Resin cements formulated with thio-urethanes can strengthen porcelain and increase bond strength to ceramics

Bacchi, Ataís; Spazzin, Aloísio Oro; Oliveira, Gabriel Rodrigues; Pfeifer, Carmem S.; César, Paulo Francisco

doi:10.1016/j.jdent.2018.04.002

Cited by 17 publications

(17 citation statements)

References 34 publications

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“…The experimental dual-cured resin cement was composed of Bis-phenol A diglycidyl dimethacrylate (Bis-GMA), urethane dimethacrylate (UDMA) and tri-ethylene glycol dimethacrylate (TEGDMA; Esstech) in a 50:30:20 mass ratio (BisGMA-UDMA-TEGDMA materials). This monomer system was chosen based on a previous study [33] which showed enhanced bonding to ceramics compared to other resins. All monomers were purchased from Esstech (Essington, PA, USA).…”

Section: Experimental Resin Cementmentioning

confidence: 99%

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Effect of experimental resin cements containing thio-urethane oligomers on the durability of ceramic-composite bonded interfaces

Correr-Sobrinho

Costa

Fugolin

et al. 2019

Biomaterial Investigations in Dentistry

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Thio-urethane oligomers improve conversion and mechanical properties of resin cements. The objective of this study was to evaluate the effect of resin cements formulated with thio-urethane (TU) oligomers on microtensile bond strength (mTBS) of ceramics to composites subjected to thermal/mechanical cycling. Methods: BisGMA/UDMA/TEGDMA (50/30/20 wt%) containg 0 (control, EC) or 20 wt% aliphatic or aromatic thiourethane (HDDI and BDI, respectively) were mixed with CQ/amine (0.2/0.8 wt%) and 25 wt% 0.7um Ba glass. Rely X Ultimate (RU-3M ESPE) was used as the commercial control. The cements were sandwiched between ceramic (IPS e.max Press) and resin composite blocks (Filtek Supreme, 3 M-ESPE). Eight bonded blocks were produced per experimental group. Prior to bonding, ceramic surfaces were etched (20 s-10% HF) and silanized. Composite surfaces were treated with Single Bond Universal (3 M ESPE). Specimens were stored for 24 h in distilled water at 37 C, and then either tested immediately, or subjected to thermal (10,000, 5 C and 55 C) or mechanical cycling (300,000 cycles). Sticks (1 mm 2 , average of 25 sticks per block) were cut and tested for mTBS (1.0 mm/min). Data were analyzed with two-way ANOVA/Tukey's test (a ¼ 5%). Fracture surfaces were analyzed to determine failure modes. Results: The mTBS for HDDI and RU was significantly higher than BDI and EC cements. BDI led to significantly higher mTBS than EC after 24 h, Tc and Mf. mTBS decreased significantly after thermal/mechanical cycling for all groups. Failure modes were predominantly adhesive or mixed. Significance: The use of selected thio-urethane oligomers was able to increase the mTBS of composite-cement-ceramic specimens. Tc and Mf reduced mTBS for all resins cements.

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Section: Experimental Resin Cementmentioning

confidence: 99%

“…Thio-urethane oligomers were added to the methacrylate organic matrix in proportions of 0 or 20 wt%. This proportion has been demonstrated to provide increased mechanical properties without affecting the material's viscosity [33]. The cement without the thiourethane served as an experimental control (EC).…”

Section: Experimental Resin Cementmentioning

confidence: 99%

Effect of experimental resin cements containing thio-urethane oligomers on the durability of ceramic-composite bonded interfaces

Correr-Sobrinho

Costa

Fugolin

et al. 2019

Biomaterial Investigations in Dentistry

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“…Six TU oligomers were synthesized as described previously . Information about the oligomers used in the study is presented in Table .…”

Section: Methodsmentioning

confidence: 99%

Optical properties and colorimetric evaluation of resin cements formulated with thio‐urethane oligomers

