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Physicomechanical and antibacterial properties of experimental resin‐based dental sealants modified with nylon‐6 and chitosan nanofibers
Author(s) -
Hamilton María F.,
Otte Andrew D.,
Gregory Richard L.,
Pinal Rodolfo,
FerreiraZandoná Andrea,
Bottino Marco C.
Publication year - 2015
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.33342
Subject(s) - materials science , sealant , composite material , nanofiber , chitosan , chemical engineering , engineering
This study aimed to develop and evaluate resin‐based experimental dental sealants containing electrospun nylon‐6 (N6) and chitosan (CH) fibers in an attempt to improve the physicomechanical properties and provide an antibacterial protective effect, respectively. Electrospun N6 and CH mats were immersed into a resin mixture, light‐cured, and then cryomilled to obtain micron‐sized resin‐modified fiber particles. Different levels of the novel cryomilled particles (i.e. 1, 2.5, and 5% relative to the resin mixture, % by weight) were used to prepare the N6‐ and CH‐containing sealants. A commercial sealant and the experimental resin mixture (unfilled) were used as controls. Flexural strength (FS), Vickers microhardness (VH), and agar diffusion tests were performed. The data were analyzed at the 5% significance level. No significant difference in fiber diameter of N6 (503 ± 31 nm) and CH (595 ± 38 nm) was observed. Upon cryomilling, the resin‐modified CH and N6 mats led to the formation of irregularly‐shaped particles, with an average diameter of 14.24 µm and 15.87 µm, respectively. CH‐5% had significantly higher FS (115.3 ± 1.3 MPa) than all the other groups. CH‐1% had significantly higher hardness values (38.3 ± 0.3 VHN) than all the other groups. Collectively, the results indicated that CH‐containing sealants presented the highest FS and hardness; however, none of the CH‐containing sealants displayed antimicrobial properties. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 103B: 1560–1568, 2015.