| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
The present study aimed to evaluate the influence of crown thickness on the fracture resistance of monolithic zirconia crowns. In addition, the effects of aging (spontaneous crystalline phase transformation), cyclic loading and addition of coloring agents were investigated.
The results demonstrated that monolithic zirconia crowns with a minimal thickness of 0.5 mm could work as molar crowns. Even though monolithic zirconia crowns were affected by aging and cyclic loading, the fracture load of the crown was sufficiently higher than maximum bite force (about 1000 N). Furthermore, it was shown that the coloring procedure would not affect the strength of zirconia. The results obtained in the present study should be verified in clinical studies in the future.
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