Method for quickly producing removalbe partial denture bracket

Abstract

The invention discloses a process for quickly manufacturing a removable partial denture bracket by laser, which mainly comprises the following steps: acquiring a three-dimensional part model of a tooth jaw of a patient, adding an indented thin-wall support to the model, layering and dispersing to generate laser processing numerical control instructions, and paving powder on a preheated and insulated metal substrate; and then using a continuous YAG or fiber laser with the beam quality M<2> is smaller than 1.1 to melt metal or alloy powder in a special granularity range layer by layer by using optimized powder paving thickness, falling height of a forming cylinder and a laser processing technique under a focusing light spot of 10 to 100 mu m, and finishing melting, accumulating and processing of the whole part; and finally carrying out tempering heat treatment on the formed part, to obtain the removable partial deture bracket, which combines metallurgy and has a tissue density close to 100 percent. The process can overcome the difficulty of the prior art, and directly manufacture the removable partial denture bracket which has the advantages of high precision and high surface smoothness, no deformation and excellent mechanical property.

Description

technical field [0001] The invention belongs to the field of manufacture of stomatological restorations, in particular to a method for rapidly manufacturing removable partial denture brackets by selective laser melting technology. Background technique [0002] Dentition defect is a common and frequently-occurring disease in stomatology, accounting for about 24% to 53% of the natural population. Bracket-type removable dentures are one of the ideal and preferred restoration methods for patients with dentition defects due to their relatively low price and convenient and comfortable wearing. There are two types of materials for making denture brackets, metal and plastic. Metal brackets are obviously superior to plastic brackets in terms of mechanical properties. They will not be deformed or broken after long-term use in the oral cavity, and metal brackets are thinner under the premise of ensuring performance. more comfortable. Therefore, the design and manufacturing method of ...

AI Technical Summary

Problems solved by technology

In the superplastic molding process, due to the incomplete fit between the mold and the processed material, and due to the influence of thermal expansion during the forming process and the difference in the thickness distribution of the inflated molded parts, there is a large error in the size of the bracket.

To sum up, the above-mentioned processes have some common disadvantages: all need to make molds, the entire manufacturing process is cumbersome and irregular, the cycle is long, the cost is high, and quality problems often occur

The shape of the denture bracket is complex and the wall is thin. Due to the relatively large slope surface and thin wall, the laser forming process will be terminated by the influence of the large slope surface and thin wall; at the same time, because most of the parts are thin-walled special-shaped structures, The thermal stress generated during the forming process can cause irreversible deformation of the part and scrap the part

Due to the above-mentioned technical difficulties, there are currently no reports of metal laser rapid prototyping technology successfully manufacturing removable partial denture brackets at home and abroad.

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