Cimentação adesiva de cerâmicas vítreas para CAD/CAM: efeito do tipo de sistema adesivo e do envelhecimento em longo prazo na resistência de união ao cimento resinoso
The aim of this study was to evaluate the effect of the type of adhesive system and aging on the wettability and bond strength of glass ceramics to resin cement. Lithium silicate (SL - Celtra Duo, Dentsply Sirona), feldspathic (FD - Vita Mark II, VITA Zahnfabrik) and polymerinfiltrated ceramic (PI...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/49940 |
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| Resumo: | The aim of this study was to evaluate the effect of the type of adhesive system and aging on the
wettability and bond strength of glass ceramics to resin cement. Lithium silicate (SL - Celtra
Duo, Dentsply Sirona), feldspathic (FD - Vita Mark II, VITA Zahnfabrik) and polymerinfiltrated ceramic (PIC - Vita Enamic, VITA Zahnfabrik) blocks were sectioned (N=96, 10 x 12 x 2 mm), included and randomly divided into 24 groups according to the factors: “Ceramics” (SL, FD and PIC), “Adhesive” (CONT–without adhesive; C2P–conventional 2-step adhesive; C3P–adhesive conventional 3-step; UNV–universal adhesive) and “Aging” (SE-non-aged; CEaged). After the conditioning of the ceramics (HF 5%), silanization and application of the
adhesive system according to the experimental group, cylinders (n=15, Ø = 2 mm and height =
2 mm) of resin cement (RelyX Ultimate, 3M ESPE) were made (4 cylinders/block) and half of
the samples were stored in distilled water at 37°C for 24h (SE) and half were subjected to
thermocycling 10,000 cycles and storage in water at 37°C for 18 months (EC). Then, the
samples were submitted to the shear bond strength test (RUC - 100 KgF, 1 mm/min), failure
analysis, contact angle measurement and interface analysis by means of scanning electron
microscopy (SEM). RUC (MPa) and contact angle data were analyzed by ANOVA 2-way and
ANOVA 1-way, respectively, and Tukey (5%). Weibull analysis was performed for RUC.
ANOVA 2-way revealed that the “Adhesive” factor was significant only for SL (p<0.0001) and
FD (p=0.0079) ceramics. The Adhesive/Aging interaction (p=0.0015) and “Aging” (p=0.0008)
were significant only for SL. For SL, after aging, the CE_UNV (22.18± 7.74CD) and CE_C2P
(17.32± 5.86D) groups were lower than the control (30.30± 6.11A). Only the UNV group
showed a significant decrease after aging. For FD, C2P had the lowest RUC in relation to the
other groups. PIC showed similarity of RUC between all groups. The UNV contact angle
presented the lowest value for SL (55.27°) and FD (51.34°). For PIC, C3P presented the highest
angle (63.00°) and CONT the smallest (49.83°). Therefore, the application of an adhesive was
not beneficial for the adhesion of the ceramic to the resin cement. Furthermore, the use of C2P
and UNV after silanization of SL and C2P ceramics for FD should be evaluated with caution,
as the bond strength was reduced compared to the control group after aging. |
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