Related Experiment Video
Updated: Jan 23, 2026
09:46
Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators
Published on: August 8, 2025
1.2K
High strength polymer/silicon nitride composites for dental restorations
Feng Wang1, Jingshu Guo2, Ke Li2
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China; NTNU Nanomechanical Lab, Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway.
Summary
This study developed a polymer-infiltrated silicon nitride composite (PISNC) for dental use. The PISNC demonstrated superior mechanical properties and good cell compatibility, making it a promising dental material.
Area of Science:
- Biomaterials Science
- Ceramic Engineering
- Dental Materials
Background:
- Silicon nitride (Si3N4) ceramics offer high strength but can be brittle.
- Polymer infiltration can enhance the mechanical properties and biocompatibility of ceramic scaffolds.
- Dental applications require materials with excellent mechanical strength, durability, and biocompatibility.
Purpose of the Study:
- To fabricate a novel polymer-infiltrated silicon nitride composite (PISNC).
- To evaluate the mechanical properties of the PISNC.
- To assess the cytocompatibility of the PISNC for potential dental applications.
Main Methods:
- Fabrication of porous Si3N4 ceramics via gelcasting and sintering.
- Polymer infiltration and curing to create PISNC.
- Mechanical testing (flexural strength), SEM for microstructure, EDS for phase distribution, and cell culture studies (HGFs, IL-6 release via ELISA) for cytocompatibility assessment.
Main Results:
- Porous Si3N4 ceramics exhibited porosity from 45.1-49.3% and strength of 171.8-262.3 MPa.
- PISNC showed a bicontinuous structure with significantly enhanced mechanical properties (porosity 1.94-2.28%, strength 273-385.3 MPa).
- PISNC improved human gingival fibroblast (HGF) adhesion and spreading compared to PMMA, with comparable IL-6 release.
Conclusions:
- The developed PISNC exhibits a favorable combination of high mechanical strength and good cytocompatibility.
- The PISNC demonstrates potential as a superior alternative to existing materials for dental restorations.
- This composite is a promising candidate for high-load medical applications beyond dentistry.
Related Concept Videos
02:34Polymers
40.5K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.5K
01:19Restorative Care
2.4K
Restorative care is provided once a patient has been discharged from a healthcare facility and requires additional services. The additional services include home care, rehabilitation programs, and extended care. Restorative care centers help the patient regain their previous level of functioning or acquire a new level of functioning due to the incapacitating effects of a disease or a disability. It aims to assist patients in enhancing their quality of life by encouraging independence,...
2.4K
03:05Acid Strength and Molecular Structure
32.9K
Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
32.9K
01:20Strength of Cement
476
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
476
03:35Classifying Matter by Composition
89.9K
Matter: Pure Substances and Mixtures
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...
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...
89.9K
01:30Relation Between Tensile Strength and Compressive Strength of Concrete
658
Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
658