Impaction of permanent mandibular second molar: a retrospective study
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Impaction of permanent mandibular second molar: a retrospective study

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Impaction of permanent mandibular second molar: a retrospective study

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dc.contributor.author Cassetta, Michele es
dc.contributor.author Altieri, Federica es
dc.contributor.author Di Mambro, Alfonso es
dc.contributor.author Galluccio, Gabriella es
dc.contributor.author Barbato, Ersilia es
dc.date.accessioned 2014-05-29T07:11:37Z
dc.date.available 2014-05-29T07:11:37Z
dc.date.issued 2013 es
dc.identifier.uri http://hdl.handle.net/10550/35660
dc.source Cassetta, Michele ; Altieri, Federica ; Di Mambro, Alfonso ; Galluccio, Gabriella ; Barbato, Ersilia. Impaction of permanent mandibular second molar: a retrospective study. En: Medicina oral, patología oral y cirugía bucal. Ed inglesa, 2013, Vol. 18, No. 4: 564-568 es
dc.subject Odontología es
dc.subject Ciencias de la salud es
dc.title Impaction of permanent mandibular second molar: a retrospective study es
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::CIENCIAS MÉDICAS es
dc.description.abstractenglish Objective: To determine the prevalence of impacted mandibular second molar (MM2) and the association between MM2 impaction and crowding. The clinical significance of the angle between first and second mandibular molar and of the space between the first mandibular molar (MM1) and the anterior margin of mandibular ramus in MM2 impaction were also evaluated. Material and Methods: In this retrospective study , from the dental records of 2,945 caucasian young orthodontics patients, 40 subjects with MM2 impaction were included in a study group (SG) and compared with a control group (CG) of 200 subjects without MM2 impactions. The crowding, the angle of inclination of MM2, the distance between MM1 and mandibular ramus, the canine and molar relationships, and the lower centre line discrepancy were measured. For the statistical analysis , descriptive statistics and t-Student for independent sample groups were used. Results: The prevalence of impacted MM2 was 1.36%. The independent-Samples t-Test between SG and CG showed: the presence of crowding (P<=0.001), an higher angle values of MM2 inclination (P<=0.001) and a smaller distance between MM1 and the anterior margin of mandibular ramus (P<=0.001) in the SG. Conclusion: The impaction of MM2 is a relatively rare occurrence in orthodontic caucasian populations. The crowding, a higher angle values of MM2 inclination and a reduced distance between MM1 and the anterior margin of mandibular ramus, at the time of one third of MM2 root formation (T1), characterize MM2 impaction. es

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