title: Fracture strengths of chair-side-generated veneers cemented with glass fibers.
abstract: BACKGROUND
  CAD/CAM (computer-aided design and computer-aided manufacturing) systems have refreshed the idea of chair-side production of restorations, but the fracture of ceramic veneers remains a problem. Cementation with glass fibers may improve the fracture strengths and affect the failure modes of CAD/CAM-generated ceramic veneers. Therefore, this study compared the fracture strengths of ceramic veneers produced at chair side and cemented with or without glass fibers with those of composite veneers.
  
  
  METHODS
  Thirty intact mandibular incisors were randomly divided into three groups ( n = 10) and treated with CAD/CAM-fabricated veneers cemented with dual-cure composite resin luting cement (CRLC; Group 1), CAD/CAM-fabricated veneers cemented with a glass fiber network (GFN) and dual-cure CRLC (Group 2), and a direct particulate filler composite veneer constructed utilizing fiber and a restorative composite resin (Group 3). The specimens were tested with a universal testing machine after thermal cycling treatment.
  
  
  RESULTS
  The loads at the start of fracture were the lowest for traditionally fabricated composite veneers and higher for CAD/CAM-generated. Veneers cemented either without or with the GFN. The failure initiation loads (N) for the veneers were 798.92 for Group 1, 836.27 for Group 2, and 585.93 for Group 3. The predominant failure mode is adhesive failure between the laminates and teeth for Group 1, cohesive failure in the luting layer for Group 2, and cohesive laminate failure for Group 3, which showed chipping and small fractures.
  
  
  CONCLUSIONS
  Ceramic material is a reliable alternative for veneer construction at chair side. Fibers at the cementation interface may improve the clinical longevity and provide higher fracture strength values.
authors: S
authors: S
authors: Turkaslan
authors: Department of Prosthodontics Izmir Katip Celebi University, Faculty of Dentistry, Izmir, Turkey.
authors: B
authors: B
authors: Bagis
authors: E
authors: E
authors: Akan
authors: M M
authors: MM
authors: Mutluay
authors: P K
authors: PK
authors: Vallittu
mesh_terms: D002484:Cementation; D002516:Ceramics; D003188:Composite Resins; D017076:Computer-Aided Design; D003799:Dental Stress Analysis; D003801:Dental Veneers; D005898:Glass; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D019095:Point-of-Care Systems; D019279:Resin Cements
chemical_list: D003188:Composite Resins; C095997:DCR cement; D019279:Resin Cements; C009753:fiberglass