著者

重政 理香 高野 伸夫 中野 洋子

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.241-248, 2015-12-15 (Released:2015-12-25)

参考文献数

24

被引用文献数

2 2

---

Objective: There have been many previous reports about the relationships between jaw deformity and articulation disorders, but most of such studies were conducted in cases with mandibular prognathism. In contrast, well-defined studies have not been conducted to date in patients with retrognathia although it is considered that such patients have articulation disorders because of the relationship with tegmentum in the anterior tooth area and association with abnormality of the perioral muscles. We previously reported on the effects of orthognathic surgery on vowel sounds in patients with retrognathia. The purpose of this study was to investigate the influence of orthognathic surgery on poor articulation of Japanese consonants in cases with retrognathia. Materials and Methods: The eight consonant sounds [ka], [ki], [sa], [ɕi], [ta], [tɕi], [pa], [pi] were recorded as speech samples. The investigation was carried out in 11 Japanese female patients with mandibular retrognathia requiring surgery for jaw deformity and malocclusion both at the preoperative and postoperative stages of 3 and 6 months. These subjects were compared with 10 healthy controls. The duration of the consonant sound and the sound pressure level were analyzed. Results: The duration of the consonant sounds [ka], [ki], [ɕi] and [tɕi] was significantly longer in patients with mandibular retrognathia compared with the controls. The duration of the consonant sounds except [pa] and [pi] after the operation was generally shorter than before the operation. Especially, significant shortening was observed in [ki] in the comparison between before and 6 months after the operation. The sound pressure level for [ki] and [tɕi] was significantly smaller. No significant differences were found in the sound pressure level of the consonant sounds between before and after the operation, but the level was getting larger by 6 months after the operation. Conclusion: In patients with mandibular retrognathia, the duration of consonants was extended especially in the alveolar fricative sound, velar plosive, and alveolar affricate; furthermore, the sound pressure level was low. However, the articulation disorders tended to be reduced at 6 months after orthognathic surgery by correcting the occlusion and jaw position.

著者

片桐 渉 小林 正治 佐々木 朗 須佐美 隆史 須田 直人 田中 栄二 近津 大地 冨永 和宏 森山 啓司 山城 隆 齋藤 功 高橋 哲

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.30, no.3, pp.213-225, 2020 (Released:2020-09-11)

参考文献数

21

被引用文献数

2 2

---

The Japanese Society for Jaw Deformities performed a nationwide survey from 2006 to 2007 and the results were reported in 2008. In the last 10 years, new surgical procedures and medical devices have been developed and brought major changes to surgical orthodontic treatment. Accordingly, we need to assess the current status of surgical orthodontic treatment.A nationwide survey of surgical orthodontic treatment between April 2017 and March 2018 was carried out and 99 surgical facilities and 64 orthodontic facilities were enrolled in the survey. The number of patients who received orthognathic surgery was 3,405, about 69% of whom were diagnosed with mandibular protrusion. Before the surgery, 3D-simulation was performed for about 40% of patients at both surgical and orthodontic facilities. Computer-aided design and computer-aided manufacturing (CAD/CAM) wafers were used at 12.1% of surgical facilities and at 17.7% of orthodontic facilities. Sagittal split ramus osteotomy (SSRO) was performed in 2,768 patients (85.5%) and Le FortⅠosteotomy in 1,829 patients (56.5%). Blood loss during the surgery was reduced compared with that in the previous survey. Autologous blood transfusion tended to be performed in cases as necessary such as surgery for maxilla and anemia of the patient. Duration of intermaxillary fixation and hospital stay were also shortened. This survey revealed the current status of surgical orthodontic treatment in Japan in comparison with the previous survey.

著者

藤沢 孝司 秋山 順史 若杉 正則 松下 文彦 鈴木 浩之 式守 道夫 水野 明夫 橋本 賢二

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.2, no.1, pp.79-83, 1992-04-30 (Released:2011-02-09)

参考文献数

7

---

A case of mandibular prognathism with Marfan's syndrome treated with sagittal splitting ramus osteotomy was presented.A 37 year-old man, complaining of difficulty of mouth opening was referred to our clinic. The patient was diagnosed as bilateral temporomandibular joints arthrosis with mandibular prognathism.Although occlusal treatment with bite splint was effective to some extent, intermittent trismus did not disappear, so bilateral sagittal splitting ramus osteotomy was performed to correct his dental malocclusion.Postoperative course was not eventful and his range of mouth opening increased to 35mm between incisal edges of maxillary and mandibular central incisor.

