Effect of temporary cements on the bond strength of a resin cement to a pre-hybridized dentin

Abstract

This study assessed the bond strength of a resin cement when Immediate Sealed Dentin (ISD) was contaminated by different temporary cements applying a microshear test. Forty-eight fragments of third molar crowns were mounted in acrylic resin and worn until the dentin was exposed. The substrates were sealed with a 3-step conventional adhesive system and divided into four groups (n=12): Control (without temporary cement) and three groups that used different temporary cements -Provy, RelyX Temp NE, and Provitemp. The temporary cements were removed after 7 days of storage. Resin cement RelyX ARC was applied to the contaminated substrates. Microshear bond strength was evaluated using a universal testing machine (0.5 mm/min). Data was analyzed with ANOVA and a Dunnett post-hoc test (p<0.05). Additionally, three samples from each group were prepared for scanning electron microscope analysis. Means and standard deviations of microshear bond strength (MPa) were 17.96±1.65, 16.70±1.43, 20.43±1.30 and 33.75±4.72 for Control, Provy, RelyX Temp, and Provitemp, respectively. Statistically significant difference was observed between the Control and Provitemp samples (p=0.0002). Adhesive failures were dominant (50%), followed by cohesive failures with cement (26%), and cohesive failures with dentin (24%). Residues of Provy and Provitemp were observed on the sealed dentin. Provitemp temporary cement sealing increased the microshear bond strength of the resin cement on dentin treated with IDS.

Immediate Dentin Sealing: A Literature Review

“… The study supported the use of IDS which contributed to the high success rate in terms of debonding (2%). Lima et al 2017 145 In vitro Bond strength Assessed the bond strength of a resin cement (RelyX ARC) when IDS (Adper Scotchbond Multi-Purpose) was contaminated by different temporary cements (Provy/RelyX Temp NE/Provitemp). Provitemp temporary cement sealing increased microshear bond strength of the resin cement on dentin treated with IDS.…”

Effect of temporary cements and their removal methods on the bond strength of indirect restoration: a systematic review and meta-analysis

“…Resin temporary cement would plug the dentinal tubules, interfering with subsequent adhesive penetration [3,25]. However, this article concluded that the resin-based temporary cement had no significant effect on bond strength with moderate intragroup heterogeneity, most likely due to the exceptional research by Lima [16].…”

“…In the DDS subgroup, after removing Fiori-Júnior [ 22 ], the overall I 2 decreased to 51%. In the resin temporary cement subgroup, after omitting Lima [ 16 ], there was a decline in intragroup heterogeneity ( I 2 from 68 to 56%) and swift of effect ( Z -test p from 0.11 to 0.007), leading to an 8% drop of overall I 2 . The altered result was that resin temporary cement lowered the bond strength by − 0.73 MPa (95% CI = − 1.26 to − 0.2).…”

“…Resin temporary cement would plug the dentinal tubules, interfering with subsequent adhesive penetration [ 3 , 25 ]. However, this article concluded that the resin-based temporary cement had no significant effect on bond strength with moderate intragroup heterogeneity, most likely due to the exceptional research by Lima [ 16 ]. Abnormally, Lima indicated that the resin cement acquired significantly higher bond strength than the control group, possibly because the acrylate-based temporary cement interacted with unreacted monomers in oxygen-inhibited layer and promoted adhesion.…”

“…In terms of mechanical cleaning ways alone, Santos found that Al 2 O 3 abrasion resulted in notably higher bond strength than pumice slurry [ 13 ], while Özcan revealed that there was no significant difference between them [ 14 ]. Similarly, considering various temporary cements, resin-based cement was discouraged due to its removal challenge and bond strength decline [ 5 , 15 ], whereas other scholars came to the opposite conclusion [ 16 ]. But it was widely acknowledged that zinc oxide cement with eugenol inhibited polymerization, regardless of the adhesive system and bond strength test modality [ 15 , 17 ].…”