• 제목/요약/키워드: Mandibular Retrusion

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상악후퇴증 및 하악전돌증의 악교정수술예 (A Case Report of Maxillary Retrusion and Mandibular Protrusion Corrected by Simultaneous Maxillary and Mandibular Osteotomies)

  • 김재승
    • 대한치과의사협회지
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    • 제23권11호통권198호
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    • pp.979-986
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    • 1985
  • This is a case report of orthognathic surgery for the correction of maxillary retrusion and mandibular protrusion. The summary and results are as follows, 1. The maxillary retrusion was corrected by LeFort I osteotomy. 2. The mandibular protrusion was corrected by sagittal split osteotomies in the rami. 3. And, for the correction of the discrepancy between max8llary and mandibular arches, the mandibular arch was widened by the midsymphyseal step osteotomy. 4. The ratios of horizontal changes of soft tissue to hard tissue at the points, Subnasale (Sn), Labrale superius (Ls), Labrale inferius (L9), and Supramentale (B) were 67.6%, 43.2$, 70.2% and 87.7%, respectively.

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하악골 후퇴증의 외과적 치험례 (A Case Report of a Surgical Correction of the Mandibular Retrusion)

  • 임난희;박진호;진병로;이희경
    • Journal of Yeungnam Medical Science
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    • 제12권2호
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    • pp.393-399
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    • 1995
  • 심한 하악 후퇴증은 교정치료만으로 성공적인 결과를 얻을 수 없으며 골절단술, 이부성형술등 외과적 교정이 고려되어야 한다. 설골상근의 장력에 의한 회귀현상을 최소화하기 위해 수술시 하악 체부를 전방회전시킴과 동시에 가능한 전방으로 overcorrection한다. 저자등은 구미인에 비해 발생빈도가 적은 하악 후퇴증을 주소로 내원한 환자를 양측성 하악골 시상절단술과 이부 성형술을 통하여 만족할만한 안모개선 및 교합관계 개선을 이루었기에 이에 보고하는 바이다.

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Three-dimensional analysis of the positional relationship between the dentition and basal bone region in patients with skeletal Class I and Class II malocclusion with mandibular retrusion

  • Jun Wan;Xi Wen;Jing Geng;Yan Gu
    • 대한치과교정학회지
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    • 제54권3호
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    • pp.171-184
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    • 2024
  • Objective: This study aimed to determine the maxillary and mandibular basal bone regions and explore the three-dimensional positional relationship between the dentition and basal bone regions in patients with skeletal Class I and Class II malocclusions with mandibular retrusion. Methods: Eighty patients (40 each with Class I and Class II malocclusion) were enrolled. Maxillary and mandibular basal bone regions were determined using cone-beam computed tomography images. To measure the relationship between the dentition and basal bone region, the root position and root inclination were calculated using the coordinates of specific fixed points by a computer program written in Python. Results: In the Class II group, the mandibular anterior teeth inclined more labially (P < 0.05), with their apices positioned closer to the external boundary. The apex of the maxillary anterior root was positioned closer to the external boundary in both groups. Considering the molar region, the maxillary first molars tended to be more lingually inclined in females (P = 0.037), whereas the mandibular first molars were significantly more labially inclined in the Class II group (P < 0.05). Conclusions: Mandibular anterior teeth in Class II malocclusion exhibit a compensatory labial inclination trend with the crown and apex relative to the basal bone region when mandibular retrusion occurs. Moreover, as the root apices of the maxillary anterior teeth are much closer to the labial side in Class I and Class II malocclusion, the range of movement at the root apex should be limited to avoid extensive labial movement.

악관절(顎關節)의 이완성(弛緩性)(LAXITY)에 관(關)한 연구(硏究) (A STUDY ON THE LAXITY OF THE TEMPOROMANDIBULAR JOINTS)

