title: Incidence of lower second permanent molar impaction.
abstract: The incidence of lower second molar impaction was investigated, comparing the records of two samples of 200 orthodontic patients referred consecutively, in 1976 and 1986. A further study compared 50 cases showing both bilateral and unilateral impactions, with a non-impacted control group. This allowed possible causes of the impactions to be examined, particularly concerning the effect of premature loss of deciduous teeth on the distribution of crowding.
authors.affiliation: Bristol Dental Hospital.
authors.forename: R
authors.initials: R
authors.lastname: Evans
mesh_terms: D002648:Child; D015331:Cohort Studies; D004739:England; D006801:Humans; D008310:Malocclusion / Q000453:epidemiology; D008334:Mandible; D008963:Molar / Q000473:pathology; D014095:Tooth, Impacted / Q000453:epidemiology* / Q000473:pathology