title: Dimensional accuracy and retentive strength of a retrievable cement-retained implant-supported prosthesis.
abstract: The purpose of this research project was to compare the fit of a retrievable cement-retained implant-supported framework to that of a traditional wax and cast, screw-retained framework and to test the strength of the cemented restoration. Ten telescopic frameworks were luted to gold cylinders with a bis-GMA resin cement. The control group consisted of 10 frameworks fabricated with traditional wax and casting techniques directly to the gold cylinders. Frameworks were analyzed for distortion in the z-axis using scanning electron microscopy and a single screw test. Results demonstrated that the retrievable cement-retained group had a decreased gap distance and improved angular distortion (statistical significance P < .01) compared to the control group. Retentive strength measurements for the cement-retained group with a direct pull-out test revealed a mean pull-out force of 65.7 kg. Three of the 5 samples surpassed the tensile strength of the gold retaining screws (76 kg). Cement-retained restorations demonstrated superior fit in the z-axis and angular distortion compared to traditional wax and cast screw-retained frameworks. Retentive tests support a simplified technique of clinically luting telescopic implant-supported frameworks with adequate retentive strength.
authors.affiliation: Columbia University School of Dental and Oral Surgery, Garden City, New York 11530, USA. rjandi@hotmail.com
authors.forename: A P
authors.initials: AP
authors.lastname: Randi
authors.forename: A T
authors.initials: AT
authors.lastname: Hsu
authors.forename: A
authors.initials: A
authors.lastname: Verga
authors.forename: J J
authors.initials: JJ
authors.lastname: Kim
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation; D000044:Dental Abutments; D003735:Dental Casting Technique; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003779:Denture Design; D003781:Denture Retention; D003828:Denture, Overlay; D003830:Denture, Partial, Fixed; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D014885:Waxes
chemical_list: D015921:Dental Implants; D006047:Gold Alloys; D019279:Resin Cements; D014885:Waxes; D017438:Bisphenol A-Glycidyl Methacrylate