title: A rare case of unerupted second deciduous molar located inferior to the second premolar: case report.
abstract: OBJECTIVE
  Tooth eruption is defined as the movement of a tooth from its site of development within the alveolar process to its functional position in the oral cavity [Massler et al., 1941]. The process of tooth eruption can be divided into different phases: pre-eruptive bone stage, alveolar bone stage, mucosal stage, preocclusal stage, occlusal stage and maturation stage [Andreasen et al., 1997]. Any disturbance in these phases can lead to eruptive anomalies. The incidence of unerupted teeth is usually higher among permanent teeth than among deciduous ones [Walker et al., 2004; Otsuka et al., 2001; Amir et al., 1982; Broadway, 1976; Pinborg et al., 1970]. Of the primary teeth reported as unerupted, second primary molars are the teeth most frequently involved [Walker et al., 2004; Otsuka et al., 2001; Bianchi et al., 1991; Ranta et al., 1988; Tsukamoto et al., 1986; Amir et al., 1982], followed by primary central incisors [Otsuka et al., 2001].
  
  
  METHODS
  This paper presents a case of inversion of the intraosseous position of a second unerupted deciduous molar and the succedaneous second premolar.
authors.affiliation: Cittadella Hospital, Cittadella, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Ferro
authors.forename: A
authors.initials: A
authors.lastname: Besostri
authors.forename: E
authors.initials: E
authors.lastname: Stellini
authors.forename: G
authors.initials: G
authors.lastname: Denotti
authors.forename: A
authors.initials: A
authors.lastname: Canesso
mesh_terms: D001641:Bicuspid / Q000473:pathology*; D002648:Child; D006801:Humans; D008297:Male; D008963:Molar / Q000473:pathology*; D011862:Radiography, Panoramic; D014079:Tooth Eruption, Ectopic / Q000150:complications* / Q000473:pathology / Q000601:surgery; D014081:Tooth Extraction; D014094:Tooth, Deciduous / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D014095:Tooth, Impacted / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery; D014097:Tooth, Unerupted / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery