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Abstract
Background: Studies on microleakage of Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) crowns are abundant. However many of them are inconclusive, especially those using self adhesive cements.
 Aims: To compare the microleakage between CAD/CAM crowns milled out of feldspathic ceramic and resin nano ceramics, cemented with three resin cements.
 Materials and Methods: Crown preparation was made on 54 extracted human premolars. Impressions were captured optically using CEREC 3D machine intraoral camera, and crowns were milled from feldspathic ceramic (CEREC® Blocs PC, VITA) and resin nano ceramic (Lava™ Ultimate CAD/CAM Restorative, 3M ESPE) blocks. The crowns were then cemented with three cements (n = 9); RelyX™ U200 Self-Adhesive Resin Cement (3M ESPE); NX3 Nexus ® cement with two-step etch-and-rinse adhesive (Kerr Corporation) or three/multistep etch-and-rinse resin cement, Variolink® II/Syntac Classic (Ivoclar Vivadent). The specimens were kept in water for 24 hours, thermocycled, and then soaked in methylene blue dye for 24 hours, before being sectioned mesiodistally. Microleakage was assessed using a fivepoint scale using stereomicroscope. Statistical analysis of the data was carried out using ONEWay ANOVA.
 Results: CEREC® Blocs PC crowns showed significantly less microleakage (p< 0.001) compared to Lava™ Ultimate. RelyX™ U200 showed significantly lower microleakage (p< 0.001) compared to other cements. Combination of Lava™ Ultimate crown cemented with RelyX™ U200 showed the least microleakage (p< 0.001).
 Conclusions: The microleakage scores were affected by the types of crown and cements.
 Bangladesh Journal of Medical Science Vol.18(4) 2019 p.764-772
Highlights
The demand for all ceramic restoration is in the increase due to the improvement in the properties of ceramics.[1]
In this study, the comparison of microleakage was made between the Computer-Aided Design/ ComputerAided Manufacturing (CAD/CAM) feldspathic and resin nano ceramic crowns which were cemented with self-adhesive resin cement and conventional resin cements
Twenty seven crowns were milled using ceramic blocks, CEREC® Blocs PC, shade S2, size 12, (VITA Zahnfabrik Germany) and twenty seven crowns were milled from resin nano ceramic blocks, LavaTM Ultimate CAD/ CAM Restorative for CEREC Blocs, size 12, shade A2
Summary
The demand for all ceramic restoration is in the increase due to the improvement in the properties of ceramics.[1]. Microleakage of CAD/CAM crowns with resin cements (LavaTM Ultimate, 3M ESPE, St. Paul, MN) is a mix of composite and ceramic in which it contains zirconia nanoparticles. For teeth to be cemented with NX3 Nexus ® (Kerr Corporation, USA), etching was done on the dentine surface for 15 seconds with 37% phosphoric acid, washed with water spray, before being gently sprayed dried with air. This was followed by the application of Optibond Solo Plus (Batch Number 4702096, Kerr Corporation, USA) with a micro brush before being light cured for 15 seconds. Ethical clearance: The study was obtained from the research and ethical committee of the institution
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