title: Clinical Marginal and Internal Adaptation of Maxillary Anterior Single All-Ceramic Crowns and 2-year Randomized Controlled Clinical Trial.
abstract: OBJECTIVE
  The aims of this randomized-controlled clinical trial were to compare marginal and internal adaptation of all-ceramic crowns fabricated with CAD/CAM and heat-pressed (HP) techniques before luting and to evaluate the clinical outcomes at baseline and at 6, 12, and 24 months after luting.
  
  
  METHODS
  Fifteen CAD/CAM (CC) and 15 HP all-ceramic crowns were placed in 15 patients. A silicone replica was obtained to measure marginal and internal adaptation of each all-ceramic crown before luting, and they were sectioned buccolingually and mesiodistally. Marginal and internal adaptations were measured using computerized light microscope at 40× magnification. Clinical evaluations took place at baseline (2 days after luting) and at 6, 12, and 24 months after luting. Replica scores were analyzed with Mann-Whitney U and Student's t-test (α = 0.05). Survival rate of crowns was determined using Kaplan-Meier statistical analysis.
  
  
  RESULTS
  The median marginal gap for the CC group was 132.2 μm and was 130.2 μm for the HP group. The mean internal adaptation for the CC group was 220.3 ± 51.3 μm and 210.5 ± 31 μm for the HP group. There were no statistically significant differences with respect to marginal opening (Mann-Whitney U test; p = 0.95) and internal adaptation (Student's t-test; p = 0.535) between the 2 groups. Based on modified Ryge criteria, 100% of the crowns were rated satisfactory during the 2-year period.
  
  
  CONCLUSIONS
  In this in vivo study, CAD/CAM and HP all-ceramic crowns exhibited similar marginal and internal adaptations. A 100% success rate was recorded for the 15 CAD/CAM and for the 15 HP all-ceramic crowns during the 2-year period.
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Dentistry, Ege University, İzmir, Turkey.
authors.forename: Aslı
authors.initials: A
authors.lastname: Akın
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Dentistry, Ege University, İzmir, Turkey.
authors.forename: Suna
authors.initials: S
authors.lastname: Toksavul
authors.affiliation: Department of Prosthetic Dentistry, Faculty of Dentistry, Ege University, İzmir, Turkey.
authors.forename: Muhittin
authors.initials: M
authors.lastname: Toman
mesh_terms: D017076:Computer-Aided Design; D003442:Crowns; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D006801:Humans
chemical_list: D003776:Dental Porcelain
keywords: All-ceramic; CAD/CAM; heat-pressed; internal adaptation; marginal adaptation