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Traumatic dental injuries are a common presentation to the Emergency Department. They can have significant cosmetic, functional, and psychological consequences for the patient. Studies estimate the incidence of Emergency Department visits for dentoalveolar trauma to be as high as 10 percent.1 Approximately 50 percent of children will sustain traumatic dental injuries, the majority of these to the permanent teeth.1–4

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The appropriate Emergency Department management of dental trauma depends heavily upon the type of tooth (permanent versus primary), the age of the tooth, the time elapsed since the incident, and the extent of the damage. Successful treatment of dental injuries requires a basic understanding of dental anatomy, terminology, and pathophysiology. Violence of a suspicious nature must always be considered when evaluating dental injuries. The goals of the emergent treatment of dental trauma are to maintain patient comfort and tooth vitality, while ensuring prompt dental follow-up for definitive care.

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Tooth Anatomy

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There are significant differences in the adult and pediatric dentitions that impact their treatment in the Emergency Department (Figure 159-1). The pediatric dentition is known as the primary or deciduous dentition and consists of 20 teeth. These include 8 incisors, 4 canines, and 8 molars. The adult dentition consists of 32 teeth and is composed of 8 incisors, 4 canines, 8 premolars, and 12 molars. The variable absence of a tooth or the addition of an extra tooth is common in either dentition. The teeth in both the pediatric and adult dentitions erupt in a predictable sequence, albeit with considerable individual variation (Figure 159-1). Treatment strategies differ for permanent versus deciduous (primary) teeth as well as by the age of the adult tooth. Exercise great care when evaluating patients with a “mixed” dentition, roughly between the ages of 6 and 12 years.

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Figure 159-1
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The normal eruptive patterns of the pediatric and adult dentition.

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The anatomy of a tooth is rather simple (Figure 159-2). The tooth itself consists of a neurovascular pulp surrounded by supportive dentin, which is surrounded by a hard thick crown of enamel. The crown portion lies above the gum line or gingiva. The root portion lies embedded within the alveolar bone of the jaw, anchored by a thin layer of cementum and the periodontal ligament. The alveolar bone, periodontal ligament fibers, and fragile cementum cell layer taken together are considered a functional unit known as the attachment apparatus. A complete attachment apparatus requires an intact cementum cellular layer and a fully formed root apex. Immature adult teeth do not have a fully formed apex and necessitate special attention to maintain pulpal viability.2,4,5

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Figure 159-2
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The dental anatomic unit (i.e., the tooth) and its supporting structures.

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