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(a–c) The variation of the normalized length of HAp crystallites in human enamel, dentine and synthetic HAp powders (red points for heating and blue points for cooling). (d–f) The normalized mean thickness (with constant volume fraction) of HAp crystallites in enamel, dentine and synthetic HAp powders. (g–i) The normalized mean thickness accounting for the mineral volume fraction variation of HAp crystallites in enamel, dentine and synthetic HAp powders. (Online version in colour.)