著者

笠原 貴仁 吉武 博美 石井 浩一郎 藤本 拓司 伊東 隆利 伊東 隆三

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.3, pp.230-235, 2008-08-15 (Released:2011-02-09)

参考文献数

10

被引用文献数

1

---

Schizophrenia is an inherent disease that causes disruption of thinking patterns, sensing, self-esteem, will and emotions, resulting in mental disorder involving hallucinations and other mental symptoms.The major complaint of this 21-year-old female patient with skeletal mandibular protrusion was thought to be pain of the temporomandibular region. However, upon careful analysis based on Narrative Based Medicine, the primary concern was the mandibular protrusion with asymmetry inducing multiple psychological symptoms. Combined ortho-surgical intervention was performed to resolve this patient's problem. Although increased antidepressant intake was noted prior to the surgery, once the treatment had been performed, resulting in major improvements of the profile and appearance, dramatic mental and psychological changes for the better were noted, allowing this patient's return to a healthy and normal social life along with decreased dependency on anti-depressant drugs.

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.2, pp.86-93, 2007 (Released:2011-02-09)

著者

金子 早知子 中野 洋子 高野 伸夫

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.22, no.1, pp.20-27, 2012-04-15 (Released:2012-09-14)

参考文献数

25

---

Objective: We measured the formant frequency of vowels in retrusion patients and normal healthy control patients, and made a comparative study of the purpose in phonology. We wanted to know how orthognathic surgery has influenced the articulation of vowels in patients. We investigated how the relationships between the position of the maxilla and mandible and incisor occlusion affected vowel sounds. And because resonance space is believed to affect sound frequencies, we investigated the effect of the width of the airway preoperatively and postoperatively on vowel sounds.Methods: Five vowel sounds in 10 Japanese patients with mandibular retrusion requiring surgery for jaw deformity and malocclusion preoperatively and at 3 and 6 months postoperatively were recorded and compared with those in normal healthy control patients. Also, the effect of the positional relationship between the maxilla and the mandible and incisor occlusion on these vowel sounds was investigated by correlating skeletal and denture patterns of cephalometric measurements taken preoperatively and at 3 months postoperatively with these vowel sounds. The width of the airway was measured preoperatively and 3 months after the operation, and the correlation with the frequency of the vowels was examined.Results: In /e/ F1, /o/ F2-F1, significant differences were observed between the preoperative patients and the control patients. However, these differences disappeared at 3 and 6 months postoperatively.A significant difference was admitted with F1 of /a/ and F1 of /e/ in comparing the preoperative with the postoperative patients 6 months by a rank test with a sign of Wilcoxon.Both preoperatively and postoperatively, positive correlations were observed between F2-F1 the narrow, open vowels /i/ with SNA and SNB. In the preoperative patients, some correlations were observed between F1 the semi-narrow, open vowel /e/ and denture patterns.Significant increases were observed between the preoperative and 3 months postoperative patients in the width of the hypopharyngeal cavity. Many correlations were observed between the change of width of the airway and the vowel frequency, particularly in the posterior tongue vowel /u/. But other vowels had few correlations.Conclusion: A change of occlusion of the front teeth and a change of frame by the mandible correction operation greatly influenced close vowels and half close vowels that were a front tongue vowel, especially the influence of /i/ and /e/ in retrusion patients. It was an interior tongue vowel that the change in the airway influenced the vowel frequency of only /u/.

著者

永金 則子 岩見 優子 井藤 一江 下田 美和 八塚 尋子 梶山 佳代 天野 有希 丹根 一夫

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.6, no.1, pp.51-62, 1996-04-30 (Released:2011-02-09)

参考文献数

18

被引用文献数

1

---

This study was designed to investigate the patient's recognition of changes in facial profile due to orthognathic surgery. The results of questionnaires were summarized and analyzed in relation to cephalometric data.The subjects consisted of forty-three posttreatment patients (13 males and 30 females) with mandibular prognathism, , who had undergone orthognathic surgery at Hiroshima University Dental Hospital. In this study, patient's recognition of improvement in facial profile was summarized in relation to morphologic changes associated with orthognathic surgery by means of Spearman's correlation analysis.The results were as follows:1. Before treatment, eighty-eight percent of patients were anxious about disharmony of the facial profiles, and the degree of anxiousness was severe in half of them. As for facial areas, the lower lip and chin were their greatest concern.2. After treatment, eighty-four percent of patients recognized improvement in facial profile, and sixty-three percent of patients assessed that their profiles were improved more substantially than expected before treatment. As for facial parts, more than seventy percent of patients mainly recognized improvement in lower lip and chin.3. The patient's recognition of improvement in facial profile, especially chin, exhibited a significantly positive correlation with the amount of mandibular setback during treatment.These results suggested that most patients assessed that improvement in facial profile was achieved by orthognathic surgery. It is shown that their recognition of improvement in their facial profiles is significantly correlated with the amount of mandibular setback.

