Final answer:
For a discolored tooth with obliterated pulp chamber and root canal space, and a normal periodontal ligament space that is asymptomatic and non-responsive to vitality tests, no treatment is recommended unless clinical symptoms appear.
Step-by-step explanation:
The recommended treatment for a tooth with a discolored clinical crown, obliterated pulp chamber and root canal space, with a normal periodontal ligament space and no symptoms, but not responding to vitality testing is E. none of the above.
No treatment is indicated unless there are clinical signs of pathology. Discoloration and radiographically obliterated pulp spaces are signs of pulp canal calcification or pulp necrosis, which is a common response to trauma. Endodontic treatment is not immediately necessary if the tooth is asymptomatic and the periodontal ligament space is normal, which suggests that there is no ongoing infection or inflammation.