Intraoral mandibular distraction osteogenesis in facial asymmetry patients with unilateral temporomandibular joint bony ankylosis
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1 Int. J. Oral Maxillofac. Surg. 2002; 31: doi: /ijom , available online at on Intraoral mandibular distraction osteogenesis in facial asymmetry patients with unilateral temporomandibular joint bony ankylosis Technical Note Craniofacial Deformities H.-J. Yoon 1, H.-G. Kim 2 1 Department of Oral and Maxillofacial Surgery, St Mary s Hospital, Catholic University of Korea; 2 Department of Oral and Maxillofacial Surgery, Youngdong Severance Hospital, Yonsei University, Seoul, South Korea H.-J. Yoon, H.-G. Kim: Intraoral mandibular distraction osteogenesis in facial asymmetry patients with unilateral temporomandibular joint bony ankylosis. Int. J. Oral Maxillofac. Surg. 2002; 31: International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Science Ltd. All rights reserved. Abstract. Gap arthroplasty and costochondral rib bone graft are commonly performed by oral and maxillofacial surgeons to reconstruct the temporomandibular joint with ankylosis. However, unpredictable and unsatisfactory results such as re-ankylosis, growth disturbance, and facial asymmetry often occur. Even if the costochondral graft is successful, donor-site morbidity is inevitable. More recently, surgeons have become interested in distraction osteogenesis as a means of temporomandibular joint reconstruction. This case series presents the results of intraoral mandibular distraction osteogenesis and gap arthroplasty in two patients with facial asymmetry and unilateral temporomandibular joint bony ankylosis. Both patients had experienced failed gap arthroplasty and costochondral graft for the reconstruction of the temporomandibular joint. Distraction osteogenesis with gap arthroplasty proved successful in these two patients with follow-up of longer than 2 years. Key words: mandibular distraction; TMJ ankylosis. Accepted for publication 25 April 2002 Distraction osteogenesis is a very attractive technique and has been applied for the treatment of craniofacial microsomia, developmental micrognathia, Treacher Collins syndrome, Nager s syndrome, craniofacial synostosis syndrome and Pierre Robin syndrome, transverse mandibular deficiency 9. More recently, distraction osteogenesis has been proposed for the treatment of bony ankylosis of the temporomandibular joint. 3,10 In this case report, the long-term results of two cases treated by intraoral mandibular distraction osteogenesis and gap arthroplasty for facial asymmetry and unilateral temporomandibular joint bony ankylosis is described. Case reports (1) Case I A 13-year-old girl was admitted for a limitation of mouth opening and facial asymmetry. At 4 years of age she had suffered trauma of the right TMJ and her mouth opening had become gradually limited. Gap arthroplasty surgery was performed twice at other hospitals. Clinical examination showed chin deviation to the right, retrognathic mandible, maxillary cant, deviation of the mandibular dental midline to the right and a 4 mm overjet (Fig. 1A, B). Mouth opening was reduced to 8 mm. Radiographic examination showed an irregularly shaped right condylar head with bony ankylosis and short rami (Fig. 2A, B). Under general anaesthesia, coronoidectomy was performed, but her mouth /02/ $35.00/ International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Science Ltd. All rights reserved.
2 distractor was removed 8 weeks after completing the distraction. During the entire distraction process, the patient performed active mouth opening exercises and received a tolerable diet. No complications occurred over a clinical follow-up period of 25 months. At which time the patient had a more favourable facial appearance and a mouth opening of 33 mm (Fig. 4A, B, and C, Fig. 9A, B). (2) Case II Fig. 1. A and B. Preoperative facial photographs showing chin deviation to the right, a retrognathic mandible, and maxillary canting. Fig. 2. A. Maximum mouth opening preoperatively, B. 3D CT shows an irregularly shaped right condylar head with bony ankylosis and short rami. A 31-year-old woman presented with the complaint of limited mouth opening and an asymmetric face. At age 2 years, she had suffered right TMJ trauma. Over the years, she had undergone several operations at other hospitals, including, orthognathic surgery (twice), costochondral rib bone graft (3 times), and gap arthroplasty (once), to correct her deformities. Physical examination revealed facial asymmetry with chin point deviation to the right, maxillary cant, retrognathic mandible, scars from previous operations (Fig. 5A, and B), malocclusion, severe overjet (6 mm) and a maximum interincisal opening at 15 mm. Radiographic evaluations revealed bony ankylosis of the costochondral graft (inferior portion) with the glenoid fossa and the coronoid process (Fig. 6A, B, and C). Coronoidectomy and resectioning of the middle and superior portion of costochondral graft were performed under general anaesthesia, but mouth opening did not increase. A further operation was then performed as described for Case I. Accordingly, the patient had a postoperative interincisal opening of opening was not increased. Condylectomy and gap arthroplasty were undertaken on the right TMJ using a preauricular and Risdon approach. A preplanned corticotomy was performed in the lateral cortex, extending from the external oblique ridge to the angle of the right mandible. An intraoral distractor (Medicon, Tuttlingen) was placed across the corticotomy and fixed, and the osteotomy then completed. Special care was taken to place the distractor parallel to the vector of growth needed. At the end of surgery, the patient had a mouth opening of 35 mm. Following a latency of 5 days, the intraoral distractor was activated at a rate of 0 8 mm per day or 1.2 mm per day on alternating days for 16 consecutive days (Fig. 3A, B). The Fig. 3. A and B. Cephalometric and panoramic radiograph at the completion of distraction (a white line: the osteotomy line in the distal segment, a dotted line: the osteotomy line in the proximal segment).
