GI—Ⅱ型渗透陶瓷收缩率和弯曲强度测试 |
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摘 要: |
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关 键 词: | 牙科陶瓷 渗透陶瓷 全瓷 收缩 强度 |
Determination of shrinkage and bending strength of GI-II infiltrated ceramic] |
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Authors: | H Wang Y Chao Y Liao J Sun |
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Institution: | Department of Prosthodontics, School of Stomatology, WCUMS, Chengdu 610041, China. |
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Abstract: | OBJECTIVE: To determine the shrinkage and strength of GI-II Infiltrated Ceramic for providing scientific basis of its clinical use. METHODS: The adobes by slip-casting alumina powder of GI-II Infiltrated Ceramic were sintered at 1125 degrees C for 2 hours. The sintered alumina bodies were then divided into two groups and infiltrated by melt glass at 1125 degrees C and 1100 degrees C respectively for 6 hours. The length of the infiltrated ceramic specimens before and after fabrication was determined to calculate shrinkage. Their strength values were obtained by 3-point bending test. RESULTS: The infiltrated ceramic infiltrated at 1125 degrees C was 0.289 +/- 0.155% in shrinkage, 367.7 +/- 76.1 MPa in strength, and 4.79 in Weibull modulus; that infiltrated at 1100 degrees C was 0.253 +/- 0.043%, 377.5 +/- 64.4 MPa, and 5.52, respectively. There was no statistically significant difference between those two groups. But their strength values were statistically high, compared with 300 MPa. CONCLUSION: The shrinkage of GI-II Infiltrated Ceramic could be compensated by brushing spacer on dies and expansion of die stone. Its strength satisfied the requirement for clinical use of all-ceramic bridge materials. This kind of high-strength and low-shrinkage ceramic could be used for fabricating all ceramic crown and bridge core. |
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