Effect of endodontic sealers on bond strength of restorative systems to primary tooth pulp chamber

Abstract

Background/purpose Although current literature suggests that root canal sealers affect the bonding ability of restorative systems to pulp chamber dentin of permanent teeth, primary teeth have not been investigated. This study intended to evaluate the microtensile bond strength (μTBS) of three restorative systems to pulp chamber dentin in primary teeth and to determine the effect of two different root canal sealers on the μTBS. Materials and methods Ninety primary molars were used in this study. The teeth were randomly divided into three main groups according to canal sealers: (1) control (without sealer); (2) Metapex; and (3) zinc-oxide eugenol. The main groups were further divided into three subgroups depending on the coronal restorative system: (1) compomer (Prime Bond NT + Dyract EXTRA); (2) composite (Clearfil Tri-S Bond + Clearfil Photo Posterior); and (3) resin-modified glass ionomer (Fuji II LC). After restoration, the buccal wall of the pulp chamber was sectioned to obtain sticks (1 mm × 1 mm). The μTBS was then measured. Data were analyzed with two-way analysis of variance, followed by a posthoc test. The interfacial morphology of the bonded space was evaluated using scanning electron microscopy. Results In the control group, a significant difference was observed only for the μTBS of the composite (P < 0.05). Compared with the control groups, Metapex and zinc-oxide eugenol significantly reduced the μTBS of restorative systems (P < 0.05). Conclusion Composite materials seemed to bond to pulp chamber dentin in primary teeth with a higher strength than compomer and resin-modified glass ionomer. Metapex and zinc-oxide eugenol canal filling materials reduced the bond strength of all three restorative systems.

Effect of Root Canal Filling Materials and Pretreatment with Solvents on the Shear Bond Strength of Composite Resin with Primary Tooth Dentin

“…Our results showed that Metapex weakens the bonding adhesion. This reduction could be attributed to two main reasons that were also mentioned in other studies: remnant Metapex that directly affects the bonding and also dissolving of remnant Metapex material when exposed to adhesive primer, which contains ethanol and acetone [ 12 ].…”

“…Hence, we evaluated the effect of different root canal filling materials and their solvents on shear bond strength of composite to anterior primary teeth. Although it was reported that root canal sealers affect bond strength of resin-based materials to pulp chamber dentin in permanent teeth [ 12 ], less attention has been given to this subject in primary dentition.…”

“…The same results were reported in other studies. Elbay and Tosun [ 12 ] in their study found that remnant of sealers in dentinal tubules can lead to reduced bonding. However, researchers have shared different opinions in this regard.…”

“…In some studies, it was shown that Metapex (calcium hydroxide/iodoform mixture) results in reducing the bonding of adhesives to primary tooth dentin. There are two scenarios; one is that remnant material directly reduces the bonding ability (as it was told for ZOE), or remnant Metapex might be dissolved when exposed to adhesive primer which contains ethanol or acetone, hence, reducing the bond strength [ 12 ].…”

The Effect of Different Cleaning Materials on the Bond Strength of Resin Composite to Primary Teeth Dentin Contaminated with Root Canal Sealer

“…In the literature review, there are very few studies on root canal sealer and contaminated primary tooth bond strength. Elbay and Tosun found that composite materials bonded to pulp chamber dentin in primary teeth had higher strength than compomers and resin-modi ed glass ionomers in their study on bond strength of restorative systems in the primary tooth pulp chamber of endodontic sealers [20]. In addition, the composite was applied to primary teeth in their study.…”