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What is According to Schilder, mechanical objective of cleaning and shaping is/are: and explain in detail?
Schilder’s Mechanical Objectives of Cleaning and Shaping:

The root canal preparation should develop a continuously tapering cone.
Making the preparation in multiple planes which introduces the concept of “flow”.
Making the canal narrower apically and widest coronally.
Avoid transportation of the foramen.
Keep the apical opening as small as possible.