Effect of sandblasting with different size of aluminum oxide particles on tensile bond strength of resilient liner to denture base

Abstract

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mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} </style> <![endif]--> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 1cm; line-height: 200%;"><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Objectives: </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">The purpose of this study was to investigate the bonding properties of </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">sandblasted with different size of aluminum oxide particles denture base to silicone based soft denture liner. </span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 1cm; line-height: 200%;"><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Methods: Polymethyl methacrylate (PMMA) test specimens were fabricated and then randomly assigned to 5 groups (<em>n</em>=15), according to the treatments applied, untreated (control, group 1), sandblasted with 50 µm Al₂O₃ (group 2), 60 µm Al₂O₃ (group 3), 120 µm Al₂O₃ (group 4), and 250 µm Al₂O₃ (group 5). </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">The resilient liner specimens were processed between 2 PMMA blocks. </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Bonding strength of the liners to PMMA was compared by tensile test with the use of universal testing machine at a crosshead speed of 5 mm/min. The mean value and standard deviation of the specimens were statistically evaluated by 1-way ANOVA and post hoc Tukey-Kramer multiple comparisons tests (α=0.05).</span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 1cm; line-height: 200%;"><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Results: The highest mean force value was observed in group 4 specimens, and the lowest mean force value was observed in group 2 specimens. The differences between groups 1 and 4 was found to be statistically significant (<em>p</em>=0.001). Nevertheless, there was no statistical difference in tensile bond strength between groups 1 (control) and groups 2, 3, and 5 specimens.</span></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 1cm; line-height: 200%;"><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Conclusion: Different particle sizes of aluminum oxide particles affect the bond strength of </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">PMMA/resilient liner. Furthermore, 120 </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">µm Al₂O₃ particles are the best particle size to </span><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">improve strength of the bond. </span><strong></strong></p> <p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align: justify; text-indent: 1cm; line-height: 200%;"><strong><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Keywords: </span></strong><span style="font-size: 12pt; line-height: 200%; font-family: " lang="EN-US">Sandblasting, tensile bond strength, soft liner, aluminum oxide.</span></p>