References

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Primary failure of eruption or mechanical failure of eruption?

From Volume 11, Issue 4, October 2018 | Pages 133-138

Authors

Geetanjali Sharma

BDS, MJDF RCS(Eng), MClinDent, MOrth RCS(Eng), FDS (Orth) RCS(Eng)

Consultant Orthodontist, Frimley Health NHS Foundation Trust, UK

Articles by Geetanjali Sharma

Abstract

Failure of eruption (FOE) of first and second permanent molars is rare, with an estimated prevalence of 0.01% in the case of the first permanent molar and 0.06% in the case of the second.1 When there is failure of eruption of a permanent molar, the following differential diagnoses should be considered in addition to tooth impaction: primary failure of eruption (PFE) (Type I/Type II) and mechanical failure of eruption (MFE) owing to ankylosis. Limited studies have proposed protocols for the management of failure of eruption (FOE) of permanent molars with no clear consensus or guidelines.

CPD/Clinical Relevance: Making an early distinction between MFE and PFE is important in the management of patients with failure of eruption of permanent molars since they dictate different treatment modalities. This paper reviews the clinical characteristics of FOE of permanent molars to aid the clinician in diagnosis and subsequent management of this rare and challenging condition.

Article

Primary failure of eruption (PFE) is an isolated condition causing a localized failure of tooth eruption with no other identifiable local or systemic involvement. It is rare, with an estimated incidence of 0.06% with a gender ratio of 2.25:1 (F:M).2 It has been described based upon the following clinical features:3

Frazier-Bowers et al described three different forms of PFE:4

Radiographically, full root development is seen and the tooth is normally orientated in the eruption path.5 There is no evidence of any obstruction, eg overlying bone/pathology associated with the teeth which have failed to erupt. There will be evidence of bone resorption supra-coronally, giving rise to the classical ‘chimney’-like appearance6 (Figure 1) over the lower first permanent molars only. This appearance suggests a normal resorption process and deficiency of eruptive force to move the tooth along the path of eruption. Figure 2 is another example of a patient with PFE affecting the upper left first and second permanent molar teeth.

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