fa Bracket base remnants after orthodontic debonding ارتودنسی Orthodontics پژوهشي Research <p> <strong>Objective:</strong></p><p>  To evaluate whether the debonding procedure leads to restitutio ad integrum of the enamel surface by investigating the presence of enamel within the bracket base remnants after debonding. </p><p> <strong>Materials and Methods</strong>:</p><p>  Sixty patients who completed orthodontic treatment with fixed appliances were included. A total of 1068 brackets were microphotographed the brackets presenting some remnants on the base (n  =  818) were selected and analyzed with ImageJ software to measure the remnant area. From this population a statistically significant sample (n  =  100) was observed under a scanning electron microscope to check for the presence of enamel within the remnants. Energy dispersive x-ray spectrometry was also performed to obtain quantitative data. </p><p> <strong>Results:</strong></p><p>  Statistically significant differences in the remnant percentage between arches were observed for incisor and canine brackets (P < .0001 and P  =  .022, respectively). From a morphologic analysis of the scanning electron micrographs the bracket bases were categorized in 3 groups: group A, bases presenting a thin enamel coat (83%) group B, bases showing sizable enamel fragments (7%) group C, bases with no morphologic evidence of enamel presence (10%). Calcium presence was noted on all evaluated brackets under energy dispersive x-ray spectrometry. No significant difference was observed in the Ca/Si ratio between group A (16.21%) and group B (18.77%), whereas the Ca/Si ratio in group C (5.40%) was significantly lower than that of the other groups (P < .323 and P  =  .0001, respectively).</p><p> <strong> Conclusion</strong>:</p><p>  The objective of an atraumatic debonding is not achieved yet in some cases the damage could be clinically relevant. </p><hr><p></p><p> <strong>Source: </strong>The Angel Orthodontists</p><p> <a href="http://www.angle.org/doi/abs/10.2319/121112-930.1" target="_blank"><font color="#0000ff">Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-2026&slc_lang=fa&sid=1 Matteo Zanarini 10031947532846009503 10031947532846009503 No Department of Orthodontics, University of Bologna, Bologna, Italy Antonio Gracco 10031947532846009504 10031947532846009504 No Department of Orthodontics, University of Padova, Padova, Italy Monica Lattuca 10031947532846009505 10031947532846009505 No Department of Orthodontics, University of Ferrara, Ferrara, Italy Silvia Marchionni 10031947532846009506 10031947532846009506 No Laboratory of Microscopy, Department of Oral Sciences, University of Bologna, Bologna, Italy Maria Rosaria Gatto 10031947532846009507 10031947532846009507 No Medical Statistics, Department of Orthodontics, University of Bologna, Bologna, Italy Giulio Alessandri Bonetti giulio.alessandri@unibo.it 10031947532846009508 10031947532846009508 Yes Department of Orthodontics, University of Bologna, Bologna, Italy