Chitosan is a cationic biopolymer and its modification as a nanoparticle, as well as loading a corticosteroid on it, may enhance its bone regenerative effect. The aim of this study was to investigate the bone regenerative effect of nanochitosan with or without dexamethasone.
Under general anesthesia, four cavities were created in the calvarium of 18 rabbits and filled with either nanochitosan, nanochitosan with a temporally-controlled release of dexamethasone (nanochitosan+dexamethasone), an autograft, or left unfilled (control). The defects were then covered with a collagen membrane. The rabbits were randomly divided into 2 groups and were sacrificed at 6 or 12 weeks post-surgery. The new bone type, osteogenesis pattern, foreign body reaction, as well as the type and severity of the inflammatory response were evaluated histologically. The amount of new bone was determined using histomorphometry and cone-beam computed tomography (CBCT). A one-way ANOVA with repeated-measures was performed to compare results between the groups at each interval. A T-test and Chi-square were also conducted to analyze changes in variables between the two intervals.
Nanochitosan and the combination of nanochitosan and dexamethasone significantly increased the combination of woven and lamellar bone (P=0.007). No sample showed a foreign body reaction or any acute or severe inflammation. Chronic inflammation was significantly decreased in number (P=0.002) and severity (P=0.003) over time. There was no significant difference between the extent and pattern of osteogenesis amongst the four groups, as evaluated by histomorphometry and CBCT at each interval.
Nanochitosan and nanochitosan+dexamethasone were comparable to the gold standard of autograft regarding the type and severity of inflammation, as well as the level and pattern of osteogenesis, yet they induced more woven and lamellar bone.
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Accepted: March 2, 2023
Received in revised form: January 18, 2023
Received: November 12, 2022
Publication stageIn Press Accepted Manuscript
© 2023 Published by Elsevier Inc. on behalf of American Association of Endodontists.