Trans-sutural distraction osteogenesis for early correction of midfacial hypoplasia in children: a primary clinical report / 中华整形外科杂志

<p><b>OBJECTIVE</b>To probe the possibility of trans-sutural distraction osteogenesis for correction of children midfacial hypoplasia.</p><p><b>METHODS</b>The trans-sutural distraction system of mid-facial skeleton consisted of the bone-borne traction hooks of titanium, the face-bow, and the elastic loops. Nine children with midfacial hypoplasia were treated at their 6 - 12 years of age. No osteotomy was made in them. Bone holes were drilled with a dental bur at each side of the lateral-inferior rim of the aperture, or at the anterior part of the hard palate. The traction device was hatched to the holes through the nostrils. Protraction began 3 days postoperatively, with the forces adjusted dependently upon the rate of progress. When the skeleton reached to the planed position, it was retained with a minor force for 8 weeks.</p><p><b>RESULTS</b>The mid-facial skeleton of the nine children showed a balanced advancement. Their facial profile and cross-bite were corrected satisfactory.</p><p><b>CONCLUSIONS</b>Patients with severe mid-facial hypoplasia could be corrected ideally by the new technique, with minor trauma, easy manipulation. The design of protraction system was reasonable.</p>

Clinical significance of protein Z alteration in patients with cardio-cerebral thrombotic diseases / 中华血液学杂志

<p><b>OBJECTIVE</b>To study the alteration of protein Z (PZ) in patients with cardio-cerebral thrombotic diseases, its clinical significance and relations with FX.</p><p><b>METHODS</b>PZ and FX:Ag were measured by ELISA, and plasma FX:C by first stage method. In 170 patients with acute ischemic stroke (AIS), 40 acute myocardial infarction (AMI) and 60 healthy adults as contrast, PZ, FX:C and FX:Ag were measured and compared between incipience and recurrence, different ages and genders.</p><p><b>RESULTS</b>In AIS and AMI groups, PZ levels decreased significantly to (940.02 +/- 229.82) microg/L and (1071.44 +/- 180.52) microg/L, respectively \[the contrast group was (2257.97 +/- 479.76) microg/L, P < 0.001\]. But FX:C and FX:Ag raised to (136.73 +/- 34.93)% and (135.54 +/- 54.39)% in AIS group; and to (139.53 +/- 29.18)%, (129.75 +/- 21.91)% in AMI group, respectively, while in the contrast group they were (94.33 +/- 22.00)% and (77.22 +/- 13.19)% (P < 0.001). In the comparative research between the AIS group, AMI group and the contrast group, PZ level was clearly found to negatively relate to the level of FX:C and FX:Ag (P < 0.001). Meanwhile, PZ level, FX:C and FX:Ag in recur-AIS group and recur-AMI group exhibited significant differences (P < 0.05) from those in the primary AIS and AMI groups, suggesting that the decrease of PZ levels reflected the pathological process of the disease. In addition, PZ level gradually decreased with the increase of age (P < 0.05), while FX:C and FX:Ag had no relations with age (P > 0.05). No correlation was found in sex with PZ level, FX:C, FX:Ag (P > 0.05).</p><p><b>CONCLUSION</b>PZ level was significantly decreased in AIS and AMI patients and was negatively related to FX:C and FX:Ag. The mechanism leading to FX increase may partially related with the decreased of PZ. PZ level was different in the primary and recurrent disease and was gradually decreased with the increase of age. Lack of PZ might be a etiological factor of cardio-cerebral thrombotic diseases.</p>

Le Fort III osteotomy and medium position distraction for mid-facial hypoplasia / 中华整形外科杂志

<p><b>OBJECTIVE</b>To probe the possibility of distraction osteogenesis for correction of mid-facial hypplasia using a new technique.</p><p><b>METHODS</b>The distraction system of mid-facial skeleton consisted of a face-bow, the elastic loops and a device that hitched to bone holes made in the aperture rim. Flllowing Le Fort III osteotomy, a bone hole was drilled at each side of the external-inferior rim of the aperture by a dental bur. The traction device was hitched to the holes through the nostrils. Distraction began three days postoperatively, with the force adjusted dependently upon the rate of progress. When the skeleton reached to the planed position, distraction was retained with a minor force for 8 weeks. Three adults with mid-facial hypoplasia underwent this treatment.</p><p><b>RESULTS</b>The mid-facial skeleton showed a balanced advancement. The patients' facial contour and occlusal relationship recovered completely.</p><p><b>CONCLUSIONS</b>Patients with severe mid-facial hypoplasia could be corrected ideally by the new technique, with balanced advancement of mid-facial skeleton, minor trauma. The design of distraction system was reasonable. The manipulation of the procedure was easy.</p>

Using TiNi-SMA distractor for mandibular alveolar ridge augmentation by distraction osteogenesis: a preliminary study / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study the possibility of mandibular alveolar ridge augmentation by distraction osteogenesis using TiNi-SMA (shape memory alloy) distractor.</p><p><b>METHODS</b>All of the mandibular premolars and the first molar were extracted from ten adult mongrel canines. One month later, box-shaped osteotomies of the alveolar bone were performed out and TiNi-SMA distractors were buried in experimental group. The bone height was measured before and 1, 5, 13 weeks after the operation. The radiographs were taken on the day of, and 1, 5, 13 weeks after operation. The animals were killed at one or three months after distraction and examined histologically.</p><p><b>RESULTS</b>The bone segments were lifted up immediately after the insertion of distractors and the height achieved 7.5 - 11.5 mm one week after the operation. One month after distraction, the radiographs showed there was regeneration of bone in distraction gap. The new bone and the normal bone could not be differentiated clearly three months after distraction. No bone resorption was found during this period. In histological sections, there were collagen bundles in early distraction, then these bundles were calcified and became traeculaes.</p><p><b>CONCLUSION</b>It suggests that the canine mandibular posterior alveolar ridge can be augmented by distraction osteogenesis using TiNi-SMA distractor, and the new bone is formed by intramembranous ossification.</p>