title: Evaluation of biogeneric design techniques with CEREC CAD/CAM system.
abstract: OBJECTIVE
  The aim of this study was to evaluate occlusal contacts generated by 3 different biogeneric design modes (individual (BI), copy (BC), reference (BR)) of CEREC software and to assess the designs subjectively.
  
  
  METHODS
  Ten pairs of maxillary and mandibular casts were obtained from full dentate individuals. Gypsum cast contacts were quantified with articulating paper and digital impressions were taken. Then, all ceramic crown preparation was performed on the left first molar teeth and digital impressions of prepared teeth were made. BI, BC, and BR crowns were designed. Occlusal images of designs including occlusal contacts were superimposed on the gypsum cast images and corresponding contacts were determined. Three designs were evaluated by the students.
  
  
  RESULTS
  The results of the study revealed that there was significant difference among the number of contacts of gypsum cast and digital models (P<.05). The comparison of the percentage of virtual contacts of three crown designs which were identical to the contacts of original gypsum cast revealed that BI and BR designs showed significantly higher percentages of identical contacts compared with BC design (P<.05). Subjective assessment revealed that students generally found BI designs and BR designs natural regarding naturalness of fissure morphology and cusp shape and cusp tip position. For general occlusal morphology, student groups generally found BI design "too strong" or "perfect", BC design "too weak", and BR design "perfect".
  
  
  CONCLUSIONS
  On a prepared tooth, three different biogeneric design modes of a CAD/CAM software reveals different crown designs regarding occlusal contacts and morphology.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Yeliz
authors.identifier: 0000-0002-0688-0745
authors.initials: Y
authors.lastname: Arslan
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Seçil
authors.identifier: 0000-0001-8836-0673
authors.initials: S
authors.lastname: Karakoca Nemli
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Merve
authors.identifier: 0000-0002-4002-6390
authors.initials: M
authors.lastname: Bankoğlu Güngör
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Evşen
authors.identifier: 0000-0002-3696-6734
authors.initials: E
authors.lastname: Tamam
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Handan
authors.identifier: 0000-0001-5809-7018
authors.initials: H
authors.lastname: Yılmaz
keywords: Crowns; Dental occlusion; Dental prosthesis design
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