Avaliação de diferentes sistemas adesivos na resistência de união da dentina após selamento dentinário imediato
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2019-08-29
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Universidade Federal de Goiás
Resumo
Immediate Dentin Sealing (IDS) decreases postoperative sensitivity, gaps formation and
improves bond strength in indirect restorations. The technique suggests the application of a
three-step or a self-etch adhesive system immediately dentin exposure. Several adhesive
systems are available in market; however, they do not exhibit the same mechanical
performance. An alternative that seems to improve bond strength is using a flowable resin
layer (Bulk Fill) soon after hybridization. This work evaluated the bond strength of five
adhesive systems (Optibond FL, Scotchbond MP, Clearfil SE and Scotchbond U, Adper Single
Bond II) with Delayed Dentin Sealing (DDS), IDS or IDS with flowable resin (SDI + F). Once
approval was obtained from ethics committee of Federal University of Goiás, seventy-five
molars were randomly distributed in fifteen groups (n = 5). The crowns were sectioned in the
mesio-distal direction, finished with 600-grit Sic papers for surface regulation and cleaned
with pumice and water. Samples with IDS and IDS + F were immediately hybridized after the
initial cut, impression taken and stored in artificial saliva for two weeks at 37 °C prior to final
restoration (Z100). In samples with DDS, were subjected to the same procedures, however
the application of the adhesive system was done after two weeks in artificial saliva at 37ºC.
After final restorations, all samples were stored in distilled water at 37 °C for at least 24
hours. Each tooth was cut into beans with thickness of 1mm² cross-section and subjected into
universal machine test for microtensile stress in 0,5m/min failure (in MPa). Sealing dentin
immediately after cutting significantly improved the adhesion of all tested systems. The use of
flowable resin layer after dentin hybridization seems to be an effective technique for different
adhesive systems and an alternative to the gold standard Optibond FL.
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POLONIAL, I. F. Avaliação de diferentes sistemas adesivos na resistência de união da dentina após selamento dentinário imediato. 2019. 73 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2019.