The use of reinforced composite resin cement as compensation for reduced post length

• Published in: The Journal of prosthetic dentistry Vol. 86; no. 3; pp. 304 - 308
• Main Authors: Nissan, Joseph, Dmitry, Yevnin, Assif, David
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.09.2001
• Subjects: Analysis of Variance; Cementation; Composite Resins - chemistry; Dental Cements - chemistry; Dental Prosthesis Design; Dental Prosthesis Retention; Dental Restoration Failure; Dentistry; Humans; Multivariate Analysis; Post and Core Technique - instrumentation; Resin Cements - chemistry; Stainless Steel - chemistry; Statistics as Topic; Surface Properties; Tensile Strength; Titanium - chemistry; Zinc Phosphate Cement - chemistry
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1067/mpr.2001.114759

Statement of Problem. Cements that yield high retentive values are believed to allow use of shorter posts. Purpose. This study investigated the use of reinforced composite resin cement as compensation for reduced dowel length. Material and Methods. The retention values of stainless steel posts (parallel-sided ParaPost and tapered Dentatus in 5-, 8-, and 10-mm lengths) luted with Flexi-Flow titanium-reinforced composite resin and zinc phosphate cements were evaluated. Single-rooted extracted human teeth with crowns (n = 120), removed at the cementoenamel junction, were randomly divided into 4 groups of 30 samples each. Different post lengths were luted with either Flexi-Flow or zinc phosphate. Each sample was placed into a specialized jig and on a tensile testing machine with a crosshead speed of 2 mm/min, applied until failure. The effect of different posts and cements on the force required to dislodge the dowels was evaluated with multiple analyses of variance (ANOVA). One-way ANOVA with Scheffé contrast was applied to determine the effect of different post lengths on the retentive failure of posts luted with the 2 agents. Results. Flexi-Flow reinforced composite resin cement significantly increased retention of ParaPost and Dentatus dowels (P<.001) compared with zinc phosphate. One-way ANOVA revealed no statistically significant difference (P>.05) between mean retention of both dowels luted with Flexi-Flow for all posts length used (5 mm = 8 mm = 10 mm). Mean retention values of the groups luted with zinc phosphate showed a statistically significant difference (P<.001) for the different post lengths (10 > 8 > 5 mm). Parallel-sided ParaPost dowels demonstrated a higher mean retention than tapered Dentatus dowels (P<.001). Conclusion. In this study, Flexi-Flow reinforced composite resin cement compensated for the reduced length of shorter parallel-sided ParaPost and tapered Dentatus dowels. (J Prosthet Dent 2001;86:304-8.)