Many studies on in-vitro orthodontic bond strength fail to report test conditions that could significantly affect their outcomes
INTRODUCTION The aims of this study were to systematic ally review the available literature regarding in-vitro orthodontic shear bond strength testing and to analyze the influence of test conditions on bond strength .
Influence of cross-head speed in orthodontic bond strength testing.
OBJECTIVE The aim of this study was to investigate the influence of cross-head speed on debonding force of orthodontic brackets . METHODS One hundred and twenty extracted permanent bovine m and ibular incisors were r and omly divided into 4 groups of 30 specimens each . Teeth were bonded with stainless steel orthodontic brackets . Enamel surfaces were etched with 37 % phosphoric acid for 30 seconds and bonded with a composite adhesive .  Debonding force measurements were performed with a universal testing machine Zwicki Z 2.5 ( Zwick , Germany ) . Cross-head speeds of the four groups were : 0.1 mm s-1 ( group A ) , 0.5 mm s-1 ( group B ) , 1.0 mm s-1 ( group C ) , 5.0 mm s-1 ( group D ) . RESULTS Mean debonding force measurements were as follows : 215.35 ( 39.09 ) N ( group A ) , 231.79 ( 48.62 ) N ( group B ) , 236.64 ( 39.26 ) N ( group C ) , 224.95 ( 34.67 ) N ( group D ) . Analysis of variance indicated that there were no significant differences in debonding forces between the groups investigated . The adhesive remnant index showed a median value of 2.0 for all groups . SIGNIFICANCE Cross-head speed variation between 0.1 and 5 mm min-1 does not seem to influence debonding force measurements or failure mode of brackets bonded to enamel with a composite adhesive
Many studies on in-vitro orthodontic bond strength fail to report test conditions that could significantly affect their outcomes
INTRODUCTION The aims of this study were to systematic ally review the available literature regarding in-vitro orthodontic shear bond strength testing and to analyze the influence of test conditions on bond strength .