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Accessory mental foramen: A rare anatomical variation detected by cone-beam computed tomography.

Torres MG, Valverde Lde F, Vidal MT, CrusoƩ-Rebello IM - Imaging Sci Dent (2015)

Bottom Line: The mental foramen is a bilateral opening in the vestibular portion of the mandible through which nerve endings, such as the mental nerve, emerge.In general, the mental foramen is located between the lower premolars.In the hemimandible, the mental foramen normally appears as a single structure, but there are some rare reports on the presence and number of anatomical variations; these variations may include accessory foramina.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral Radiology, School of Dentistry, Federal University of Bahia, Salvador, BA, Brazil.

ABSTRACT
The mental foramen is a bilateral opening in the vestibular portion of the mandible through which nerve endings, such as the mental nerve, emerge. In general, the mental foramen is located between the lower premolars. This region is a common area for the placement of dental implants. It is very important to identify anatomical variations in presurgical imaging exams since damage to neurovascular bundles may have a direct influence on treatment success. In the hemimandible, the mental foramen normally appears as a single structure, but there are some rare reports on the presence and number of anatomical variations; these variations may include accessory foramina. The present report describes the presence of accessory mental foramina in the right mandible, as detected by cone-beam computed tomography before dental implant placement.

No MeSH data available.


Related in: MedlinePlus

Sequential parasagittal sections obtained every 1 mm in the distomesial direction on the right side of the mandible show the presence of two openings of the mandibular canal in the vestibular direction (two mental foramina) (arrows).
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Figure 2: Sequential parasagittal sections obtained every 1 mm in the distomesial direction on the right side of the mandible show the presence of two openings of the mandibular canal in the vestibular direction (two mental foramina) (arrows).

Mentions: Sequential axial sections in the craniocaudal direction (Fig. 1), sequential parasagittal sections obtained every 1 mm in the distomesial direction (Fig. 2), and coronal sections in the posteroanterior direction (Fig. 3) revealed the presence of two mental foramina on the right side of the mandible, while only one foramen could be identified on the left side. At the level of the second premolar, before its opening in the vestibular portion of the mandible, the mandibular canal on the right side showed a ramification with a distinct and independent intraosseous course in the posterior direction and an additional opening in the vestibular cortical bone of the mandible. The mental foramen and accessory mental foramen, measuring 2.83 and 1.75 mm in diameter, respectively, were present at the same height, with the accessory mental foramen in a slightly posterior position. The mental foramen on the left side was a single structure located at the same height as the others, but with a diameter of 4.84 mm.


Accessory mental foramen: A rare anatomical variation detected by cone-beam computed tomography.

Torres MG, Valverde Lde F, Vidal MT, CrusoƩ-Rebello IM - Imaging Sci Dent (2015)

Sequential parasagittal sections obtained every 1 mm in the distomesial direction on the right side of the mandible show the presence of two openings of the mandibular canal in the vestibular direction (two mental foramina) (arrows).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4362993&req=5

Figure 2: Sequential parasagittal sections obtained every 1 mm in the distomesial direction on the right side of the mandible show the presence of two openings of the mandibular canal in the vestibular direction (two mental foramina) (arrows).
Mentions: Sequential axial sections in the craniocaudal direction (Fig. 1), sequential parasagittal sections obtained every 1 mm in the distomesial direction (Fig. 2), and coronal sections in the posteroanterior direction (Fig. 3) revealed the presence of two mental foramina on the right side of the mandible, while only one foramen could be identified on the left side. At the level of the second premolar, before its opening in the vestibular portion of the mandible, the mandibular canal on the right side showed a ramification with a distinct and independent intraosseous course in the posterior direction and an additional opening in the vestibular cortical bone of the mandible. The mental foramen and accessory mental foramen, measuring 2.83 and 1.75 mm in diameter, respectively, were present at the same height, with the accessory mental foramen in a slightly posterior position. The mental foramen on the left side was a single structure located at the same height as the others, but with a diameter of 4.84 mm.

Bottom Line: The mental foramen is a bilateral opening in the vestibular portion of the mandible through which nerve endings, such as the mental nerve, emerge.In general, the mental foramen is located between the lower premolars.In the hemimandible, the mental foramen normally appears as a single structure, but there are some rare reports on the presence and number of anatomical variations; these variations may include accessory foramina.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral Radiology, School of Dentistry, Federal University of Bahia, Salvador, BA, Brazil.

ABSTRACT
The mental foramen is a bilateral opening in the vestibular portion of the mandible through which nerve endings, such as the mental nerve, emerge. In general, the mental foramen is located between the lower premolars. This region is a common area for the placement of dental implants. It is very important to identify anatomical variations in presurgical imaging exams since damage to neurovascular bundles may have a direct influence on treatment success. In the hemimandible, the mental foramen normally appears as a single structure, but there are some rare reports on the presence and number of anatomical variations; these variations may include accessory foramina. The present report describes the presence of accessory mental foramina in the right mandible, as detected by cone-beam computed tomography before dental implant placement.

No MeSH data available.


Related in: MedlinePlus