title: Full-Arch, Implant-Supported Monolithic Zirconia Rehabilitations: Pilot Clinical Evaluation of Wear Against Natural or Composite Teeth.
abstract: OBJECTIVE
  To clinically evaluate the amount of contact wear generated between full-arch monolithic zirconia implant-supported restorations and natural or composite antagonists, over a 1-year period.
  
  
  METHODS
  Forty-seven teeth from clinically functional, full-arch monolithic zirconia screw-retained implant prostheses (FDPs) and their antagonists were investigated. The first group ("Zirconia-E") was opposed to natural teeth ("Enamel"), whereas the other one ("Zirconia-CR") was opposed to nano-hybrid composite teeth ("Composite Resin"). Replicas of the restorations and their antagonists were obtained immediately after delivery (T0) and after 1 year of clinical service (T1). Each tooth surface was individually evaluated three-dimensionally by software to quantify the vertical distance between the two scans (Hausdorff distance), which was considered as contact wear. Data obtained for each arch were subjected to one-way ANOVA test and a post hoc analysis (Tukey's test) at a 5% level of significance. Furthermore, the influence of the location of the teeth (anterior or posterior) was analyzed. Minimum post hoc statistical power between statistically different groups was 99.6%.
  
  
  RESULTS
  Mean values were 63 ± 23 μm for Zirconia-E, 76 ± 29 μm for enamel, 70 ± 38 μm for composite resin; Zirconia-CR had a mean value of 19 ± 4 μm and significantly differed from the other groups. Contact wear between anterior and posterior teeth differed significantly only in the composite resin arch, with a mean of 39 ± 22 μm for anterior teeth versus 101 ± 19 μm for posterior ones.
  
  
  CONCLUSIONS
  Within the limitations of this preliminary evaluation, monolithic zirconia full-arch rehabilitations induced a clinically acceptable wear on natural and composite antagonists over a 1-year period; they might be considered a viable solution for implant-supported rehabilitations.
authors.affiliation: Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Cardelli
authors.affiliation: Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy.
authors.forename: Francesco Pio
authors.initials: FP
authors.lastname: Manobianco
authors.affiliation: Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Serafini
authors.affiliation: Department of Medical, Oral and Biotechnological Sciences, University "G. d'Annunzio" of Chieti-Pescara, Chieti, Italy.
authors.forename: Giovanna
authors.initials: G
authors.lastname: Murmura
authors.affiliation: Department of Prosthodontics, Geriatic Dentistry and Craniomandibular Disorders, Charité - Universitätsmedizin Berlin, Berlin, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Beuer
mesh_terms: D003188:Composite Resins; D015921:Dental Implants; D003764:Dental Materials; D006801:Humans; D057085:Tooth Wear; D015040:Zirconium
chemical_list: D003188:Composite Resins; D015921:Dental Implants; D003764:Dental Materials; D015040:Zirconium; C028541:zirconium oxide
keywords: 3D scanner; Y-TZP; attrition; contact; dental implant; prosthesis; replica; screw-retained