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Electron microscopy analysis of the thermal phase transition from hydroxyapatita to β‐TCP observed in human teeth
Author(s) -
REYESGASGA JOSÉ,
BECERRIL NANCY VARGAS
Publication year - 2019
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/jmi.12839
Subject(s) - materials science , transmission electron microscopy , scanning electron microscope , phase transition , high resolution transmission electron microscopy , whitlockite , analytical chemistry (journal) , crystallography , mineralogy , chemistry , composite material , nanotechnology , metallurgy , calcium , physics , chromatography , quantum mechanics
Summary Samples of enamel and dentin from human molar teeth were heated in air from room temperature (25°C) up to 1200°C and the phase transition from hydroxyapatite (HAP) to tricalcium phosphate (β‐TCP) was recorded. The changes produced in morphology and chemical composition in the tooth during heating were analysed by light microscopy, scanning electron microscopy (SEM), characteristic x‐ray energy dispersion spectroscopy (EDS), x‐ray diffraction (XRD), electron diffraction, transmission electron microscopy (TEM) and high‐resolution electron microscopy (HRTEM). The results indicated a high correlation relationship among Ca content, P content, O content and Na content, and the existence of the Kirkendall effect during the HAP‐ β‐TCP phase transition. Lay Description This work is related with tooth materials. Samples of enamel and dentine from human molar teeth were heated in air from 25°C up to 1200°C and the phase transition from hydroxyapatite (HAP) to tricalcium phosphate (β‐TCP) was recorded. The β‐TCP phase is also known as whitlockite. The changes produced in morphology and chemical composition in the tooth during heating were analysed by electron microscopy and X‐ray diffraction. The results indicated a high correlation relationship among Ca, P, O and Na contents, and the existence of the Kirkendall effect, the atomic diffusion producing voids, during the HAP‐ β‐TCP phase transition.