Banca de DEFESA: PAULA TAMIÃO ARANTES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PAULA TAMIÃO ARANTES
DATE: 13/12/2019
TIME: 14:00
LOCAL: AUDITÓRIO DO DEPARTAMENTO DE ODONTOLOGIA
TITLE:

In vitro evaluation of the influence of root canal sealers in bond strength on dentin floor structure of the pulp chamber of tooth restored immediately after filling and mediately

KEY WORDS:

Endodontic sealers, restorative materials, adhesive systems

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

The purpose of this study is to evaluate the influence of endodontic cements on bond strength on the dentin structure of the pulp chamber walls of restored bovine teeth immediately and immediately after obturation, in which endodontic cements will be evaluated: Calcium hydroxide resin cement - AH Plus and Zinc Oxide and Eugenol Cement - Endofill. The adhesives that will be tested to evaluate the bond strength will be the Single Bond 2® and the self-etching 2-step adhesive system, using Z 350 ® composite resin as a restorative material. After preparation of the teeth, they will be sectioned horizontally, separating the crown from the root as well as the incisal part, and then sectioned in the mesiodistal direction so that only the pulp chamber area is exposed. The samples will be divided into 8 experimental groups and 4 controls. The experimental groups will present the variables, endodontic cement, adhesive system and immediate and immediate restoration (7 days after endodontics), and the controls will not suffer interference from endodontic cements. Endodontic treatment will be simulated by irrigation with 2.5% sodium hypochlorite solution for 30 minutes, changing the solution every 5 minutes, then washed with 5 ml of 0.9% saline solution and chambers. pulp will be in contact with 17% EDTA solution for 3 minutes, then re-irrigated with 5 ml of saline with syringe and then dried. Both zinc oxide and eugenol-based cements such as AH Plus will be handled according to the manufacturer's instructions, inserted into the pulp chamber for 10 minutes, followed by wiping with a 70% alcohol-soaked cotton ball minute and then drying it. The Experimental Mediata restoration groups will be kept in a closed container, covered with gauze soaked in 0.9% saline solution, for hydration on the buccal surface until restoration after 7 days. The samples will have the pulp chamber dentin conditioned according to each adhesive system following manufacturer's instructions. Then, the restorative treatment will be performed inserted 3 layers of 1.0 mm each, light cured for 20 seconds each and at the end for 40 seconds. After waiting for storage at 37ºC, the teeth will be fixed and positioned on the ISOMET 1000 cutting equipment, and cuts will be made to obtain sticks of +/- 1.0 mm² and then the microtensile test will be performed, positioning them. the area of adhesion perpendicular to the long axis of traction. The speed of the microtensile tests will be 1.0mm / min, performed with a Universal Testing Machine with adaptation of a 250KN Load cell and software for data reading and subsequent calculation. Fractured specimens will be observed first under an optical microscope by the magnifying glass methodology for fracture type classification: Cohesive in hybrid layer, cohesive in composite resin, cohesive in dentin, or mixed being in two or more substrates: cohesive in hybrid layer, cohesive. in composite resin, cohesive in dentin or mixed in two or more substrates. The measures of the ratio between the average rupture load values in Newton (N), by the cross sections of the area delimited by the toothpick preparation, expressed in Mpa and the type of fracture we have as dependent variables. The values of the bond strength will be calculated in Mpa, and the data evaluated by the three-factor analysis of variance and for the multiple comparisons the Tukey-Kramer post-test for different sample sizes. All statistical calculations will be performed using the SPSS version 15.0 program at a significance level of 5%.

BANKING MEMBERS:
Presidente - 1879551 - FABIO ROBERTO DAMETTO
Externo ao Programa - 3154835 - CICERO ROMAO GADE NETO
Externa ao Programa - 1059162 - LETICIA MARIA MENEZES NOBREGA
Externa à Instituição - LUANA MARIA MARTINS DE AQUINO - F.M.Nassau
Externo à Instituição - REINALDO DIAS DA SILVA NETO - F.M.Nassau