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13-point curved canal checklist

Use the checklist when the canal stops behaving like a straight line.

Tap a point to bring the clinical guidance into focus. On larger screens, hover works too. The copy is written for controlled diagnosis, glide path confirmation, shaping, and stop decisions.

Diagnose and orient
01

Assume the canal is more curved than the root looks

Root form underestimates canal complexity, especially in mesial roots and apical hooks.

Treat a straight-looking root as incomplete information. The Root Canal Anatomy in Permanent Dentition notes that nearly all canals curve in the apical third, often in a buccolingual direction that standard radiographs can hide. Mesial roots and apical hooks can turn after the coronal and middle thirds appear manageable. Start with the expectation that the file will meet a curve, and make the clinical aim preservation of the original path, not straightening the canal into the shape the instrument prefers.

Related YouTube How to Get Down Super Curved Root Canals

Source base

The curved-canal checklist combines the local EndoTech source folder with anatomy, curvature, cyclic-fatigue, shaping, apical-enlargement, isthmus, and irrigation literature. The page uses these sources to support small-file scouting, reproducible glide path control, short rotary engagement, recapitulation, and early stop-or-refer decisions.

Download PDF 13-point curved-canal checklist
  • Versiani MA, Basrani B, Sousa-Neto MD, editors. The Root Canal Anatomy in Permanent Dentition. Springer; 2019. doi:10.1007/978-3-319-73444-6.
  • Carrotte P. Endodontics: Part 4, Morphology of the root canal system. British Dental Journal. 2004;197(7):379-383. doi:10.1038/sj.bdj.4811711.
  • Schneider SW. A comparison of canal preparations in straight and curved root canals. Oral Surgery, Oral Medicine, Oral Pathology. 1971;32(2):271-275. doi:10.1016/0030-4220(71)90230-1.
  • Pruett JP, Clement DJ, Carnes DL Jr. Cyclic fatigue testing of nickel-titanium endodontic instruments. Journal of Endodontics. 1997;23(2):77-85. doi:10.1016/S0099-2399(97)80250-6.
  • Peters OA. Current challenges and concepts in the preparation of root canal systems: a review. Journal of Endodontics. 2004;30(8):559-567. doi:10.1097/01.don.0000129039.59003.9d.
  • ElAyouti A et al. Increased apical enlargement contributes to excessive dentin removal in curved root canals: a stepwise microcomputed tomography study. Journal of Endodontics. 2011;37(11):1580-1584. doi:10.1016/j.joen.2011.08.019.
  • Endal U et al. A high-resolution computed tomographic study of changes in root canal isthmus area by instrumentation and root filling. Journal of Endodontics. 2011;37(2):223-227. doi:10.1016/j.joen.2010.10.012.
  • Adcock JM et al. Histologic evaluation of canal and isthmus debridement efficacies of two different irrigant delivery techniques in a closed system. Journal of Endodontics. 2011;37(4):544-548. doi:10.1016/j.joen.2011.01.006.
  • Curved Canals transcript and clinical summary set, EndoTech NZ source folder.