Now this post will be fairly short as root caries are more commonly seen intraorally then on radiographs. Larger lesions with loss of tooth structure will be evident on radiographs.
One thing to be aware of when evaluating for root caries is cervical burnout. Cervical burnout presents as a diffuse radiolucent area on the interproximal surfaces of the root apical to the cemento-enamel junction. This is created by decreased x ray attenuation of the cementum as it is very thin and unable to stop x rays from reaching the image receptor.
Note the yellow arrows pointing to diffuse radiolucent areas on the interproximal surfaces of the tooth. There is no loss of tooth structure and this radiolucent area extends apically to the bone indicating cervical burnout.
Practice examples coming later today. If you have any questions or comments, please leave them below. Thanks and enjoy!