IADR Abstract Archives

Universal adhesives MDP-containing improve bonding effectiveness associated with shortening etching time.

Objectives: The effect of different etching times using four commercial phosphoric acids on calcium (Ca) content into demineralized dentin matrix, the resin-dentine microtensile bond strength (μTBS) and nanoleakage (NL) using an MDP-containing or a MDP-free universal adhesive.
Methods: The phosphoric acid were used: Ultra-etch [ULE], Scotchbond Universal Etchant [SUE]; Dentsply Dental Conditioner [DDC] and Total Etch [TTE]. For Ca-content into demineralized dentin matrix, mid-coronal human dentine slices were etched for 3 s or 15 s and evaluated by energy-dispersive X-ray (EDX). Slices with no etching procedure (0 s) were used such control. The phosphoric acids (1 ml) were titrated by adding successive 1 ml drops of NaOH (0,08N). For μTBS and NL, flat dentine surfaces were etched for 3 s or 15 s. After that, an MDP-containing universal adhesive (Scotchbond Universal [SBU] and a MDP-free universal adhesive (Peak Universal Bond [PUB] were applied to flat dentine surfaces, composite resin build-ups and specimens were sectioned to obtain resin–dentine sticks. μTBS and NL were evaluated after 24h of water storage. ANOVA and Tukey’s test were applied (α = 0.05).
Results: Ca content decreased significantly for all acids at times 3 and 15 s respectively when compared with the control time (0 s). Higher μTBS values were observed for ULE and SUE; the nanoleakage regarding to the acid type, lower NL values were observed for ULE and SUE mainly when compared to DDC and TTE , except for 3 s etching time for PUB adhesive, where DDC was similar to ULE and SUE. Regarding to the adhesive type, lower NL values were observed for SBU when compared to PUB.
Conclusions: The ULE and SUE acids were less aggressive avoiding overreaching dentin mainly with the shortening etching time associated with MDP-containing adhesive improved bonding effectiveness.

2021 Chilean Division Annual Meeting (Virtual) 2021

2021

Dental Materials 4: Adhesion
  • Núñez, Alejandra  ( UEPG , Ponta Grossa , Paraná , Brazil ;  USFQ , Quito , Ecuador )
  • De Souza, Jullian  ( UEPG , Ponta Grossa , Paraná , Brazil )
  • Méndez-bauer, Luján  ( UEPG , Ponta Grossa , Paraná , Brazil ;  Universidad Francisco Marroquin , Guatemala , Guatemala )
  • Gutierrez, Felipe  ( Universidad de los Andes , Santiago , Región Metropolitana , Chile )
  • Gomes, João Carlos  ( UEPG , Ponta Grossa , Paraná , Brazil )
  • Loguercio, Alessandro  ( UEPG , Ponta Grossa , Paraná , Brazil )
  • NONE
    CNPq
    Poster Session
    Posters 2