Résumé
Objective:To evaluate the contour and functional restoration in segmental defects of mandibles with three-dimensional CT(3D-CT) reconstrction.Methods: Twenty-four patients(16 males,8 females) underwent mandibular reconstruction by using nonvascularized bone grafts.In 24 patients,nonvascularized grafts from the iliac crests(n=11),the ribs(n=10),and the autogenous mandibular bones(AMB)(n=3)were used.`The length of segmental bone grafts ranged from 6 to 20 cm,with an average of 9.8 cm,for the defects with 5 to 20 cm.Both contour and functional effects with reconstructed mandible were determined and analysed via 3D-CT.Results: All free bone grafts were successfully healed.Among them,17 patients showed better soft tissue contour.Only 14 patients were satisfied for skeletal contour.All patients could wear a conventional denture after reconstruction.Conclusion:Facial contour can be achieved via mandibular reconstruction with iliac,rib and AMB.3D-CT can provide anatomy position for the surgical planning.It is an important mean to compensate inadequate of general X-ray and convention CT.Meanwhile it can be used for estimating the reconstruction effects while follow-up.
Résumé
The morphogenesis of Valsalva's sinus of semilunar valves in chick embryo was studied with SEM and LM. The sinus began to develop at stage 30 and was basically formed at stage 34 (based on H-H staging). The endothelial cells on arterial and ventricular surfaces of the valve were morphologically different. Mesenchymal cells beneath the endothelium were distributed loosely or densely on different parts of the valve in accordance with the morphological changes of the endothelial cells. The study suggests that the formation of the sinus is associated with not only the growth of endothelial cells on the arterial surface of the valve into underneath mesenchyme, but also with the mesenchyme which is loosing and presents some cavities.