Universal adhesives and dual-cured core buildup composite material: adhesive properties

Malaquias, Pâmela; Gutiérrez, Mario Felipe; Sutil, Elisama; Matos, Thalita de Paris; Hanzen, Taise Alessandra; Reis, Alessandra; Perdigão, Jorge; Loguercio, Alessandro Dourado

doi:10.1590/1678-7757-2020-0121

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Journal of Applied Oral Science

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Original Article • J. Appl. Oral Sci. 28 • 2020 • https://doi.org/10.1590/1678-7757-2020-0121 copy

Universal adhesives and dual-cured core buildup composite material: adhesive properties

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Dual-cured buildup composites and simplified light-cured adhesive systems are mixed with a chemical activator to prevent the incompatibility between them.

Objective:

To evaluate microshear bond strength (μSBS) and nanoleakage (NL) of three universal adhesives used under buildup composites using different curing modes, at baseline and after 6-months (6m).

Methodology:

Dentin specimens of 55 molars were assigned to: Clearfil Universal Bond[CFU], Prime&Bond Elect[PBE] and One Coat 7 Universal[OCU]. All-Bond Universal[ABU] and Adper Scotchbond Multi-Purpose[SMP] were used as controls. CFU, PBE, and OCU were: light-cured [LC], dual-cured using a self-curing activator [DC], and self-cured, using a self-curing activator and waiting for 20 min [SC]. Upon the application of the adhesive, transparent matrices were filled with a dual-cured buildup composite and light cured, then tested in mSBS. For NL, the specimens were submersed in ammoniacal silver nitrate and sectioned to observe under the SEM. Three-way ANOVA and Tukey's test were applied (α=0.05).

Results:

OCU/LC-PBE/LC resulted in higher mean μSBS than ABU/LC. For SMP/DC higher mean μSBS were obtained than for both CFU/DC and OCU/DC (baseline). No universal adhesive was significantly affected by curing mode or storage time. CFU, PBE, and OCU did not undergo significant changes in any curing mode (p>0.05). NL (baseline) PBE/LC resulted in higher %NL compared to ABU/LC. SMP/DC resulted in higher %NL than CFU/DC-OCU/DC. CFU/LC/DC resulted in lower %NL than CFU/SC. PBE/SC resulted in lower %NL than PBE/DC. OCU/LC/SC showed lower %NL than OCU/DC. OCU showed significant lower %NL than CFU and PBE. All CFU groups, as well as OCU/SC, resulted in increased %NL at 6m when compared with baseline.

Conclusion:

For universal adhesives used in etch-and-rinse mode, self-cured activator and different curing modes did not influence μSBS. However, some interactions were observed for NL, but this influence was material-specific.

Keywords:
Self-Curing of Dental Resins; Adhesive; Shear Strength; Dental Leakage

	24-hour water storage (24h)									6-month water storage (6m)
	LC			DC			SC			LC			DC			SC
	A	C	M	A	C	M	A	C	M	A	C	M	A	C	M	A	C	M
All-Bond Universal/Core-Flo DC	18	0	27							15	3	27
Adper Scotchbond Multi-Purpose/RelyX ARC				42	1	2							30	1	14
Clearfil Universal Bond/Clearfil DC Core Plus	18	1	26	23	1	21	22	2	21	15	4	26	17	6	22	15	3	27
Prime&Bond Elect/Fluorocore 2+	30	0	15	27	1	17	21	2	22	31	2	12	15	2	28	15	5	25
One Coat 7 Universal/ParaCore	25	3	17	27	4	14	16	2	27	20	3	22	18	2	25	26	4	15

24-hour water storage (24h)			6-month water storage (6m)
LC	DC	SC	LC	DC	SC
15.6 ± 3.3^C			15.7 ± 2.9^C
	24.9 ± 3.1^A			22.6 ± 1.6^A,B
19.9 ± 1.9^{B,C a,b}	15.6 ± 1.1^{C b,c}	17.9 ± 3.9^{B,C b}	19.3 ± 3.1^{B,C a,b}	12.4 ± 3.2^{D b,c}	22.8 ± 4.5^{A,B a,b}
23.4 ± 2.5^{A a}	22.1 ± 3.4^{A,B a}	18.4 ± 2.4^{B,C a,b}	24.0 ± 3.7^{A a}	21.1 ± 4.0^{B a,b}	20.2 ± 4.1^{B a,b}
21.3 ± 2.7^{B a}	21.0 ± 2.9^{B a,b}	22.8 ± 2.5^{A,B a}	19.2 ± 1.9B,^{C a,b}	20.5 ± 2.2^{B a,b}	20.2 ± 3.1^{B a,b}

	24-hour water storage (24h)			6-month water storage (6m)
	LC	DC	SC	LC	DC	SC
All-Bond Universal/Core-Flo DC (control LC)	5.7 ± 3.8^A,B			5.1 ± 3.7^A,B
Adper Scotchbond Multi-Purpose/RelyX ARC (control DC)		22.3 ± 4.1^D			22.0 ± 4.4^D
Clearfil Universal Bond/Clearfil DC Core Plus	5.2 ± 2.7^{A,B a,b}	5.2 ± 2.2^{A,B a,b}	14.6 ± 5.4^{C,D c}	17.8 ± 3.7^{C,D c,d}	14.0 ± 5.1^Cc	20.5 ± 7.4^{D d}
Prime&Bond Elect/Fluorocore 2+	14.5 ± 6.7^{C,D c}	17.9 ± 3.5^{D c}	10.8 ± 4.7^{C b}	22.8 ± 4.2^{D c}	19.1 ± 5.6^{D c}	14.8 ± 5.2^{C,D b,c}
One Coat 7 Universal/ParaCore	0.5 ± 1.9^{A a}	6.2 ± 2.1^{B b}	2.4 ± 1.1^{A a}	3.1 ± 1.5^{A a}	4.8 ± 3.4^{A,B a,b}	8.1 ± 3.4^{B b}

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[1] Corresponding address: Alessandro D. Loguercio, Universidade Estadual de Ponta Grossa - Faculdade de Odontologia - Ponta Grossa - PR - Avenida Carlos Cavalcanti, 4748 - Uvaranas, 84030-900 - Ponta Grossa, Paraná, Brasil. Phone: +55 42 99902 9903 e-mail: aloguercio@hotmail.com