title: Cement Thickness of Inlay Restorations Made of Lithium Disilicate, Polymer-Infiltrated Ceramic and Nano-Ceramic CAD/CAM Materials Evaluated Using 3D X-Ray Micro-Computed Tomography.
abstract: OBJECTIVE
  To evaluate the marginal and internal cement thicknesses of inlay restorations made of various CAD/CAM materials using 3D X-ray micro-computed tomography (micro-CT) technique.
  
  
  METHODS
  Caries-free extracted mandibular molars (N = 30) with similar size were randomly assigned to three groups (N = 10 per group). Mesio-occlusal-distal (MOD) cavities were prepared, and inlay restorations were obtained by milling out CAD/CAM materials namely, (a) IPS: monolithic lithium disilicate (control), (b) VE: polymer-infiltrated ceramic, and (c) CS: nano-ceramic using a CAM unit. Marginal and internal cement thicknesses were measured using 3D micro-CT. Data were analyzed using 1-way ANOVA and Tukey's tests (alpha = 0.05).
  
  
  RESULTS
  The mean marginal and internal cement thickness were not significant in all inlay materials (p > 0.05). Mean marginal cement thickness (μm) was the lowest for the IPS group (67.54 ± 10.16) followed by VE (84.09 ± 3.94) and CS (95.18 ± 10.58) (p > 0.05). The internal cement thickness (μm) was the lowest in the CS group (54.85 ± 6.94) followed by IPS (60.58 ± 9.22) and VE (77.53 ± 12.13) (p > 0.05).
  
  
  CONCLUSIONS
  Marginal and internal cement thicknesses of MOD inlays made of monolithic lithium disilicate, polymer-infiltrated ceramic, and nano-ceramic CAD/CAM materials were similar and all less than 100 μm, which could be considered clinically acceptable.
  
  
  CONCLUSIONS
  MOD inlays made of different CAD/CAM materials presented similar cement thickness, less than 100 μm.
authors: Department of Prosthodontics, Faculty of Dentistry, Zirve University, Gaziantep, Turkey.
authors: Recep
authors: R
authors: Uzgur
authors: Department of Restorative Dentistry, Faculty of Dentistry, Kırıkkale University, Kırıkkale, Turkey.
authors: Ertuğrul
authors: E
authors: Ercan
authors: Department of Prosthodontics, Faculty of Dentistry, Zirve University, Gaziantep, Turkey.
authors: Zeynep
authors: Z
authors: Uzgur
authors: Department of Restorative Dentistry, Faculty of Dentistry, Zirve University, Gaziantep, Turkey.
authors: Hakan
authors: H
authors: Çolak
authors: Department of Restorative Dentistry, Faculty of Dentistry, Inonu University, Malatya, Turkey.
authors: Muhammet
authors: M
authors: Yalçın
authors: University of Zurich, Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland.
authors: Mutlu
authors: M
authors: Özcan
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D017076:Computer-Aided Design; D003737:Dental Cavity Preparation; D003738:Dental Cements / Q000737:chemistry*; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain / Q000737:chemistry*; D006801:Humans; D021621:Imaging, Three-Dimensional; D066298:In Vitro Techniques; D007284:Inlays; D008422:Materials Testing; D008963:Molar / Q000000981:diagnostic imaging*; D049329:Nanostructures; D055114:X-Ray Microtomography
chemical_list: D003738:Dental Cements; C520133:IPS e.max CAD LT; C000621297:VITA Enamic; C493120:lithia disilicate; D003776:Dental Porcelain
keywords: CAD/CAM; cement thickness; micro-CT