title: Clinical outcome study of customized zirconia abutments for single-implant restorations.
abstract: OBJECTIVE
  This study evaluated the clinical performance of cemented customized zirconia abutments. Additionally, the marginal fit between the selected implant components was measured and the clinical gingival response was monitored.
  
  
  METHODS
  Twenty-five patients were consecutively selected for a prospective study of 30 implant-supported single-tooth restorations. Customized titanium post and zirconia abutment complexes were prepared, and scanning electron microscopy (SEM) analysis was used to study bicomponent marginal gaps. The abutments were screwed onto the implants and restored with all-ceramic crowns. Plaque and gingival indices were recorded at 6 monthly intervals over a 36- to 44-month period.
  
  
  RESULTS
  SEM analysis showed mean marginal gaps of 10.161 microm (SD: 0.7) horizontally and 4.783 microm (SD: 0.67) vertically. Abutment fractures and screw loosening were neither reported nor observed throughout the clinical observation period. Mean Plaque Index scores were 0.57 (SD: 0.32) on abutments and 0.74 (SD: 0.34) on teeth, while mean Gingival Index scores were 0.54 (SD: 0.2) on abutments and 0.72 (SD: 0.3) on teeth.
  
  
  CONCLUSIONS
  These preliminary results suggest that metallic-zirconia abutments may be comparable to currently available esthetic implant abutments.
authors.affiliation: luigicanullo@yahoo.com
authors.forename: Luigi
authors.initials: L
authors.lastname: Canullo
mesh_terms: D000328:Adult; D000368:Aged; D003442:Crowns; D000044:Dental Abutments; D019250:Dental Implants, Single-Tooth; D018772:Dental Marginal Adaptation; D003774:Dental Plaque Index; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D005260:Female; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D010512:Periodontal Index; D011446:Prospective Studies; D014025:Titanium; D016896:Treatment Outcome; D015040:Zirconium
chemical_list: D003776:Dental Porcelain; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide