Can crown-root ratio predict premolar eruption?

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
Paul RowlandsNick Steen

Abstract

The purpose of this study was to establish a method to prospectively predict the eruption of mandibular second premolars with panoramic radiographs. This technique could be used clinically to optimize the timing of comprehensive treatment, detect abnormalities of development and eruption, or effectively estimate eruption timing and determine the need for early intervention because of caries or defects of the deciduous dentition. Three hundred one white children from an orthodontic practice in Alaska between the ages of 6 and 16 years were examined and monitored with serial panoramic radiographs until all premolars had erupted. Eruption of the mandibular second premolar was predicted at the first examination based on the panoramic radiograph. When the mandibular second premolar erupted, a researcher measured the crown length to crown-plus-root length ratio on the radiograph using the Simpson and Kunos scale, and the prospectively predicted timing of eruption was compared with the actual timing. The Simpson and Kunos scale allowed a rapid assessment for predicting the time of eruption of mandibular second premolars. The mean age of eruption of the mandibular second premolar in these children was 12.5 years.

References

Feb 19, 1980·British Dental Journal·A Sheiham
Oct 17, 1998·Journal of Human Evolution·S W Simpson, C A Kunos
Nov 1, 1963·Journal of Dental Research·C F MOORREESE E HUNT

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Citations

Apr 6, 2012·The Angle Orthodontist·Eduardo Martinelli de LimaFernando Lima Martinelli
Dec 7, 2010·American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics·Shelley L Smith, Peter H Buschang
Jan 19, 2008·Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons·Ryosuke FujiiTadaaki Kirita
Feb 4, 2009·American Journal of Human Biology : the Official Journal of the Human Biology Council·Shelley L Smith, Peter H Buschang
Nov 2, 2016·The Angle Orthodontist·Mariana Roennau Lemos RinaldiRoberto Vanin Pinto Ribeiro
Sep 24, 2021·Journal of Orthodontics·Stephanie CornsPadhraig S Fleming

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