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Dental pulp of upper molar tooth

The dental pulp is the soft connective tissue core of the upper molar tooth, enclosed within the pulp chamber and root canals of the tooth. It contains blood vessels, nerves, lymphatics, and specialized odontoblasts, which are essential for tooth vitality and dentin formation. In upper molars, the pulp is multirooted, with a central pulp chamber in the crown and multiple root canals extending into each root. Its morphology varies with tooth type (first, second, or third molars) and age, and it is influenced by secondary dentin deposition and pathological processes such as caries or pulpitis.

Synonyms

  • Maxillary molar pulp

  • Tooth pulp chamber of upper molar

  • Endodontic pulp of upper molar

Function

  • Maintains tooth vitality by providing blood supply and innervation

  • Supports dentin formation via odontoblasts lining the pulp chamber

  • Transmits pain, temperature, and pressure sensations from the tooth

  • Participates in defense against bacterial invasion and injury

MRI Appearance
T1-weighted images:

  • The pulp appears as a low- to intermediate-signal intensity structure within the hyperintense dentin and surrounding fat of the alveolar bone

  • Nerve and vascular components are not separately visualized

  • Pathological changes such as pulpitis or necrosis may alter signal, showing hyperintensity with edema or enhancement after contrast

T2-weighted images:

  • Pulp is slightly hyperintense relative to dentin, while surrounding enamel and dentin remain low signal

  • Edema or inflammation within the pulp appears markedly hyperintense, useful for diagnosing pulpitis

STIR (Short Tau Inversion Recovery):

  • Suppresses surrounding fat signal, highlighting pulp pathology

  • Normal pulp appears low- to intermediate-signal, while inflammatory or necrotic changes appear bright hyperintense

CT Appearance

  • On cone-beam or conventional CT, the pulp appears as a hypodense (low-density) central cavity within the hyperdense dentin and enamel

  • Root canals of the upper molar are clearly visible, showing the multirooted configuration

  • CT is ideal for evaluating pulp chamber anatomy, accessory canals, calcifications, caries, and periapical pathology

MRI images

Dental pulp of upper molar tooth mri sagittal image -img-00000-00000