• Changqun Ren, Ruifeng Liu, Lei Tian, Peng Chen, and Shuxia Zhou.
• Department of Oral and Maxillofacial Surgery, College of Stomatology, Fourth Military Medical University, Xi'an, PR China. rcq180@sina.com
• Ulus Travma Acil Cer. 2006 Jan 1; 12 (1): 9-16.

BackgroundIndirect injuries of adjacent tissues and organs usually accompany maxillofacial impact injuries. However, studies on indirect dental pulp injury are rare. This study was designed to determine the characteristics of indirect dental pulp injury caused by impact injury of mandible in dogs.MethodsEighteen dogs were divided equally into six groups with random allocation. Right mandible of each dog was impacted but teeth were not injured directly. Then, the animals were killed at appointed time points and ultrastructural changes in dental pulp of assigned teeth of each dog were investigated with transmission electron microscope.ResultsDental pulp of the fourth premolar of right mandible was injured very severely, but irreversible necrosis did not occur in the end. Dental pulp of the second premolar of right mandible was injured less severely and reversibly. Dental pulp of the second premolar of left mandible was injured mildly and temporarily.ConclusionIn the indirect injury of dental pulp caused by maxillofacial impact injury, the injured area is relatively extensive. The effect of the trauma decreases progressively and sharply as the distance to the impact site increases. Ultrastructural changes in the damaged nerves take place early.

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