Fig. 1

Scanning electron microscopy images with respect to surface type. a Untreated bovine incisor at × 500 magnification; b etched bovine incisor at × 500 magnification; c primed bovine incisor at × 500 magnification; d Transbond XT adhesive at × 500 magnification; e untreated bovine incisor at × 3000 magnification; f etched bovine incisor at × 3000 magnification; g primed bovine incisor at × 3000 magnification; h Transbond XT adhesive at × 3000 magnification