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.19, no.4, pp.217-237, 2009-12-15 (Released:2012-03-16)

著者

大塚 雄一郎 藤田 昌樹 江川 広人 三條 恵介 藤本 舞 龍田 恒靖 松井 成幸 嶋田 淳 須田 直人

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.1, pp.32-41, 2015-04-15 (Released:2015-04-27)

参考文献数

30

被引用文献数

3

---

The osteotomy line in sagittal split ramus osteotomy (SSRO) has a wide variation among surgeons. Recently, short lingual osteotomy (SL), in which the lingual split is limited up to the area near the mandibular foramen, is performed in many facilities. The reason for this is that SL can reduce the amount of interference between the proximal and distal segments, and shorten the operation time compared with Obwegeser osteotomy (Ob). However, since medial pterygoid muscles (MPM) are included in the proximal segments, SL is prone to induce backward rotation and distal positioning of the mandibular ramus due to the interference between MPM and distal segments when mandibular setback is performed.The purpose of this study was to compare the postoperative outcome of SL and Ob for mandibular prognathism. Twenty-two skeletal Class III cases without lateral deviation treated by SSRO in Meikai University Hospital, were examined. Among the 22 cases, 15 and 7 cases underwent SL and Ob, respectively. The postoperative changes of the proximal and distal segments were evaluated in lateral and postero-anterior cephalograms taken immediately before the surgery (T1), immediately after the surgery (T2), and one year after the surgery (T3). At T1, there was no significant difference in SNB, FMA, or gonial angle between the SL and Ob groups. No significant difference in the amount of mandibular setback was found between the two groups. Comparing values at T1 and T2, the proximal segments tended to rotate backward in the SL group, but there was no significant difference in the anterio-posterior position of proximal segments between the two groups. Comparing values at T2 and T3, counter-clockwise rotation of proximal segments was seen in the SL group but not in the Ob group. It is likely that this rotation of proximal segments in the SL group was caused by the muscular strength of MPM attached mainly to the proximal segments. Moreover, a significant negative correlation in the amount of rotation of proximal segments was detected between T1-T2 and T2-T3 in the Ob group, but not in the SL group.These findings indicate that special attention to the rotation in SL cases is important since a wider variation in the rotation of proximal segments may occur compared with the Obwegeser method.

著者

奥村 映仁 飛田 尚慶 大場 誠悟 中尾 紀子 朝比奈 泉

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.1, pp.25-29, 2010-04-15 (Released:2012-03-02)

参考文献数

12

被引用文献数

2 7

---

In this case report, we present a surgical orthodontic treatment performed for an aged female. The patient was a 62-year-old female with chief complaints concerning occlusal disharmony, dyslalia, and aesthetic disturbance. As a result of various analysis, the patient was diagnosed with mandibular prognathism accompanied by deep bite and reversed occlusion. Due to the venerability of the patient, she presented numerous risks. The patient was treated with Le Fort I osteotomy, sagittal split ramus osteotomy and genioplasty. To acquire and to maintain a stable postoperative occlusion, close cooperation with the prothodontist was carried out. Postoperatively, the patient's chief complaints were improved and she demonstrated satisfactory progress after one year. The results of this case report indicate that treatment of a jaw deformity with surgical orthodontic procedures is effective for the improvement of occlusal disorders as well as aesthetic problems. If there are no general health problems, this treatment may be applied irrespective of the patient's age.

著者

小林 正治 小田 陽平 長谷部 大地 加藤 健介 新美 奏恵 中里 隆之 泉 直也 高田 佳之 福田 純一 高木 律男 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.16, no.3, pp.153-160, 2006-08-15 (Released:2011-02-09)

参考文献数

16

被引用文献数

2 12

---

To assess whether patients were satisfied with the results of treatment, questionnaires were sent to 291 patients who had undergone orthognathic surgery for correction of jaw deformities and 133 questionnaires were returned with valid answers. The chief problem of 94 (71%) of these patients was appearance. Dysfunctions such as masticatory disturbance and speech difficulties were the primary reason for which 38 (29%) of the patients sought treatment. Seventy-five percent of the patients answered that they were satisfied with the results in regard to their chief problems. A favorable change in appearance was recognized by 125 patients, whereas five patients noticed no major changes and three patients were displeased with their postoperative faces. The patients'evaluations of their appearance seemed to be influenced by the responses of other peoPle to the surgical-results, and objective improvements did not always satisfy their expectations. Improvements in masticatory function and speech were recognized by 92 and 54 patients, respectively. Eighty patients had TMJ signs and symptoms such as click and/or pain before treatment, which disappeared in 53 (66%) of the symptomatic patients after the surgery. On the other hand, TMJ signs and symptoms appeared postoperatively in 7 (15%) of 47 patients without those before treatment. Psychologically, 42 patients noted favorable changes in personality after the surgery. Eight patients with mandibular set back noted the onset or worsening of snoring after the surgery.

