https://publish.kne-publishing.com/index.php/fid <p><strong><em>Frontiers in Dentistry (Formerly known as :Journal of Dentistry of Tehran University of Medical Sciences (JDT))</em></strong>&nbsp;is the first Iranian dental journal in English.&nbsp;<strong><em>FD</em></strong>&nbsp;is an Open Access,&nbsp;Peer-Reviewed bimonthly journal published by Dental Research Center (DRC) of Tehran University of Medical Sciences which is a dynamic, rapidly growing research center.</p> <p>The Journal aims to publish novel and high quality relevant information written by peers to researchers and readers involved in all fields of dentistry, oral health sciences and related&nbsp;<span dir="LTR">interdisciplinaries,&nbsp;</span>strives to keep pace with the rapid growth of publications, and move on to the edge of knowledge in this field.</p> <p><strong data-stringify-type="bold">All the manuscripts should be submitted through the Journal Primary Website at <a href="https://fid.tums.ac.ir/index.php/fid/about/submissions">https://fid.tums.ac.ir/index.php/fid/about/submissions</a></strong></p> Tehran University of Medical Sciences en-US Frontiers in Dentistry 2676-296X https://publish.kne-publishing.com/index.php/fid/article/view/21770 <p><strong>Objectives: </strong>This study evaluated the effect of different surface treatments of nickel-chromium (Ni-Cr) alloy on its shear bond strength (SBS) to composite resin.</p> <p><strong>Materials and Methods: </strong>In this in vitro study, 45 Ni-Cr discs were fabricated and randomly assigned to three groups (n=15). Group 1 underwent sandblasting with 50µm aluminum oxide (Al₂O₃) particles at 60psi for 10 seconds. Group 2 was treated with Er:YAG laser (500mJ, 10Hz, 5W for 20 seconds). Group 3 received sandblasting followed by Er:YAG laser irradiation. A universal adhesive containing 10-MDP monomer was applied on all specimens, and composite resin cylinders were bonded to the treated metal surfaces. After 10,000 thermal cycles (5°C/55°C), SBS was measured using a universal testing machine. Failure modes were examined under a stereomicroscope at ×40 magnification. Data were analyzed by one-way ANOVA (alpha=0.05).</p> <p><strong>Results: </strong>Significant differences in the mean SBS was observed among the groups (P&lt;0.001). Sandblasting + Er:YAG laser exhibited the highest mean SBS (14.32±1.83MPa), which was significantly greater than that of the sandblasting group (12.73±1.62MPa; P=0.036) and the Er:YAG laser group (6.85±1.60MPa; P&lt;0.001). The sandblasting group also showed significantly higher SBS than the Er:YAG laser group (P&lt;0.001). No significant difference was found in the mode of failure among the groups (P=0.999), with mixed failure predominating in all groups.</p> <p><strong>Conclusion:</strong> Surface treatment of Ni-Cr alloy by a combination of sandblasting with Al₂O₃ particles and Er:YAG laser irradiation produced significantly higher SBS to composite resin than either sandblasting or Er:YAG laser treatment alone.</p> Seyedeh Maryam Tavangar Yousef Jahandideh Kazem Saber Reza Tayefeh Davalloo Farideh Darabi Dina Maleki Reza Ahmadi Copyright (c) 2026 Frontiers in Dentistry 2026-06-16 2026-06-16 10.18502/fid.v23i19.21770