3 546 Yoon and Kim and at that time the patient had a maximum mouth opening of 42 mm (Fig. 8A, B, and C, Fig. 10A, B). Fig. 4. A, B, and C. Showing a more favourable facial appearance and a mouth opening of 33 mm. Twenty-five months postoperatively. Fig. 5. A and B. Preoperative facial photographs showing facial asymmetry, with a chin point deviation to the right, maxillary cant, retrognathic mandible, and the scars caused by previous operations. 32 mm, and after a latency period of 8 days, the distraction device was activated for a period of 9 days at the same alternating rates as described for Case I (Fig. 7A, B). Class II elastics were used 22 h a day on the affected side and a neutral elastic on the other side. The distractor was removed 6 months after completing the distraction. The patient had longer latency and consolidation periods than in Case I, because of poor bone quality and quantity at the osteotomy site during surgery. One and a half years later, orthognathic surgery (Lefort I osteotomy, SSRO:Lt., IVRO:Rt.) was performed to treat the maxillary cant and the gummy smile. Total clinical follow-up was 34 months Discussion Patients with bony TMJ ankylosis have various functional and aesthetic facial deformities. Moreover, the earlier the bony ankylosis process starts, the worse these deformities become later: retrognathic mandible, chin deviation towards the affected side, limitation of mandibular movement, facial muscle atrophy and occlusal plane cant. The main goals of treatment are successful surgical resection of the ankylosis, the prevention of its recurrence and the re-establishment of a harmonious jaw relationship and functional occlusion. Ankylosis release and costochondral graft reconstruction continue to be used as the standard procedures to treat TMJ ankylosis. However, costochondral grafts in children are often associated with problems, such as, excessive and unpredictable growth or the necrosis and resorption of the costochondral graft. 4 6 Another common problem is that the costochondral graft does not release the tension caused by the atrophic facial muscle against the graft. Because of these shortcomings, oral and maxillofacial surgeons have become interested in gap arthroplasty and distraction osteogenesis for the treatment of temporomandibular joint ankylosis. 3,10 Distraction osteogenesis can shorten the admission and operation time, the risk of surgery, and the possibility of relapse. 8 Above all, the direction and amount of bony lengthening can be controlled, and soft tissue as well as hard tissue can be lengthened. 7 The cutaneous scars produced by the extraoral distraction of mandibular pins are always conspicuous and are often hypertrophic. 1,11 In the two cases presented here, an intraoral distractor was used to avoid this problem, and oblique device placement was applied to increase the vertical and horizontal dimensions of the ramus and the body. 2 The two patients described here, treated by gap arthroplasty and distraction osteogenesis, showed favourable results in terms of function and aesthetics during the follow up period of 2 years. Although more experience and long-term follow-up are needed, it is concluded that distraction osteogenesis can be useful for the resolution of bony ankylosis of the temporomandibular joint.
4 Intraoral mandibular distraction osteogenesis in facial asymmetry patients 547 Fig. 6. A, B, and C. Radiographic evaluations showing lateral bony ankylosis of the costochondral graft with a glenoid fossa and coronoid process. Fig. 9. A and B. Cephalometric and panoramic radiograph. Twenty-five months postoperatively. Fig. 7. A and B. Cephalometric and panoramic radiograph at the completion of distraction (a white line: the osteotomy line in the distal segment, a dotted line: the osteotomy line in the proximal segment). Fig. 8. A, B, and C. Lateral and frontal facial appearance of the patient with a mouth opening of 42 mm. Thirty-four months postoperatively. Fig. 10. A and B. Cephalometric and panoramic radiograph. Thirty-four months postoperatively.
5 548 Yoon and Kim References 1. DINER PA, KOLLAR EM, MARTINEZ H, et al. Intraoral distraction for mandibular lengthening: a technical innovation. Journal of Cranio-Maxillofacial Surgery 1996: 24: GRAYSON BH, SANTIAGO PE. Treatment planning and biomechanics of distraction osteogenesis from an orthodontic perspective. Seminar in Orthodontics 1999: 5: GUERRERO CA, PASTEUR BS, BELL WH. Combined temporo-mandibular joint ankylosis release with mandibular lengthening via distraction osteogenesis. International Congree on Cranial and Facial Bone Distraction Porcesses GUYURON B, LASA CI. Unpredictable growth pattern of costochondral graft. Plast Reconstr Surg 1992: 90: KO EWC, HUANG CS. Temporomandibular joint reconstruction in children using costochondral grafts. J Oral Maxillofac Surg 1999: 57: MACINTOSH RB. Costochondral Grafting. In: Bell WH, ed.: Modern Practice in Orthognathic and Reconstructive Surgery, Vol 2. Saunders 1992: MCCARTHY JG, SCHREIBER J, KARP N, et al. Lengthening the human mandible by gradual distraction. 1993:92: Plast Reconstr Surg 1992: 89: MCCARTHY JG, STELNICKI EJ, GRAYSON BH. Distraction osteogenesis of the mandible: A Ten-Year Experience. Seminar in Orthodontics 1999: 5: NIEDERHAGEN B, BRAUMANN B, BERGE S, et al. Tooth-borne distraction to widen the mandible. Int J Oral Maxillofac Surg 2000: 29: PAPAGEORGE MB, APOSTOLIDIS C. Simultaneous mandibular distraction and arthroplasty in a patient with temporomandibular joint ankylosis and mandibular hypoplasia. J Oral Maxillofac Surg 1999: 57: VAN STRIJEN PJ, PERDIJK FBT, BECKING AG, et al. Distraction osteogenesis for mandibular advancement. Int J Oral Maxillofac Surg 2000: 29: Address: Hyun-Joong Yoon Department of Oral and Maxillofacial Surgery St Mary s Hospital Catholic University of Korea #62 Yoido-Dong Youngdungpo-Ku Seoul South Korea
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