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Surface Ca and P elution was documented after 12 hr of exposition to the acid solution by dissolution of spherulites and the whole canal surface decalcified in depth after 15 days by SEM-EDAX analysis. The periodic pattern of collagen fibrils was still evident up to 15 days of decalcification together with fine granular deposits of a not-collagenic proteic material, while after 30 days no period was observed in the decalcified fibrils. Collagen mineral cast at 400°C calcination. Complete crystalline transformation at 1200°C. Up to 15 day