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Topic

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Root canal of upper canines tooth

The root canal of the upper (maxillary) canine is a single, long, conical canal located within the root of the maxillary canine tooth. It extends from the pulp chamber in the crown to the apical foramen at the root tip, transmitting the neurovascular supply to the tooth pulp. The canal is usually straight and narrow, but may occasionally present slight curvature, particularly toward the apex. Its walls are formed by dentin, and it is lined internally by the pulp tissue, which contains nerves, blood vessels, and connective tissue. Knowledge of its precise anatomy is critical for endodontic procedures, root canal therapy, and surgical interventions.

Synonyms

  • Maxillary canine root canal

  • Upper cuspid pulp canal

  • Canine tooth pulp canal

  • Single canal of maxillary canine

Function

  • Houses the dental pulp, which provides sensory innervation, nutrition, and reparative capacity for the tooth

  • Facilitates transmission of nerve signals, including pain and temperature

  • Maintains tooth vitality and defense mechanisms against infection

  • Serves as a conduit for endodontic treatment during root canal therapy

MRI Appearance
T1-weighted images:

  • The root canal appears as a linear, low-signal structure within the high-signal dentin of the tooth

  • The surrounding pulp tissue may show intermediate signal, distinguishable from the hypointense hard tissue

  • Pathological changes such as pulp necrosis or inflammation may appear as altered signal intensity, often hyperintense after contrast

T2-weighted images:

  • The root canal lumen shows high signal if fluid or inflamed pulp is present, while normal pulp appears intermediate

  • Useful for detecting pulpal edema, necrosis, or periapical inflammation

  • Dentin remains low signal, providing clear contrast with the canal content

STIR (Short Tau Inversion Recovery):

  • Suppresses surrounding fat in the alveolar process, highlighting edema or inflammatory changes in periapical tissues

  • Normal pulp is low-to-intermediate signal, while abscesses, pulpitis, or inflammatory changes appear hyperintense

CT Appearance

  • The root canal appears as a hypodense channel within the dense hyperdense dentin and enamel of the tooth

  • The apical foramen may be visualized as a small opening at the root tip

  • CT is particularly useful for assessing canal morphology, curvature, calcifications, periapical lesions, or fractures

  • Surrounding alveolar bone is clearly visualized, providing context for endodontic planning and surgical access

MRI images

Root canal of upper canines tooth mri sagittal image -img-00000-00000