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    Ruby Wilson

    When transitioning from a manual glide path to rotary files in a highly calcified mesial canal of a mandibular molar, what is the safest speed/torque setting and file sequence to prevent file cyclic fatigue and separation?

    Best protocol to avoid file separation in calcified canals?
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    Purvi Awasthi

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    Recommended Protocol for Calcified Mesial Canals

    Navigating calcified, curved mesial canals of mandibular molars requires minimizing both torsional stress and cyclic fatigue. Here is a safe, evidence-based sequence and motor setting guide:

    1. Orifice Modification & Coronal Flaring

    • Goal: Remove coronal overhangs and create straight-line access to lessen file stress downstream.

    • File: Dedicated Orifice Opener (e.g., SX file or short heat-treated opener).

    • Settings: ~300 RPM | 2.0–2.5 N·cm torque.

    • Technique: Brush away from the furcation (outer wall) before penetrating deeper into the canal.

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    Mariya Williams

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    say on

    Recommended Protocol for Calcified Mesial Canals

    Navigating calcified, curved mesial canals of mandibular molars requires minimizing both torsional stress and cyclic fatigue. Here is a safe, evidence-based sequence and motor setting guide:

    1. Orifice Modification & Coronal Flaring

    • Goal: Remove coronal overhangs and create straight-line access to lessen file stress downstream.

    • File: Dedicated Orifice Opener (e.g., SX file or short heat-treated

    ⋮
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