Evaluation of Chitosan-Oleuropein Nanoparticles on the Durability of Dentin Bonding

Overview

Journal Drug Des Devel Ther

Specialty Pharmacology

Date 2023 Jan 30

PMID 36712950

Authors

Shuya Zhao

Yunyang Zhang

Yun Chen

Xianghui Xing

Yu Wang

Guofeng Wu

Affiliations

Soon will be listed here.

Abstract

Purpose: To evaluate the effects of dentin pretreatment with chitosan-loaded oleuropein nanoparticles (CONPs) on the durability of resin-dentin bonding interfaces.

Methods: Eighty freshly extracted non-carious human third molars were randomly divided into four groups (n = 20 each): a de-ionized water (DW) group, a chitosan (CS) group, a chlorhexidine (CHX) group and a CONP group. The dentin in the DW, CS, CHX, and CONP groups were pretreated with de-ionized water, 1.0 mg/L CS solution, 2% chlorhexidine solution, and CONP suspension (prepared with 100 mg/L oleuropein), respectively, followed by the universal adhesive and resin composites. The bonded teeth of each group were randomly divided into two subgroups: an immediate subgroup and an aged subgroup. The bonded teeth of each group were then cut into the bonded beams. We measured their microtensile bond strength (μTBS), observed the characteristics of bonding interface by atomic force microscope, calculated the percentage of silver particles in a selected area for interfacial nanoleakage analysis, and evaluated the endogenous gelatinase activity within the bonding interface for in-situ zymogram analysis. Data were analyzed with two-way ANOVA and LSD multiple comparison test ( < 0.05).

Results: Regardless of after 24 h or after thermocycling, CONP exhibited better μTBS ( < 0.05) than the other three groups except that there was not a statistical significance ( > 0.05) in the CONP and CHX groups after 24 h. Besides, the CONP group presented significantly higher modulus of elasticity in the hybrid layers ( < 0.05), lower expression of nanoleakage ( < 0.05), and better inhibitory effect of matrix metalloproteinases than the other three groups before and after thermocycling.

Conclusion: Altogether, the CONPs had the potential to act as a dentin primer, which could effectively improve the dentin-resin binding durability.

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