Radiographs add each of the following to an assessment of periodontal disease EXCEPT one. Which one is the EXCEPTION?

a. Root morphology and lengths
b. The amount of supporting bone between the teeth
c. The length of a clinical crown
d. The presence of dilacerate roots

c. Radiographs can reveal information about root morphology and lengths and the presence of dilacerations; root shape and width, such as multirooted teeth with ample supporting bone in between the roots; or narrow, close, or fused roots, all of which can help determine the treatment and predict treatment outcomes.