高导热、易流动牙胶类根管充填高分子复合材料

Complete and dense obturation of root canal system plays a key role in improving curative effect of root canal treatment, successful rate of oral disease and tooth preservation. Under the safe temperature not leading to thermal injury of periodontal tissue, gutta-percha based polymer composite material with high thermal conductivity and flowing property is designed and prepared, in order to achieve a rapid fusion and flow completely of traditional endodontic filling materials. Silicon microfibers are prepared through the combination of a sol-gel process and an electrospinning technique. Surface modified silicon microfibers served as templates for the electroless plating of silver nanoparticles. The novel micron-nano composite structure would not only target on superior flowing property through reducing nanometer effect and particle aggregation with micron fiber, but also on high thermal conductivity of Ag particles. And then, a novel gutta-percha based polymer composite material with high thermal conductivity and flowing property for root canal obturation is prepared with the combination of gutta-percha based polymer compound technique. This interdisciplinary project involves macromolecular materialogy, heat transfer and stomatology, which would provide a new conception and application prospect for revealing the rule of heat transfer in polymer composite materials and its development. Furthermore, a significant value is found in filling effect of root canal obturation and curative effect of root canal treatment.

严密完善的根管充填是提高根管治疗成功率、治愈口腔常见疾病、保存患牙的关键与保障。传统牙胶类根管充填高分子复合材料因导热性能受限，在不造成牙齿周围组织热损伤的温度下，难以实现材料整体快速熔化及流动，从而难以达到严密的三维充填效果。本项目将制备一种高导热、易流动的牙胶类根管充填高分子复合材料。以静电纺丝术和溶胶凝胶法制备微米二氧化硅纤维，以化学沉积法在其表面电镀纳米银粒子，通过这一新型微-纳复合结构的构筑与制备，既可利用微米纤维的几何效应减少粒子聚集，使填料均匀分散，保证复合材料的良好流动性，又可发挥纳米银颗粒的高导热性，并结合古塔波胶高分子基体复合技术，获得高导热、易流动双重特性的牙胶类根管充填高性能复合材料。本项目涉及高分子材料学、传热学和口腔医学多方面，高度的学科交叉不仅为揭示高分子复合材料的导热规律及其研发提供了新的思路与应用前景，而且对改善根管充填效果、提高根管治疗疗效具有重要价值。

严密完善的根管充填是提高根管治疗成功率、治愈口腔常见疾病、保存患牙的关键与保障。通过探究热量在现有牙胶类根管充填材料中的传导模式及分布规律，证明了材料导热性能与其成分，特别是填料有关，但受限于填料导热能力及填充量的影响，难以实现材料软化后流动，从而难以达到严密的三维充填效果。本项目制备了一种高导热性导热纤维粒子，它以静电纺丝术和溶胶凝胶法制备微米二氧化硅纤维，以化学沉积法在其表面电镀纳米银粒子，并将这种导热粒子与基础导热填料氧化锌复配，既可利用微米纤维的几何效应减少粒子聚集，使填料均匀分散，又可发挥纳米银颗粒的高导热性，再结合古塔波胶高分子基体复合技术，获得高导热性的牙胶类根管充填高分子复合材料。在获得高导热性的基础上，进一步剖析复合材料导热性能与流动性能的相关性机理，针对二者的最佳综合效果进行材料配比的优化，并通过侧支根管充填深度实验验证了新型复合材料的导热性及流动性均显著高于传统牙胶类根管充填高分子复合材料，最终获得了高导热、易流动双重特性的牙胶类根管充填高性能复合材料。本项目涉及高分子材料学、传热学和口腔医学多方面，高度的学科交叉不仅为揭示高分子复合材料的导热规律及其研发提供了新的思路与应用前景，而且对改善根管充填效果、提高根管治疗疗效具有重要价值。

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