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Causes of Pulpal Necrosis

# Which of the following types of trauma is LEAST likely to result in pulpal necrosis?
A. Lateral luxation
B. Avulsion
C. Subluxation
D. Concussion
E. Extrusion 


The correct answer is D. Concussion. 

Concussion - An injury to the tooth supporting structures without increased
mobility or displacement of the tooth, but
can present with pain to percussion.

Pulpal necrosis can occur following a
serious tooth trauma, especially if the the
apical blood vessels are severed.

Subluxation- An injury to the tooth supporting structures resulting in increased
mobility, but without displacement of the
tooth. Bleeding from the gingival sulcus confirms the diagnosis.

Extrusion- The partial displacement of the
tooth out of its socket.

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