  • 윤창근;마장선
    • 대한치과보철학회지
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    • 제20권1호
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    • pp.51-66
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    • 1982
  • The purpose of this study was primarily to determine the relationship between temporomandibular joint mobility and generalized benign joint hypermobility. The subjects were 85 men and 76 women, who were students of dental and dental hygiene schools, aged 18 to 30 years old. They had no disturbances or complaints of movement of temporomandibular joints and other joints in the body. The joint mobility was measured by a test which is a modification of a method developed originally by Carter and Wilkinson (1964). The mandibular mobility was measured during active and passive maximal opening, laterotrusion, protrusion, and retrusion by Ingervall's method (1970). The obtained results were as follows: 1. The distribution of joint hypermobility disclosed was 4.8% in men and 19.7% in women, and 11.8% of total subjects. 2. The joint mobility index was a mean of 0.37 for men and 0.51 for women in total subjects, and 0.80 for men and 0.73 for women in hypermobile subjects. 3. The angle of passive dorsiflexion of the little finger was greater in the left than in the right hand for both sexes and in hypermobile subjects than in total subjects. 4. There was a positive correlation between the joint mobility index and the angle of passive dorsiflexion of the little finger in total subjects. 5. The joint mobility was greater in women than in men, and in the left than in the right hand. 6. In the active maximal mandibular movements of total subjects, the mean values for the opening capacity was 56.01 mm and 52.04mm, the laterotrusion mean 8.07 and 8.08, the protrusion mean 8.72 and 8.24, and the retrusion mean 0.48 and 0.49 for men and women respectively. 7. In the passive maximal mandibular movements of total subjects, the mean values for the opening capacity was 59.07mm and 54.85mm, the laterotrusion mean 8.90 and 9.12, the protrusion mean 10.03 and 10.00, and the retrusion mean 0.69 and 0.72 in men and women respectively. The active and passive maximal opening capacity was larger in men than in women but in the other movements there were no significant differences between men and women. 8. The range of active and passive maximal mandibular movements of hypermobile subjects tended to be larger in men but no significant difference in women compared with that of total subjects. 9. The range of maximal mandibular movements was increased more in passive than in active.

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성장기 하악전돌 환자에서 TTBA를 이용한 교정치료:증례보고 (The orthopedic correction of mandibular protrusion with TTBA growing patients: Report of two cases)

  • 김병천;문철현
    • 대한치과의사협회지
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    • 제41권10호통권413호
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    • pp.720-727
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    • 2003
  • Clinicians generally agree that Class III malocclusion is one of the most difficult to treat. When the Class III malocclusion is characterized by maxillary retrusion in growing patients, the use of a face mask may be the treatment of choice. Although face mask can achieve excellent orthopedic effects. It demands special patient compliance because it is worn extraorally and is not as esthetic or comfortable as intraoral appliance. This report presents the clinical cases of mandibular protrusion correction in growing patients, who were treated by TTBA(Tandem Traction Bow Appliance) that's a intraoral appliance.

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악관절 폐구성 과두걸림 환자의 하악운동에 관한 연구 (A Study on the Mandibular Movements in the Patients with TMJ Lock Closed)

  • Ji-Won Lee;Sung-Chang Chung
    • Journal of Oral Medicine and Pain
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    • 제15권1호
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    • pp.79-89
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    • 1991
  • The author examined the patterns and various ranges of mandibular movements in TMJ lock closed patients in the frontal, sagittal and horizontal plane and obtained the following results. 1. In the frontal trajectory, the mean amount of maximum mouth opening was 24.4mm and the opening paths were deviated to the affected side in 87.1% of the patients. The mean amount of maximum laterotrusion to the affected side was 10.4mm and that of non-affected side was 7.5mm. There was a significant difference between them(p<0.001). 2. In the sagittal trajectory, the mean amount of the maximum protrusion was 7.0mm, the mean amount of the maximal retrusion was 1.0mm 3. In the horizontal trajectory, the pattern of laterotrusion showed asymmetry: the mean length of non-affected side was smaller than that of the affected side. Protrusive path were deviated to the affected side in 64.5% of the patients, the mean degree of deviation was 16.4$^{\circ}$. The mandibular movements of TMJ lock-closed patients can be characterized by decreased range of mouth opening, protrusive movement, and laterotrusive movement to the non-affected side and also characterized by deviated opening and protrusive path to the affected side.

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Reverse Occlusion의 교정치험례 (A Case Report of Orthodontic Treatment of Reverse Occlusion)

  • 장영일;이병태;서정훈
    • 대한치과의사협회지
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    • 제17권5호통권120호
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    • pp.345-350
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    • 1979
  • The patient, 16 years female, complained of anterior cross-bite and retrusion of maxilla. Mandibular incisors occluded labially to maxillary incisors. Normally developed mandibular arch in normal elation to facial line, S-N-Pog was within normal range. Cross-bite of anterior teeth was corrected by means of Class III elastics under multibanded system. Space for alignment of crowding of upper anterior teeth was regained by means of cervical headgear and sliding yoke. She gained good alignment of anterior teeth and attractive facial profile after 2 years.

