Microleakage of Lithium Disilicate Ceramic Crowns and Nano Ceramic Crowns: A Comparative Study.
Alzayer, Ahmad.
2016
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Abstract: Aim and Hypothesis The aim of this study was to evaluate and compare the microleakage of CAD/CAM crowns made of nano ceramics (CERASMART, GC, Tokyo, Japan) and lithium disilicate ceramics (IPS e.max, Ivoclar Vivadent AG, Liechtenstein) on extracted teeth after thermocycling testing. It was hypothesized that lithium disilicate crowns would have lower microleakage values compared to nano ... read moreceramic ones. Materials and Method Thirty extracted human third molar teeth were prepared in a consistent way to receive full-coverage CAD/CAM crowns. The specimens were scanned, planed, and then designed using the CEREC system. The crowns were fabricated from CERASMART CAD/CAM blocks and IPS e.max CAD blocks using a CEREC milling machine. The specimens were randomly distributed into two groups. The crowns of both groups were cemented using RelyX Ultimate resin cement. All crowns were subjected to 10,000 thermocycles and then immersed in silver nitrate followed by using a photo-developer. Specimens were segmented buccolingually and the microleakage was measured at 1.0 magnification using a stereomicroscope. The percentage on the microleakage scale was calculated based on the buccal and lingual surfaces, and this percentage was used in the statistical analysis. For the ordinal microleakage scale, results of the buccal and lingual surfaces were kept separate, and both were included in the statistical analysis. Results For the continuous percentage data, the CERASMART group showed lower median microleakage at 5.9% (IQR=20.7) than the e.max group, which showed a median microleakage of 7.4% (IQR=13.9). No statistically significant difference between the groups was found (p = 0.806). For the ordinal data, there was no statistically significant difference between the groups (p = 0.605). Conclusion Within the limitations of this study, no proven evidence showed a systematic difference when comparing the microleakage of lithium disilicate crowns and nano ceramic crowns.
Thesis (M.S.)--Tufts University, 2016.
Submitted to the Dept. of Posthodontics.
Advisor: Ala Ali.
Committee: Matthew Finkelman, Marcelo Suzuki, and Vasiliki Tsakalelli.
Keyword: Dentistry.read less - ID:
- 0v838b657
- Component ID:
- tufts:20232
- To Cite:
- TARC Citation Guide EndNote
