Bacterial cellulose nanocrystal modified glass ionomer cements increase microshear bond strength of dentin structure

Various modifications in the formulation of glass ionomer cement (GICs) have been made in order to improve the clinical performance of these restorations. The aim of this work was to evaluate the microleakage and micro shear bond strength (μSBS) of bacterial cellulose nanocrystal (BCNC)–modified glass ionomer cement (GIC) restorations in the primary dentition.

A total number of 60 freshly extracted primary molar teeth were selected. Half of the samples were used for μSBS testing (in 2 groups, n = 15). In group 1, conventional GIC (CGIC) of Fuji IX (GC) was placed in cylindrical moulds on dentinal surfaces. In group 2, CGIC of Fuji IX containing 1% wt of BCNCs was used. μSBS was evaluated using a universal testing machine. In another part of the study, microleakage of class V restorations was assessed according to the mentioned groups (n = 15). The sectioned samples were observed under a stereomicroscope, and microleakage scores were recorded. SPSS version 16.0 (SPSS), independent samples t-test, and Mann–Whitney U test was used for statistical analysis at a significance level of P < .05.

Results:

• Results showed statistically significant differences between the μSBS of CGIC and modified GIC groups (P < .0001).
• The BCNC-modified GIC group recorded significantly higher bond strength values
• Also, microleakage scores of CGIC and BCNC-modified GIC restorations were not significantly different (P = .57).

Thus, based on the findings, it was concluded that incorporating bacterial cellulose nanocrystals (1% wt) into the conventional glass ionomer cements of Fuji IX significantly increased the microshear bond strength (μSBS) to the dentin structure of the primary teeth.

Reference:

Najmeh Mohammadi, Zahra Fattah, Lida Vaziri Borazjani. Nano-cellulose Reinforced Glass Ionomer Restorations: An In Vitro study. International Dental Journal, 2022, ISSN 0020-6539,

https://doi.org/10.1016/j.identj.2022.07.013