Pulp canal obliteration as a trauma sequela is characterized by

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Trauma can stimulate the pulp to lay down mineralized tissue, gradually filling and narrowing the pulp chamber and root canal until it becomes obliterated. This calcific metamorphosis is what defines pulp canal obliteration: the canal space is calcified, often while the tooth remains vital. Radiographs typically show a narrowing or disappearance of the canal space, even though the tooth may still respond to vitality tests. Clinically, the tooth may be asymptomatic, and endodontic treatment is usually not indicated unless pulp necrosis or infection develops later, which would then make access to the canal more difficult due to the calcified walls. The other possibilities don’t fit because they describe conditions of necrosis, hyperemia, or increased vitality, which are not characteristic of the calcific obliteration seen after trauma.