Guidelines are provided for the selection of materials and the design of all-ceramic posterior bridges exhibiting lifetime longer than 20 years under severe wet and cyclic loading conditions.
The authors report on the subcritical crack growth behavior of three dental restoration systems (Empress 2/IPS Eris, TZP/Cercon S and Inceram-Zirconia/Vita VM7) under cyclic loading in water, in order to establish guidelines for the use and design of long-lifetime all-ceramic posterior bridges.
At the last follow-up the occurrence of anterior and posterior bone bridging as well as cage subsidence (≥2 mm) [ 20] were assessed.
Zirconia is currently used as a framework material for posterior all-ceramic bridges.
The glass-ceramic developed in this study could be a good candidate for dental restorative applications, especially for posterior three-unit bridges.
The superficial fibres originate on the anterior colliculus and cross two joints (tibiotalar and talocalcaneal), whereas the deep part, originating in the groove between and on the posterior colliculus, only bridges the tibiotalar joint.
In spite of its noticeable susceptibility to fatigue in water, the 3Y-TZP material was found to be particularly suitable for the preparation of posterior all-ceramic bridges due to its high initial mechanical strength.
a Perirenal space limited by the anterior and posterior renal fascias, with bridging septa (red arrow) and adipose tissue.
The dPTTL appears on magnetic resonance imaging (MRI) and in anatomical dissection as thickest and bridges the posterior colliculus and the medial tubercle of the talus.
The most commonly used tests are the Prone Instability Test (PIT), the Passive Lumbar Extension (PLE) test, the Aberrant Movements Pattern (AMP), the Posterior Shear Test (PST), the Prone Bridge Test (PBT), the Supine Bridge Test (SBT), and the Active Straight Leg Raise Test.
b DIC image shows that the anterior side (near the plate) is bridged and the posterior side (away from the plate) is spanned by both direct extension and fusion of bone-like trabeculae.
