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

Abstract

PurposeThe 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 methodsThis 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.ResultsOf 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).ConclusionTo 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.

Ectopic eruption of maxillary permanent first molars: Predictive factors for self‐corrected and impacted outcome

“…When the distribution of ectopic eruption according to the jaw‐side is examined, higher prevalence on right side than left side was found in this study. This finding was compatible with many studies 3,20 . It is stated in the literature that this situation can be associated with other multi‐factor abnormalities and side frequency variations 3,20 …”

“…This finding was compatible with many studies 3,20 . It is stated in the literature that this situation can be associated with other multi‐factor abnormalities and side frequency variations 3,20 …”

“…Based on this study, between the angle of long axis and occlusal line of PFM and PSM was measured using panoramic radiograph. 3,8,20 In this study findings showed that negative vertical angles and mean values was found more in impacted PFM consistent with the results in Sun et al 8 However, the results of this study at negative horizontal angles for impacted PFM were not consistent with previous study. 8 This may be because of the many factors affecting eruption status 7,9,10 and methodological differences with Sun et al study.…”

“…Previous studies indicated that increase in negative vertical angle of PFM were significant factors of impacted ectopic eruption of the PFM. Based on this study, between the angle of long axis and occlusal line of PFM and PSM was measured using panoramic radiograph 3,8,20 . In this study findings showed that negative vertical angles and mean values was found more in impacted PFM consistent with the results in Sun et al 8 However, the results of this study at negative horizontal angles for impacted PFM were not consistent with previous study 8 .…”

“…3,20 It is stated in the literature that this situation can be associated with other multi-factor abnormalities and side frequency variations. 3,20 Previous studies indicated that increase in negative vertical angle of PFM were significant factors of impacted ectopic eruption of the PFM. Based on this study, between the angle of long axis and occlusal line of PFM and PSM was measured using panoramic radiograph.…”