Intrusion of a permanent incisor
Intrusive luxation (intrusion) is the displacement of the tooth into the alveolar bone along the axis of the tooth and is accompanied by comminution or fracture of the alveolar socket.
According to the degree of clinical displacement, intruded teeth may be classified into 3 categories: mild intrusion (< 3 mm), moderate intrusion (3–6 mm) and severe intrusion (> 6 mm).
a. Most common in children between age 6 and 12.
b. More common in boys than girls.
c. Intrusion of a permanent incisor is a rare injury. However, the following are the most common intrusion injury patterns.
c.1 Intrusion without additional injury, intrusion without crown fracture, intrusion without crown–root fracture or root fracture.
c.2 Intrusion of one or more teeth.
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Axial displacement into the alveolar bone. Sometimes the tooth may not be clinically visible.
The tooth is nonmobile.
Percussion may give a high, metallic, ankylotic sound.
Sensitivity test usually gives negative result.
Pain is not usually associated with intrusion of a permanent tooth.
° Akanksha Srivastava, BDS, MSc / Nidhi Gupta, BDS, MDS / Annie Marleau, DMD / Kelvin I. Afrashtehfar, DDS, FADI