Irregular opaque areas are found on radiographs of lower anterior teeth, the teeth are vital. The cause may be:

 # Irregular opaque areas are found on radiographs of lower anterior teeth, the teeth are vital. The cause may be: 

A. Subgingival calculus 

B. Cementoma

C. Condensing osteitis 

D Chronic apical periodontitis 

The correct answer is A. Subgingival calculus.

Calculus may be seen as small angular radiopaque deposits projecting between interproximal surfaces of the teeth or as radiopaque bands across the roots representing circumferential accumulation as illustrated in the figure.

Ref: White, S.C. and Pharoah, M.J., 2014. Oral radiology-E-Book: Principles and interpretation. Elsevier Health Sciences.