The type of response to the percussion or palpation test would indicate that the inflammation is present in the periodontal ligament and that endodontic treatment is most likely to indicate whether there is inflammation in the periapical tissues.
A periodontal ligament is the connective tissue that surrounds the tooth (specifically covering the cementum) and connects the tooth to the jawbone, holding it in place.
Thus, this could be the answer.
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