Dentoskeletal features in individuals with ectopic eruption of the permanent maxillary first molar

Abstract

ObjectiveThe aim of the study was to analyze the prevalence and distribution of ectopic eruption of the permanent maxillary first molar (EEM) in individuals scheduled for orthodontic treatment and to investigate the association of EEM with dental characteristics, maxillary skeletal features, crowding, and other dental anomalies.MethodsA total of 1,317 individuals were included and randomly divided into two groups. The first 265 subjects were included as controls, while the remaining 1,052 subjects included the sample from which the final experimental EEM group was derived. The mesiodistal (M-D) crown width of the deciduous maxillary second molar and permanent maxillary first molar, maxillary arch length (A-PML), maxillomandibular transverse skeletal relationships (anterior and posterior transverse interarch discrepancies, ATID and PTID), maxillary and mandibular tooth crowding, and the presence of dental anomalies were recorded for each subject, and the statistical significance of differences in these parameters between the EEM and control groups was determined using independent sample t-tests. Chi-square tests were used to compare the prevalence of other dental anomalies between the two groups.ResultsThe prevalence of maxillary EEM was 2.5%. The M-D crown widths, ATID and PTID, and tooth crowding were significantly greater, while A-PML was significantly smaller, in the EEM group than in the control group. Only two subjects showed an association between EEM and maxillary lateral incisor anomalies, which included agenesis in one and microdontia in the other.ConclusionsEEM may be a risk factor for maxillary arch constriction and severe tooth crowding.

Prevalence and distribution of selected dental anomalies among saudi children in Abha, Saudi Arabia

“…In the present study, the prevalence of ectopic eruption was found to be 2.3% which was in accordance with the finding reported by Mucerdo et al (29). But contrary to that of Afify et al (30), who reported ectopic eruption as low as 0.7% in Saudi population.…”

Association between Ectopic Eruption of the Maxillary First Permanent Molar and Skeletal Malocclusion

“…Chintakanon and Boonpinon [13] measured the SNA, SNB, and ANB angles, soft tissue facial convexity, maxillary length (ANS-PNS), and mandibular length (Co-Pg), and found no significant differences in these measurements between the ectopic eruption group and the normal eruption group. Mucedero et al [22] measured the maxillary arch lengths, the intercanine widths, and the intermolar widths, to assess the skeletal features of the maxillary arches of patients with ectopic eruption of the maxillary first permanent molar. Their findings indicated that the maxillary arches were shorter and narrower in the ectopic eruption group than those of the normal eruption group.…”

Common dental diseases in children and malocclusion

“…Factors accounting for EEM include macrodontia in the permanent maxillary dentition, maxillary hypoplasia, and abnormal eruption angle of the maxillary permanent first molar. 42 The prevalence of EEM varies from 0.75% to 6%. 42 Ectopic eruption affects males more frequently than females and 66% of ectopic eruption takes place in the maxilla, unilaterally or bilaterally.…”

“… 42 The prevalence of EEM varies from 0.75% to 6%. 42 Ectopic eruption affects males more frequently than females and 66% of ectopic eruption takes place in the maxilla, unilaterally or bilaterally. EEM has a tendency to cause premature loss of maxillary deciduous second molar and decrease of the arch length (Fig.…”