Mesiodistal position in relation to the second molar - M and the mandibular ramus - R
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Relation to the second molar - M
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Crown directed at or above the equator of the second molar
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Crown directed below the equator to the coronal third of the second molar root
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Crown/roots directed to the middle third of the second molar root
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Crown/roots directed to the apical third of the second molar root
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Relation to the mandibular ramus - R
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Sufficient space in the dental arch
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Partially impacted in the ramus
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Completely impacted in the ramus
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Completely impacted in the ramus in distoangular or horizontal position
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Apicocoronal position in relation to the alveolar crest - A and the mandibular canal - C (IAN injury risk)
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Relation to the adjacent alveolar crest (from the uppermost point of the tooth) - A
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Tooth is completely erupted
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Partially impacted, but widest part of the crown (equator) is above the bone
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Partially impacted, but widest part of the crown (equator) is below the bone
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Completely encased in the bone
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Relation to the mandibular canal (from the lowermost point of the tooth) - C
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≥ 3 mm to the mandibular canal
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Contacting or penetrating the mandibular canal, wall of the mandibular canal may be identified
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Contacting or penetrating the mandibular canal, wall of the mandibular canal is unidentified
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Roots surrounding the mandibular canal
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Buccolingual position in relation to mandibular lingual and buccal walls - B (LN injury risk)
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Relation to mandibular lingual and buccal
walls - B
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Closer to buccal wall
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In the middle between lingual and buccal walls
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Closer to lingual wall
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Closer to lingual wall, when the tooth is partially impacted or completely encased in the bone (A2 or A3)
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Spatial position - S
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Spatial position - S
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Vertical (90°)
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Mesioangular ≤ 60°
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Distoangular ≥ 120°
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Horizontal (0°) or inverted (270°)
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