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To compare the ability of three methods of preparing root canals to provide a properly shaped canal, silicone models were used. The canals of extracted teeth were prepared and filled with a silicone impression material. The teeth were dissolved, and the remaining models were studied and photographed. The hand instrument group and the SET angle were equal. The subsonic instrument did not shape a canal as well as the other two.
A singular matrix A may have more than one LU factorizations. In this work the set of all LU factorizations of A is explicitly described when the lower triangular matrix L is nonsingular. To this purpose, a canonical form of A under left multiplication by unit lower triangular matrices is introduced. This canonical form allows us to characterize the matrices that have an LU factorization and to parametrize all possible LU factorizations. Formulae in terms of quotient of minors of A are presented for the entries of this canonical form.
If instead of removing only vertices from a graph, one removes entire closed neighbourhoods of vertices, one arrives at a generalization of the concept of connectivity. A graph G is said to be Nike Roshe Run Women k-n-connected if the removal of any set of fewer than k closed neighbourhoods neither disconnects the graph, nor leaves only a single surviving clique. This paper give a complete characterization of all minimal k-n-connected graphs that are k-regular and Nike Free Run Trainers Uk that contain a k-clique.