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<p>Primary Failure of Eruption<br>Commander Mark R. Boone, DC, USN, Lieutenant Matthew B. Kriewaldt, DC, USN, Lieutenant Commander Harry R. Cole, DC, USN<br><br>Introduction<br>Primary Failure of Eruption (PFE) is a rare disorder in which the dentition do not adequately erupt into a typical occlusion. It may be divided into 2 variations: Type I and Type II. Type I features a distally slanting open bite from anterior to posterior. Type II offers a varied eruption pattern, in more than one quadrant, with greater eruption than Type I, but ultimately less second molar height than a normal occlusion.<br>Incisors, canines, and premolars may be involved to a reduced degree. Other variations may include a Class III occlusion and/or poor root malformations, including blunting and dilacerations. Missing dentition may also be a coincident finding. Permanent (more commonly reported) and primary teeth may be affected, ultimately failing to gain vertical function. Primary teeth that may be affected are noted as teeth erupting into an established, initial occlusion and then failing to erupt to the final growth level.
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<br>Subjects: Tooth Eruption; Tooth; Deciduous</div>
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U.S. Navy. Naval Postgraduate Dental School</div>
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