Banca de DEFESA: NATHALIA RAMOS DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : NATHALIA RAMOS DA SILVA
DATE: 24/08/2022
TIME: 08:30
LOCAL: DEPARTAMENTO DE ODONTOLOGIA-SALA DE AULAS DO SETOR DE PRÓTESE
TITLE:

Adhesive cementation of glass ceramics for CAD/CAM: effect of the type of adhesive system and long-term aging  on the bond strength to resin cement

KEY WORDS:

Ceramics; Dental materials; Dentin-Bonding Agents.

PAGES: 28
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Clínica Odontológica
SUMMARY:

The aim of this study is to evaluate the effect of the type of adhesive system and aging on the wettability and bond strength of glass ceramics to resin cement. Lithium silicate (SL - Celtra Duo, Dentsply Sirona), feldspathic (FD - Vita Mark II, VITA Zahnfabrik) and polymer-infiltrated ceramic (PIC - Vita Enamic, VITA Zahnfabrik) blocks were sectioned (N=96, 10 x 12 x 2 mm), included and randomly divided into 24 groups according to the factors: “Ceramics” (SL, FD and PIC), “Adhesive” (CONT–control without adhesive; C2P–conventional 2-step adhesive; C3P–adhesive conventional 3-step; UNV–universal adhesive) and “Aging” (SE-non-aged; CE-aged). After the ceramic treatment, cylinders (n=15, Ø = 2 mm and height = 2 mm) of resin cement (RelyX Ultimate, 3M ESPE) were made (4 cylinders/block) and half of the samples were stored in distilled water at 37°C for 24h (SE) and half were subjected to thermocycling 10,000 cycles and storage in water at 37°C for 18 months (EC). Then, the samples were submitted to the shear bond strength test with wire (RUC - 100 KgF, 1 mm/min), failure analysis, contact angle measurement and interface analysis by means of scanning electron microscopy (SEM). RUC (MPa) and contact angle data were analyzed by 2-way ANOVA and 1-way ANOVA, respectively, and Tukey (5%). Weibull analysis was performed for RUC. 2-way ANOVA revealed that the “Adhesive” factor was significant only for SL (p<0.0001) and FD (p=0.0079) ceramics. The Adhesive/Aging interaction (p=0.0015) and “Aging” (p=0.0008) were significant only for SL. For SL, after aging, the CE_UNV (22.18± 7.74CD) and CE_C2P (17.32± 5.86D) groups were lower than the control (30.30± 6.11A). Only the UNV group showed a significant decrease after aging. For FD, C2P had the lowest RUC in relation to the other groups. PIC showed similarity of RUC between all groups. The UNV contact angle presented the lowest value for SL (55.27°) and FD (51.34°). For PIC, C3P presented the highest angle (63.00°) and CONT the smallest (49.83°). Therefore, the application of an adhesive was not beneficial for ceramic-cement adhesion. Furthermore, the use of C2P and UNV after silanization of SL and C2P ceramics for FD should be evaluated with caution, as the bond strength was reduced compared to the control group after aging.

COMMITTEE MEMBERS:
Presidente - 1640419 - RODRIGO OTHAVIO DE ASSUNCAO E SOUZA
Interna - 1459400 - ADRIANA DA FONTE PORTO CARREIRO
Externa ao Programa - 2492886 - SAMIRA ALBUQUERQUE DE SOUSA - UFRNExterna à Instituição - DAYANNE MONIELLE DUARTE MOURA - UERN
Externa à Instituição - RENATA MARQUES DE MELO - UNESP