11 Questions
What is the approximate flexural strength of glass-, silica-, or quartz-fiber posts?
1000 MPa
What is the primary advantage of using quartz-fiber posts over carbon fiber posts?
All of the above
What is the purpose of silanization, hydrofluoric etching, and sandblasting in the preparation of fiber posts?
To improve the bonding at the post/core/cement interfaces
What is the effect of using light-transmitting posts on the polymerization of resin-based luting cements?
It enhances the polymerization of resin-based luting cements
What is the typical flexural modulus of glass-, silica-, or quartz-fiber posts?
23 GPa
What is the effect of silanization, hydrofluoric etching, and sandblasting on the mechanical properties of different glass-, silica-, or quartz-fiber posts?
They do not modify the mechanical properties
What is a benefit of bonding fiber posts to root canal dentin?
Improved distribution of forces along the root, thereby decreasing the risk of root fracture
What was the failure rate of 1306 fiber posts in a retrospective study?
3.2%
What was the survival rate of parallel-sided fiber posts in anterior teeth covered with full-ceramic crowns?
98.6%
What was the mean observation period in a study on fiber posts in anterior teeth covered with full-ceramic crowns?
5.3 years
What type of teeth were covered with full-ceramic crowns in a study on fiber posts?
Anterior teeth
Study Notes
Fiber Posts
- Originally, fiber posts consisted of carbon fibers embedded in epoxy resin, but quartz-fiber posts are now preferred.
- Quartz-fiber posts have favorable mechanical properties, esthetic qualities, and can chemically bond to the polymer matrix.
Mechanical Properties
- The flexural strength of glass-, silica-, or quartz-fiber posts is approximately 1000 MPa.
- The flexural modulus of glass-, silica-, or quartz-fiber posts is about 23 GPa.
Radiopacity and Light Transmission
- Current fiber posts are radiopaque.
- They can also conduct light for polymerization of resin-based luting cements.
- Light-transmitting posts result in better polymerization of resin composites in the apical area of simulated root canals, as measured by hardness values.
Post/Core/Cement Interfaces
- Physicochemical pretreatments such as silanization or sandblasting of the post surface can enhance bonding at the post/core/cement interfaces.
- Silanization, hydrofluoric etching, and sandblasting (with 30 to 50 μm Al2O3) do not modify the mechanical properties of different glass-, silica-, or quartz-fiber posts.
Bonding Fiber Posts to Root Canal Dentin
- Bonding fiber posts to root canal dentin can improve the distribution of forces along the root, reducing the risk of root fracture and reinforcing the remaining tooth structure.
- A retrospective study of 1306 fiber posts found a 3.2% failure rate after 1 to 6 years of recall.
- A more recent study reported a 98.6% survival rate for parallel-sided fiber posts and a 96.8% survival rate for tapered fiber posts in anterior teeth covered with full-ceramic crowns after a mean observation period of 5.3 years.
This quiz covers the properties and characteristics of fiber posts used in dentistry, including their composition, mechanical properties, and esthetic qualities.
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