THE EFFECT OF CARBOXYMETHYL CHITOSAN/AMORPHOUS CALCIUM PHOSPHATE TO GUIDE TISSUE REMINERALIZATION OF DENTIN COLLAGEN
Objective: Carboxymethyl chitosan/amorphous calcium phosphate (CMC/ACP) can replace the role of dentine matrix protein 1. Guided tissue
remineralization (GTR) is a method of extrafibrillar and intrafibrillar collagen remineralization. This study analyzed the ability of CMC/ACP to achieve
intrafibrillar and extrafibrillar remineralization on demineralized dentin.
Methods: We divided 12 demineralized occlusal cavities into four groups: 7 days control group, 14 days control group, 7 days CMC/ACP group, and
14 days CMC/ACP group. In the control group, the cavities were directly filled with temporary restoration material, while the cavities of the CMC/ACP
groups first underwent application of CMC/ACP and were then filled with temporary restoration material. All samples were stored in a 37°C shaking
incubator. 12 samples were analyzed by energy-dispersive X-ray (EDX) spectroscopy and four were analyzed by transmission electron microscope
Results: From day 7 to day 14, there was a significant increase in calcium and phosphate levels within the CMC/APC groups. The phosphate levels
were much lower than the calcium or minerals formed on the 7th day, in the form of hydroxyapatite. TEM analysis shows that the CMC/ACP group
exhibited more intrafibrillar and extrafibrillar remineralization.
Conclusion: CMC/ACP can improve the GTR process.
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