Management of complicated midface deficiencies with external distraction / 中华整形外科杂志

<p><b>OBJECTIVE</b>To treat complicated midface deficiencies with external distraction device.</p><p><b>METHODS</b>Four patients (one with acquired midface hypoplasia, two with Crouzon syndrome and one with Parry Romberg) with severe midface deficiencies underwent external distraction osteogenesis. After Le Fort III or Le Fort III plus I osteotomies were performed, the external distraction devices were activated on the 7th postoperative day with a rate of 1 mm per day. The distraction devices were removed after consolidation for 3 months.</p><p><b>RESULTS</b>All patients completed the distraction treatment. The distraction distance ranged from 10 to 14 mm. The appearance of all patients was significantly improved.</p><p><b>CONCLUSIONS</b>External distraction osteogenesis provides an effectively treatment for patients with severe and complicated midface deficiencies.</p>

A histological study of three-dimensional external zygomatic suture distraction osteogenesis / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To explore the histological change in suture of zygomatic bone for the zygomatic suture direct distraction osteogenesis.</p><p><b>METHODS</b>The zygomatic bone was distracted by 3-D external distraction appliance without osteotomy. The specimens were taken 1, 3, 5 and 8 weeks after, and then examined histologically and compared with the blank contralateral side.</p><p><b>RESULTS</b>There were lots of fibroblasts, osteoblasts and capillary vessels in the distracted suture tissues one week after distraction, and the fibers were observed to connect the sides of suture and arranged orderly. The surfaces of the expanded suture were irregular. Bone formation was active in the expanded side. The bone trabeculae were mature and oriented in the direction of distraction in the distracted sides at 3 weeks. A great amount of new woven bones were found in 5-week specimen. New bones were formed completely 8 weeks after the distraction.</p><p><b>CONCLUSIONS</b>New bone formed rapidly in the distracted side of zygomatic bone under suture distraction osteogenesis without osteotomy.</p>

Reconstruction correction to Reconstrction of mandibular bone defects by using the techniques correction to teachniques of the reverse engineering and rapid prototyping / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the feasibility of designing and fabricating customized titanium bone substitutes to restore mandibular bone defects using reverse engineering (RE) and rapid prototyping (RP) techniques.</p><p><b>METHODS</b>Titanium tray for mandibular defects were designed and fabricated through multi-step procedures of reverse engineering and rapid prototyping, then in operation it was filled with cancellous bone and fixed.</p><p><b>RESULTS</b>The bone substitutes fabricated by this method had been successfully put into clinical use for maxillofacial surgery in 2 patients and got a satisfactory result.</p><p><b>CONCLUSIONS</b>Reverse engineering combining with rapid prototyping could accomplish the design and manufacture of implant for the restoration of mandibular bone defects.</p>

Surgical orthodontic technique for the treatment of maxillofacial deformities and dysfunction of occlusion after maxillofacial fractures / 中华整形外科杂志

<p><b>OBJECTIVE</b>To evaluate a new technique to treat severe maxillofacial deformity and dysfunction of occlusion after the maxillofacial fractures.</p><p><b>METHODS</b>Thirty-four consecutive patients, with delayed maxillofacial deformities and dysfunction of occlusion after the maxillofacial fractures, were treated by the use of x-ray cephalometric analysis, model surgery, open reduction and rigid internal fixation.</p><p><b>RESULTS</b>Thirty-three patients were successfully corrected the maxillofacial deformities, facilitated normal occlusal relationship. Only one patient with severe damage of the brain was presented a mild occlusion dysfunction one year after the operation.</p><p><b>CONCLUSIONS</b>The above-mentioned technique may be a viable and effective option for the management of the deformities of the face and dentition after the maxillofacial fractures.</p>

An experimental study of 3-dimension zygomatic suture extension for suture osteogenesis / 中华整形外科杂志

<p><b>OBJECTIVE</b>To explore a methods of 3-Dimension expansion of zygomatic suture in a goat model.</p><p><b>METHODS</b>Seven goats were used in this study. The 3-D extensive applicator was designed and used to extend the zygomatic suture of the goats by placing it in the zygomatic bone through an infraorbital incision. Ten days after the first operation, it was gradually extended on a speed of 0.09 cm/d for 7 days. The zygomatic movement and the osteogenesis of the suture was evaluated in two weeks.</p><p><b>RESULTS</b>The zygomatic bone was extended for 0.6 cm long in average, and the osteogenesis was also shown significantly in the suture.</p><p><b>CONCLUSION</b>The above mentioned technique could be a safe and effect method to be applied for the zygomatic extension.</p>