Elemental analysis of calcium (Ca), silver (Ag) and silica (Si) on the specimen of the OptiBond FL group. The horizontal scales determine the distance of the scan line across the adhesive interface. The vertical scales are the relative weight value of each material. Artifactual fracture is shown between the adhesive and dentin (broken arrow). There is a slight rise in silver content in the adhesive layer. Note the high peak of Ag as demonstrated in the hybrid layer (arrow).