What information should be included in a post-obturation periapical radiograph to assess quality?

• A. Length of obturation relative to apex, density and homogeneity of fill, presence of voids, and coronal seal
• B. Patient's age
• C. Color of gutta-percha
• D. Path length to cusp

Answer: (A)

In a post-obturation radiograph, you look for four key factors that reflect a good seal and long-term success. First, the length of the obturation relative to the apex is essential: the fill should terminate near the apex without over-extending beyond it or stopping too short, typically ending about 0–2 mm short of the radiographic apex. This helps ensure the entire canal is sealed while avoiding irritation from overfill. Second, density and homogeneity matter because a dense, uniform fill without radiolucent voids indicates a well-condensed material and sealer; voids can harbor bacteria and create pathways for leakage. Third, the presence of voids in the canal obturation should be avoided, as voids compromise the seal and canal fill. Fourth, the coronal seal is important because a good obturation can still fail if the coronal restoration leaks; the radiograph should suggest that the coronal portion provides a barrier to reinfection.

Age, the color of gutta-percha, or a vague reference to “path length” to a cusp don’t provide useful information about obturation quality on a radiograph, so they aren’t relevant criteria for assessing this radiograph.