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- W2358174106 abstract "Objective: To study the effects of expansion oattern and expansion rate on fracture resistance of cement-expanded composition screw post. !Methods: 88 simulated tooth roots made of polymethylmethacrylate were divided into ten groups, with every pattern for five group. The expanded plastic sheath of tricuspid valve was made with special separated valve device and cemented and tighten up into root with the screw post by ZPC. Then the root and screw post-core system was compressed by a speed of 1mm/min on the Instron 4302 and the fracture resistance force was recorded. Results: The differences of fracture resistance between different patterns were statistically significant in the case of the same expansion rate. There were also significant differences in fracture resistance between different expansion rates under the same expansion pattern. The specimens showed the highest resistance when the expansion rate was less than 10%. Conclusions: In clinical practice, proper expansion pattern should be chosen and the expansion rate should be controlled within 10% in the restoration of cement-expanded composite screw post. The screw should be tightened up into the bottom of prepared root." @default.
- W2358174106 created "2016-06-24" @default.
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- W2358174106 date "2005-01-01" @default.
- W2358174106 modified "2023-09-25" @default.
- W2358174106 title "The effects of expansion pattern and expansion rate on fracture resistance of cement- expanded composite screw post" @default.
- W2358174106 hasPublicationYear "2005" @default.
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