Bacchi

Caldas

César

et al. 2018

J Esthet Restor Dent

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Objective: The aim of this study was to evaluate the color parameters and optical properties of resin cements (RCs) formulated with thio-urethanes (TUs). Materials and methods:Six TUs were synthesized by combining thiols (pentaerythritol tetra-3-mercaptopropionate [PETMP] or trimethylol-tris-3-mercaptopropionate [TMP]) with difunctional isocyanates (1,6-Hexanediol-diissocyante [HDDI] [aliphatic-AL] or 1,3-bis(1-isocyanato-1-methylethyl) benzene [BDI] [aromatic-AR] or Dicyclohexylmethane 4,4 0 -Diisocyanate [HMDI] [cyclic-CC]). TUs (20 wt%) were added to a BisGMA/UDMA/TEGDMA matrix. Filler was introduced at 60 wt%. Fluorescence was evaluated through an UV-light emitting equipment. Coordinates L*, a*, and b* were obtained in the black and white reflectance to evaluate the contrast ratio (CR) and translucency parameter (TP 00 ). The coordinates obtained from transmittance were used to evaluate lightness (L*), chroma (C*), color difference (ΔE 00 ) after 6 month, and whiteness index for Dentistry (WI D ).Results: RCs formulated with TUs presented significantly higher CR, and fluorescence (with T_AR). Significantly lower C*, L*, and TP 00 (except for P_AR and T_AL) were also observed in RCs containing TUs. ΔE 00 were not significant among the materials. WI D was not influenced. Conclusion:RCs composed by TU oligomers present higher CR and lower translucency. The material also present higher fluorescence depending on the oligomer used.Clinical Significance: The use of thio-urethanes to formulate resin cements can ensure a luting material with improved potential to mask colored substrates due to the higher contrast ratio and lower translucency obtained. A final higher fluorescence of restoration is also expected with the use of specific oligomer.

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“…Guazzato et al [38] related two stress concentration peaks during flexural testing for bilayer systems, both on the bottom surface of the core and the porcelain when the specimens were tested with the porcelain turning down (tensile side). Thus, the transformation toughening mechanism may have generated a slight decrease in the zirconia's deflection during the flexural fatigue test, thereby generating lower stress concentration at the bottom surface of the porcelain [46], which did not happen for the liner application group. Furthermore, the surface topography analysis showed that the liner application leads to the presence of pores and high surface irregularities near the interface which could contribute to the mechanism of crack propagation, as the pores are small in dimension and may have had problems to be filled by the porcelain layer (Fig.…”

Section: Groupsmentioning

confidence: 99%

Influence of zirconia surface treatments of a bilayer restorative assembly on the fatigue performance

et al. 2021

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This study evaluated the influence of different surface treatments of zirconia used to enhance bonding with veneering porcelain, and thermocycling on the resistance to porcelain cracking and delamination during fatigue test. Methods: Bilayer ceramic discs were made from zirconia blocks (IPS e.max Zircad MO, Ivoclar Vivadent-0.7 mm thickness) and randomized into 8 groups (n= 15) according to two factors: 'zirconia surface treatment' (Control; Grinding-diamond bur; Air-abrasion-aluminum oxide particles; and Liner-application of a ceramic liner [IPS e.max Zirliner, Ivoclar Vivadent]); and 'thermocycling' (presence-12,000 thermal cycles; 5-55ºC; or absence). The discs were veneered with porcelain (IPS e.max Ceram, Ivoclar Vivadent-0.7 mm; totaling 1.4 mm thickness) according to ISO 6872:2015 for biaxial flexure strength testing. Fatigue tests (step-stress approach; 20 to 100 MPa; step of 10 MPa; 10,000 cycles per step; 10 Hz frequency) were run, followed by the data analysis (Kaplan-Meier and Mantel-Cox post-hoc tests). Analysis of roughness, topography, crystallographic phase arranges and fractography were also executed. Results: The surface treatment and thermocycling did not influence the porcelain crack nor delamination resistance. When only comparing the surface treatments for crack resistance outcome, the liner application depicted the worst fatigue performance in comparison to grinding and air-abrasion, while all groups were similar for delamination. Conclusions: Neither the surface treatment of the zirconia nor the thermocycling influences the porcelain crack resistance or the resistance to delamination of the bilayer porcelain-veneered zirconia specimens.

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Resin cements formulated with thio-urethanes can strengthen porcelain and increase bond strength to ceramics

Abstract: The current investigation suggests that it is possible to reinforce the porcelain-RC pair and obtain higher bond strength to LD and ZR with RCs formulated with selected types of thio-urethane oligomers.

Cited by 17 publications

References 34 publications

Effect of experimental resin cements containing thio-urethane oligomers on the durability of ceramic-composite bonded interfaces

Effect of experimental resin cements containing thio-urethane oligomers on the durability of ceramic-composite bonded interfaces

Optical properties and colorimetric evaluation of resin cements formulated with thio‐urethane oligomers

Influence of zirconia surface treatments of a bilayer restorative assembly on the fatigue performance

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