• Title/Summary/Keyword: class III elastics

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Camouflage treatment by backward rotation of the mandible for a severe skeletal Class III malocclusion with aplastic anemia: A case report

  • Choi, Dong-Soon;Lee, Dong-Hyun;Jang, Insan;Cha, Bong-Kuen
    • The korean journal of orthodontics
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    • v.52 no.5
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    • pp.362-371
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    • 2022
  • Orthognathic surgery is the primary treatment option for severe skeletal discrepancy. However, orthodontic camouflage should be considered as an alternative treatment option, considering the risks of surgery. A 19.5-yearold man presented with a severe prognathic mandible with a Class III molar relationship and an anterior crossbite. Orthognathic surgery could be considered because of his severe skeletal discrepancy and mandibular prognathism. However, the anesthetist for orthognathic surgery did not recommend surgery under general anesthesia because of risk factors associated with the patient's aplastic anemia, including bleeding and infections. Thus, a camouflage treatment to promote backward rotation of the mandible via orthodontic extrusion of the posterior teeth was planned. An anterior bite plate, intermaxillary elastics, and fixed orthodontic appliances were used to extrude the posterior teeth and to align the dentition. After 17 months of nonsurgical orthodontic treatment, normal occlusion was achieved, and the facial profile was dramatically improved. This case report describes the dentoskeletal and soft-tissue effects of mandibular rotation and its long-term stability.

CASE REPORTS OF ANGLE'S CLASS III MALOCCLUSIONS TREATED BY BIOPROGRESSIVE MECHANISM (Bioprogressive Mechanism에 의한 Cl III 부정교합의 치험예)

  • Chung, Kyu-Rim;Kwon, Ki-Youl
    • The korean journal of orthodontics
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    • v.15 no.2
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    • pp.353-368
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    • 1985
  • This present paper describes 3 clinical cases which were treated with Bioprogressive mechanism. Each patient has shown a deficient maxilla combined with prognathic and steep mandible. The purpose of treatment was planned to obtain the forward growth of maxilla and redirectioning of mandibular growth. The most noteworthy approach in the treatment was the application of Cl III intermaxillary elastics with upper protraction utility arch immediately after rapid maxillary expansion. In the analysis of the data obtained from pre- and post treatment lateral cephalogram, the result achieved by this method is very favolable to the correction of anteroposterior relationship of maxilla and mandible.

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

  • Chang, Young-Il;Rhee, Byung-Tae;Suh, Cheong-Hoon
    • The Journal of the Korean dental association
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    • v.17 no.5 s.120
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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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A CASE REPORT OF ORTHODONTIC TREATMENT OF LOWER PROGNATHISM (하악 전돌증 교정치험예)

  • Chang, Yong-Il;Lee, Ki-Soo;Suh, Cheong-Hoon
    • The Journal of the Korean dental association
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    • v.16 no.3 s.106
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    • pp.199-204
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    • 1978
  • The patient, 8 years female, complained of crossbite of anterior teeth and prognathism of mandible. There was lingual tipping of upper lateral incisor in teeth lining. Cephalometric analysis revealed normal in maxilla, but forward relation to standard, so daignosised as skeletal class III case. Crossbite of anterior teeth was corrected by means of CIII elastics under multibanded system. Space for eruption of canine was regained by means of E.O.A. After 2 years and 7 months, she gained good interdigitation of buccal segments of attractive facial profile.

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Anchor Plate Efficiency in Postoperative Orthodontic Treatment Following Orthognathic Surgery via Minimal Presurgical Orthodontic Treatment

  • Jeong, Tae-Min;Kim, Yoon-Ho;Song, Seung-Il
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.36 no.4
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    • pp.154-160
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    • 2014
  • Purpose: The efficiency of an anchor plate placed during orthognathic surgery via minimal presurgical orthodontic treatment was evaluated by analyzing the mandibular relapse rate and dental changes. Methods: The subjects included nine patients with Class III malocclusion who had bilateral sagittal split osteotomy at the Division of Oral and Maxillofacial Surgery, Department of Dentistry in Ajou University Hospital, after minimal presurgical orthodontic treatment. During orthognathic surgery, anchor plates were placed at both maxillary buttresses. The anchor plates were used to move maxillary teeth backward and for maximum anchorage of Class III elastics to minimize mandibular relapse during the postoperative orthodontic treatment. The lateral cephalometric X-ray was taken preoperatively (T0), postoperatively (T1), and one year after the surgery (T2). Seven measurements (distance from Pogonion to line Nasion-Nasion perpendicular [Pog-N Per.], angle of line B point-Nasion and Nasion-Sella [SNB], angle of line maxilla 1 root-maxilla 1 crown and Nasion-Sella [U1 to SN], distance from maxilla 1 crown to line A point-Nasion [U1 to NA], overbite, overjet, and interincisal angle) were taken. Measurements at T0 to T1 and T1 to T2 were compared and differences tested by standard statistical methods. Results: The mean skeletal change was posterior movement by $13.87{\pm}4.95mm$ based on pogonion from T0 to T1, and anterior movement by $1.54{\pm}2.18mm$ from T1 to T2, showing relapse of about 10.2%. There were significant changes from T0 to T1 for both Pog-N Per. and SNB (P<0.05). However, there were no statistically significant changes from T1 to T2 for both Pog-N Per. and SNB. U1 to NA that represents the anterior-posterior changes of maxillary incisor did not differ from T0 to T1, yet there was a significant change from T1 to T2 (P<0.05). Conclusion: This study found that the anchor plate minimizes mandibular relapse and moves the maxillary teeth backward during the postoperative orthodontic treatment. Thus, we conclude that the anchor plate is clinically very useful.

THE EFFECTS OF CHANCES OF MANDIBULAR POSITION ON TEMPOROMANDIBULAR JOINT IN ADULT RABBITS WHOSE RETRODISCAL TISSUES WERE INCISED (성숙가토의 관절원판후조직 절단 후 하악골의 위치변화가 악관절에 미치는 영향에 관한 연구)

  • Hwang, Hyeon-Shik;Sohn, Byung-Wha
    • The korean journal of orthodontics
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    • v.22 no.2 s.37
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    • pp.345-372
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    • 1992
  • The purpose of this experiment was to study the effects of changes of mandibular position on temporomandibular joint in internal derangement patients Twenty-four female New Zealand White Rabbits, weighing over 3.5kg, were utilized in this study . Bilateral temporomandibular joint surgery was performed in twenty-one of the rabbits to displace disc anteriorly through incising the retrodiscal tissue 1-2mm posterior to the disc, thus inducing internal derangement. They were divided into three groups nine were left untreated after surgery, six were fitted with functional protrusive appliances 4 weeks after surgery, and six wore collar appliances to apply 4 ounces of mandibular refractive force per side 4 weeks after surgery. The remaining three served as the control group. Histologic examinations were performed after sacrificing them by threes at 4-week intervals. The results were as follows. 1. Histologic findings similar to internal derangement were observed in the rabbits whose retrodiscal tissues had been incised. 2. In the rabbits untreated after surgery, articular surface on condylar process and articular eminence showed severe erosion and deformation, and displaced disc manifested changes in both shape and internal architecture. 3. Functional protrusion after surgery resulted in progressive remodeling on postero-superior portion of condyle and glenoid fossa, while it also brought about erosion on articular eminence and anterior portion of condyle. 4. Mandibular retraction after surgery resulted in compression of retrodiscal tissue and regressive remodeling of posterior portion of condyle.

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