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Scanning electron microscopy observation of sheared surfaces: A, mixed failure of the conventional glass ionomer cements (CGIC) group; B, mixed failure of the bacterial cellulose nanocrystal (BCNC)–modified glass ionomer cement (GIC) group; C, cohesive failure of the BCNC-modified GIC group; D, adhesive failure of the CGIC group). The area of failure is indicated with arrows.
