Chitosan whiskers from shrimp shells incorporated into dimethacrylate-based dental resin sealant

Mahapoka, Ekamon; Arirachakaran, Pratanporn; Watthanaphanit, Anyarat; Rujiravanit, Ratana; Poolthong, Suchit

doi:10.4012/dmj.2011-071

Cited by 29 publications

(33 citation statements)

References 19 publications

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“…Molecular weight (MW) and degree of deacetylation (DA) vary among the different types of chitosan; factors that independently influence the antimicrobial activity of chitosan . The DA of the chitosan whiskers in the Mahapoka et al study was similar to the DA that is reported for PG chitosan used in our study (74% and ≥ 75%, respectively). However, the MW in their study was not reported and therefore may have been a lower MW than PG chitosan.…”

Section: Discussionsupporting

confidence: 82%

“…Chlorhexidine 0.12% solution was the only group that demonstrated an inhibition zone during the time of the study (data not shown). Contradictory results were observed by Mahapoka et al, who using the method of the agar diffusion, reported inhibition against (UA 159) S. mutans when 2% by weight of chitosan nanowhiskers was introduced into experimental resin‐based sealants. Possible explanations for the discrepancy of our results can be due to the type of chitosan used, and the actual amount of chitosan available to interact with the bacteria.…”

Section: Discussionmentioning

confidence: 92%

“…The overall results indicated that the CH groups exhibited significantly higher FS and hardness than any other group. Chitosan fibers are low‐rigidity materials, unable to sustain force loading . However, due to its high aspect ratio, it might allow for a more efficient transfer of stresses along the fibers .…”

Section: Discussionmentioning

confidence: 99%

“…Chitosan fibers are low‐rigidity materials, unable to sustain force loading . However, due to its high aspect ratio, it might allow for a more efficient transfer of stresses along the fibers . Furthermore, the higher FS and hardness values obtained by the chitosan groups may be explained by interfacial bonding between fibers and matrix.…”

Section: Discussionmentioning

confidence: 99%

“…Prior to testing, the samples were disinfected by exposing them to 70% ethanol solution for 30 min. For the agar diffusion test, modification of a published antibacterial assay was followed …”

Section: Methodsmentioning

confidence: 99%

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Physicomechanical and antibacterial properties of experimental resin‐based dental sealants modified with nylon‐6 and chitosan nanofibers

et al. 2014

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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.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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