Prevalence of ectopic eruption of first permanent molars in a Turkish population

Year 2018, Volume: 52 Issue: 1, 1 - 5, 03.01.2018

Yeliz Güven

Abstract

DOI: 10.26650/eor.2018.45227

Purpose

The aim of this study was to investigate
the prevalence and characteristics of ectopically erupting first permanent
molars (FPMs) in children attending the clinics of the Pediatric Dentistry
Department at İstanbul University.

Materials and methods

This retrospective study was performed
using panoramic radiographs of 7,649 patients (3,506 females and 4,143 males)
aged from 5 to 11 years. The age and gender of the subjects, the number and
location of the ectopic molars, bilateral versus unilateral occurrence, the
degree of resorption of the roots of the primary molars, and other associated
dental anomalies were assessed. Ectopic eruption was categorized according to a
grading system based on the resorption rates of the primary molars.

Results

Of the 7,649 reviewed subjects, 203 (118
males and 85 females) were diagnosed with ectopic eruption of the FPMs,
resulting in a frequency of 2.65%. The mean age of the subjects with ectopic
FPMs was 6.82±1.25 (range: 5–11) years. Of the 273 ectopic FPMs, 157 (57.5%)
were detected in the maxilla and 116 (42.5%) in the mandible. Severe and very
severe degrees of ectopic eruption were found to be more common in the maxilla
than in the mandible, whereas a moderate degree of ectopic eruption was more
prevalent in the mandible (p=0.251).

Conclusion

To our knowledge, this is the first study
in a Turkish population reporting the prevalence of ectopic eruption of FPMs.
Although the difference between the right and the left sides was not
significant, the severity of ectopic eruption was different between the maxilla
and the mandible. 

Keywords

Ectopic eruption, prevalence, resorption of primary second molar, panoramic radiography, pedodontics

References

• 1. Chintakanon K, Boonpinon P. Ectopic eruption of the first permanent molars: Prevalence and etiologic factors. Angle Orthod 1998; 68: 153-60. 2. Mooney GC, Morgan AG, Rodd HD, North S. Ectopic eruption of first permanent molars: Presenting features and associations. Eur Arch Paediatr Dent 2007; 8: 153-7. 3. Bjerklin K, Kurol J. Ectopic eruption of the maxillary first permanent molar: Etiologic factors. Am J Orthod 1983; 84: 147-155. 4. Bondemark L, Tsiopa J. Prevalence of ectopic eruption, impaction, retention and agenesis of the permanent second molar. Angle Orthod 2007; 77: 773-8. 5. Kimmel NA, Gellin ME, Bohannan HM, Kaplan AL. Ectopic eruption of maxillary first permanent molars in different areas of the united states. ASDC J Dent Child 1982; 49: 294-299. 6. Kurol J, Bjerklin K. Ectopic eruption of maxillary first permanent molars: A review. ASDC J Dent Child 1986; 53: 209-14. 7. Baccetti T. A clinical and statistical study of etiologic aspects related to associated tooth anomalies in number, size, and position. Minerva Stomatol 1998; 47: 655-63. 8. Bjerklin K, Kurol J, Valentin J. Ectopic eruption of maxillary first permanent molars and association with other tooth and developmental disturbances. Eur J Orthod 1992; 14: 369-375. 9. Pulver F. The etiology and prevalence of ectopic eruption of the maxillary first permanent molar. ASDC J Dent Child 1968; 35: 138-46. 10. Kurol J, Bjerklin K. Ectopic eruption of maxillary first permanent molars: Familial tendencies. ASDC J Dent Child 1982; 49: 35-8. 11. Barberia-Leache E, Suarez-Clua MC, Saavedra-Ontiveros D. Ectopic eruption of the maxillary first permanent molar: Characteristics and occurrence in growing children. Angle Orthod 2005; 75: 610-5. 12. Larson M, Hellquist R, Jakobsson OP. Dental abnormalities and ectopic eruption in patients with isolated cleft palate. Scand J Plast Reconstr Surg Hand Surg 1998; 32: 203-12. 13. Bjerklin K, Kurol J, Paulin G. Ectopic eruption of the maxillary first permanent molars in children with cleft lip and/or palate. Eur J Orthod 1993; 15: 535-40. 14. Carr GE, Mink JR. Ectopic eruption of the first permanent maxillary molar in cleft lip and cleft palate children. ASDC J Dent Child 1965; 32: 179-88. 15. da Silva Filho OG, De Albuquerque MV, Kurol J. Ectopic eruption of maxillary first permanent molars in children with cleft lip. Angle Orthod 1996; 66: 373-80. 16. Salbach A, Schremmer B, Grabowski R, Stahl de Castrillon F. Correlation between the frequency of eruption disorders for first permanent molars and the occurrence of malocclusions in early mixed dentition. J Orofac Orthop 2012; 73: 298-306. 17. Bjerklin K, Kurol J. Prevalence of ectopic eruption of the maxillary first permanent molar. Swed Dent J 1981; 5: 29-34.