title: Evaluation of the marginal fit of full ceramic crowns by the microcomputed tomography (micro-CT) technique.
abstract: OBJECTIVE
  To evaluate the marginal gap (MG) and absolute marginal discrepancy (MD) of full ceramic crowns with two finish line designs, shoulder and chamfer, using microcomputed tomography (micro-CT) before and after cementation.
  
  
  METHODS
  Sixty extracted human maxillary premolar teeth were divided into two groups based on the finish line design: Group I: 90° shoulder and Group II: 135° chamfer. The specimens were further grouped based on the type of full ceramic crown they received: Group A: Feldspathic Cerec inLab ceramic system, Group B: Cerec inLab aluminum oxide ceramic system and Group C: Lithium disilicate press ceramic system. Before cementation, five crowns from each group were scanned using micro-CT in two sections, sagittal and coronal, to determine the MG and MD values for four regions of the crown (sagittal buccal, sagittal lingual, coronal mesial and coronal distal). After cementation and thermal cycling, the scanning was repeated. Measurements were obtained from 10 points for each region, 80 points totally, to evaluate the MG and MD values. Files were processed using NRecon and CTAn software. Results were statistically analyzed using one- and two-way ANOVA and Tukey HSD tests (P = 0.05).
  
  
  RESULTS
  Full ceramic systems showed clinically acceptable marginal adaptation values. The Feldspathic Cerec inLab ceramic system generally presented the lowest variance, except in the MG values of the coronal mesial region. The MG and MD values of all ceramics increased significantly after cementation, except in the shoulder preparation design (sagittal buccal region) for MG and in the chamfer preparation design (sagittal lingual region) for MD values.
  
  
  CONCLUSIONS
  Full-ceramic crowns showed clinically acceptable marginal adaptation values. The Feldspathic Cerec inLab ceramic system (Vitablocs Mark II) generally presented the lowest variance when compared with the other ceramics, except for the MG values on the mesial surface of the coronal section.
authors.affiliation: Department of Prosthodontics, Selcuk University, Konya, Turkiye.
authors.forename: Necla
authors.initials: N
authors.lastname: Demir
authors.affiliation: Department of Prosthodontics, Selcuk University, Konya, Turkiye.
authors.forename: Atiye Nilgun
authors.initials: AN
authors.lastname: Ozturk
authors.affiliation: Department of Prosthodontics, Inonu University, Malatya, Turkiye.
authors.forename: Meral Arslan
authors.initials: MA
authors.lastname: Malkoc
keywords: Full ceramic crowns; marginal fit; microcomputed tomography technique