Fig. 2

Comparison of conventional orthodontic bonding systems. a Shear bond strength, b ARI and c rate of enamel fractures of orthodontic attachments bonded to bovine incisors with Transbond XT™ (TB XT, n = 20), BrackFix® (n = 20), Grengloo™ (n = 20) and the glass ionomer luting cement Meron (n = 20). a Shear bond strength of TB XT, BrackFix® and Grengloo™ were in a clinically adequate range, whereas Meron served as a zero control. b Mean ARI-scores were between 4 and 5. c Enamel fractures were observed in Grengloo™ (50%) and Meron (15%). Data shown as mean ± SEM or as relative frequency; statistically significant differences (p ≤ 0.05) are marked with *