Influence of metacryloxydecyl dihydrogen phosphate and water on the degree of conversion of adhesives containing a three-component photoinitiator

Author(s)

Narimatsu, Mayara Hana ^[1] ; Neto, Constantino Fernandes ^[1] ; Da Costa, Reginaldo Mendonca ^[1] ; Wang, Linda ^[1] ; Soares Bombonatti, Juliana Fraga ^[1] ; Furuse, Adilson Yoshio ^[1]

Affiliation

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Alameda Dr Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES; v. 111, DEC 2021.
• Web of Science Citations: 0

Abstract

While self-etching dental adhesives are considered user friendly, their application is still technique-sensitive, especially considering the need of solvent evaporation during clinical used and the presence of water on the dentin substrate. The present study aimed to evaluate the influence of 10-metacryloxydecyl dihydrogen phosphate (10-MDP) concentration on the degree of conversion (DC) of adhesives containing a three-component photoinitiator under distinct manipulation protocols. Adhesives containing a three-component photoinitiator system (camphorquinone/1.2-diaminobenzene/iodonium salt) were prepared and different 10-MDP concentrations were added (0 wt%, 3 wt%, 6 wt%, 9 wt%, 12 wt%, and 15 wt%). Four protocols were evaluated: I) Control (without manipulation), II) 5 s of solvent evaporation with compressed air, III) 20 s of evaporation, and IV) addition of water to the adhesive to simulate the humidity of dentin in the oral environment. DC was evaluated by FTIR-ATR. Each adhesive (approximate to 12 mu L, n = 12) was dropped and tests were run before and after light-activation. Data were analysed with two-way ANOVA and Tukey's HSD (alpha = 0.05). Adhesives and protocols were statistically significant factors, as well as their interaction (p < 0.0001). The analysis of interaction indicates that 12% 10-MDP adhesive with water addition presented the highest DC with 92.79%, while the 10-MDP-free adhesive with 20 s evaporation had the lowest DC of 70.75%. The presence of water has increased DC for all groups, except for the MDP-free adhesive. These results suggest that 10-MDP can adjunctively increase the DC of three-component-photoinitiator adhesive and water did not seem to affect the DC in the presence of such monomer. (AU)

• FAPESP's process: 19/05427-9 - Dental adhesives modified by TiO2 nanotubes as carriers of enzyme inhibitors: synthesis, functionalization and incorporation of nanotubes and evaluation of enzymatic activity physico-chemical, mechanical and biological properties
• Grantee: Adilson Yoshio Furuse
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/12900-7 - Influence of adhesives containing different photoinitiators and monomeric mixtures on shear bond strength of a resin cement to zirconia
• Grantee: Constantino Fernandes Neto
• Support Opportunities: Scholarships in Brazil - Scientific Initiation