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05). The pH of MTA and Cchi were higher than that of other cements at d 3 and 6 (p .05), and were higher than MTA, C, and Czio (p less then .05). Cchi had higher bond-strength than the other groups (p less then .05). PBS samples had higher bond-strength (p less then .05). All cements had hydroxyapatite deposition and the chitosan blend had the lowest porosity and the highest bond-strength.Soil nitrogen (N)-fixing bacteria community plays an important role in the N cycling process in soil, but there is still limited information ab