测试人牙周膜粘弹性力学特性的纳米压痕实验条件研究

Abstract

Abstract: Objective：To design experimental conditions via nano-indentation test, in order to investigate the viscoelastic properties of the human periodontal ligament（PDL）. Methods：After preparation of human PDL samples, the nano-indentation creep test and conventional reduced elastic modulus test were carried out by a flat punch in a moistful environment. The experimental scheme was set up according to the control variable method, and the influence of different experimental conditions on the experimental outcomes were analyzed. Results：The optimum parameters were obtained as follows: the nano-indentation creep test demanded the loading rate as 0.3-0.5 mN/s; the holding time of 25s and peak load of 2-3 mN were suitable for the conventional nano-indentation test. The nano-indentation creep curve of human periodontal ligament and the reduced elastic modulus range of 0.0121-6.84 MPa were obtained. Conclusion：The viscoelastic properties of human periodontal ligament were verified. We obtained the experimental conditions that were applicable to nano-indentation test for human periodontal ligament.

Key words: Nano-intendation, Viscoelastic, Periodontal ligament, Biomechanics

CLC Number:

R783.5

References 28

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Study on the experimental conditions of nano-indentation test for investigating the viscoelastic properties of human periodontal ligament

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