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Dental Intrusion: Causes, Symptoms & Treatment

Dental intrusion is a type of tooth injury where a tooth is forcefully driven into the jawbone following trauma. It most commonly affects primary teeth in young children.

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Things worth knowing about "Intrusion"

Dental intrusion is a type of tooth injury where a tooth is forcefully driven into the jawbone following trauma. It most commonly affects primary teeth in young children.

What is Dental Intrusion?

Dental intrusion is one of the most severe forms of tooth trauma, in which a tooth is displaced apically (pushed deeper) into the alveolar bone and surrounding soft tissues due to an axial impact force. The tooth may appear shortened or nearly invisible within the gum. It is classified as a luxation injury and requires prompt dental assessment.

Causes

Intrusion results from a direct axial force applied along the long axis of the tooth. Common causes include:

Falls, particularly in toddlers and school-age children
Sports-related injuries (e.g., impact from a ball or collision with another player)
Motor vehicle accidents
Direct blows to the jaw or face

Primary (baby) teeth in the front of the mouth are most frequently affected, as children aged 1 to 3 years are particularly prone to falls.

Symptoms

A dental intrusion is often visible immediately following the injury. Key signs include:

The affected tooth appears shorter than usual or is barely visible
Pain and tenderness in the affected area
Swelling and bleeding of the gum tissue
Discomfort or difficulty biting
In children: crying and distress following a fall

Diagnosis

Diagnosis is made by a dentist or oral surgeon and typically involves:

Clinical examination: Assessment of tooth position and surrounding soft tissues
Dental X-rays (radiographs): To determine the depth of intrusion, assess potential bone damage, and evaluate root development in permanent teeth
Sensibility (vitality) testing: To determine whether the dental pulp (the inner tissue of the tooth) is still alive

In children with primary teeth, the relationship between the intruded tooth and the underlying permanent tooth germ must also be evaluated to prevent long-term damage.

Treatment

Treatment depends on the severity of the injury, the patient's age, and whether the affected tooth is a primary or permanent tooth.

Intrusion of Primary Teeth

In many cases involving primary teeth, a watchful waiting approach is preferred. The intruded tooth may re-erupt spontaneously within a few weeks to months. If there is a risk of damage to the underlying permanent tooth, extraction of the primary tooth may be necessary.

Intrusion of Permanent Teeth

Permanent teeth often require active intervention:

Spontaneous re-eruption: In mild cases, particularly when root development is incomplete, the tooth may move back into position on its own under careful monitoring.
Orthodontic extrusion: Braces or special orthodontic devices are used to gradually reposition the tooth.
Surgical repositioning: In severe cases, the tooth is manually repositioned under local anesthesia and then splinted.
Root canal treatment (endodontic therapy): Because the blood vessels and nerves supplying the tooth are often damaged during intrusion, root canal treatment is frequently needed to preserve the tooth.

Complications

Without timely treatment, the following complications may arise:

Pulp necrosis: Death of the dental pulp tissue
Root resorption: The bone gradually breaks down the tooth root
Ankylosis: Fusion of the tooth to the surrounding bone, which may complicate future orthodontic treatment
Damage to permanent teeth in cases where primary teeth are intruded in young children

Prognosis

The prognosis for an intruded tooth depends on the severity of the injury and how quickly professional dental care is sought. Early treatment significantly improves the chances of long-term tooth survival. Regular follow-up appointments with a dentist are essential after a dental intrusion to monitor healing and detect complications early.

References

Flores MT et al. - Guidelines for the management of traumatic dental injuries: 2. Avulsion of permanent teeth. Dental Traumatology, 2007; 23(3): 130-136.
Andersson L et al. - International Association of Dental Traumatology guidelines for the management of traumatic dental injuries: 1. Fractures and luxations. Dental Traumatology, 2012; 28(1): 2-12.
DiAngelis AJ et al. - International Association of Dental Traumatology guidelines for the management of traumatic dental injuries: 1. Fractures and luxations of permanent teeth. Dental Traumatology, 2012; 28(1): 2-12.

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