title: In Vitro Implant Impression Accuracy Using a New Photopolymerizing SDR Splinting Material.
abstract: OBJECTIVE
  The study aims to evaluate three-dimensionally (3D) the accuracy of implant impressions using a new resin splinting material, "Smart Dentin Replacement" (SDR).
  
  
  METHODS
  A titanium model of an edentulous mandible with six implant analogues was used as a master model and its dimensions measured with a coordinate measuring machine. Before the total 60 impressions were taken (open tray, screw-retained abutments, vinyl polysiloxane), they were divided in four groups: A (test): copings pick-up splinted with dental floss and fotopolymerizing SDR; B (test): see A, additionally sectioned and splinted again with SDR; C (control): copings pick-up splinted with dental floss and autopolymerizing Duralay® (Reliance Dental Mfg. Co., Alsip, IL, USA) acrylic resin; and D (control): see C, additionally sectioned and splinted again with Duralay. The impressions were measured directly with an optomechanical coordinate measuring machine and analyzed with a computer-aided design (CAD) geometric modeling software. The Wilcoxon matched-pair signed-rank test was used to compare groups.
  
  
  RESULTS
  While there was no difference (p = .430) between the mean 3D deviations of the test groups A (17.5 μm) and B (17.4 μm), they both showed statistically significant differences (p < .003) compared with both control groups (C 25.0 μm, D 19.1 μm).
  
  
  CONCLUSIONS
  Conventional impression techniques for edentulous jaws with multiple implants are highly accurate using the new fotopolymerizing splinting material SDR. Sectioning and rejoining of the SDR splinting had no impact on the impression accuracy.
authors.affiliation: Department of Prosthodontics, Dental School, University of Padova, Padova, Italy.|Mechatronics and Product Innovation Engineering, Department of Management and Engineering, University of Padova, Padova, Italy.
authors.forename: Adolfo
authors.initials: A
authors.lastname: Di Fiore
authors.affiliation: Departments of Civil, Environmental and Architectural Engineering, University of Padova, Padova, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Meneghello
authors.affiliation: Departments of Civil, Environmental and Architectural Engineering, University of Padova, Padova, Italy.
authors.forename: Gianpaolo
authors.initials: G
authors.lastname: Savio
authors.affiliation: Departments of Oral Surgery, Dental School, University of Padova, Padova, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Sivolella
authors.affiliation: Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.|Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine, Philadelphia, PA, USA.
authors.forename: Joannis
authors.initials: J
authors.lastname: Katsoulis
authors.affiliation: Dental School, University of Padova, Padova, Italy.
authors.forename: Edoardo
authors.initials: E
authors.lastname: Stellini
mesh_terms: D003188:Composite Resins / Q000627:therapeutic use*; D017076:Computer-Aided Design; D003760:Dental Impression Materials / Q000627:therapeutic use*; D003761:Dental Impression Technique / Q000295:instrumentation; D017267:Dental Prosthesis Design / Q000379:methods; D006801:Humans; D021621:Imaging, Three-Dimensional; D066298:In Vitro Techniques; D008768:Methylmethacrylates / Q000627:therapeutic use; D058105:Polymerization / Q000528:radiation effects; D012117:Resins, Synthetic / Q000627:therapeutic use
chemical_list: D003188:Composite Resins; D003760:Dental Impression Materials; D008768:Methylmethacrylates; D012117:Resins, Synthetic; C000625830:Smart Dentin Replacement; C034578:Duralay
keywords: accuracy; edentulous jaw; implant impression technique; impression copings; passive fit; splinting material