Which of the following are considered regressive changes in the dental pulp?

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Enhanced fibrous tissue presenceReduction in the number of cellsCalcification occurring in vessels near the apical foramenAll of the above

Explanation

Regressive alterations in the pulp include an increase in fibrous tissue, a decline in cellular content, and calcification within blood vessels close to the apical foramen. Therefore, all these changes collectively represent regressive pulp changes.