Comparison of strains produced in a bone simulant between conventional cast and resin-luted implant frameworks.
Complete-arch implant prostheses continue to exhibit horizontal and vertical misfit between frameworks and abutments. It has been suggested that these gaps may be eliminated and that restoration-induced stresses may be reduced by luting frameworks to screw-retained abutments intraorally. This study measured and compared the strains generated by clinically acceptable, conventional frameworks were made from a single master cast representing a bone simulant model of an edentulous mandible with five Nobel Biocare implants and 4-mm abutments. Two strain gauges were also embedded in the bone simulant model to measure strains at two locations. Resin-luted frameworks were made by securing abutments to the clinical model with five gold slot screws tightened to 10 Ncm. Strain-indicator readings were recorded at a standardized time following the initial fastening of each prosthesis (n = 3). Mean principal strains were determined and compared using a one-way repeated measures analysis of variance. A statistically significant difference was found in the principal strains between the conventional cast and the resin-luted frameworks. Overall, there was a decrease in the magnitude of strain for the resin-luted frameworks. Intraoral luting of frameworks may decrease the strains produced in the bone around implants.
Clelland
N L
NL
Department of Restorative Dentistry, Prosthodontics and Endodontics, College of Dentistry, Ohio State University, Columbus 43210-1241, USA.
van Putten
M C
MC
D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002484:Cementation; D000044:Dental Abutments; D003724:Dental Arch / Q000502:physiology*; D003734:Dental Casting Investment / Q000737:chemistry; D003738:Dental Cements / Q000737:chemistry; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D006047:Gold Alloys; D006801:Humans; D007575:Jaw, Edentulous / Q000503:physiopathology; D008334:Mandible / Q000502:physiology; D008953:Models, Anatomic; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical
D003734:Dental Casting Investment; D003738:Dental Cements; D015921:Dental Implants; D006047:Gold Alloys; D019279:Resin Cements; C086630:TwinLook cement; D017438:Bisphenol A-Glycidyl Methacrylate