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VOLUME 10 , ISSUE 1 ( January, 2009 ) > List of Articles


Lingual Eruption of Mandibular Permanent Incisors: A Space Correlated Phenomenon?

Naser Asl Aminabadi, Ramin Mostofi Zadeh Farahani, Aydin Sohrabi, Firuz Pouralibaba

Citation Information : Aminabadi NA, Farahani RM, Sohrabi A, Pouralibaba F. Lingual Eruption of Mandibular Permanent Incisors: A Space Correlated Phenomenon?. J Contemp Dent Pract 2009; 10 (1):25-32.

DOI: 10.5005/jcdp-10-1-25

License: CC BY-NC 3.0

Published Online: 01-12-2010

Copyright Statement:  Copyright © 2009; The Author(s).



The aim of the present study was to investigate the prevalence and distribution according to various arch length conditions of lingually erupted mandibular permanent incisors and the effect of space condition on this phenomenon with long-term follow-up of these teeth.

Methods and Materials

A total of 105 children aged 5-7.5 years with one or more permanent mandibular incisors erupting lingual to the corresponding primary incisors were included in the study. A space analysis was performed. The subjects were divided into six groups according to various space conditions. The subjects were followed for 2 years.


In this study the prevalence of lingual eruption was 18.4%. Eighty-three point seven percent of the subjects had either equivalent space, mild space excess, or a space deficiency (not more than 3 mm). No relationship was found between groups and clinical outcomes (P>.05). Follow up of the main three groups (according to the space analysis results) revealed in the adequate space group 75% of the children lost their primary incisors without any intervention. Similar outcomes occurred in 85.7% and 57.14% of cases in the mild space excess and space deficiency groups, respectively. Considering the three main groups combined, equivalent space, mild space excess, and mild space deficiency, 70.45% of children lost their primary incisors without any intervention and 14.8% needed primary incisor extraction (17.4%, 14.3%, and 10.7% in each group, respectively).


There was no predisposition toward a space deficiency or excess found in these subjects so the wait-and-see policy versus early extraction can be considered for lingually erupting permanent mandibular incisors.

Clinical Significance

Lingual eruption of mandibular incisors is a common clinical problem in the early mixed dentition period that is a source of discomfort for parents of patients with this condition. The present study provides a unique insight into the prevalence of the problem as well as the clinical decisions such as favoring retention of primary incisors as long as possible, the extraction of these primary teeth, placement of lower lingual holding arches, or referral for comprehensive orthodontic treatment. These types of data should not be regarded as standards but as illustrative of several key factors that are still not well-understood or which are still ignored.


Aminabadi NA, Farahani RMZ, Sohrabi A, Pouralibaba F. Lingual Eruption of Mandibular Permanent Incisors: A Space Correlated Phenomenon? J Contemp Dent Pract 2009 January; (10)1:025-032.

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  1. Managing cases of overretention of mandibular primary incisors where their permanent successors erupt lingually. J Dent Children 1982:118-122.
  2. Dentistry for the child and adolescent. 8th ed. Mosby, 2005, pp.184-6.
  3. Effect of serial extraction alone on crowding: relationships between tooth width, arch length, and crowding. Am J Orthod Dentofacial Orthop. 1999;116:691–696.
  4. Available space for the incisors during dental development-a growth study based on physiologic age. Angle Orthod. 1965;35:12–22.
  5. Early stages of development. In: Contemporary orthodontics. 3rd ed. St. Louis: Mosby; 2000:86–91.
  6. The irregularity index: a quantitative score of mandibular anterior alignment. Am J Orthod. 1975;68:554–563.
  7. Maturation of untreated normal occlusions. Am J Orthod. 1983;83:114–123.
  8. Facial and dental changes in adulthood. Am J Orthod Dentofacial Orthop. 1994;106:175–186.
  9. The prediction of the size of unerupted canines and premolars in a contemporary orthodontic population. J Am Dent Assoc. 1974 Apr; 88:798-801.
  10. Mixed dentition analysis: a review of methods and their accuracy. International J Paediatr Dent 1995;5:137–142.
  11. The analysis of errors in orthodontic measurements. Am J Orthod 1983;83:382–390.
  12. Lingual eruption of permanent mandibular incisors behind the deciduous teeth: Clinical Evaluation. Hacettepe Dişhekimliği Fakültesi Dergisi 2007; 31:89-94.
  13. Caries experience in children with lingually erupted mandibular permanent incisors. J Pedod 1988; 12:176-8.
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