Influence of acidic monomer concentration and application mode on the bond strength of experimental adhesives

KINTOPP, Cibele Cândida de Almeida; FURUSE, Adilson Yoshio; COSTA, Reginaldo Mendonça; LUCENA, Fernanda Sandes de; CORRER, Gisele Maria; GONZAGA, Carla Castiglia

doi:10.1590/1807-3107bor-2020.vol34.0105

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ORIGINAL RESEARCH, Dental Materials • Braz. oral. res. 34 • 2020 • https://doi.org/10.1590/1807-3107bor-2020.vol34.0105 copy

Influence of acidic monomer concentration and application mode on the bond strength of experimental adhesives

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The aim of this research was to evaluate the influence of MDP (10-methacryloyloxydecyl dihydrogen phosphate) concentration and application mode of experimental adhesives on microshear bond strength (μSBS) to dentin after storage in distilled water at 37°C for 24h and 6 months. Five experimental adhesives were prepared with: CQ, DABE, BHT, ethanol, HEMA, TEGDMA, Bis-EMA, UDMA, and Bis-GMA. Concentrations of 0 wt%, 3 wt%, 9 wt%, 12 wt% or 15 wt% of MDP were added to their composition. The adhesives were applied to flat dentin surfaces in etch-and-rinse or self-etching modes. Cylindrical molds filled with light-cured composite resin were placed above the dentin. The specimens were stored in distilled water at 37^oC for 24h or 6 months and submitted to μSBS testing. The adhesives were also submitted to pH analysis. The data were analyzed by one-way ANOVA, three-way ANOVA and Tukey’s test (α = 5%). All the adhesives used in the etch-and-rinse mode showed significantly higher bond strength than the adhesives applied in the self-etching approach. The 9 wt% adhesive showed the highest bond strength values, and 3 wt% was most stable after storage. A strong negative correlation between MDP concentration and pH was observed. It was concluded that the formulations with low concentrations of MDP (up to 9 wt%) showed better results for bond strength and bond strength degradation over time.

Dental Bonding; Dentin-Bonding Agents; Adhesives; Dental Marerials

Composition (by weight)	Application protocol
Basic composition consists of: 0.5% CQ, 1% DABE, 0.2% BHT, 10% ethanol, 10% HEMA, 15% TEGDMA, 25% Bis-EMA, 25% UDMA, and 12.85% Bis-GMA.	Etch-and-rinse	Self-etching
MDP% added to the basic composition: 0%, 3%, 9%, 12% or 15%	1. Apply 37% phosphoric acid (Condac 37, FGM, Joinville, SC, Brazil) for 15 s	1. Apply two adhesive layers
	2. Apply water spray and rinse conditioned areas thoroughly for 10 s	2. Disperse adhesive and remove solvent with dry air from an air-water syringe for 10 s
	3. Remove rinsing water with absorbent paper, without desiccating dentin	3. Light cure for 10 s
	4. Apply two adhesive layers
	5. Disperse adhesive and remove solvent with dry air from an air-water syringe for 10 s
	6. Light activate for 10 s

MDP concentration	pH	Application mode	Storage time

			24 h	6 months
0 wt% MDP	5.2	Etch-and-rinse	13.85 (9.40)^A	6.52 (3.43)^BCD
3 wt% MDP	4.3	Etch-and-rinse	11.55 (7.42)^AB	13.11 (4.60)^A
3 wt% MDP	4.3	Self-etch	4.40 (2.45)^BC	2.49 (1.20)^E
9 wt% MDP	3.2	Etch-and-rinse	18.94 (6.27)^A	9.62 (3.34)^AB
9 wt% MDP	3.2	Self-etch	5.92 (4.84)^BC	2.84 (1.86)^DE
12 wt% MDP	3.3	Etch-and-rinse	15.20 (5.71)^A	7.33 (2.72)^BC
12 wt% MDP	3.3	Self-etch	5.75 (3.20)^BC	3.81 (2.51)^CDE
15 wt% MDP	3.3	Etch-and-rinse	13.46 (5.21)^A	7.95 (2.36)^B
15 wt% MDP	3.3	Self-etch	2.64 (1.50)^C	1.74 (1.16)^E

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[1] Corresponding Author: Carla Castiglia Gonzaga E-mail: carlacgonzaga2@gmail.com