Banca de QUALIFICAÇÃO: ANA MARGARIDA DOS SANTOS MELO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : ANA MARGARIDA DOS SANTOS MELO
DATA : 24/05/2018
HORA: 14:00
LOCAL: Departamento de Odontologia
TÍTULO:

Use of dual-cured adhesive systems and its impact on degree of conversion in situ, marginal adaptation, bond strength and nanoleakage of composites in dentin cavities

PALAVRAS-CHAVES:

Composite resin. Polimerization. Dental marginal adaptation. Dentin-bonding agents.

PÁGINAS: 20
GRANDE ÁREA: Ciências da Saúde
ÁREA: Odontologia
RESUMO:

The proper polymerization of adhesive system influences the mechanical properties and longevity of restoration. The effect of irradiance on the adhesive layer in deep cavities is still unknown, in which dual-cure adhesives may be a viable alternative. Objective: To evaluate the influence of the use of dual-cured adhesive systems cured in different ways on the degree of conversion on hybrid layer (GC), marginal adaptation (AM), bond strength (RU), failure pattern (PF) and nanoleakage (NN) of adhesive interfaces of restorations with composite resin in dentin cavities. Methods: High C-factor dentin cavities were prepared on 120 bovine incisors with maxicut burs in custom-made preparation, creating cavities with 4 mm of depth, which were then restored with the composites Filtek Z250 XT [XT], Filtek Bulk Fill [FB] and Filtek Bulk Fill Flow [FF] with the adhesives Single Bond Universal [SB], Adper Scotchbond Multiuso Plus cured [MPa] and the last one without photo-activation [MPd]. The GC analysis was performed in micro Raman, the AM with Caries Detector product and software Image J, the RU in a universal testing machine, the PF by eteroscopic magnifying glass and the NN in Scanning Electron Microscopy (MEV). GC, AM and RU data were analyzed by two-way analysis of variance and Tukey tests (p<0.05).  The other tests were qualitatively analyzed through descriptive statistics. Results: There was no statistically significant difference between top and bottom regions for any resin and any adhesive. In the top and bottom, for the same resin, MPd adhesive had higher GC, except for XT + MPd at the top and base and FW + MPd at the base. In both regions, for SB adhesive, only the FW resin decrease GC. The results for AM, RU, PF and NN are being processed. Conclusions: About the GC, we can conclude that for both resins tested, the traditional (XT) and Bulk fill (BF and FW), there was no difference in the top and bottom regions, which suggests that this property does not change with the indicated thickness of resin increments to each resin (2 mm for traditional and 4 mm in average for Bulk Fill). In both tested resins, GC was higher with the use of MP adhesive in the cured technique and, in the Bulk Fill resins, it was independent of the technique being cured before or after resin insertion, which gives us one more working option. The conclusions of the other analyzes (AM, RU, PF and NN) are being processed.

MEMBROS DA BANCA:
Presidente - 2292784 - ISAUREMI VIEIRA DE ASSUNCAO
Interno - 2966816 - MARILIA REGALADO GALVAO RABELO CALDAS
Externo ao Programa - 2220691 - MARIA CRISTINA DOS SANTOS MEDEIROS