Repair of mandibular defects with hydrogel loaded with nano-hydroxyapatite in rats

doi:10.19439/j.sjos.2022.05.001

Abstract

Abstract: PURPOSE: To observe the effect of gellan gum loaded with nano-hydroxyapatite (GG/nHA) on repairing mandibular defect in rats. METHODS: Critical bone defects with 5 mm in diameter on the mandible of 16 SD rats were created and randomly divided into two groups. The bone defects in the experimental group were injected with GG/nHA and the control group were filled with absorbable gelatin sponge. The rats were sacrificed at 4 and 8 weeks after operation. The bone tissue healing was evaluated by Micro-CT. Bone tissue repairing effect was evaluated by hematoxylin-eosin (H-E) staining and Masson staining. GraphPad Prism 8.0 software package was used for statistical analysis. RESULTS: The prepared GG/nHA had a good injectability and could be delivered to the bone defect area with a syringe. Four and 8 weeks after operation, the newly formed bone and bone volume fraction (BV/TV) in the experimental group were higher than those in the control group, and the difference was statistically significant (P<0.05). Larger number of new bone were observed in the experimental group than the control group by H-E staining and Masson staining. CONCLUSIONS: GG/nHA can be injected into the mandibular defect area to promote its healing, and it is expected to be used as a novel bio-material for minimally invasive repair of oral and maxillofacial bone defects.

Key words: Mandibular defects, Hydrogel, Gellan gum, Nano-hydroxyapatite, Bone regeneration

CLC Number:

R783.1

XU Lai-jun, YUAN He, YE Qing, LI Ji-yao. Repair of mandibular defects with hydrogel loaded with nano-hydroxyapatite in rats[J]. Shanghai Journal of Stomatology, 2022, 31(5): 449-453.

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