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A zirconia denture with gradient mechanical properties and its photocuring dynamic molding method

A molding method and zirconia technology, applied in the field of denture preparation, can solve the problems of complex molding process and low efficiency, and achieve the effects of reduced process cost, high precision and small particle size

Active Publication Date: 2020-08-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The currently proposed zirconia gradient porosity molding process is based on the principle of changing the slurry with different components during the molding process to form different porosities, and the molding process is complex and inefficient.

Method used

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  • A zirconia denture with gradient mechanical properties and its photocuring dynamic molding method
  • A zirconia denture with gradient mechanical properties and its photocuring dynamic molding method
  • A zirconia denture with gradient mechanical properties and its photocuring dynamic molding method

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Embodiment 1

[0043] Such as figure 2 As shown, this embodiment provides a method for preparing functionally gradient ceramics formed by SLA photocuring, and the specific steps are as follows:

[0044] 1) Slurry preparation

[0045] Take 15mL of trimethylolpropane triacrylate and 5mL of ethoxylated pentaerythritol tetraacrylate as photocurable resin monomers; weigh 6.2g of Tego 685 dispersant, 0.44g of polymerization inhibitor MQ, and 1.1g of leveling agent, 1.1g defoamer and 1.1g graphite dye. The resin monomer and various additives were evenly mixed, and ball milled in a ball mill at a speed of 1000 rpm / min for 6 hours to obtain a premixed solution. Take again 62g of zirconia powder (100 μm in particle size), and ball mill it for 2 h at a speed of 1000 rpm / min in a ball mill; then weigh 2.2g of photoinitiator diacylphosphine oxide 819 and 62g of zirconia powder (100 μm in particle size), Ball mill at a speed of 100 rpm / min for 2 hours in a ball mill to obtain a homogeneously mixed cer...

Embodiment 2

[0055] Such as image 3 As shown, this embodiment provides a preparation method of gradient functional ceramics formed by DLP photocuring, and the specific steps are as follows:

[0056] 1) Model processing:

[0057] Use Solidworks software for 3D solid modeling, get the ceramic part model and convert it into an STL file; import the STL model into the self-written rapid prototyping auxiliary software, set its slice layer thickness, exposure time and gray value, and generate support . Set four groups of samples, the gray value of the porous layer is 150, 185, 220, 255 respectively; the exposure time is 3s, and the molding thickness is 60μm. For the dense layer, the gray value of the picture is 255, the exposure time is 8s, and the molding thickness is 60 μm. Import the data file into the control program of the photocuring molding equipment.

[0058] 2) Slurry preparation

[0059] Take 15mL of trimethylolpropane triacrylate and 5mL of ethoxylated pentaerythritol tetraacryla...

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Abstract

The invention discloses zirconia denture with gradient mechanical property and a light-curing dynamic molding method thereof. The method comprises the following steps: based on three-dimensional light-curing molding or digital optical processing molding, dynamically controlling the process parameters in the molding process so as to realize gradient change of the denture occlusion surface and fractional porosity of the matrix; performing high-temperature sintering on the molded biscuit to form a ceramic mesh structure with porosity gradient change, and filling the pores with water-based zirconia slurry by virtue of pressure infiltration; combining nano zirconia particles contained in penetrating fluid after secondary medium-temperature sintering and the ceramic mesh structure, and forming the density alternating structure. Therefore, the mechanical property of the denture occlusion surface is reduced, and excessive wear of natural teeth on the opposite side in the oral cavity is avoided. According to the method disclosed by the invention, the limitation that ceramic slurry of different components needs to be adopted in the preparation process of the traditional gradient functional ceramic denture is changed, and the problem that the natural teeth on the opposite side in the oral cavity are excessively worn due to extremely high hardness of the denture prepared from the zirconiamaterial can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of denture preparation, and in particular relates to a zirconia ceramic denture with gradient mechanical properties and a photocuring dynamic molding method thereof. Background technique [0002] Ceramic materials are widely used in biomedical fields due to their excellent mechanical properties, good chemical stability and biocompatibility. Among them, zirconia ceramics are especially suitable for making oral restorations due to their high bending strength and fracture toughness. However, the hardness of the crown made of zirconia ceramics can reach 1500Hv, which is much higher than the hardness of 350Hv of natural tooth enamel. [0003] The tooth tissue in natural teeth has a gradient microstructure from the outside to the inside, and its mechanical properties are "tough on the inside and hard on the outside". Similarly, a functionally graded material is a non-homogeneous material whose properties change ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/634B33Y10/00B33Y70/10B28B1/00A61C13/083A61K6/818
CPCA61C13/083A61K6/818B28B1/001B33Y10/00B33Y70/00C04B35/48C04B35/622C04B35/63424C04B2235/6026C04B2235/616C04B2235/661C04B2235/96
Inventor 刘亚雄张玉琪刘绘龙任辉王亚宁连芩王玲贺健康
Owner XI AN JIAOTONG UNIV