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Thermal decomposition of developing enamel.

I Mayer¹, S Schneider, M Sydney-Zax

¹Department of Inorganic and Analytical Chemistry, Hadassah Faculty of Dental Medicine, Hebrew University, Jerusalem, Israel.

Calcified Tissue International

|April 1, 1990

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Dental enamel

Area of Science:

Biomineralization
Materials Science
Dental Research

Background:

Dental enamel, primarily composed of hydroxyapatite, undergoes changes during formation and maturation.
Understanding the thermal decomposition of enamel is crucial for biomaterials and dental restoration research.

Purpose of the Study:

To investigate the thermal decomposition behavior of forming, maturing, and mature dental enamel.
To identify phase transformations and carbonate behavior under heat treatment.

Main Methods:

Powder X-ray diffraction (XRD) analysis.
Infrared (IR) absorption spectroscopy.
Thermal treatment from room temperature to 1,000 degrees C.

Main Results:

Related Experiment Videos

Mature enamel shows significant carbonate decomposition by 500 degrees C, with slower rates thereafter.
Forming and maturing enamel decompose faster, completing around 800 degrees C.
Beta-tricalcium phosphate (beta-Ca3(PO4)2) forms at 500 degrees C and becomes the dominant phase in forming/maturing enamel at 1,000 degrees C.
Infrared analysis revealed A-type carbonate and intermediate CO2 molecules during decomposition.

Conclusions:

The thermal stability of dental enamel varies significantly with its developmental stage.
Carbonate content and phase transformations are key indicators of enamel maturation and decomposition.
Distinct carbonate species and intermediate molecules are involved in the thermal breakdown of enamel.