之助 鎌谷 宇明 代田 達夫

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.27, no.1, pp.17-23, 2017-04-15 (Released:2017-05-02)

参考文献数

9

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We report two cases of genioplasty performed using a navigation system. In recent years, virtual orthognathic surgeries have been performed using simulation software with data from preoperative computed tomography (CT), and the osteotomy design, direction and distance of bony segment movement have been established. Despite the accuracy of simulations using three-dimensional CT data, results obtained from simulations cannot be effectively applied to clinical practice unless comparisons can be made to actual surgery. We report our experience of performing genioplasty using simulation software with preoperative CT data, and established the osteotomy design as well as the direction and distance of bony segment movement. Simulation-guided navigation osteotomy was performed with reference to simulation results transferred to the navigation system. A reference antenna was attached to the head of the patient using a headband. Next, interfacing laser registration was performed. Osteotomy was then performed along the osteotomy line drawn on the chin bone surface using piezosurgery and a tracker, and the bone segment was mobilized by down-fracture using a bone saw. Using the image of the simulated repositioned bone segment shown on the navigation system screen, the bone segment was moved to the determined position and fixed. Our results suggest that use of a navigation system allows safer, more precise genioplasty.

著者

上杉 俊輔 米満 郁男 小海 暁 大村 進 小野 卓史

出版者

THE JAPANESE SOCIETY FOR JAW DEFORMITIES

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.24, no.1, pp.27-36, 2014-04-15 (Released:2014-04-23)

参考文献数

23

被引用文献数

2 3

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In subjects with facial asymmetry, it is generally accepted that the maxillary frontal occlusal plane inclines toward the deviated side of the mandible. However, a few patients with facial asymmetry have their frontal occlusal planes inclined toward the contralateral side of the mandibular deviation. The aim of this study was to elucidate the morphological features of the subjects with mandibular deviation with the frontal occlusal planes inclined toward the contralateral side.The sample consisted of 40 patients whose Menton was deviated at least 2.0 mm from the facial midline. They were divided into two groups based on the relationship between the side of inclination of the frontal occlusal plane and the side of the mandibular deviation. Group IL consisted of 20 patients whose frontal occlusal plane inclined to the ipsilateral side of the mandibular deviation, while Group CL consisted of 20 patients whose frontal occlusal plane inclined to the contralateral side of the mandibular deviation. Then, we compared the two groups using 1) lateral cephalometric analysis, 2) P-A cephalometric analysis, 3) frontal soft tissue analysis and 4) dental casts analysis. The following findings were obtained:1. In Group CL patients, not only the frontal occlusal plane defined by bilateral molar positions, but also the maxilla itself significantly inclined toward the contralateral side of the mandibular deviation.2. In Group CL patients, the maxillary dental midline was significantly deviated toward the contralateral side of the mandibular deviation.3. The difference in bilateral mandibular ramus lengths was significantly smaller in Group CL patients.4. In Group CL patients, the mandibular molar compensation for the mandibular lateral deviation was significantly less than that in Group IL patients.5. In Group CL patients, both the midline and cant of the upper lip were significantly deviated toward the contralateral side of the mandibular deviation.6. The incidence of missing or buccolingual version of maxillary premolar teeth was significantly higher in Group CL patients.