Fracture resistance of primary anterior teeth restoredwith different intracanal post systems

Abstract

Introduction: Several intracanal post-systems have been proposedfor the restoration of severely broken down primary incisors.However, there are insufficient data on the strength of the varioussystems. Thus, the aim of this in-vitro study was to compare thefracture resistance of endodontically treated primary incisorsrestored with different intracanal post-systems.Materials and methods: Thirty acrylic teeth were sectioned 2 mmabove the CEJ followed by obturation of the root canals usingMetapex. The teeth were subsequently immersed in melted waxupto 2 mm below the CEJ and embedded in brass cylinders(20 · 30 mm) using methyl methacrylate acrylic resin. Followingresin polymerization, the wax was removed from the resin blocksusing hot water and replaced with polyether impression materialto simulate the periodontal ligament. The teeth were randomlydivided into: (i) no post, (ii) shoulder preparation with no post,(iii) composite post, (iv) wire post, (v) omega loop, and (vi)RelyX fiber post groups. Prior to placement of the variouspost-systems 5 mm of Metapex was removed followed byplacement of 2 mm of glass ionomer cement. The teeth wererestored using composite resin strip crowns and then subjected toloading using an Instron-1185 at a cross-head speed of 0.5 mm/min, 2 mm from the incisal edge at 45to the long axis until failure. ANOVA and Student-Newman–Keuls test were usedfor data analysis.Results: Fracture resistance values exhibited by the RelyX fiberpost and shoulder preparation with no post were significantlydifferent from the remaining groups (P < 0.05).Conclusion: RelyX fiber post group exhibited the highest fractureresistance values among the different intracanal post-systems.