Bibliographic citations
Castañeda, J., (2023). Desarrollo de un material restaurador dental experimental a base de nanohidroxiapatita obtenida de la cáscara de huevo [Universidad Peruana Cayetano Heredia]. https://hdl.handle.net/20.500.12866/15499
Castañeda, J., Desarrollo de un material restaurador dental experimental a base de nanohidroxiapatita obtenida de la cáscara de huevo []. PE: Universidad Peruana Cayetano Heredia; 2023. https://hdl.handle.net/20.500.12866/15499
@phdthesis{renati/911311,
title = "Desarrollo de un material restaurador dental experimental a base de nanohidroxiapatita obtenida de la cáscara de huevo",
author = "Castañeda Vía, José Alberto",
publisher = "Universidad Peruana Cayetano Heredia",
year = "2023"
}
The present work consisted in the formulation of a dental restorative material based on hydroxyapatite (HAp) nanoparticles obtained from chicken eggshells. For this, the mechano-synthesis method was used for the preparation of HAp using the eggshell as a calcium precursor, varying the milling time and the heat treatment temperature. The DRX, FTIR, MEB, EDS, SPOS and CRM techniques were used to determine the optimal preparation conditions, obtaining that for 16 hours of milling and 400 °C of heat treatment, the resulting HAp consisted of a pure material with size nanometric, carbonate inclusions and higher internal elastic stress. At the same time, computational simulations were carried out using ab-initio calculations to obtain some theoretical physical properties in two types of HAp: without and with inclusion of carbonate ions in its structure. In addition, two types of reinforcements were synthesized: a mechanical reinforcement of decagonal quasicrystal Al-Cu-Fe-Cr using the arc furnace technique, and an Ag nanoparticles reinforcement by in-situ chemical co-precipitation. Both showed to be nanostructured materials with stoichiometry as expected. Finally, composite resins (RBCs) with pure HAp fillers were formulated by manual mixing of Bis-GMA/TEGDMA monomers, and different filler concentrations (40 – 70% wt.). The RBCs were studied using different evaluation methodologies, obtaining properties such as color, roughness, degree of conversion, and antibacterial inhibition similar to those of two commercial resins; or characteristics such as sorption, solubility and microhardness different from those of said commercial resins. Furthermore, analytical models were proposed to describe the mechanical behavior of HAp-based RBCs, as well as to predict their mechanical strength as a function of filler content. It was concluded that HAp-based RBCs have potential application as a low-cost and eco-friendly dental restorative material.
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