title: Marginal fit of indirect composite inlays using a new system for manual fabrication.
abstract: This in vitro study compares a new system for manual chair side fabrication of indirect composite restorations, which uses silicone models after alginate impressions, to CAD/CAM-technology and laboratory manual production techniques. MATRIALS AND METHODS: and study design Each 10 composite inlays were fabricated using different types of production techniques: CAD/CAM- technology (A), the new inlay system (B), plaster model after alginate impression (C) or silicone impression (D). The inlays were adapted into a metal tooth and silicone replicas of the cement gaps were made and measured. Statistical analysis was performed using ANOVA and Tukey's test. Results and Statistics In group A the biggest marginal gaps (174.9μm ± 106.2μm) were found. In group B the gaps were significantly smaller (119.5 μm ± 90.6 μm) than in group A (p=0.035). Between groups C (64.6 μm ± 68.0μm) and D (58.2 μm ± 61.7 μm) no significant differences could be found (p=0.998), but the gaps were significantly smaller compared with group B. Conclusion Chairside manufacturing of composite inlays resulted in better marginal precision than CAD/CAM technology. In comparison to build restorations in a laboratory, the new system is a timesaving and inexpensive alternative. Nevertheless, production of indirect composite restorations in the dental laboratory showed the highest precision.
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Research, Hannover Medical School, Hannover, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Pott
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Research, Hannover Medical School, Hannover, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Rzasa
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Research, Hannover Medical School, Hannover, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Stiesch
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Research, Hannover Medical School, Hannover, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Eisenburger
mesh_terms: D000464:Alginates / Q000737:chemistry; D002133:Calcium Sulfate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D017076:Computer-Aided Design; D003760:Dental Impression Materials / Q000737:chemistry; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D003765:Models, Dental; D016628:Replica Techniques; D012828:Silicones / Q000737:chemistry; D013499:Surface Properties
chemical_list: D000464:Alginates; D003188:Composite Resins; D003760:Dental Impression Materials; D003764:Dental Materials; D012828:Silicones; D002133:Calcium Sulfate