Helm, AlexandraMartín Vacas, AndreaMolinero Mourelle, PedroCaleya Zambrano, Antonia MaríaGallardo López, Nuria EstherMourelle Martínez, Rosa2024-10-232024-10-232021-06-06Helm, A.; Martín-Vacas, A.; Molinero-Mourelle, P.; Caleya, A.M.; Gallardo, N.E.; Mourelle-Martínez, M.R. Ectopic Eruption of Maxillary First Permanent Molars: Preliminary Results of Prevalence and Dentoskeletal Characteristics in Spanish Paediatric Population. Children 2021, 8, 479. https:// doi.org/10.3390/children80604792227-906710.3390/children8060479https://hdl.handle.net/20.500.14352/109318The ectopic eruption of the maxillary first permanent molar (EEM) is a local alteration of dental eruption with a multifactorial aetiology. The aims of our study were to determine the prevalence of the EEM in children and to analyse whether there is a relationship between EEM and dento-skeletal characteristics. A total of 322 children were analysed with the Ricketts cephalometric study and descriptive and analytical statistical analysis was carried out. The prevalence of EEM was 8.7%, with no statistically significant differences regarding gender or location, but a higher prevalence in the 7-year-old age group (18.8%) and bilateral EEM was more prevalent than unilateral EEM (p < 0.05). The most frequent findings were a shortened anterior cranial base, a retroposition of the maxilla and a distal position of the upper permanent first molar in relation to the pterygoid vertical in children with EEM. No statistically significant differences were found regarding the cephalometric parameters except a decreased palatal plane in the bilateral EEM group and a distal upper incisor position in the EEM group (p < 0.05). In conclusion, the prevalence of the EEM was 8.7%, more frequently bilateral, and significantly in seven-year-old patients. Children with bilateral EEM have decreased palatal plane values and a more posterior position of the upper incisorengAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Ectopic eruption of maxillary first permanent molars: Preliminary results of prevalence and dentoskeletal characteristics in Spanish paediatric populationjournal articlehttps//doi.org/10.3390/children806047934204053https://www.mdpi.com/journal/childrenopen access616.314-053.2Tooth eruptionEctopyEruptionMolarFirst permanent molarOrthodontics interceptivePatient care planningChildrenOdontología infantil3299 Otras Especialidades Médicas