en Prosthodontics Prosthodontics Original article Original article <div style="text-align: justify;"><span style="font-size:13pt"><span style="line-height:105%"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#2e74b5">Background and Aim</span></span></span></span></b><b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#2e74b5">:</span></span></span></span></b> <span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana="">Several studies have investigated the effect of addition of fillers on mechanical strength of denture base materials. This study aimed to evaluate the mechanical properties of heat-cure denture base materials incorporated with different concentrations of zirconia nanotubes (ZNTs).</span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="line-height:105%"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#2e74b5">Materials and Methods: </span></span></span></span></b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana="">In this in vitro study, 90 specimens were fabricated from each denture base resin material (Trevlon and DPI) and divided into three groups (n=30) based on the mechanical properties to be tested (flexural strength, impact strength, and surface hardness). Thirty specimens in each group were further subdivided into 5 subgroups (n=6) based on the weight percentage (wt%) of ZNTs (0.0wt%, 0.5wt%, 1.0wt%, 2.0wt%, and 5.0wt%). The specimens were subjected to flexural strength, impact strength, and surface hardness testing using a universal testing machine, IZOD impact testing machine, and Vickers hardness tester, respectively. One-way ANOVA and post-hoc tests were used for statistical analyses (alpha=0.05).</span></span></span>&nbsp;</span></span></span><br> <span style="font-size:13pt"><span style="line-height:105%"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#2e74b5">Results: </span></span></span></span></b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#0e101a">The maximum flexural strength was observed following the inclusion of 2.0wt% and 1.0wt% ZNTs in Trevlon and DPI, respectively. The maximum impact strength was obtained with the addition of 1.0wt% ZNTs to both Trevlon and DPI. The surface hardness of Trevlon and DPI increased significantly with an increase in the concentration of ZNTs (P=0.005). Flexural strength (P=0.000) and surface hardness (P=0.005) were significantly different among various concentrations of Trevlon and DPI, but the impact strength (P=0.013) was significantly different only in DPI.</span></span></span></span><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:"Verdana",sans-serif"></span></span></span></span></span></span><br> <span style="font-size:13pt"><span style="line-height:105%"><span new="" roman="" style="font-family:" times=""><b><span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#2e74b5">Conclusion:</span></span></span></span></b> <span style="font-size:9.0pt"><span style="line-height:105%"><span style="font-family:" verdana=""><span style="color:#0e101a">The optimal concentration of ZNTs to obtain enhanced mechanical properties of denture base resins was found to be 1.0wt%.</span></span></span></span></span></span></span><br> &nbsp;</div> Flexural Strength, Hardness, Polymethyl Methacrylate, Zirconium Oxide 40 50 http://jrdms.dentaliau.ac.ir/browse.php?a_code=A-10-1552-1&slc_lang=en&sid=1 Vamsee Priya Golla vamseepriyayadav.golla@vdc.edu.in 100319475328460013982 100319475328460013982 No Department of Prosthodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India Satyanarayana Raju Mantena satya@vdc.edu.in 100319475328460013983 100319475328460013983 No Department of Prosthodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India Rama Krishna Alla ramakrishna.a@vdc.edu.in 100319475328460013984 100319475328460013984 Yes Department of Dental Materials, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India Vineeth Guduri guduri.vineeth@vdc.edu.in 100319475328460013985 100319475328460013985 No Department of Prosthodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India Suresh Sajjan MC sureshsajjanmc@vdc.edu.in 100319475328460013986 100319475328460013986 No Department of Prosthodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India Bheemalingeswara Rao D bheemalingeswararao29@gmail.com 100319475328460013987 100319475328460013987 No Department of Prosthodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India Deepika Kandukuri deepikakandukuri@vdc.edu.in 100319475328460013988 100319475328460013988 No Department of Prosthodontics, Vishnu Dental College, Bhimavaram, Andhra Pradesh, India