Thermal decomposition of developing enamel

Calcified Tissue International
I MayerD Deutsch

Abstract

The decomposition of forming, maturing, and mature enamel was studied between room temperature and 1,000 degrees C by powder X-ray diffraction and infrared absorption methods. In mature dental enamel, carbonate decomposition proceeds relatively fast until 500 degrees C and at a slower rate beyond it. In forming and maturing enamel, decomposition is faster and is completed around 800 degrees C. The formation of beta-Ca3(PO4)2 is observed in dental enamel at 500 degrees C. At 1,000 degrees C, the apatite phase in forming and maturing enamel transforms almost completely to beta-Ca3(PO4)2, whereas in mature enamel, even at 1,000 degrees C, only partial decomposition occurs. Infrared results show the appearance in dental enamel of (1) A-type carbonate at room temperature and in the 500-900 degrees C range, in addition to the commonly observed B-type carbonate, and (2) intermediate CO2 molecules during carbonate decomposition (200-500 degrees C).

References

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Citations

Aug 1, 1991·Calcified Tissue International·M IijimaY Moriwaki
May 13, 2006·Vibrational Spectroscopy·Adele L Boskey, Richard Mendelsohn
Sep 19, 1997·Journal of Biomedical Materials Research·A ItoT Tateishi
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Jun 23, 2016·Journal of Biomedical Optics·Quang-Tri LeRui Vilar
Feb 14, 1996·Inorganic Chemistry·Erna A. P. De MaeyerIlse Y. Pieters

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