Which of the following characteristics is specific to circumpulpal dentin?

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Collagen fibers run perpendicular to the dentinoenamel junctionVon Korff fibers can be foundIt contains phosphophorynMineralization depends on matrix vesiclesNone of the above

Explanation

Circumpulpal dentin is distinguished by the presence of phosphophoryn, a unique non-collagenous protein. In contrast, collagen fibers oriented perpendicular to the dentinoenamel junction and Von Korff fibers are features of mantle dentin. Additionally, matrix vesicles are not required for the mineralization of circumpulpal dentin.