| 摘要 |
<p>The material is in a flat sheet or strip form and has a thickness suitable for die working. The sheet has a pattern of substantially equally spaced indentations formed on the side which will become the inside or tooth-side of the band which are formed by metal displacement e.g. stamping, rolling etc. The indentations are either polygonally, diamond, cone or circular shaped. Independent claims are also claimed for: (1) A ring shaped blank for making a ring-shaped orthodontic band from a series of discs, (2) A seamless orthodontic band, (3) A method of making a metal seamless orthodontic ring blank from a circular blank.</p> |
