title: The influence of master cast technique on the cast precision of implant-retained fixed prostheses.
abstract: The aim of this study was to evaluate the precision of three different mold filling techniques in order to obtain a cast simulating a three-unit, implant-retained, fixed prosthesis. Thirty casts (n = 10) were obtained using three different mold filling techniques. Group 1 used a unique fulfillment technique, Group 2 used a two-step fulfillment technique, and Group 3 used a latex cylinder technique. Using a metallic matrix, a titanium substructure was created to simulate a three-unit fixed prosthesis used as reference to evaluate the marginal misfit and tension forces in each cast. The vertical misfit was measured by an optical microscope with an increase of 120X and by an analysis unit using the one-screw test. The tension was quantified using strain gauges.  The strain results showed a statistical difference between Group 3 and the other groups. The Tukey test showed no difference between the different treatment groups (p = 0.05). All three techniques were deemed efficient; however, considering that the cylinder latex technique induced less force toward the implants, it is the preferable technique for daily clinical practice.
authors.affiliation: Piracicaba Dental School, Campinas State University, Piracicaba, Sao Paulo, Brazil.
authors.forename: Mariana Agustinho
authors.initials: MA
authors.lastname: Rodrigues
authors.forename: Leonardo Flores
authors.initials: LF
authors.lastname: Luthi
authors.forename: Guilherme Elias Pessanha
authors.initials: GE
authors.lastname: Henriques
mesh_terms: D002133:Calcium Sulfate / Q000737:chemistry; D003734:Dental Casting Investment / Q000737:chemistry; D003735:Dental Casting Technique / Q000295:instrumentation / Q000592:standards*; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000295:instrumentation; D018772:Dental Marginal Adaptation / Q000592:standards; D003764:Dental Materials / Q000737:chemistry; D019094:Dental Prosthesis, Implant-Supported / Q000592:standards*; D003779:Denture Design; D003781:Denture Retention / Q000592:standards*; D003830:Denture, Partial, Fixed / Q000592:standards*; D006801:Humans; D008422:Materials Testing; D003765:Models, Dental; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D003734:Dental Casting Investment; D003760:Dental Impression Materials; D003764:Dental Materials; D014025:Titanium; D002133:Calcium Sulfate