Manufacturing method of additional material for all-ceramic dental restoration

Abstract

The invention relates to a manufacturing method of an additional material for an all-ceramic dental restoration. A selective photocuring technology is used for quickly forming to obtain an auxiliary forming mould, the auxiliary forming mould is taken as a template to generate an automatic correction function on a dental restoration ceramic greenware obtained by a ceramic slurry extrusion technology, so as to achieve the advantages of integrating high accuracy of the selective photocuring technology and high quality of the ceramic slurry extrusion technology. In addition, a ceramic slurry extrusion additional material manufacturing device with a special multi-material extrusion device can be used for directly generating the multilayer all-ceramic dental restoration of simulated natural teeth, technical processes are further shortened, and the manufacturing method hopefully serves as a technology of high accuracy and high efficiency for manufacturing the all-ceramic dental restoration infuture.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and particularly relates to an additive manufacturing method for an all-ceramic oral prosthesis. Background technique [0002] Human anatomy varies greatly due to their genetics and the influence of the external environment. In many cases, each dental restoration is unique and only suitable for a specific patient. In addition, oral restorations usually need to meet the dual requirements of functional restoration and aesthetics, not only high dimensional accuracy, but also a series of mechanical properties (strength, hardness, toughness), optical properties (transparency, color, fluorescence) , physicochemical properties (corrosion resistance, water resistance, stability), biological properties (compatibility), etc., so it has very strict requirements on materials and manufacturing processes. [0003] Materials: Oral restoration can be traced back to ancient Rome 2,500 years ago, when artis...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the current dental CAD / CAM technology for making all-ceramic restorations: 1) It mainly relies on CNC cutting equipment, the equipment and consumables are expensive, and the waste of materials is large (about 80% of the raw materials can only be treated as waste), lead to high cost of its products

2) During the cutting process, micro-cracks and high-temperature crystallization are prone to occur on the ceramic surface, resulting in a decline in product performance

3) Due to the limitation of the size of the tool, the details of the cusps, grooves, and ridges on the occlusal surface of the crown cannot be processed directly, and subsequent manual lathes are required

4) Because based on the material reduction process, oral CAD / CAM technology can only process a single material, and cannot form a multi-layered crown structure that simulates dentin and enamel, and subsequent manual porcelain stacking is required

However, the blank formed by this technology has low strength, easy deformation and poor dimensional stability.

Moreover, due to the limitation of the diameter of the extrusion nozzle, its accuracy is usually 0.2mm to 0.4mm, which cannot meet the dimensional accuracy requirements of oral restoration.

In addition, this technology usually adopts a single nozzle structure, which is less efficient than surface forming technology, thus limiting the application of this technology in oral restorations

[0009] To sum up, at present, various single additive manufacturing technologies are still unable to meet the stringent production requirements of all-ceramic dental restorations, so an additive manufacturing process that can combine the advantages of various processes is needed

Images