当前申请(专利权)人地址：
Sonnenstraße 90, Düsseldorf 40227, North Rhine- Westphalia, Germany
摘要：
A method for manufacturing multi-coloured positive tooth models that are suitable for manufacturing orthodontic appliances by means of pressure moulding or vacuum moulding a sheet of transparent thermoplastic material comprisies a three-dimensional, bi-coloured powder bed inkjet head printing process. For models which remain in place within the mould whilst the appliance is excised from the moulded sheet, printing teeth and gums different colours provide a visible orientation cut line representing the boundary of the appliance and along which the appliance has to be excised from the mould.
权利要求：
CLAIMS1. A method for manufacturing a multi-colored positive tooth model suitable for manufacturing an orthodontic appliance, the method comprising the step of three-dimensional printing a multi-colored progenitor tooth model in an inkjet head printing process.
2. The method according to claim 1, wherein said ink jet head printing process is a powder bed inkjet head 3D printing process.
3. The method according to claim 2, wherein at least two different binders having different colors are used in the three-dimensional powder bed inkjet head printing process.
4. The method according to claim 2 or 3, wherein each powder layer has a thickness of about 0.09 to about 0.1 mm.
5. The method according to any one of claims 2 to 4, wherein the binder is applied to each powder layer at a resolution of about 600 dots per inch.
6. The method according to any one of claims 2 to 5, wherein at least two binders having different colors are used.
7. The method according to any one of claims 2 to 6, further comprising the steps of infiltrating the progenitor tooth model with a curable resin, and subsequently curing the progenitor tooth model.
8. The method according to claim 1, wherein layers two or more photopolymerizable polymers having different colors are applied to a preceding layer, and are cured before the next layer of photopolymerizable polymer is applied.
9. The method according to claim 8, wherein each layer of photopolymerizable polymer has a thickness of about 16 pm.
10.The method according to claim 8, wherein each layer of photopolymerizable polymer has a thickness of about 8 pm.
11.The method according to any one of claims 8 to 10, wherein the photopolymerizable polymer(s) is/are applied at a resolution of about 600 dots per inch.
12.The method according to any one of claims ito ii, wherein the portion(s) of the positive tooth model representing the teeth is/are printed in another color than the portion(s) representing the gum.is 13.A multi-colored positive tooth model suitable for manufacturing an orthodontic appliance, wherein said multicolored positive tooth model is obtainable by a method as defined in any one of claims ito 12.14.The multi-colored positive tooth model according to claim 13, wherein the portion(s) of the positive tooth model representing the teeth have a different color than the portion(s) representing the gum.15.The multi-colored positive tooth model according to claim l3or 14, wherein the portion(s) of the positive tooth model representing the teeth are whitish or white, and the portion(s) representing the gum is/are pink.16. Use of a multi-colored positive tooth model according to any one of claims 13 to for manufacturing an orthodontic appliance.17.A method for manufacturing an orthodontic appliance, wherein a multicolored positive tooth model is used for pressure molding or vacuum molding of a sheet of thermoplastic material.