title: Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays.
abstract: OBJECTIVE
  To evaluate marginal adaptation, fracture load and failure types of CAD/CAM polymeric inlays.
  
  
  METHODS
  Standardized prepared human molars (48) were divided into four groups (n=12): (A) PCG (positive control group); adhesively luted glass-ceramic inlays, (B) TRX; CAD/CAM polymeric inlays luted using a self-adhesive resin cement, (C) TAC; CAD/CAM polymeric inlays luted using a conventional resin cement, and (D) NCG (negative control group); direct-filled resin-based composite restorations. All specimens were subjected to a chewing simulator. Before and after chewing fatigue, marginal adaptation was assessed at two interfaces: (1) between dental hard tissues and luting cement and (2) between luting cement and restoration. Thereafter, the specimens were loaded and the fracture loads, as well as the failure types, were determined. The data were analysed using three- and one-way ANOVA with post hoc Scheffé test, two sample Student's t-test (p<0.05).
  
  
  RESULTS
  Before and after chewing fatigue, marginal adaptation for interface 1 showed significantly better results for TRX and PCG than for TAC (p=0.001-0.02) and NCG (p=0.001-0.047). For interface 2, marginal adaptation for TAC was significantly inferior to TRX (p<0.001) and PCG (p<0.001). Chewing fatigue had a negative impact on the marginal adaptation of TAC and NCG. No significant differences in fracture load were found between all tested groups.
  
  
  CONCLUSIONS
  Self-adhesive luted polymeric CAD/CAM inlays showed similar marginal adaptation and fracture load values compared to adhesively luted glass-ceramic inlays.
authors.affiliation: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
authors.forename: Andreas
authors.initials: A
authors.lastname: Ender
authors.affiliation: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
authors.forename: Stefan
authors.initials: S
authors.lastname: Bienz
authors.affiliation: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
authors.forename: Werner
authors.initials: W
authors.lastname: Mörmann
authors.affiliation: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
authors.forename: Albert
authors.initials: A
authors.lastname: Mehl
authors.affiliation: Clinic of Preventive Dentistry, Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland.
authors.forename: Thomas
authors.initials: T
authors.lastname: Attin
authors.affiliation: Department of Prosthodontics, Munich Dental School, Goethestrasse 70, 80336 Munich, Germany. Electronic address: bogna.stawarczyk@med.uni-muenchen.de.
authors.forename: Bogna
authors.initials: B
authors.lastname: Stawarczyk
mesh_terms: D000538:Aluminum Silicates; D002516:Ceramics / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D017076:Computer-Aided Design; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D066298:In Vitro Techniques; D007284:Inlays; D008409:Mastication; D008963:Molar; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; C474035:Filtek Supreme; C075815:IPS-Empress ceramic; D019279:Resin Cements; C588379:artBloc Temp; C000621296:artCEM GI; D003776:Dental Porcelain; C103502:Variolink; C023506:Glass ceramics; D019904:Polymethyl Methacrylate
keywords: Fracture load; Fracture types; Glass–ceramic CAD/CAM inlays; Marginal adaptation; Unfilled PMMA-based CAD/CAM inlays