著者

佐藤 修一 川村 仁 長坂 浩 高橋 善男 茂木 克俊 大森 勇市郎 菅原 準二 三谷 英夫

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.2, no.1, pp.19-24, 1992-04-30 (Released:2011-02-09)

参考文献数

13

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Broad soft-tissue pedicle genioplasties were performed in 6 patients by horizontal osteotomy of the inferior border of the mandible, with preservation of a musculoperiosteal pedicle to the genial segment. Preoperative, immediate postoperative, and long-term follow-up lateral cephalometric radiographs were retrospectively analyzed to evaluate the osseous and soft-tissue changes of the chin. After a mean follow-up period of 29 months, all cases preserved the initial advancement. No case showed bone resorption from pogonion to the menton region.The chins advanced by broad soft-tissue pedicle genioplasty had good stability.

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.29, no.2, pp.178-201, 2019 (Released:2019-06-24)

著者

伊藤 亜希 小林 正治 松崎 英雄 田中 潤一 大畠 仁 高野 伸夫 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.17, no.4, pp.229-237, 2007-12-15 (Released:2011-02-09)

参考文献数

29

被引用文献数

3 8

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This study investigated the relation between personality characteristics and types of jaw deformities and evaluated the influence of orthognathic surgery on personality characteristics.The subjects consisted of 52 patients (16 males and 36 females) in whom jaw deformities were surgically corrected and the mean age at surgery was 26.3 years. They were divided into four groups based on the types of jaw deformities such as mandibular protrusion with or without maxillary retrusion, mandibular retrusion with or without maxillary protrusion, open bite and asymmetry.Personality characteristics were analyzed using Minnesota Multiple Personality Inventory (MMPI) and Rosenberg's Self-Esteem Scale before and six months after surgery, and the Kruskal Wallis test and t-test were used for statistical analyses.Preoperative MMPI scores were not significantly different from normal values of their generation as a whole, but the distribution of Depression Scale and Self-Esteem Scale scores among the four groups were significantly different. The Depression Scale score in the asymmetry group was higher than those in the other groups and the Self-Esteem Scale score in the asymmetry group was lower than those in the other groups. After surgery, the Depression Score decreased in the asymmetry group and the Self-Esteem Scale score increased in all groups except the open bite group.In conclusion, it is considered that patients with asymmetry are likely to have an inferiority complex and orthognathic surgery for such patients has a favorable effect on personality characteristics because the deformity and the change of full-face appearance are easily recognized by themselves.

著者

中村 麻里奈 櫻井 博理 菊地 憲明 飯野 光喜 五十嵐 一吉

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.8-16, 2017-04-15 (Released:2017-05-02)

参考文献数

21

被引用文献数

2

---

Treatment for cases with midface hypoplasia such as Apert syndrome and Crouzon syndrome should aim to achieve well-harmonized occlusion and maxillofacial morphology. To date, orthodontic treatments using Le Fort Ⅲ osteotomy concomitant with Le Fort Ⅰ or Ⅱ osteotomy have been reported. In this paper, we present a case with Apert syndrome treated by Le Fort Ⅲ distraction osteogenesis (LFⅢDO) followed by open rhinoplasty with iliac bone grafting and Le Fort Ⅰ osteotomy.The patient was a 16-year-old girl with Apert syndrome. She was characterized by severe midface hypoplasia representing skeletal Class Ⅲ occlusion with open bite. After the completion of preoperative orthodontic treatment, 12mm of midface advancement was performed by LF Ⅲ DO by using an internal distraction device. After the DO, although anterior open bite was slightly worse, midface hypoplasia and proptosis were significantly improved. Open rhinoplasty with iliac bone grafting was carried out 2 months after the LF Ⅲ DO. 5 months after the rhinoplasty, Le Fort Ⅰ osteotomy was performed to correct the anterior open bite.As a result, well-harmonized occlusion and maxillofacial morphology were achieved by close cooperation between the orthodontist, oral and maxillofacial surgeons and plastic surgeons.

