| 摘要 |
A grid tee and method of making the same comprising an elongated sheet metal strip folded on itself to integrally form a lower double wall flange, a hollow upper reinforcing bulb, and a web extending upwardly between the flange and bulb, the flange generally lying in a horizontal plane, having opposed spaced parallel edges extending longitudinally, and being perpendicular to the web, the web lying in a generally vertical plane, the strip having two longitudinal extending marginal edge zones, said marginal edge zones being generally vertically disposed and fixed at least at longitudinally spaced locations to a central area of the strip that forms a portion of the web and forming a double web layer area, the marginal edge zones of the strip being vertically spaced from one another such that a portion of the central area of the strip that forms a part of the web is a single exclusive layer. A grid tee and method of making the same comprising an elongated sheet metal strip folded on itself to integrally form a lower double wall flange, a hollow upper reinforcing bulb, and a web extending upwardly between the flange and bulb, the flange generally lying in a horizontal plane, having opposed spaced parallel edges extending longitudinally, and being perpendicular to the web, the web lying in a generally vertical plane, the strip having two longitudinal extending marginal edge zones, said marginal edge zones being generally vertically disposed and fixed at least at longitudinally spaced locations to a central area of the strip that forms a portion of the web and forming a double web layer area, the marginal edge zones of the strip being vertically spaced from one another such that a portion of the central area of the strip that forms a part of the web is a single exclusive layer. The invention provides systems for integrated haptic design and fabrication of dental restorations that provide significant advantages over traditional practice and existing computer- based systems. The systems feature technical advances that result in significantly more streamlined, versatile, and efficient design and fabrication of dental restorations. Among these technical advances are the introduction of voxel-based models; the use of a combination of geometric representations such as voxels and NURBS representations; the automatic identification of an initial preparation (prep) line and an initial path of insertion; the ability of a user to intuitively, haptically adjust the initial prep line and/or the initial path of insertion; the automatic identification of occlusions and draft angle conflicts (e.g., undercuts); the haptic simulation and/or marking of occlusions and draft angle conflicts; and coordination between design output and rapid prototyping/milling and/or investment casting. |
