Underfilling (short obturation with voids)
What it is
Obturation that is too short (commonly >2 mm from the radiographic apex) and/or non-homogeneous with voids/gaps, so the canal is not sealed three-dimensionally. Endodontic outcome literature commonly defines "adequate" radiographic obturation as well-compacted and within 0–2 mm of the radiographic apex; anything shorter is typically classified as underfilled/underextended.
Why it happens
• Wrong working length (too short) or WL not re-checked after coronal flaring • Blocked canal / ledge → can't reach WL, so obturation ends short • Inadequate apical shaping or gauging → master cone doesn't match apical size → poor tug-back and short seating • Poor cone fit verification (no WL cone-fit radiograph; no tactile "fit" confirmation) • Insufficient compaction/thermoplasticization technique → voids • Moisture control issues (inadequate drying/bleeding control) → sealer washout/voids
The full clinical mistake entry includes
- How to avoid it — the prevention protocol
- The clinical tip experienced clinicians use
- The documented reference behind the mistake
More clinical mistakes
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