Objectives. To assess whether the pre-cure temperature of resin cements significantly influenced the bonding potential to dentin. Methods. Forty extracted molars were randomly divided into 8 groups (n = 5): Groups (1-4) RelyX Unicem (RU, 3 M ESPE) and Groups (S-8) Panavia F 2.0 (PF, Kuraray Co.), at pre-cure temperatures of 4, 24, 37, and 60 degrees C, respectively. Cements were used in dual-cure mode for luting composite overlays (Paradigm MZ100, 3 M ESPE) to dentin. Microtensile bond strength testing and scanning electron microscope (SEM) observations of cement-dentin interfaces were performed. Results. Group 4 had to be eliminated as RU at 60 degrees C under-went such an accelerated curing that was already set at the time of dispensing. The bond strengths (MPa) measured at refrigerator, room, and intraoral temperature were, respectively: RU 5.4 +/- 1.7, 11.4 +/- 6.1, 10.6 +/- 4.2; PF 7.4 +/- 3.7, 13.9 +/- 6.2, 12 +/- 5.2. The statistical analysis revealed that both luting agents developed a significantly weaker adhesion when used at refrigerator temperature (p < 0.05). No statistically significant differences in bond strength were recorded when either cement was used at 24 or 37 degrees C (p > 0.05). Pre-heating of PF to 60 degrees C resulted in a significant increase in bond strength (20.7 +/- 9.4 MPa; p < 0.05). SEM observations disclosed an enhanced potential of PF to form a hybrid layer as the temperature increased over 4 degrees C. RU exhibited a less porous and more homogeneous layer at intraoral than at refrigerated temperature. Significance. It is advisable to let refrigerator-stored resin cements warm up to at least room temperature prior to clinical use. Pre-heating to 60 degrees C enhances the bonding potential of PF. (c) 2007 Academy of Dental materials. Published by Elsevier Ltd. All rights reserved.
Cantoro, A., Goracci, C., Papacchini, F., Mazzitelli, C., Fadda, G.M., Ferrari, M. (2008). Effect of pre-cure temperature on the bonding potential of self-etch and self-adhesive resin cements. DENTAL MATERIALS, 24(5), 577-583 [10.1016/j.dental.2007.06.012].
Effect of pre-cure temperature on the bonding potential of self-etch and self-adhesive resin cements
GORACCI C.;FERRARI M.
2008-01-01
Abstract
Objectives. To assess whether the pre-cure temperature of resin cements significantly influenced the bonding potential to dentin. Methods. Forty extracted molars were randomly divided into 8 groups (n = 5): Groups (1-4) RelyX Unicem (RU, 3 M ESPE) and Groups (S-8) Panavia F 2.0 (PF, Kuraray Co.), at pre-cure temperatures of 4, 24, 37, and 60 degrees C, respectively. Cements were used in dual-cure mode for luting composite overlays (Paradigm MZ100, 3 M ESPE) to dentin. Microtensile bond strength testing and scanning electron microscope (SEM) observations of cement-dentin interfaces were performed. Results. Group 4 had to be eliminated as RU at 60 degrees C under-went such an accelerated curing that was already set at the time of dispensing. The bond strengths (MPa) measured at refrigerator, room, and intraoral temperature were, respectively: RU 5.4 +/- 1.7, 11.4 +/- 6.1, 10.6 +/- 4.2; PF 7.4 +/- 3.7, 13.9 +/- 6.2, 12 +/- 5.2. The statistical analysis revealed that both luting agents developed a significantly weaker adhesion when used at refrigerator temperature (p < 0.05). No statistically significant differences in bond strength were recorded when either cement was used at 24 or 37 degrees C (p > 0.05). Pre-heating of PF to 60 degrees C resulted in a significant increase in bond strength (20.7 +/- 9.4 MPa; p < 0.05). SEM observations disclosed an enhanced potential of PF to form a hybrid layer as the temperature increased over 4 degrees C. RU exhibited a less porous and more homogeneous layer at intraoral than at refrigerated temperature. Significance. It is advisable to let refrigerator-stored resin cements warm up to at least room temperature prior to clinical use. Pre-heating to 60 degrees C enhances the bonding potential of PF. (c) 2007 Academy of Dental materials. Published by Elsevier Ltd. All rights reserved.File | Dimensione | Formato | |
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https://hdl.handle.net/11365/3524
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