Banca de QUALIFICAÇÃO: DÉBORA MICHELLE GONÇALVES DE AMORIM

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : DÉBORA MICHELLE GONÇALVES DE AMORIM
DATE: 03/02/2021
TIME: 08:00
LOCAL: Plataforma Google Meet
TITLE:

DENTIN BONDING DURABILITY AND CALCIUM RELEASE PROMOTED BY EXPERIMENTAL ADHESIVE SYSTEMS CONTAINING CALCIUM HYDROXIDE

KEY WORDS:

self-etch adhesives, calcium hydroxide, bond strength

PAGES: 33
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

This study aimed to evaluate the impact of adding different levels of calcium hydroxide on the durability of bonding to dentin and the release of calcium from experimental self-etch adhesives systems. Methods: Four adhesives systems were formulated from the components UDMA, HEMA, GDMA-P, TPO, diphenyl iodonium, ethanol and water with different mass fractions of calcium hydroxide: 0% (control), 1%, 2% and 4 %. For the calcium release test, disks (5 mm in diameter x 1 mm in thickness) were made (n = 4) and immersed in distilled water. Calcium concentration was measured after 3h, 24h, 48h, 72h, 96h, 120h, 144h and 168h using a spectrophotometer. To analyze the durability of the dentin bond, 24 third molars (n = 6) were used. The middle third dentin was exposed, the adhesive systems were competent and 2 increments of composite resin and photoactivated. After 24 h of immersion in distilled water, the toothpicks were cut. Half of them were submitted to the bond strength test by micro traction in a universal testing machine (OM-150) and the other half stored in distilled water for 12 months for subsequent assessment of the bond strength. The bond strength data were statistically obtained through the ANOVA 2-factor tests and Tukey's post-test (p <0.05). The eluate pH was analyzed descriptively. In the bond strength test, there were statistically significant differences between storage times (p = 0.001). Only the material containing 2% of calcium highlighted a statistically significant increase in bond strength after 12 months of storage in water. The others maintained statistically similar values between storage times. All adhesive systems released calcium amounts below 1 ppm. Therefore, the inclusion of 2% calcium hydroxide in self-etching adhesive systems is an alternative to increase the longevity of the dentin bond.

BANKING MEMBERS:
Presidente - 2042290 - BONIEK CASTILLO DUTRA BORGES
Externa ao Programa - 1247082 - DIANA FERREIRA GADELHA DE ARAUJO
Externa ao Programa - 2966816 - MARILIA REGALADO GALVAO RABELO CALDAS