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Impacted / delayed / malpositioned / extra teeth
Region of interest
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Volume rendering of 4th quadrant
MP4 Video: Suitable for Apple, Windows and mobile devices, 4th quadrant
1. Supernumerary tooth fused to tooth 46D
A supernumerary tooth is fused to the distal surface of tooth 46. The root canal systems of the supernumerary tooth in tooth 46 are continuous, and communicate at the levels of the coronal thirds of the roots, as shown in the mesiodistal cross sectional image. Therefore, tooth 46 would likely require endodontic treatment upon removal of the supernumerary tooth. The supernumerary tooth has prevented the eruption of tooth 47, but has not caused any resorption or damage to tooth 47.
Supernumerary tooth (s) fused to tooth 46D
A supernumerary tooth (s) is fused to the distobuccal aspect of the coronal two thirds of the distal root of tooth 46. The presence of the supernumerary tooth (s) has caused the vertical impaction of tooth 47. No resorption is present on the adjacent permanent teeth. The root of the supernumerary tooth (s) is fully formed. No signs of ankylosis are present. The inferior alveolar nerve canal passes lingual and inferior to the root apex of the supernumerary tooth (s).
Axial views of supernumerary tooth (s) and tooth 46
These axial cross-sectional tooth demonstrate the fusion of the supernumerary tooth to the distal surface of tooth 46, as well as the continuity of the root canal systems of the two teeth.
Impacted tooth 47
Tooth 47 is vertically impacted due to the proximity to the supernumerary tooth (s) on the mesial aspect of the tooth. The right mandibular nerve canal passes apical to the apical notches of the mesial and distal roots of 47, and is mildly compressed in this region. No resorption is present on tooth 47.
Normal tooth 45
Tooth 45 has not been affected by the fused supernumerary tooth (s) to tooth 46. No resorption is evident at tooth 45.
Axial views of mid 4th quadrant
These axial cross-sectional images demonstrate the fused supernumerary tooth (s) to the distal root of tooth 46. No resorption is present on the adjacent permanent teeth. Tooth 47 has been impacted.