Banca de DEFESA: JOSELÚCIA DA NÓBREGA DIAS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSELÚCIA DA NÓBREGA DIAS
DATE: 17/12/2020
TIME: 19:00
LOCAL: PLATAFORMA REMOTA
TITLE:

Title: Effect of variance surface treatments, resin cement and aging time on interfacial characteristics and bonding durability of semi-direct restorations.

KEY WORDS:

Adhesiveness, Resin cements, Dental restoration failure.

PAGES: 50
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Clínica Odontológica
SUMMARY:

Abstract

Introduction: The semi-direct technique can be an excellent treatment option for deep and extensive posterior teeth restorations due to the technical difficulties in the use of direct composite resin, as well as the higher cost and time of treatment of indirect restorations. Aim: The aim of this study was to evaluate the effect of different surface treatments, cement types and aging times on the interfacial characteristics and bonding durability of semi-direct restorations. Method: 320 bovine incisors (n = 320) were used, from which 4.0 mm discs were obtained and in its most central portion, a conical cavity preparation with 4.8 mm of over diameter and 2.8 mm of under diameter was made. Samples were divided into 16 groups according to resin cement, surface treatment and aging time: ULT 24hs, ULT + S 24hs, ULT + SB 24hs, ULT + S + SB 24hs, U200 24hs, U200 + S 24hs, U200 + SB 24hs, U200 + S + SB 24hs, ULT 6m, ULT + S 6m, ULT + SB 6m, ULT + S + SB 6m, U200 + S 6m, U200 + SB 6m, U200 + S + SB 6m. The tests performed were: Marginal Adaptation (AM), Nanoleakage (NL) and Push Out Extrusion Bond Strength (BS). Data were analyzed using descriptive and inferential statistics using Two Way ANOVA with Tukey Post Hoc (p <0.005). Result: For BS, there was a statistically significant difference between resin cement types, surface treatments and aging times (p <0.005), with the best performance for RelyX Ultimate Cement and the use of SB assurface treatment. In fractographic analysis (PF), RelyX Ultimate Cement presented the highest percentage of mixed failure in both aging times and when used in combination with SB or S + SB as surface treatment. In the evaluation of NL, there was a greater presence of nanoleakage at the base of the restorations in relation to the top. The lowest incidence of nanoleakage was observed when S + SB was used as surface treatment in both aging times and for both resin cements. The data regarding AM are still under analysis and will be presented later. Conclusion: According to the results found in this laboratory study, the use of universal Single Bond as surface treatment and self-etching resin cement (RelyX Ultimate) for semi-direct restorations is suggested.

BANKING MEMBERS:
Presidente - 2292784 - ISAUREMI VIEIRA DE ASSUNCAO
Interna - 1459400 - ADRIANA DA FONTE PORTO CARREIRO
Externo ao Programa - 1645492 - ALEX JOSE SOUZA DOS SANTOS
Externa à Instituição - ANA KARINA MACIEL DE ANDRADE - UFPB
Externo à Instituição - ISABELA PINHEIRO CAVALCANTI LIMA - UERN