| Autor: |
Tsuzuki FM; Biomaterial and Biomedical Sciences Division, School of Dentistry, Oregon Health & Science University, 2730 S Moody Ave, Portland, Oregon 97201, United States.; Dental Materials, Piracicaba School of Dentistry, University of Campinas, Av. Limeira, 901, Piracicaba, SP 13414-903, Brazil., Logan MG; Biomaterial and Biomedical Sciences Division, School of Dentistry, Oregon Health & Science University, 2730 S Moody Ave, Portland, Oregon 97201, United States., Lewis SH; Biomaterial and Biomedical Sciences Division, School of Dentistry, Oregon Health & Science University, 2730 S Moody Ave, Portland, Oregon 97201, United States., Correr-Sobrinho L; Dental Materials, Piracicaba School of Dentistry, University of Campinas, Av. Limeira, 901, Piracicaba, SP 13414-903, Brazil., Pfeifer CS; Biomaterial and Biomedical Sciences Division, School of Dentistry, Oregon Health & Science University, 2730 S Moody Ave, Portland, Oregon 97201, United States.; Dental Materials, Piracicaba School of Dentistry, University of Campinas, Av. Limeira, 901, Piracicaba, SP 13414-903, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Sep 04; Vol. 16 (35), pp. 46005-46015. Date of Electronic Publication: 2024 Aug 23. |
| DOI: |
10.1021/acsami.4c07960 |
| Abstrakt: |
Purpose/Aim: Acrylamides are hydrolytically stable at pH lower than 2, and were shown to preserve bonded interface integrity with two-step, total etch adhesives. The objective of this study was to leverage those two characteristics in self-etching primers containing the acidic monomer 10-MDP and test the microtensile bond strength before and after incubation with S. mutans incubation. Materials and Methods: Acidic primers (10 wt % 10-methacryloyloxydecyl dihydrogen phosphate─10-MDP; 45 wt % N , N -diethyl-1,3-bis(acrylamido)propane─DEBAAP, or 2-hydroxyethyl methacrylate─HEMA; 45 wt %, glycerol-dimethacrylate─GDMA) and adhesives (DEBAAP or HEMA/10-MDP/UDMA 45/10/45 wt %) were made polymerizable by the addition of 0.2 wt % camphorquinone, 0.8 wt % ethyl-4-dimethylaminobenzoate, 0.4 wt % diphenyliodonium hexafluorophosphate, and 0.1 wt % butylhydroxytoluene. Nonsolvated materials were characterized for flexural strength (FS), modulus (E), toughness, water sorption/solubility (WS/SL), contact angle, and vinyl conversion (DC). Viscosity was evaluated after adding 20 and 40 vol % ethanol to the primer and adhesive, respectively. The experimental materials or Clearfil SE Bond (CC─commercial control) were used to bond a commercial composite (Filtek Supreme) to the flat surface of human dentin. Microtensile bond strength (MTBS) was tested in 1 mm 2 sticks for the 5 primer/bond combinations: CC (Clearfil Bond Primer and Bond), HH (HEMA/HEMA), DD (DEBAAP/DEBAAP), HD (HEMA/DEBAAP), and DH (DEBAAP/HEMA). Prior to testing, sticks were stored in water or biofilm-inducing culture medium with S. mutans for 1 week. Confocal images and FTIR-ATR evaluation evaluated the hybrid layer of the adhesives. Results were analyzed using Student's t -test (WS, SL, DC, contact angle, FS, E, toughness), one-way ANOVA/Tukey's test for viscosity, and two-way ANOVA/Tukey's test for MTBS (95%). Results: HEMA-based materials had lower contact angle ( p = 0.004), higher WS ( p < 0.001), and similar SL values compared to DEBAAP ( p = 0.126). FS ( p = 0.171) and E ( p = 0.065) dry values were similar, but after one week of water storage, FS/E dropped more significantly for HEMA materials. Dry and wet toughness was greater for DEBAAP ( p < 0.001), but it also had the greatest drop (46%). Clearfil bonds had the highest viscosity, followed by DEBAAP and HEMA, respectively ( p = 0.002). For the primers, HEMA had the lowest viscosity ( p = 0.003). As far as MTBS, all groups tested in water were statistically different when compared with HH ( p < 0.001). After storage in biofilm, DH had the highest MTBS value, being statistically different from HH ( p = 0.002), CC ( p = 0.015), and DD ( p = 0.027). Conclusions: The addition of a diacrylamide and its association with HEMA in self-etching adhesive systems provided greater bonding stability after bacterial challenge. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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