著者

飯野 光喜 新津 恒太 中村 芳樹 大谷 宣夫 福田 雅幸

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.12, no.2, pp.77-83, 2002-08-15 (Released:2011-02-09)

参考文献数

14

被引用文献数

3 5

---

The aim of this article is to discuss the effectiveness of clockwise rotation of the occlusal plane for skeletal class III deformities with the use of two-jaw surgery.The most popular orthognathic surgical management for class III malocclusion is mandibular setback using a bilateral sagittal splitting ramus osteotomy (SSRO). However, it has been suggested that, with the aid of an operative method using SSRO alone, complete elimination of the protruded appearance in the mental region is hardly attainable, in some cases. To obtain better functional and esthetic results for patients with class M deformities, clockwise rotation of the occlusal plane, using two-jaw surgery, appears to be considerably useful surgical management. The changes provided by an increased occlusal plane angle include 1) advancement of the midface; 2) rotation of the chin posteriorly; 3) a decreased maxillary incisor angle; 4) an increased mandibular plane angle; 5) decreased posterior facial height. We emphasize that, by appropriate usage of clockwiserotation of the occlusal plane, more favorable functional and esthetic results for the correction of skeletal class deformity will be enabled in some cases.

著者

藤本 絢子 吉川 仁育 富永 憲俊 西村 眞 美馬 孝至 岡藤 範正

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.3, pp.183-189, 2017-08-15 (Released:2017-09-14)

参考文献数

16

被引用文献数

4

---

In the field of jaw deformities, there has been an increase in the number of middle-aged and elderly patients selecting surgical correction in recent years. However, treatment of these patients might be difficult because of poor oral condition such as edentulous jaws and tooth loss. Under these conditions, an interdisciplinary approach including orthodontics, oral surgery and prosthodontics is required for the treatment of jaw deformity. We report a patient with edentulous jaws who was treated with orthognathic surgery using the interdisciplinary approach.The patient was a 42-year-old male diagnosed with mandibular protrusion. He was at risk of chronic diseases of the mouth, including dental infection and tooth loss. As a result of diagnosis of prosthodontics, all teeth were extracted to correct severe oral hygiene. Before corrective jaw surgery, wax dentures were made on the assumption of post-surgery oral condition. By using the wax dentures, dental implants were positioned on the edentulous jaws and provisional teeth were made. Regarding orthognathic surgery, intraoral vertical ramus osteotomy was performed on the right side of the mandible and sagittal split ramus osteotomy was performed on the left side. Twelve months later, osteotomy was performed and the final stage of prosthodontic treatment was started.Following this interdisciplinary approach to jaw deformity treatment, the patient with edentulous jaws is satisfied with the stable occlusion and better facial contour.

著者

Diner Patrick A. A. Picard C. Tomat

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.23, no.2, pp.37-39, 2013

著者

吉田 憲司 松尾 直子 金子 道生 深谷 昌彦

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.4, no.1, pp.42-44, 1994-04-30 (Released:2011-02-09)

参考文献数

4

---

We developed the convenient measuring device of spine curvature from a lateral aspect to evaluate general symptoms of mandibular prognathism patients who apparently need surgical correction.The device enabled convenient measurement of the spine curvature of patients from a lateral aspect without affections the patients.

著者

竹山 雅規 森田 修一 山田 秀樹 武藤 祐一 齊藤 力 高木 律男 花田 晃治

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.13, no.3, pp.105-110, 2003-12-15 (Released:2011-02-09)

参考文献数

17

被引用文献数

1

---

This study investigated the soft tissue profile change of the chin following genioplasty. The subjects were 20 females who underwent genioplasty. They were divided into two groups depending on the directions of surgical displacement of the chin. In 11 patients anterior repositioning was made (forward movement group) and in 9 patients posterior repositioning was made (backward movement group).For each patient, lateral cephalograms taken preand postoperatively were traced and superimposed, and then linear measurements were obtained.The results were as follows: 1. There were differences in soft tissue reaction to hard tissue displacement between the forward movement group and backward movement group.2. In the forward movement group, the size of the chin increased as a result of further forward displacement of soft tissue pogonion in spite of forward displacement of lower labial sulcus. In the backward movement group, the size of the chin decreased as a result of backward displacement of soft tissue pogonion and forward displacement of lower labial sulcus.3. The horizontal displacement ratio of soft tissue pogonion to pogonion was 148% in the forward movement group, and 33% in the backward movement group.4. There was a significant positive correlation between the horizontal change of pogonion and soft tissue pogonion, horizontal change of menton and soft tissue menton, horizontal change of pogonion and the size of the chin, and horizontal change of menton and the size of the chin. On the other hand, in the forward movement group, there was no correlation between skeletal changes and soft tissue changes of the chin.