VDW RECIPROC - Usage Details for R25; Usage Details for R40 and R50

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8. When using an R25:
Electronic length determination of the working length.
When using a R40 or R50:
After preparation of 2/3 of the working length, the working length
should be rechecked with an apex locator.
9. Afterwards continue with step 3-6 until full working length has been
reached.
Further languages are available upon request.