title: CAD/CAM glass ceramics for single-tooth implant crowns: a finite element analysis.
abstract: OBJECTIVE
  To evaluate the load distribution of CAD/CAM mono-ceramic crowns supported with single-tooth implants in functional area.
  
  
  METHODS
  A 3-dimensional numerical model of a soft tissue-level implant was constructed with cement-retained abutment to support glass ceramic machinable crown. Implant-abutment complex and the retained crown were embedded in a Ø 1.5 × 1.5 cm geometric matrix for evaluation of mechanical behavior of mono-ceramic CAD/CAM aluminosilicate and leucite glass crown materials. Laterally positioned axial load of 300 N was applied on the crowns. Resulting principal stresses in the mono-ceramic crowns were evaluated in relation to different glass ceramic materials.
  
  
  RESULTS
  The highest compressive stresses were observed at the cervical region of the buccal aspect of the crowns and were 89.98 and 89.99 MPa, for aluminosilicate and leucite glass ceramics, respectively. The highest tensile stresses were observed at the collar of the lingual part of the crowns and were 24.54 and 25.39 MPa, respectively.
  
  
  CONCLUSIONS
  Stresses induced upon 300 N static loading of CAD/CAM aluminosalicate and leucite glass ceramics are below the compressive strength of the materials. Impact loads may actuate the progress to end failure of mono-ceramic crowns supported by metallic implant abutments.
authors.affiliation: *Professor, Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey. †Post-Doc researcher, Section of Prosthodontics, Acıbadem Ataşehir Medical Surgery Center, Ataşehir, Istanbul, Turkey. ‡Assistant Professor and Chairperson, Department of Prosthodontics, Faculty of Dentistry, Ordu University, Ordu, Turkey. §Professor, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Istanbul University, Istanbul, Turkey. ‖Professor, Department of Prosthodontics, Faculty of Dentistry, Ordu University; Director-Assignee, Institute of Health Sciences, Ordu University, Ordu, Turkey.
authors.forename: Kvanç
authors.initials: K
authors.lastname: Akça
authors.forename: Yeliz
authors.initials: Y
authors.lastname: Cavusoglu
authors.forename: Elcin
authors.initials: E
authors.lastname: Sagirkaya
authors.forename: Buket
authors.initials: B
authors.lastname: Aybar
authors.forename: Murat Cavit
authors.initials: MC
authors.lastname: Cehreli
mesh_terms: D002516:Ceramics / Q000592:standards; D017076:Computer-Aided Design; D003442:Crowns; D000044:Dental Abutments / Q000592:standards; D059605:Dental Implant-Abutment Design / Q000379:methods; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design / Q000379:methods; D003799:Dental Stress Analysis; D006801:Humans; D013314:Stress, Mechanical; D013718:Tensile Strength
chemical_list: C023506:Glass ceramics