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Anatomical deviations preventing access or preparation of canal, including root-canal calcification, pulp stones, severely curved roots, bifurcations, secondary roots, lateral canals, delta apexes, internal and external resorption resistant to conventional treatment and an incomplete apex, may prevent the complete cleaning and preparation of ...
In dental anatomy, the apical foramen, literally translated "small opening of the apex," is the tooth's natural opening, found at the root's very tip—that is, the root's apex—whereby an artery, vein, and nerve enter the tooth and commingle with the tooth's internal soft tissue, called pulp. Additionally, the apical foramen is the point ...
Tetradentate ligand. In chemistry, tetradentate ligands are ligands that bind four donor atoms to a central atom to form a coordination complex. This number of donor atoms that bind is called denticity and is a method of classifying ligands. Tetradentate ligands are common in nature in the form of chlorophyll, which has a core ligand called ...
Applied Physics Express. Applied Physics Express or APEX is a scientific journal publishing letters, with usually no more than three pages per (concise) article. The main purpose is to rapidly publish original, timely, and novel research papers in applied physics. As part of its aim, the journal intends for papers to be novel research that has ...
Delta IV Heavy: D-389 Cape Canaveral SLC-37B: ULA: Orion 12 / Mentor 10 : NRO: Geosynchronous: Reconnaissance : In orbit: Operational NROL-70 Mission. Final Delta IV Heavy launch, and final launch of the Delta rocket family. 10 April 05:40:00: Falcon 9 Block 5: Starlink Group 6-48 Cape Canaveral SLC-40: SpaceX: Starlink × 23 SpaceX: Low Earth
General Dynamics F-16XL. The General Dynamics F-16XL is a derivative of the F-16 Fighting Falcon with a cranked-arrow delta wing. It entered the United States Air Force 's (USAF) Enhanced Tactical Fighter (ETF) competition in 1981 but lost to the F-15E Strike Eagle.
The Laplace pressure is the pressure difference between the inside and the outside of a curved surface that forms the boundary between two fluid regions. [1] The pressure difference is caused by the surface tension of the interface between liquid and gas, or between two immiscible liquids. The Laplace pressure is determined from the Young ...
The ancient North Siberians were once a people whose ancestors archaeological remains have been found at the Paleolithic Yana RHS (Rhinoceros Horn Site) on the Yana River delta in arctic northern Siberia that is dated 31,600 YBP, and at the Mal'ta site near Lake Baikal in southern Siberia just north of Mongolia that is dated 24,000 YBP. Ancient ...