Aim: To investigate presenting features of ectopically erupting first permanent molars and associations with other dental anomalies. Study Design: Prospective convenience study. Methods: 28 panoral radiographs were collected, over a 24-month period, of 7–11 year-old children with radiographic evidence of ectopic eruption of first permanent molars who presented to a Dental Teaching Hospital in England. A further 20 radiographs were collected of matched patients with no evidence of ectopic molar eruption. All radiographs were analysed under standard conditions to record the distribution and type of ectopic eruption (if present). In addition, the presence of the following dental anomalies was noted: cleft lip and/or palate; supernumerary teeth; hypodontia, and infraocclusion of primary molars. Chi-squared analysis was performed to determine any significant differences in the frequency of these dental anomalies between ectopic molar and control groups. Results: For patients with ectopic molar eruption, the majority demonstrated ectopic eruption of either one or two first permanent molars (32% and 57% of subjects respectively). There were a similar proportion of ‘jumps’ and ‘holds’. 92% of these were maxillary teeth and there was equal left and right distribution. Interestingly, a positive record of ectopic eruption was only documented in the dental records of 35% of these subjects. Children with ectopic eruption were significantly more likely to have at least one additional dental anomaly than was the case for the control group (60% versus 25%). Notably, primary molar infraocclusion and cleft lip/palate were significantly more frequent in the ectopic group. Conclusions: This study, the first in a British population, identified a significant association between ectopic eruption of first permanent molars and other dental anomalies. A multifactorial aetiology is thus supported and clinicians should be alert to the co-existence of ectopic eruption and other dental anomalies.
Ectopic eruption first permanent molar dental anomalies cleft lip and palate
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O’Meara WF. Ectopic eruption pattern in selected permanent teeth. J Dent Res 1962; 41:607–616.CrossRefGoogle Scholar
Pulver F. The etiology and prevalence of ectopic eruption of the maxillary first permanent molar. ASDC J Dent Child 1968; 35:138–146.PubMedGoogle Scholar
Ranalli DN et al. Comparative analysis of ectopic eruption of maxillary permanent first molars in children with clefts. ASDC J Dent Child 1986; 53:433–435.PubMedGoogle Scholar
Rinderer LA. Undermining resorption of second deciduous molars during eruption of 6th-year molars. Schweiz Monatsschr Zahnmed 1984; 94:471–497.PubMedGoogle Scholar
Cited in Andreasen JO et al. Textbook and Color Atlas of Tooth Impactions. Mosby, 1997.Google Scholar
Roberts MW. Treatment of ectopically erupting maxillary permanent first molars with a distal extended stainless steel crown. ASDC J Dent Child 1986; 53:430–2.PubMedGoogle Scholar
Silva Filho OG et al. Ectopic eruption of maxillary first permanent molars in children with cleft lip. Angle Orthod 1996; 66:373–380.PubMedGoogle Scholar
Wäckerle-Heporauta E. Häufigkeit und Anmass der beim Durchbruch oberer 6-Molaren auftretenden unterminierenden Resorptionen benachbarter Milchfünfter. Thesis, Zürich 1981. Cited in: Bjerklin Ket al. Ectopic eruption of the maxillary first permanent molars in children with cleft lip and/ or palate. Eur J Orthod 1993; 15:535–540.CrossRefGoogle Scholar
Young DH. Ectopic eruption of the first permanent molar. ASDC J Dent Child 1957; 24:153–162.Google Scholar