Imaging Sci Dent.  2018 Sep;48(3):185-190. 10.5624/isd.2018.48.3.185.

Location and shape of the mandibular lingula: Comparison of skeletal class I and class III patients using panoramic radiography and cone-beam computed tomography

• Jung YH
• Cho BH
• Hwang JJ

• KMID: 2420546
• DOI: http://doi.org/10.5624/isd.2018.48.3.185

Abstract

PURPOSE
The aim of this study was to compare the location and the shape of the mandibular lingula in skeletal class I and III patients using panoramic radiography and cone-beam computed tomography.
MATERIALS AND METHODS
The sample group included 190 skeletal class I patients and 157 class III patients. The location of the lingula in relation to the deepest point of the coronoid notch was classified into 3 types using panoramic radiographs. The shapes of the lingulae were classified into nodular, triangular, truncated, or assimilated types using cone-beam computed tomographic images. The data were analyzed using the chi-square test.
RESULTS
The tips of the lingulae were at the same level as the coronoid notch in 75.3% of skeletal class I patients and above the coronoid notch in 66.6% of class III patients. The positions of the lingulae in relation to the deepest point of the coronoid notch showed statistically significant differences between class I and class III patients. The most common shape was nodular, and the least common was the assimilated shape. Although this trend was not statistically significant, the triangular shape was more frequently observed in class III patients than in class I patients.
CONCLUSION
The locations and the shapes of the mandibular lingulae were variable. Most of the lingulae were at the same level as the coronoid notch in skeletal class I patients and above the coronoid notch in skeletal class III patients. The nodular and assimilated-shaped lingulae were the most and the least prevalent, respectively.

Keyword

Mandible; Alveolar Nerve, Inferior; Radiography, Panoramic; Cone-Beam Computed Tomography

MeSH Terms

Cone-Beam Computed Tomography*
Humans
Mandible
Mandibular Nerve
Radiography, Panoramic*

Figure

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  Fig. 1 The locations of the tips of mandibular lingulae relative to the deepest point of the coronoid notch are classified into 3 types, as shown on panoramic radiography. Black arrow, the tip of the lingula; white arrow, the deepest point of the coronoid notch. A. Type I: the tip of the lingula is above the deepest point of the coronoid notch. B. Type II: the tip of the lingula is at the same level as the deepest point of the coronoid notch. C. Type III: the tip of the lingula is below the deepest point of the coronoid notch.

• 

  Fig. 2 The shapes of the lingulae are classified into 4 types on CBCT images: triangular, truncated, nodular, and assimilated. A. The triangular lingula has a wide base and a narrow rounded or pointed apex. B. The truncated lingula has a quadrangular top. C. The nodular lingula is of nodular shape and of variable size, and almost the entire lingula of this type, except for its apex, merges into the ramus. D. The assimilated lingula is completely incorporated into the ramus.

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