fa Evaluation of shear bond strength of orthodontic brackets bonded with nano-filled composites ارتودنسی Orthodontics پژوهشي Research <p> <strong>Objectives:</strong> </p><p> The purpose of this study was to evaluate the shear bond strength (SBS) of orthodontic brackets bonded with two types of nano-composites in comparison to a conventional orthodontic composite. </p><p> <strong>Materials and Methods</strong>:</p><p>  Sixty extracted human first premolars were randomly divided into 3 groups each containing 20 teeth. In group I, a conventional orthodontic composite (Transbond XT) was used to bond the brackets, while two nano-composites (Filtek TM Supreme XT and AELITE Aesthetic Enamel) were used in groups II and III respectively. The teeth were stored in distilled water at 37°C for 24 hours, thermocycled in distilled water and debonded with a universal testing machine at a crosshead speed of 1 mm/min. The adhesive remnant index (ARI) was also evaluated using a stereomicroscope.</p><p> <strong> Results</strong>:</p><p>  AELITE Aesthetic Enamel nano-composite revealed a SBS value of 8.44±2.09 MPa, which was higher than Transbond XT (6.91± 2.13) and Filtek TM Supreme XT (6.04± 2.01). Statistical analysis revealed a significant difference between groups II and III (P < 0.05). No significant difference was found between groups I and III, and between groups I and II (P > 0.05). Evaluation of ARI showed that Transbond XT left fewer adhesive remains on teeth after debonding. </p><p> <strong>Conclusion</strong>:</p><p>  Results of this study indicate that the aforementioned nano-composites can be successfully used for bonding orthodontic brackets. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dentistry of Tehran University of Medical Science</p><p><a href="http://jdt.tums.ac.ir/index.php/jdt/article/view/1683.pdf" target="_blank"><font color="#0000ff"> Full Text</font></a></p> Shear; Bond Strength; Nano; Composite 0 0 http://idai.ir/browse.php?a_code=A-10-32-2658&slc_lang=fa&sid=1 Javad Chalipa 100319475328460012518 100319475328460012518 No Dental Research Center and Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran Mohammad Sadegh Ahmad Akhoundi ahmadakh@tums.ac.ir 100319475328460012519 100319475328460012519 Yes Dental Research Center, Dentistry Research Institute, Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran Sepideh Arab 100319475328460012520 100319475328460012520 No Department of Orthodontics, Qazvin University of Medical Sciences, Qazvin, Iran Mohammad Javad Kharazifard 100319475328460012521 100319475328460012521 No Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran Maryam Ahmadyar 100319475328460012522 100319475328460012522 No Tehran, Iran