Volume : 6, Issue : 9, September - 2017

COMPARATIVE EVALUATION OF THE VICKERS MICRO HARDNESS AND DEPTH OF CURE OF SELECTED DENTAL COMPOSITES - An In vitro study

Dr Anupama S Gopinathan, Dr Jeeva P P, Dr. Vinayakumar T

Abstract :

<p>&nbsp;<b style="text-align: justify;"><span style="font-size:12.0pt;line-height:&#10;200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">Aims and objectives</span></b></p> <p class="MsoNoSpacing" style="text-align:justify;line-height:200%"><span style="font-size:12.0pt;line-height:200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The current invitro study evaluated Vickers microhardness (VH) and depth of cure (DC) of selected dental composite resins polymerized with either a commercial halogen LCU or LED, LCU respectively.<o:p></o:p></span></p> <p class="MsoNoSpacing" style="text-align:justify;line-height:200%"><b><span style="font-size:12.0pt;line-height:&#10;200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">Materials and Methods<o:p></o:p></span></b></p> <p class="MsoNoSpacing" style="text-align:justify;text-indent:.5in;line-height:&#10;200%"><span style="font-size:12.0pt;line-height:200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">Five dental composite resins were selected for measuring VH (Spectrum TPH, Filtek ^TMP60, Z₁₀₀, Chitra dual cure, Chitra radioopaque light cure). Four resin composites were investigated for depth of cure measurement. The VH of the surface was determined with a microhardness tester &nbsp;(HMV 2000 SHIMADZU) using a Vickers diamond indenter and a 1kg load applied for 20 sec. Depth of cure was measured using the digimatic calipers.<o:p></o:p></span></p> <p class="MsoNoSpacing" style="text-align:justify;line-height:200%"><b><span style="font-size:12.0pt;line-height:&#10;200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">Results<o:p></o:p></span></b></p> <p class="MsoNoSpacing" style="text-align:justify;line-height:200%"><span style="font-size:12.0pt;line-height:200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The results were compared statistically using one way ANOVA for VH. All samples showed statistically significant higher VH values for LED LCU &nbsp;except Z₁₀₀ which exhibited no difference. &nbsp;The mean values were taken into consideration for depth of cure. All samples except Z₁₀₀showed higher mean value for LEDLCU.<o:p></o:p></span></p> <p class="MsoNoSpacing" style="text-align:justify;line-height:200%"><b><u><span style="font-size:12.0pt;&#10;line-height:200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">Conclusion<o:p></o:p></span></u></b></p> <p class="MsoNoSpacing" style="text-align:justify;line-height:200%"><span style="font-size:12.0pt;line-height:200%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In summary VH and DC of samples cured with Halogen LCU and LED LCU exceeded the values required by ISO standards, manufacturers specifications and clinical demands.<o:p></o:p></span></p>