Influence of different post luting cements on the fracture strength of endodontically treated teeth: An in vitro study

Abstract

To evaluate the fracture resistance of endodontically treated mandibular premolars restored with glass fiber posts using different luting agents. Methods: Twenty-four extracted single-rooted mandibular premolars were endodontically treated, and post spaces were prepared to receive fiber posts. They were assigned to three test groups (n=8) according to the type of cement used for the cementation of glass fiber posts: RC group: adhesive resin cement group (etch and rinse), SC group: self-adhesive resin cement group, and GC group: glass ionomer cement group. Teeth in all groups were adhesively restored with a composite resin core material and crowned with Ni-Cr crowns. All specimens were subjected to tangential loading using a universal testing machine until fracture at 30°. Failure loads were recorded, and data were analyzed using one-way ANOVA followed by Tukey's HSD test (α=0.05). Results: Specimens in the RC group were more resistant (258.3±12.7 N) to fracture than those in the SC (218.7±11.1 N) and GC (165.4±8.9 N) groups (P≤0.001). One-way ANOVA indicated that the type of cement had a significant effect on the fracture resistance of endodontically treated lower premolars (P≤0.001). Conclusion: The type of cement that was used to fix glass fiber posts was a determining factor of the fracture resistance of endodontically treated lower premolars.

An Evaluation of the Fracture Resistance of Endodontically Treated Teeth Restored With Two Types of Posts (Diamond Posts and Fiber Posts): An In Vitro Study

“…Moreover, there is usually just one root on the mandibular premolars [ 3 ]. Mandibular premolars have also been used in a number of research studies to evaluate the fracture resistance of the post system and have been considered suitable for this purpose [ 5 , 15 , 16 ]. Since the dimension of the teeth was shown to be a crucial factor in the specimen's ability to withstand fracture, it was meticulously chosen for this research to be uniform [ 17 ].…”

Influence of Glass Fiber Post Design and Luting Cements on Ease of Post Removal and Fracture Strength of Endodontically Retreated Teeth

“…Mandibular premolars were selected in this study as they are most susceptible to root fracture and used in previous studies. [ 13 ] To mimic clinical conditions, NaOCl was used for canal irrigation. Although NaOCl is reported to compromise bond strengths of the adhesive systems to canal dentine, Nova et al [ 15 ] observed that NaOCl irrigation did not decrease the bond strength of self-etch or self-adhesive resin cement to a nonacceptable clinical level.…”

“…Hence, this explains the ease of Contec Blanco post removal irrespective of the cement type. Samran et al [ 13 ] reported that additional dentine conditioning step in adhesive cement (total etch) achieved greater bond strength than self-adhesive cement due to formation of a dentine-post monobloc system and this was a determining factor for fracture resistance. Similarly, Zicari et al [ 24 ] found that self-etching 10-methacryloyloxydecyl dihydrogen phosphate-based cements presented the highest push-out bond strength as compared with self-adhesive cements.…”

“…[ 8 ] Hence, a considerable amount of radicular dentine can be lost during retreatment, especially in teeth restored with fiber post. [ 1 9 ] Although studies have evaluated the influence of post or cement types on bond strength or fracture resistance after post placement,[ 3 10 11 12 13 ] only few studies have evaluated the influence of fiber post and cement type on ease of removal (time) or fracture resistance after post removal. [ 1 8 , 9 14 ] Due to the ease of manipulation, self-adhesive resin cements are advocated for fiber post cementation as compared with regular self-etch adhesive technique, which is a sensitive as well as time-consuming procedure.…”

“…[ 1 8 , 9 14 ] Due to the ease of manipulation, self-adhesive resin cements are advocated for fiber post cementation as compared with regular self-etch adhesive technique, which is a sensitive as well as time-consuming procedure. [ 13 ]…”