Related Experiment Video
Updated: Feb 2, 2026
Author Spotlight: Exploring the Antibacterial Effects of Zinc Oxide Nanoparticles in Overcoming Antibiotic Resistance
Published on: September 27, 2024
Strong antibacterial dental resin composites containing cellulose nanocrystal/zinc oxide nanohybrids
Yazi Wang1, Hongfei Hua2, Wei Li1
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Objective:
The aim is to explore the reinforcing and antibacterial effect of cellulose nanocrystal/zinc oxide (CNC/ZnO) nanohybrids on dental resin composites (DRCs).
Methods:
CNC/ZnO nanohybrids were prepared through precipitating Zn2+ on the surface of CNC and then introduced into the DRCs. The mechanical properties of DRCs including compressive strength, flexural modulus, flexural strength, and Vickers microhardness were characterized. The antibacterial activity of DRCs to Streptococcus mutans was determined and the morphology of Streptococcus mutans on the surface of DRCs after incubation was observed. The morphology of fractured surface after flexural test and Zn content in DRCs were analyzed.
Results:
Compared with DRCs without CNC/ZnO nanohybrids, DRCs containing 2 wt.% CNC/ZnO nanohybrids possess higher compressive strength and flexural modulus and there is no significantly statistical difference (P＞0.05) on the flexural strength and Vickers microhardness. The excess use of CNC/ZnO nanohybrids decreases the mechanical properties of DRCs except flexural modulus. DRCs containing CNC/ZnO nanohybrids show excellent antibacterial properties and a 78% reduction in bacterial number is obtained when 2% CNC/ZnO nanohybrids are added.
Conclusion:
The small amounts of CNC/ZnO nanohybrids have a positive influence on the mechanical and antibacterial properties of DRCs.
Significance:
The prepared DRCs are promising to address bulk fracture and secondary caries.
Related Concept Videos
03:22Strong Acid and Base Solutions
02:28Titration Calculations: Strong Acid - Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
01:23Titration of a Strong Acid with a Strong Base
03:14Oxidation Numbers
03:35Classifying Matter by Composition
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures.
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated.
A mixture is composed of two or...
01:15Cellulose and Pectic Polysaccharides
As a cell matures, its cell wall specializes according to its type. For example, the...