Final answer:
The statement is false; enlarged pulp chambers would be more discernible on a radiograph, not less. The pulp chamber and root canal can decrease in size due to secondary dentin, not enlarge.
Step-by-step explanation:
The statement 'Radiographically, the pulp chambers in teeth #8 and #9 are barely discernible because the pulp chambers have substantially enlarged in size' is false. When a pulp chamber enlarges, it actually becomes easier to see on a radiograph. The structure of a tooth consists of an outer layer of enamel, a layer of dentin, and an innermost pulp cavity, which includes the pulp chamber and root canal.
Over time, the pulp chamber and canals can decrease in size due to deposits of secondary dentin, not enlarge. An enlargement of the pulp chamber could suggest a different pathological condition. X-ray images can reveal changes in tooth structure, such as fillings, decay, and the size of the pulp chambers and canals.