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Research on the Coloration of Dental CAD/CAM Glass Infiltration Alumina Ceramic

Author: YiYuanFu
Tutor: WangZhongYi
School: Fourth Military Medical University
Course: Clinical Stomatology
Keywords: Dental ceramics Alumina Glass infiltration CAD / CAM Color Mechanical Properties
CLC: R783.1
Type: PhD thesis
Year: 2003
Downloads: 208
Quote: 4
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Abstract


The combined oral prostheses CAD / CAM technology and glass infiltration techniques to produce high-strength glass infiltration alumina ceramic restorations, and opened up a new way to repair the body's automated processing and high-strength all-ceramic crown and bridge production. This study has been made of high-strength dental CAD / CAM with porous alumina materials on the basis of the results, focused on solving the problem of glass infiltrated alumina ceramic coloring. Different colored metallic oxides on the penetration of glass and permeation aluminum porcelain coloring rule, explore infiltration alumina ceramic substrate and the surface decorated porcelain having good color matching solutions for color matching of the key issues - the lightness of the base material, After preferably colored oxide component and content, independent successfully prepared four kinds of the permeate having a specific color with a glass frit. Color and stability of the investigated glass infiltrated alumina ceramics and Vita In-Ceram contrast, studies using self-developed penetration of glass powder aluminum porcelain color Vitadur Alpha veneering porcelain color matching, testing the penetration Physical and mechanical properties of glass and glass infiltrated alumina ceramics, make CAD / CAM glass infiltrated alumina ceramic to achieve the level of clinical applications. And made some progress in dental ceramic color matching theory and practice. The specific findings are as follows: 1. Optional oxide, lanthanum oxide, boron oxide, silicon oxide, alumina and a coloring oxide, etc. as raw materials, and after 1400 ℃ molten successfully prepared the four kinds permeate frit having a specific color. Glass thermal expansion coefficient α of 6.41 × 10 -6 ° C -1 density 2.21g/cm 3 , the three-point bending strength for 112.08 The ± 10.58MPa, the fracture toughness of 2.01 ± 0.09MPam 1/2 , Vickers hardness of 6.39 ± 0.12GPa. 2. Alumina block preparation of glass infiltration firing at 1450 ℃ CAD / CAM alumina ceramics, density 3.88g/cm 3 , the thermal expansion coefficient of 7.68 × 10 -6 the ℃ -1 , the fracture toughness of 3.70 ± 0.13MPam 1/2 386.99 ± 27.72MPa three-point bending strength, Vickers hardness of 9.89 ± 0.18GPa. 3. Cerium oxide can effectively given penetrate glass yellow goods, the but lower glass infiltrated alumina ceramic lightness and increase the value of a role of weak. Cerium oxide, erbium oxide in combination with erbium oxide content increases the color to yellow and red direction offset, reduce the brightness of the ability of the material is still relatively small; cerium oxide, erbium, such as the quality of the Fourth Military Medical the Human Bo ten Dissertation than changes, the changes in color parameters and quality than the Q has a strong linear relationship; the same total mass of oxide, riveting, the relative changes in the quality of the oxide bait, equivalent toner total moles changes, the color variation with two oxide relative to the number of added amount. The first on the basis of the two oxides, the iron oxide is further added, the test results show that the iron oxide to reduce the brightness, increase red product from the main infiltration alumina porcelain. 4. Contrast swatch: Vita 3D-Master shade guide covers almost all VitaClassical than swatches of lightness and saturation range, and better able to cover the Chinese the tooth color card chroma range. 3D Bu swatches L range 55.39 68.44 a range of 0.52 ~~ 5.58, b range was 7.22 to 21.57; penetration of In-Ceram alumina ceramic craftsmen shade L for 67.68 to 79.03, a ranges from a 0.11 ~~ 3.94, b ranges from 13. sl ~ 24.75. Clinical shade than mechanic shade brightness range of about 9 to 12 lower, suggesting that this difference is to eliminate the Mountain penetrate aluminum porcelain decorated porcelain material. 5. Lmm thickness of the sample as a standard, Vita In-Ceram glass powder infiltrated alumina ceramic color parameter, Bu range to 69.39 to 78.41, a range of 1.82 ~~ 4.02, b ranges from 18.35 to 24.42. Homemade permeation glass frit after infiltration aluminum porcelain color parameters, L range to 68.80 to 78.44, and a range of 1.32 ~~ 4.75 and b ranges from 16.86 ~ the ZI. 86. The color overall distribution Vita In-Ceram penetration of alumina ceramic and Vita In-Ceram mechanic approximate shade. Different No. B values ??and saturation than 3 aluminum porcelain AL3 the low aluminum porcelain, B value is higher: NO. 1 and NO. B values ??and saturation than 2 aluminum porcelain and low the ALZ aluminum porcelain. Homemade glass powder better fitting Vita reflectance spectra of the glass powder. With the infiltration time and the infiltration temperature increases, the alumina ceramic color lightness values ??decreased slightly, and the a and b values ??increased slightly, but the small color changes, substantially in the human eye can not perceive or just discernible range. In this study, mainly N. 2 colors frit ALZ color glass frit, for example, two nuclear ceramic base material in the construct (h E = 0.58) to the color difference after 0.4mm dentine porcelain has been within the range of the human eye is not easy to distinguish. Found in the study after the penetration of the other three colors of glass frit using two materials, aluminum porcelain color variation and the same. The experiments show that the own independent development of the four kinds of glass frit having a specific color can be effectively matched. 3 - The Fourth Military Medical science Bo 10 Dissertation VitBdur Alpha veneering porcelain to complete the reproduction of natural tooth color to make the dental CAD AM glass infiltrated alumina ceramic overall performance reached the level of clinical application.

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CLC: > Medicine, health > Oral Sciences > Oral orthotics > Dental Materials Science
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