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What is the correct sequence of instruments for the chemical preparation of the root canal? K20, K25, K30, K35, K40 K40, K35, K30, K25, K20 K20, ...

What is the correct sequence of instruments for the chemical preparation of the root canal?


K20, K25, K30, K35, K40
K40, K35, K30, K25, K20
K20, K25, K30, K35, K40