Analysis of adhesive bond strength under simulated pulpal pressure during laser irradiation on different dentin thicknesses / Análise da resistência adesiva sob pressão pulpar simulada durante irradiação laser em diferentes espessuras de dentina
Haddad, Bruno do Amaral; Silva, Tânia Mara da; Gonçalves, Lucélia Lemes; Silva, Mateus Rodrigues; Moreira Junior, Cláudio; Santis, Leandro Ruivo de; Gonçalves, Sérgio Eduardo de Paiva.
Braz. dent. sci
; 23(1): 1-7, 2020. tab
Artículo
en Inglés
| LILACS, BBO - odontología (Brasil) | ID: biblio-1049603
Objective:
Evaluate the microtensile bond strength (µTBS) in different dentin thicknesses, under simulated pulpal pressure (SPP), submitted to an adhesive technique using laser irradiation. Material andmethods:
Forty sound human molars were sectioned and randomly divided into two groups (n=20) Group 1 1 mm of dentin thickness; Group 2 2 mm of dentin thickness. Each group was divided into two subgroups (n=10) Subgroup A Absence of SPP; Subgroup P Presence of SPP (15 cm H2 O). The samples were sequentially treated with 37% phosphoric acid, adhesive system (Adper Single Bond 2), NdYAG laser irradiation (60 s, 1064 nm, 10 Hz) using 60 and 100 mJ/pulse energy parameters and photopolymerization (10 s). A composite resin block (Filtek Z350) was built up onto the irradiated area. After 30 days stored in water, the samples were sectioned and submitted to microtensile test (10 kgf load cell, 0.5mm/min). Data were analyzed by twoway ANOVA and Tukey tests.Results:
Two-way ANOVA revealed no significant differences for SPP on bond strength. The laser energy parameters indicated that 100 mJ showed greater µTBS means compared to the group irradiated with 60 mJ. The presence of SPP reduced the mean µTBS values.Conclusions:
Simulated pulpal pressure did not affect the µTBS using 60 mJ of laser energy parameter. At 100 mJ, the presence of SPP negatively influenced the bond strength, regardless of dentin thickness (AU)
Biblioteca responsable:
BR243.1
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