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 .
New protective polish effects on shear bond strength of brackets.
One of the solutions for the problem of white spot lesions has been the application of a polymer coating to the labial enamel surface . The aim of this study is to find out whether the liquid polish BisCover affects the bond strength of brackets bonded with a light-cured system ( Transbond XT ) and a no-mix system ( Unite ) . St and ard stainless steel premolar brackets were bonded to 100 permanent human premolars r and omly divided into five equal groups . Two different enamel surface conditions were studied : dry and varnished with BisCover . For each enamel surface condition , two orthodontic adhesive systems were used : a light-cured system ( Transbond XT ) and a no-mix system ( Unite ) . All teeth were conditioned with 37 % phosphoric acid for 30 seconds , followed by thorough washing and drying . The teeth in groups 1 and 2 were bonded with Transbond XT and Unite , respectively . For groups 3 , 4 , and 5 , a thin layer of BisCover was applied to the etched enamel with a brush and light cured for 15 seconds . In group 3 , a thin layer of Transbond XT primer was applied , whereas in group 5 , no additional primer was used on BisCover . In groups 3 and 5 , the brackets were bonded with Transbond XT adhesive resin . Group 4 was bonded with no-mix Unite . Shear forces were applied to the sample s by a Zwick Universal test machine , and bond strengths measured in megapascals . The results revealed that shear bond strengths of the groups did not differ significantly from each other
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 .