Prevalence of ectopic eruption, impaction, retention and agenesis of the permanent second molar

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Bondemark, LarsMalmö högskola,Odontologiska fakulteten (OD) (author)

Prevalence of ectopic eruption, impaction, retention and agenesis of the permanent second molar

Article/chapterEnglish2007

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Angle Orthodontist,2007
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LIBRIS-ID:oai:DiVA.org:mau-15337
https://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-15337URI
https://doi.org/10.2319/072506-306.1DOI

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Language:English
Summary in:English

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Subject category:pop swepub-contenttype
Subject category:art swepub-publicationtype

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OBJECTIVE: To elucidate the prevalence of ectopic eruption, impaction, and primary and secondary retention as well as agenesis of the permanent second molar (M2) among adolescents. MATERIALS AND METHODS: After a sample size calculation, dental records, including radiographs, of 1543 patients (722 girls and 821 boys), from three clinics in the city of Malmoe, Sweden, were retrospectively analyzed. Series of annual records and radiographs were examined for all patients from 10 to 16 years of age and were carried out during 2004-2006. The prevalence of ectopic eruption, impaction, and primary and secondary retention as well as agenesis of M2s was registered in a standardized manner and according to preset definitions. In addition, the times of emergence of the M2s were recorded. RESULTS: The prevalence of ectopic eruption of M2 was 1.5%, the prevalence of primary retention was 0.6%, and the prevalence of impaction was 0.2%. This means that the overall prevalence of eruption disturbances was 2.3%. In addition, the prevalence of agenesis was 0.8%. The prevalence of ectopic eruption was significantly higher in the mandible. Those patients with eruption disturbances and agenesis of M2 showed significantly delayed eruption of their other M2s compared to the individuals without any eruption disturbances. CONCLUSIONS: The prevalence of eruption disturbances was higher than reported earlier, and, even if the disturbances do not occur frequently, it is important to develop an early diagnosis in order to start the treatment at the optimal time.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Odontologi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Dentistry hsv//eng

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Tsiopa, Jola (author)
Malmö högskolaOdontologiska fakulteten (OD) (creator_code:org_t)

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In:Angle orthodontist: Angle Orthodontist77:5, s. 773-7780003-32191945-7103

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By the author/editor: Bondemark, Lars; Tsiopa, Jola

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Dentistry

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By the university: Malmö University

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