Fig. 2

Proportional dye penetration (PDP) for five adhesive systems (resin-based composite materials: GC – GC OrthoConnect, LB – Light Bond, TB – Transbond XT, TL – TrulockTM Light and resin-reinforced glass ionomer cement: GCO – GC Fuji Ortho LC) as predicted by a generalized linear mixed model containing the adhesive as a predictor. PDP is measured as the sum of proportions from both the occlusal and gingival margins of the bracket. The shaded areas indicate 95% confidence intervals