Topics

Topic

design image
Central inferior incisor tooth

The central inferior incisor is the frontmost tooth in the mandibular dental arch, located at the midline of the lower jaw. It is single-rooted, with a thin, conical crown and a straight root, designed primarily for cutting and incising food. The tooth consists of enamel, dentin, pulp, and cementum, with the pulp containing neurovascular structures essential for tooth vitality. Its anatomical position and shape contribute to mandibular arch symmetry, occlusion, and articulation with the maxillary incisors, playing a critical role in mastication and speech.

Synonyms

  • Mandibular central incisor

  • Lower central incisor

  • Inferior midline incisor

Function

  • Incising and cutting food during mastication

  • Maintains mandibular arch alignment and occlusion

  • Contributes to aesthetic appearance and phonation

  • Houses pulp tissue responsible for tooth vitality and sensory innervation

MRI Appearance
T1-weighted images:

  • Enamel appears very low signal (hypointense) due to its dense mineral content

  • Dentin is slightly higher signal, intermediate between enamel and pulp

  • Pulp appears hyperintense, reflecting vascular and soft tissue content

  • Surrounding alveolar bone shows intermediate signal, while marrow fat is hyperintense, providing natural contrast

  • Pathologies like pulpitis or periapical lesions appear hyperintense on pulp and surrounding tissues

T2-weighted images:

  • Enamel remains signal void (hypointense)

  • Dentin appears intermediate signal, pulp is bright hyperintense

  • Useful for identifying edema, cystic changes, or inflammatory processes within the pulp or periapical area

  • Surrounding bone marrow is hyperintense, enhancing visualization of periapical pathology

STIR (Short Tau Inversion Recovery):

  • Suppresses fat in bone marrow and surrounding tissues, highlighting inflammatory or edematous changes

  • Normal pulp shows intermediate signal, while periapical abscesses or pulpitis appear bright

  • Excellent for detecting early dental or periapical pathology

CT Appearance

  • Enamel appears hyperdense, with dentin slightly less dense and pulp as soft tissue density

  • Alveolar bone surrounding the tooth is corticated and hyperdense, with trabecular patterns visible

  • Air of the oral cavity appears hypodense (black), providing natural contrast against the tooth

  • CT is ideal for evaluating fractures, caries, periapical lesions, and bony anatomy for endodontic or surgical planning

MRI images

Central inferior incisor tooth mri axial image -img-00000-00000