title: Retention of radicular posts varying the application technique of the adhesive system and luting agent.
abstract: This study evaluated in vitro the retention of intracanal cast posts cemented with dual-cure resin varying the application method of the primer/adhesive solution and luting agent in the prosthetic space prepared to receive the posts. Sixty endodontically treated maxillary canines had their crowns discarded, and their roots were embedded in acrylic resin. The prosthetic spaces were prepared with Largo burs mounted on a low-speed handpiece coupled to a parallelometer in order to maintain length and diameter of intraradicular posts constant and to guarantee that the preparations were parallel after casting. Two groups (n = 30) were randomly formed according to the device used to apply the adhesive system: microbrush or standard bristle brush (control). Each group was divided into 3 subgroups (n = 10) according to the technique used to place the luting agent into the root canal: using only a lentulo spiral before setting the post, applying it onto the post surface, or combining both methods. After 72 hours, the tensile force required to dislodge each post was determined by a universal testing machine (Instron 4444) set at a speed of 1 mm/min. The results indicated that the use of the microbrush yielded higher bond strength values (0.1740 +/- 0.04 kN) than those recorded for the bristle brush tip (0.1369 +/- 0.04 kN, p < 0.001). Bonferroni's test demonstrated a higher retention (p < 0.001) in radicular post cemented with the technique that combined both methods (lentulo + post: 0.1787 +/- 0.03 kN) than that obtained with lentulo (0.1461 +/- 0.065 kN) or post (0.1416 +/- 0.03 kN) alone. The interactions between the adhesive system and luting agent application techniques presented statistical difference (p < 0.001). It was concluded that the best performance in terms of tensile strength among the tested conditions was obtained when the adhesive system was applied with a microbrush and the luting agent was taken into the root canal with lentulo spirals alone (0.1961 +/- 0.04 kN) and combining both methods (lentulo + post: 0.1911 +/- 0.02 kN).
authors.affiliation: Department of Dentistry, School of Dentistry of Ribeirão Preto, University of Ribeirão Preto.
authors.forename: Tabajara Sabbag
authors.initials: TS
authors.lastname: Fonseca
authors.forename: Edson
authors.initials: E
authors.lastname: Alfredo
authors.forename: Luiz Pascoal
authors.initials: LP
authors.lastname: Vansan
authors.forename: Ricardo Gariba
authors.initials: RG
authors.lastname: Silva
authors.forename: Yara T Correa Silva
authors.initials: YT
authors.lastname: Sousa
authors.forename: Paulo César
authors.initials: PC
authors.lastname: Saquy
authors.forename: Manoel D
authors.initials: MD
authors.lastname: Sousa-Neto
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003757:Dental Implantation / Q000592:standards*; D017268:Dental Prosthesis Retention / Q000592:standards*; D003782:Dental Pulp; D017220:Dentin-Bonding Agents; D006801:Humans; D011176:Post and Core Technique / Q000592:standards*; D018915:Root Canal Preparation / Q000592:standards*
chemical_list: D000180:Acrylic Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents