Which finding does NOT indicate the presence of multiple canals in a maxillary second premolar?

In the context of determining the presence of multiple canals in a maxillary second premolar, the presence of a canal that is well centered in the root suggests a more typical anatomical configuration, where a single canal is often found. This is because single canals generally exhibit a centered position within the root structure.

In contrast, a sharp change in canal density, unclear root outline, or unusual root contour can all suggest complexities associated with additional canals. For instance, variations in density might indicate areas where multiple canals diverge or converge, suggesting anatomical intricacies. Similarly, an unclear root outline could imply that the root has atypical morphologies associated with multiple canals. Unusual root contour is another indicator that there may be more than one canal, as irregular shapes are often associated with variations in canal systems.

Thus, a canal that is well centered indicates a more conventional configuration typical of a single canal, whereas the other findings suggest the possibility of multiple canals due to their implications of anatomical irregularities or variations.