Analyse quantitative des propriétés mécaniques de fraises dentaires rotatives en NiTi et étude de la fabrication de larges microstructures par polymérisation induite à deux photons

Abstract : One third of dental emergencies and a high percentage of toothaches are endodontics related. Rotary instruments employed in endodontic treatment may break inside the root canal due to material fatigue. Once broken, extracting the fractured part from the canal is a difficult job and is annoying to both the patient and the dentist. Therefore, warning of an imminent fracture during clinical use or developing good strategies to increase its mechanical properties will be a great help to avoid medical/ legal complications. The research is studied from two parts. The first part established a standard testing platform, simulating several root canal parameters, proposing a series of strategies to improve the fatigue life and material's mechanical properties. Also, a monitoring system employing Fiber Bragg Grating (FBG) sensors has been attempted. The reason of using FBG is its small size which is very promising in integrating with the handpiece of the endodontic equipment. In the current work, by picking up and analyzing the stress wave through Fast Fourier Transform (FFT), we can reveal the energy variation and the frequency shifting phenomenon under some characteristic frequencies. It is hoped that with these information, we can avoid/alleviate the occurrence of unexpected fracture. As for the fatigue test, data showed that the fatigue life can be improved when certain heat treatment or reciprocating rotation method applied. Such phenomenon may be closely related to the phase composition in Ni-Ti Alloy and the maximum tension stress is decreased when reciprocating movement applied. Studies showed that the more content of martensite phase in the needle, the more fatigue life can be achieved. However, it may need to take compromise with needle's cutting efficiency. For this issue, we can combine cryogenic treatment and heat treatment to get better fatigue life without compromising with its cutting efficiency. The second part is to fabricate high resolution, large size of new type endodontic needles by employing two-photon polymerization (TTP) technique. The work is done in the university of Joseph-Fourier LiPhy lab, France. Unlike traditional TPP manufacturing, which had a limitation of its products size due to small lase power, repetition rate and piezo driven stage, we use Ormocer resin, 130 kHz, 1W powerful 532 nm laser with step motor driven X-Y stage to fabricate high bio-compatible 800 µm cell scaffold and 1.2 cm height needle. Also, to improve the product quality of TPP, the laser power correction approach had been attempted. During TPP fabrication, the laser focusing shape changed when the fabrication surface was moved up in z direction. This results in that we need more power to ensure the voxel size is the same at different z. To correct such defect, a method of the laser power correction and formula for the correcting power are proposed. The formula is derived from the concept of keeping exposure condition the same.
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Chao Yuan Liu. Analyse quantitative des propriétés mécaniques de fraises dentaires rotatives en NiTi et étude de la fabrication de larges microstructures par polymérisation induite à deux photons. Autre [cond-mat.other]. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENY023⟩. ⟨tel-01071805⟩

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