Cheap machinable zirconium oxide ceramic dental repairing body and preparation thereof

A low-cost technology of zirconia ceramics, applied in dental prosthesis, dental preparations, dentistry, etc., can solve the problems of limited clinical application, inability to process dental CAD/CAM grinding, high strength, etc., and achieve simple process, low cost, The effect of excellent mechanical properties

Inactive Publication Date: 2009-04-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research on all-ceramic dental restorations shows that zirconia has the best overall performance than titanium metal and composite resin, and is more suitable as an all-ceramic dental restoration [J.Dent., 2001, 29: 427; J.Mat.Sci .: in Medicine, 2000, 11(12): 833]. However, the strength of zirconia ceramics is too high, reaching more than 800MPa [J.Am.Ceram.Soc., 2000, 83(11): 2881], which can hardly be used in Dental CAD / CAM (Computer Aided Design and Manufacturing) for grinding, which limits its clinical application

Method used

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  • Cheap machinable zirconium oxide ceramic dental repairing body and preparation thereof
  • Cheap machinable zirconium oxide ceramic dental repairing body and preparation thereof
  • Cheap machinable zirconium oxide ceramic dental repairing body and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 10vol% of CAS sintering aid and (Y, Ce)-TZP powder were mechanically ball milled for about 12 hours, then dried, then added 3wt% PVA as the coupling agent to granulate, then dry pressed at 60MPa, and waited at 200MPa The green body is obtained by static pressure. Then place the green billet in a molybdenum silicon rod furnace at a rate of 2°C / s to 1250°C for 2 hours, then cool down with the furnace. The sintered body was processed into a 3×3×35mm sample, and the flexural strength was measured by the three-point bending method (σ f ) (Instrument: Instron-1195 multifunctional material testing machine; loading rate: 0.5mm / min; span: 30mm; the data of one sample is evaluated by no less than 5 test strips.). σ f Calculated by the following formula:

[0031] σ f =3PL / 2bh 2

[0032] σ f : Bending strength; P: Critical load at break; L: Span (30mm); b: Sample width (4mm); h: Sample thickness (3mm).

[0033] Fracture toughness was measured by indentation method (K PC )(...

Embodiment 2

[0040] Add 20vol% CAS sintering aid, and other conditions are the same as in Example 1. The flexural strength and fracture toughness of (Y, Ce)-TZP ceramics obtained in this example are 366±16MPa and 3.5±0.1MPa m respectively 1 / 2 . The coefficient of linear expansion obtained in this embodiment is 7.19×10 -6 / °C. The cutting time obtained in this embodiment is completed within 567.5±1.6 seconds compared with the time 451.7±0.6 required to process the In-Ceram-Alumina ceramic block into a sample of the same specification, and the machinability is improved.

Embodiment 3

[0042] Add 30vol% CAS sintering aid, and other conditions are the same as in Example 1. The flexural strength and fracture toughness of (Y, Ce)-TZP ceramics obtained in this example are 340±21MPa and 2.7±0.1MPa m respectively 1 / 2 . The coefficient of linear expansion obtained in this embodiment is 7.19×10 -6 / °C. The cutting time obtained by this embodiment is compared with the time 451.7 ± 0.6 required for the In-Ceram-Alumina porcelain block to be processed into a sample of the same specification, and is completed in 533.3 ± 3.8 seconds, and the machinability is comparable to that of the In-Ceram-Alumina porcelain block quite.

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Abstract

A machinable low-cost zirconium oxide ceramics used for repairing tooth is prepared from the nano yttrium oxide and cerium oxide stabilized squar zirconium-oxide polycrystal powder (Y-Ce)-TZP and the silicate glass powder, CaO-Al2O3-SiO2 as sinter assistant through preparing CaO-Al2O3-SiO2 powder and nano-class (Y-Ce)-TZP powder, proportional mixing and low-temp liquid-phase sintering at 1250 deg.C. Its advantages are high machinability, bending strength and break toughness, comparable thermal expansibility, and low cost.

Description

technical field [0001] The invention relates to a low-cost machinable zirconia ceramic dental restoration material and a preparation method thereof, belonging to the field of dental restoration materials. Background technique [0002] Compared with metal and polymer dental restorations, all-ceramic dental restorations have become a class of oral restoration materials with broad application prospects due to their unique properties [Br.Dent.J., 1965, 19: 251]. Through the design of composition and structure, it can have excellent optical properties and similar color, strength and wear resistance to natural teeth, chemical stability in the oral environment, and good biocompatibility. Some new machinable all-ceramic dental restorations have received extensive attention, such as feldspar porcelain (Vita and Celay), mica-based glass ceramics (Dicor) and glass-infiltrated alumina ceramics (In-Ceram-Alumina) [J.Prosthet. Dent., 1996, 75 (1): 18; J. Mater. Sci., 1997, 32 (13): 3621;...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): A61K6/04C04B35/48
Inventor荣天君王士维黄校先郭景坤
OwnerSHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI