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Molten salt for chemical tempering of dental glass ceramics and use method thereof

A glass-ceramic and chemical tempering technology, which is applied in the field of molten salt for chemical tempering of dental glass-ceramics, can solve the high-efficiency and rapid requirements of dental restorations that cannot be strengthened with dental glass-ceramics, and KOH auxiliary reagents Toxicity and other issues, to achieve the effect of accelerating ion exchange, reducing steps, and stabilizing the process

Active Publication Date: 2019-01-11
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In terms of existing achievements, domestic patents have been applied (application numbers CN106986556 A, CN101921054 A, etc.) to add K 2 CO 3 , KCl, and KOH are auxiliary reagents that can increase the surface stress and stress layer depth of chemically strengthened glass, but they are mainly used in industrial glass; moreover, KOH auxiliary reagents have certain toxicity, and they cannot be used in dental microbes from a safety point of view. Strengthening of crystal glass; in addition, the process of adding KOH auxiliary reagent is complicated, and the ion exchange time is too long, which is not suitable for the efficient and fast requirements of dental restoration

Method used

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  • Molten salt for chemical tempering of dental glass ceramics and use method thereof
  • Molten salt for chemical tempering of dental glass ceramics and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to the ratio of each exchange reagent component in Table 1, weigh a certain amount of analytically pure raw materials, mix them evenly, put them into an alumina crucible, and cover the dental glass-ceramic sample. According to the steps mentioned above, put the crucible into the heating furnace, heat it to 450°C at a rate of 8°C / min and keep it for 1h, then take it out, and cool the sample in the air. After the samples were cleaned, various performance tests were performed, and the results are shown in Table 2. The three-point bending strength value is 639MPa, and the fracture toughness is 4.6MPa×m 0.5 , HV1 Vickers hardness value is 684. Compared with the untreated sample, the mechanical properties are greatly enhanced, which can meet the restoration requirements of parts with higher strength requirements such as posterior crowns. At the same time, the time required for ion exchange is 1 hour, which is greatly shortened compared with other patents.

Embodiment 2

[0042] According to the ratio of each exchange reagent component in Table 1, weigh a certain amount of analytically pure raw materials, mix them evenly, put them into an alumina crucible, and cover the dental glass-ceramic sample. According to the steps mentioned above, put the crucible into the heating furnace, heat it to 450°C at a rate of 8°C / min and keep it for 1h, then take it out, and cool the sample in the air. After the samples were cleaned, various performance tests were performed, and the results are shown in Table 2. The three-point bending strength value is 620MPa, and the fracture toughness is 4.5MPa×m 0.5 , HV1 Vickers hardness value is 676. Compared with Example 1, the mechanical properties are reduced.

Embodiment 3

[0044] According to the ratio of each exchange reagent component in Table 1, weigh a certain amount of analytically pure raw materials, mix them evenly, put them into an alumina crucible, and cover the dental glass-ceramic sample. According to the steps mentioned above, put the crucible into the heating furnace, heat it to 450°C at a rate of 8°C / min and keep it for 1h, then take it out, and cool the sample in the air. After the samples were cleaned, various performance tests were performed, and the results are shown in Table 2. The three-point bending strength value is 626MPa, and the fracture toughness is 4.5MPa×m 0.5 , HV1 Vickers hardness value is 681.

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Abstract

The invention discloses a molten salt for chemical tempering of dental glass ceramics and a use method thereof. The molten salt comprises, by mass, 85% to 95% of KNO3, 3% to 11% of CH3COOK, 1 to 6% ofKCl and 0.5% to 2% of Al2O3. The method comprises: pre-burying a sample in the molten salt, carrying out heating in a furnace at a heating rate of 1-10 DEG C / min and keeping the temperature of 420-500 DEG C for 0.5-4h. The molten salt can protect the surfaces of the dental glass ceramics, greatly shorten the ion exchange time, has excellent mechanical properties such as bending strength, fracturetoughness and hardness after chemical tempering, also has good chemical stability and biocompatibility and can be used for dental all-ceramic restoration materials.

Description

technical field [0001] The invention belongs to the field of glass-ceramics, and in particular relates to a molten salt for chemically tempering dental glass-ceramics and a use method thereof. Background technique [0002] Teeth can not only chew food and help pronunciation, but also have a great influence on the beauty of the face. Teeth are an important part of the human body, and the problems of dental restoration in today's society are becoming more and more prominent. Therefore, the problem of dental restoration is becoming more and more prominent. It has become a research hotspot to choose suitable restoration materials to make higher-strength and more beautiful dentures (commonly known as "dentures") to restore and decorate teeth to restore the biological functions and beautiful appearance of teeth. [0003] Dental silicate glass-ceramic materials (such as lithium disilicate Li 2 Si 2 o 5 , Li 2 O 2SiO 2 ) is favored by everyone because of its mechanical propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00
CPCC03C21/002
Inventor 陈孔发纪锦仲彭兵张腾林燕喃刘鸿琳
Owner FUZHOU UNIV
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