Banca de QUALIFICAÇÃO: ANA MARGARIDA DOS SANTOS MELO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANA MARGARIDA DOS SANTOS MELO
DATE: 31/10/2022
TIME: 08:00
LOCAL: DEPARTAMENTO DE ODONTOLOGIA on line
TITLE:

Dual-Cured Adhesive System Improves Adhesive Interfacial Properties of Dentin Cavities Restored with a Bulk-Fill Composite

Use of dual-cured adhesive systems in deep cavities

KEY WORDS:

Composite resins. Diatomaceous earth. Evaluation of mechanical properties. Toughness. Aging.

PAGES: 33
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Clínica Odontológica
SUMMARY:

After the advent of bulk-fill resins, characterized by their use in a single increment, the restorative composite containing diatomite in its inorganic content appeared, marketed as Zirconfill®. However, the scarcity of data that scientifically validate the benefits of diatomite for the physical properties of this composite resin makes it imperative to carry out new studies, especially regarding the use of Zirconhill in semi-direct restorations, whose indication requires materials that support masticatory loads. Objective: To evaluate in vitro the base/top hardness ratio (B/T) and push-out bond strength (RU) between a composite resin containing diatomite and a bulk-fill composite resin after 24 hours and after 6 months of aging in water. Materials and methods: Twenty-eight bovine incisors were used to produce conical dentinal cavities (4.8 mm x 2.8 mm x 4 mm) and C factor of magnitude 3.1. These cavity preparations (n=28) were restored with composite resins Filtek One Bulk Fill (BF) (3M ESPE) or Zirconfill (ZF) (BM4) through the semi-direct technique using the Scotchbond universal adhesive system (3M ESPE) and cement dual resin Relyx Ultimate (3M ESPE). The B/T analysis was performed with the aid of a Vickers microhardness tester and the RU was performed using the push-out test in a universal testing machine. All samples were stored in distilled water at 37 ºC for 24 hours, and the RU samples were also stored for 6 months. The B/T and RU data were submitted to one- and two-way analysis of variance (ANOVA), respectively, with Tukey's post-test (p <0.05). Results: There was no statistically significant difference between the composite resins in B/T. For the RU, analyzing each aging time separately, the ZF composite resin showed higher values than the BF resin. Evaluating over time, there was no statistically significant difference for any resin. Conclusion: Composite resin containing diatomite proved to be promising for use in semi-direct restorations, as it obtained similar results and sometimes even superior to bulk-fill composite resin, a material indicated for restorations in the posterior region.

 

COMMITTEE MEMBERS:
Presidente - 2292784 - ISAUREMI VIEIRA DE ASSUNCAO
Externo ao Programa - 1268184 - ANDERSON NICOLLY FERNANDES DA COSTA - UFRNExterno à Instituição - MOAN JÉFTER FERNANDES COSTA - UPE