Esthetic Fiber Post System
Esthetics and strength...not from your metal post system. Achromat™ Esthetic Fiber Posts Feature:
- High strength and low elastic modulus for mechanical compatibility with dentin.
- Tooth-colored, for optimal esthetics, especially under all-ceramic crowns.
- Serrated and machined surface to provide maximum surface area and bond ability.
- Radiopaque, for diagnostic accuracy.
- Made of the highest-quality fibers, for high flexural strength.
- Bonded, rather than cemented, for extra retention and low solubility.
- Cannot corrode like stainless steel; for real long-term biocompatibility.
- Available in 2 styles.
The Fibers Make the Difference
The volume, quality and treatment of the raw fibers used directly influence the mechanical properties and performance of the post. Generally, the higher the fiber content, the greater the post’s flexural strength and fatigue resistance. These are very important distinctions in clinical function and for the long-term behavior of the restoration. Note the differences below between the Achromat™ Esthetic Fiber Post and competitive posts, which also exhibit voids, resulting in a post that is not as strong.
Retention: The Purpose of the Post
According to the textbooks, the primary purpose of a post is to retain the core/crown assembly. The Achromat™ Esthetic Fiber Post has it all. The surface of the post is machined (Figure 1) to provide micro-mechanical retention with adhesive bonding agents. The overall design of the Achromat™ is macro-retentive; parallel-sided, with retention rings to lock-in the resin cement and core composite (Figure 2). There’s even a vertical vent-slot (Figure 3), for excess cement to escape. The Achromat-HP™ version features an “arrowhead-shaped” retention head (Figure 3), which creates macro-retentive undercuts to grip and hold the core material. This “arrowhead” design head saves time and materials in the core build-up procedure.
Less Stress Transfer = The Best Results
Finite Element Analysis (FEA), using computer programs, permits prediction of clinical behavior of the restoration technique with the variation of the characteristics of the materials being used. The greater the difference between the Young’s Modulus of Elasticity (rigidity) of the dentin and the post, the more uneven the stress distribution on the dentin surfaces, resulting in the formation of stress concentration areas represented by red, orange, and yellow.