Influence of Previous Provisional Cementation on the Bond Strength Between Two Definitive Resin-based Luting and Dentin Bonding Agents and Human Dentin

Abstract

Clinical RelevanceBased on in vitro results in extracted teeth, the dual bonding method used was effective in restoring the shear bond strength values that decreased after applying provisional luting agent regardless of the composition of the provisional luting agent (eugenol-based or eugenolfree) used. SUMMARYThis study evaluated the effect of two different types of provisional luting agents (RelyX Temp E, eugenol-based; RelyX Temp NE, eugenol-free) on the shear bond strengths between human dentin and two different resin-based luting systems (RelyX ARC-Single Bond and Duo Link-One Step) after cementation with two different techniques (dual bonding and conventional technique). One hundred human molars were trimmed parallel to the original long axis, to expose flat dentin surfaces, and were divided into three groups. After related surface treatments for each specimen, the resin-based luting agent was applied in a silicone cylindrical mold (3.5 x 4 mm), placed on the bonding-agent-treated dentin surfaces and polymerized. In the control group (n=20), the specimens were further divided into two groups (n=10), and two different resin-based luting systems were immediately applied following the manufacturer's protocols: RelyX ARC-Single Bond (Group I C ) and Duo Link-One Step (Group II C). In the provisionalization group (n=40), the specimens were further divided into four subgroups of 10 specimens each (Group I N, I E and Group II N, II E). In Groups I N and II N, eugenolfree (RelyX NE), and in groups I E and II E, eugenol-based (RelyX E) provisional luting Operative Dentistry, 2007, 32-1, 84-93 agents (PLA), were applied on the dentin surface. The dentin surfaces were cleaned with a flourfree pumice, and the resin-based luting systems RelyX ARC (Group I N and E) and Duo Link (Group II N and E) were applied. In the Dual bonding groups (n=40), the specimens were divided into four subgroups of 10 specimens each (Group I ND, ED and Group II ND, ED). The specimens were treated with Single Bond (Groups I ND and ED) or One Step (Groups II ND and ED). After the dentin bonding agent treatment, RelyX Temp NE was applied to Groups I ND and II ND, and RelyX Temp E was applied to Groups I ED and II ED. The dentin surfaces were then cleaned as described in the provisionalization group, and the resin-based luting systems were applied: RelyX ARC-Single Bond (Group I ND and ED) and Duo Link-One Step (Group II ND and ED). After 1,000 thermal cycles between 5°C and 55°C, shear bond testing was conducted at a crosshead speed of 0.5 mm/minutes. One-way ANOVA, followed by a post hoc Tukey test (α α=0.05) was done. The dentin-resin-based luting system interfaces were evaluated under a scanning electron microscope. There was a significant reduction in the mean shear bond strength values of groups subjected to the provisionalization compared to the control and dual bonding technique groups (p<0.05). The composition of provisional luting did not create a significant difference with regard to reducing shear bond strength values (p>0.05). Wi...

Interactions between resin-based temporary materials and immediate dentin sealing

“…In this study the temporary material was mechanically removed using a curette [9] before cleaning with non-fluoridated pumice flour and conditioning with acid. The shear bond strength values following this cleaning were similar to those of the control group, in contrast to previous reports [3,14,17]. It is possible that the mechanical cleaning efforts are responsible for the improved bonding in general [18].…”

Effect of Eugenol Exposure Time and Post-removal Delay on the Bond Strength of a Self-etching Adhesive to Dentin

“…[10][11][12][13]15,[18][19][20][21][23][24] However, these studies reported conflicting results. Despite other methodological differences, the exposure period to ZOE has not been standardized during these studies, which may have affected the results.…”

“…Several studies have found that eugenol-containing cements did not reduce the bond strength to dentin. 10,12,15,[23][24] However, other studies have reported contradictory results. 11,13,[18][19][20][21] These differences in results can be explained by differences between the adhesive systems and methodologies used.…”

“…Several studies using ZOE provisional restoration for seven days also found no adverse effect of eugenol on the bond strength of adhesive to dentin. 10,12,15,[23][24] In opposition to this, Carvalho and others 11 found lower bond strength of a self-etching adhesive to dentin when ZOE had been previously placed over the substrate for 24 hours. However, all cited studies evaluated the effects of ZOE provisional restorations used for 24 hours or 7 days.…”

“…[10][11][12][13][14][15] Among the provisional restorative materials, zinc oxide eugenol (ZOE) is widely used as a temporary material during endodontic treatments and restorative dentistry due to its sedative effect on sensitive teeth, its low cost, ease of removal and proper seal against leakage. 16 However, eugenol (2-methoxi-4-allyphenol) is a radical scavenger and may inhibit the polymerization of resin materials, 17 including the adhesive system that contributes to a reduction in bond strength.…”