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반안면 왜소증 환자에서의 골신장술 (DISTRACTION OSTEOGENESIS IN PATIENTS WITH HEMIFACIAL MICROSOMIA)

  • 백진아
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제31권6호
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    • pp.526-531
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    • 2005
  • Distraction osteogenesis is a technique of bone lengthening by gradual movement and subsequent remodeling. Distraction forces applied to bone also create tension in the surrounding soft tissues, distraction histiogenesis. Distraction osteogenesis is used to correct facial asymmetry, such as patients with hemifacial microsomia, maxillary or mandibular retrusion, cleft lip & palate, alveolar defect and craniofacial deficiency. Hemifacial microsomia is characterized by unilateral facial hypoplasia, often with unilateral shortening of the mandible and subsequent malocclusion. This report describes two cases of hemifacial microsomia(type IIB). In these two cases, distraction osteogenesis was used to correct a facial asymmetry. Two patients underwent unilateral mandibular distraction osteogenesis of ascending ramus of the mandible with extraoral devices. Successful distraction osteogenesis was achieved in the patients with hemifacial microsomia.

교합 피개 심도와 과두 위치 (THE RELATIONSHIP OF MANDIBULAR CONDYLAR POSITION TO OVERBITE DEPTH)

  • 손영화;장영일
    • 대한치과교정학회지
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    • 제21권2호
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    • pp.399-418
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    • 1991
  • This study was designed to evaluate the relationship of mandibular condylar position to overbite depth and compare the findings from transcranial radiographs and those, from individualized corrected tomographs in determination of condylar position. The subjects consisted of 20 control subjects (male 8, female 12), and 10 open-bite patients (male 3, female 7) and 23 deep-bite patients (male 17, female 6). The mean age was 23.3 years for the control group, 21.5 years for open-bite group, and 23.2 years for deep-bite group. Transcranial radiographys and individualized corrected tomographys in centric occlusion were taken from right and left temporomandibular joints of each sueject. The results were as follows. 1. In the 20 normal subjects showing no symptoms of TM disorder, the incidence of condylar retrusion was $27.5\%$, middle condylar position $60.0\%$, and anterior displacement $12.5\%$. 2. There was significant correlation between the bite depth and observed condylar position. 3. Only $45.2\%$ of the findings from transcranial radiographs coincided with those from individualized corrected tomographs in determining condylar position.

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골격성 3급 부정교합자의 악교정 수술 후 설골 위치와 상기도 크기의 변화 (CHANGES OF THE HYOID BONE POSITION AND THE UPPER AIRWAY DIMENSION AFTER ORTHOGNATHIC SURGERY IN SKELETAL CLASS III PATIENTS)

  • 김지용;안제영;임재형;허종기;박광호
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제28권1호
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    • pp.27-34
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    • 2006
  • After orthognathic surgery in skeletal class III patients, the hyoid bone position and the upper airway dimension could be changed due to mandibular setback. There has been many studies about airway dimension of the patients with skeletal class II malocclusion or obstructive sleep apnea. but not with skeletal class III. The purpose of this study was to examine the change of position of the hyoid bone and the consequent change of airway space as the result of retrusion of mandible after orthognathic surgery in skeletal Cl III malocclusion patients. It is also to apply this results in predicting, diagnosing and treating the subsequent obstructive sleep apnea. Forty patients who were diagnosed as skeletal Cl III maloccusion, received orthoganthic surgery of both jaws including mandibular setback, and were followed up post-operatively for more than 6 months were selected. There were 10 male patients 30 female patients. The preoperative and postoperative lateral cephalograms were traced and the distances and angles were measured. The nasopharyngeal space increased postoperatively while the oropharyngeal space decreased. Except for the change of oroparyngeal space, the changes in male patients were greater than female patients. The hyoid bone moved in the posterior-inferior direction, and the change was greater in males than in females. If the postoperative mandibular setback is great, then a significant decrease of airway space and posterior and inferior movement of the hyoid bone were observed. This can result in symptoms related to obstructive sleep apnea. This result should be considered in the diagnosis and treatment planning of orthognathic surgery patients.