Salyer K E, Johns D F, Holmes R E, Layton J G
J Biomed Mater Res. 1977 Jul;11(4):461-70. doi: 10.1002/jbm.820110402.
Between 1960 and 1972, the Dallas Veterans Administration Hospital Maxillofacial Research Laboratory developed and made over 150 cast-mesh implants. Successive designs were ovoid, circular, and double-lumened in cross section to improve implant strength, surface area for bioattachment, and adjustability. Sleeves, collars, and bows were employed in the assembly of these implants, with an acrylic condylar head attached when indicated. In 1972, our laboratory developed a mandibular mesh tray, cast in one piece on a single sprue, with preservation of the vertically adjustable ramus. Stainless steel replaced Vitallium because of its greater malleability. Essentially, a lost-wax technique is used to cast the mesh tray. The model of a mandibular segment is duplicated as a refractory model. Mesh wax, made in our own custom-made die, is adapted to the refractory model. The unit is then sprued and invested. The wax is fired our of the mold in a gas furnace. Casting is done by the transferral of molten stainless steel from the crucible to the mold by centrifugal force in an electro-induction casting machine. Other mesh implants that have been developed are made from wire mesh, Dacron mesh, cast Ticonium, and hydroformed titanium.
1960年至1972年间，达拉斯退伍军人管理局医院颌面研究实验室研发并制作了150多个铸网植入物。后续设计的植入物横截面呈卵形、圆形和双腔形，以提高植入物强度、生物附着表面积和可调节性。这些植入物的组装采用了套管、颈圈和弓形结构，必要时还会附上丙烯酸髁头。1972年，我们实验室研发了一种下颌网板，它通过单浇道整体铸造而成，保留了可垂直调节的升支。由于不锈钢的延展性更强，因此取代了钒合金。基本上，采用失蜡法铸造网板。下颌骨节段模型被复制成耐火模型。用我们自己定制模具制作的网蜡贴合耐火模型。然后对该部件进行浇道制作和包埋。在燃气炉中把蜡从模具中烧掉。通过电动感应铸造机利用离心力将熔化的不锈钢从坩埚转移到模具中进行铸造。已研发的其他网植入物由金属丝网、涤纶网、铸造钛和液压成型钛制成。
