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The Fortress all-ceramic
system offers the translucency, vitality, low abrasion and fit you have
been looking for in crowns, inlays, onlays and veneers - without requiring
the core material of other systems. Proven over decades of research, with
Fortress you don't have to sacrifice strength to achieve the esthetic
beauty your patients demand. Truly Natural
Esthetics
Fortress allows the reproduction of the entire tooth color spectrum through
shading and fine-tuning the translucency of the restoration. The absence
of a core means the technician can build the colors into the porcelain
throughout its entire depth. The esthetic capabilities of the material
are virtually unlimited due to the wide range of Vita shades available. High Strength
- Even In Veneers
Fortress is a specially reinforced ceramic with twice the strength of
normal porcelains, approximating the strength of cast or pressed ceramics.
This increased strength is accomplished by initiating crystal formation
within the glass matrix of the ceramic powder during the manufacturing
process. Leucite crystals with a high thermal expansion coefficient are
embedded in a glass matrix with a low thermal expansion coefficient. Compressive
stresses at the interface between the leucites and the glass within the
porcelain are built up. When cooled after firing, these transform to actually
counteract against fracture and cracking. As no core is required, the
benefits of this increased strength can be experienced in thin layers,
making Fortress ideal for veneers. |