Comparative evaluation of tear strength and surface roughness of two maxillofacial silicone materials following disinfection: an invitro study

The Journal of Indian Prosthodontic Society | Volume 20 | Supplement 1 | December 2020 S19 Methodology: Four groups of materials were processed and tested in this study: Group 1(Control Group) IPS e.max Medium Opacity (Ivoclar Vivadent), Group 2Ceramill Zolid HT (Amann Girrbach), Group 3 Lava 3M ESPE Premium, Group 4 Weiland Zenostar (Ivoclar Vivadent). A total of 40 discs measuring 15mm in diameter and 1mm in thickness were prepared with each group consisting of 10 discs each. The translucencies of the specimens were determined by calculating the contrast ratio. Data was recorded using a spectrophotometer. The contrast ratios were calculated using the following equation:CR=Yb/Yw. Result: The median CR value was the highest for Group 2 followed by Group 4, Group 3 and Group 1 in that order. In general, lithium disilicate was found to be more translucent than all the tested brands of translucent zirconia. Conclusion: 1.All the translucent zirconia systems were less translucent than Lithium Disilicate. 2. Lava Plus HT and ZENOStar were found to be more translucent than Ceramill Zolid. 3. There was no statistically significant difference between the translucencies of Lava Plus HT and ZENOStar. DOI: 10.4103/0972-4052.306345 Comparative evaluation of tear strength and surface roughness of two maxillofacial silicone materials following disinfection: an invitro study