Abstract
Dental implants are exposed to cycle loadings and thermal changes. The thermal properties of the materials in dentistry are important in terms of the biological changes that these materials will create in living tissues. The normal temperature of the oral cavity varies between 32-37℃, while eating, it can vary between 0-80℃ with hot-cold foods which led to the trauma and implant deteriorations. Si<sub>3</sub>N<sub>4</sub> ceramic is a good candidate to solve these problems due to its inertness, high fracture toughness, strength, high thermal shock resistance and low density. Also, the surface modification of Si<sub>3</sub>N<sub>4</sub> is important to enhance the interaction between the implant and bone. In recent years, biodegradable organic biomaterials as CTs (CTs) and silver doped hydroxyapatite (HAPs) combinations have a great attention to improve the Si<sub>3</sub>N<sub>4</sub> effectiveness. In this study, MgO, SiO<sub>2</sub>, and Y<sub>2</sub>O<sub>3</sub> included substrates were fabricated for fast and slow cooling rate during sintering in dental applications. CTs/HAPs fibers were coated with the electrospinning method to develop a modified Si<sub>3</sub>N<sub>4</sub> substrate. The crystal structure, microstructure and thermal diffusivity measurement of the substrates and spun surfaces were characterized with XRD, SEM and Laser Flash Method. From the results, the higher density (3.25g/cm<sup>3</sup>) and thermal conductivity (46.35W/mK) for Si<sub>3</sub>N<sub>4</sub> were observed for the fast cooling process during sintering compared with the slow cooling process (3.22g/cm<sup>3</sup> and 44.60 W/mK). The hardness and strength of the fast cooled substrate were measured as 1350 HV and 1800 MPa which are greater than the slowly cooled samples (1190 HV, 1670 MPa). CTs /HAPs fibers are homogeneously deposited with electrospinning on the surface of the fast cooled Si<sub>3</sub>N<sub>4</sub> substrate to develop the surface functionality. This functionalized substrate can be a candidate in dental applications.
Highlights
The thermal properties of the materials used in dentistry are important in terms of the biological changes that these materials will create in living tissues
The normal temperature of the oral cavity varies between 32-37°C, while eating, it can vary between 0-80°C with hot-cold foods [1,2]
Pending the drilling of the Electrospun Chitosan/Silver Doped-Hydroxyapatite Nano-Fibers on Thermal Conductivity Modified Si3N4 Ceramics with Different Sintering Cooling Rate bone, the temperature could increase above 47°C and cause irreversible osteonecrosis
Summary
The thermal properties of the materials used in dentistry are important in terms of the biological changes that these materials will create in living tissues. Pending the drilling of the Electrospun Chitosan/Silver Doped-Hydroxyapatite Nano-Fibers on Thermal Conductivity Modified Si3N4 Ceramics with Different Sintering Cooling Rate bone, the temperature could increase above 47°C and cause irreversible osteonecrosis. It is important to find an optimal condition where the increase in bone temperature during the bone drilling process would be minimal [3] Because of these considerations, new materials are needed to solve these problems. The effect of the cooling properties during sintering on the MgO, SiO2 and Y2O3 included Si3N4 properties such as density, thermal properties depend on the temperature. The electrospinning method is the most preferable coating method to fabricate nanofibers for biomedical materials surfaces It is a very simple and cost-effective method for mass production [20,21,22]. The electrospinning of the CTs/HAPs fiber coating on modified Si3N4 substrate was purposed
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