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CATEGORY: ORIGINAL RESEARCH
Year : 2020  |  Volume : 20  |  Issue : 5  |  Page : 18-19

A comparative Evaluation of the Translucencies of Three Commercially Available Brands Of Translucent Zirconia Ceramic Systems with a Conventional Lithium Disilicate Ceramic System – An In-Vitro Study


Prosthodontist

Date of Web Publication8-Jan-2021

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-4052.306345

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How to cite this article:
Mopkar MA. A comparative Evaluation of the Translucencies of Three Commercially Available Brands Of Translucent Zirconia Ceramic Systems with a Conventional Lithium Disilicate Ceramic System – An In-Vitro Study. J Indian Prosthodont Soc 2020;20, Suppl S1:18-9

How to cite this URL:
Mopkar MA. A comparative Evaluation of the Translucencies of Three Commercially Available Brands Of Translucent Zirconia Ceramic Systems with a Conventional Lithium Disilicate Ceramic System – An In-Vitro Study. J Indian Prosthodont Soc [serial online] 2020 [cited 2021 Jan 28];20, Suppl S1:18-9. Available from: https://www.j-ips.org/text.asp?2020/20/5/18/306345



Introduction: Unlike PFM crowns, all ceramic restorations allow greater light transmission thus improving the optical properties and colour and can hence be used successfully in aesthetically demanding areas. The quest for an esthetic material with superior mechanical properties has led to the development of Yttria – Stabilized Tetragonal Zirconia Polycrystal (Y-TZP) ceramic for dental application. The opacity of zirconia is a disadvantage as its contrasting appearance against adjacent natural teeth could be pronounced. In order to match the optical properties of the adjacent teeth, the underlying zirconia copings are layered with a more translucent ceramic like lithium disilicate. With the objective of improving their transmittance, translucent varieties of zirconia have been developed to enable its use. These materials are more translucent than conventional zirconia and have superior flexural strength compared to lithium disilicate ceramics.

Methodology: Four groups of materials were processed and tested in this study: Group 1(Control Group) - IPS e.max Medium Opacity (Ivoclar Vivadent), Group 2- Ceramill 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.






 

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