Banca de DEFESA: Raquel Cardoso da Silva

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Raquel Cardoso da Silva
DATE: 03/07/2024
TIME: 14:00
LOCAL: Plataforma Teams
TITLE:

Evaluation of the Stability of Shearbond Strength (SBS) of Different Materials Used for the Repair of 3D-Printed Resin Crown

KEY WORDS:

Provisional crown, Repair, 3D Printed Resin, Shear Bond Strength

PAGES: 100
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

“Temporary restorations are used to maintain aesthetics and function during the fabrication of indirect restorations. They are subject to the masticatory stresses of the oral cavity and can suffer fractures, wear, and other conditions that necessitate repair. Therefore, the objective of this work was to evaluate the Shearbond Strength (SBS) of four materials used in repairs of temporary crowns produced by 3D printing, immediately and after thermocycling. The adhesive interface was evaluated by a shear test performed on a universal testing machine, with a 5 KN load cell, at a speed of 0.5 mm/min. Sixteen cylindrical discs were made from 3D printing resin for temporary crowns (18 x 3 mm), with repairs (RODs) performed using four different resins (n=8/each time): AutoPolymerizing Acrylic Resin (GA), Bis-Acrylic Resin (GB), Flow Resin (GFF), and Flow Resin (GFS), evaluated after 24 hours (T0) or after 10,000 thermocycling cycles (T1). Before the repair, the surfaces of the printed resins were polished. The blocks were stored in distilled water for 24 hours at 37°C or subjected to thermocycling testing prior to the shear test. The type of adhesive failure was evaluated. The shearbond strength data (MPa) were subjected to two-way Analysis of Variance (ANOVA) (repair material and time), followed by Tukey's test (p<0.05). There was an interaction between the factors evaluated (p<0.001). At T0 and T1, the GFS group showed the highest SBS values with a statistically significant difference compared to the other groups (GFF, GB, and GA), which differed from each other (p<0.05). SBS values decreased after thermocycling for each material (p<0.05) except for GA (p>0.05). Among the limitations of this study, it was observed that the type of repair material and time influenced the SBS values. Flow Resin (GFS) may be the most suitable material for repairing temporary crowns made from the evaluated 3D printing resin.

COMMITTEE MEMBERS:
Presidente - 3493627 - FERNANDA CRISTINA PIMENTEL GARCIA
Interna - 1877052 - LILIANA VICENTE MELO DE LUCAS REZENDE
Interno - 1843167 - LUCAS FERNANDO TABATA
Externo à Instituição - SICKNAN SOARES DA ROCHA - UFG