Push-out bond strength of different intracanal posts in the anterior primary teeth according to root canal filling materials

Abstract

Background:This study was carried out to evaluate the effect of root canal filling on the bond strength of three intracanal posts in the primary incisors.Materials and Methods:Sixty primary incisors were prepared and then divided into two groups (n = 30). The first group canals obturated with zinc oxide eugenol (ZOE) and Group 2 canals obturated with Metapex. Further, the two group categories were divided into three subgroups (n = 10): (1) short composite post (SCP), (2) glass fiber posts (GFPs) cemented with flowable composite, and (3) GFP with glass ionomer cement (GFP + GIC). The push-out test was performed with a universal testing machine. The results were statistically analyzed with two-way analysis of variance.(α = 0.05).Results:The mean bond strength of the first group obturated with ZOE was lower than that of the second group obturated with Metapex (P = 0.046). Moreover, from a statistical point of view, in all three subgroups, the correlation of mean push-out bond strength between SCP and GFP coated with flowable composite was not substantial at P = 0.97. However, the mean bond strength of SCP was in fact significantly greater than that of the GFP coated with GIC since P = 0.034.Conclusion:Using ZOE resulted in the significant reduction of the mean bond strength of the intracanal posts when utilized in the primary anterior teeth. Likewise, SCP and GFP coated with flowable composite showed higher push-out bond strengths for restoring primary anterior teeth.

Evaluation of the Effects of Different Types of Resin Cement Systems on the Push-Out Bond Strength of the Fiber Post to Intracanal Dentin in Anterior Primary Teeth

“…A prefabricated fiber-reinforced resin composite post is one of the most commonly used posts for restoring severely damaged anterior primary teeth [21]. Previously, fiber posts were used successfully in severely damaged primary teeth in experimental studies [16,20]. A clinical study also showed that fiber post presented an acceptable clinical performance concerning material fracture and retention when restoring severely decayed primary anterior teeth at the 12-month follow-up period [11].…”

“…Another possible influential factor on the bond strength of the fiber posts to root canal dentin is the root canal filling materials during endodontic therapy [16]. It has been reported that the root canal filling materials containing eugenol, such as zinc oxide eugenol, can negatively affect the bond strength of the fiber posts cemented with resin cements to the root canal dentin [16]. However, root canal filling materials containing calcium hydroxide, such as Metapex, showed higher post bond strength to the root canal's dentin surfaces than zinc oxide [16].…”

“…It has been reported that the root canal filling materials containing eugenol, such as zinc oxide eugenol, can negatively affect the bond strength of the fiber posts cemented with resin cements to the root canal dentin [16]. However, root canal filling materials containing calcium hydroxide, such as Metapex, showed higher post bond strength to the root canal's dentin surfaces than zinc oxide [16]. Metapex is easily resorbed from the periapical area and showed higher post bonding strength to the dentin surfaces of the root canal compared to zinc oxide [16].…”

“…Various materials have been previously used for fiber post cementation in primary teeth [5,[16][17][18]. A common luting material for fiber post cementation in primary teeth is flowable resin composite [16].…”

“…Various materials have been previously used for fiber post cementation in primary teeth [5,[16][17][18]. A common luting material for fiber post cementation in primary teeth is flowable resin composite [16]. Glass ionomer cement (GIC) has also been previously used for post cementation in primary teeth [18].…”