{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T11:43:00Z","timestamp":1790854980607,"version":"4.1.0"},"reference-count":17,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[1996,5,1]],"date-time":"1996-05-01T00:00:00Z","timestamp":830908800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["British Journal of Orthodontics"],"published-print":{"date-parts":[[1996,5]]},"abstract":"<jats:p> There is some controversy over whether the extraction of upper second permanent molars as part of orthodontic treatment leads to the over eruption of unopposed lower second permanent molars. A study was established to investigate the presence of any over-eruption in a group of subjects who had upper second permanent molars extracted as part of a previous course of orthodontic treatment. These subjects (the experimental group) were compared with a control group of subjects, matched for age and sex. Upper and lower impressions were taken, and the vertical positions of the posterior teeth were objectively assessed from the study models using the travelling microscope. <\/jats:p><jats:p> Measurements from the study models showed that the distal aspect of the lower second permanent molar had over erupted in the experimental group when compared to the control (P &lt;0\u00b7001 right, P&lt;0\u00b705 left). The degree of over-eruption was influenced on the mesial aspect by the distal position of the upper first permanent molar (P&lt;0\u00b701), but the distal aspect was not. Eruption of the upper third molar did not affect the over-eruption of the lower second permanent molar in the experimental group. The majority of upper third molars had erupted at least 3 years since the upper second molars had been extracted, but the majority had erupted into an unfavourable contact position with the Just permanent molar. <\/jats:p>","DOI":"10.1179\/bjo.23.2.109","type":"journal-article","created":{"date-parts":[[2014,12,16]],"date-time":"2014-12-16T13:23:29Z","timestamp":1418736209000},"page":"109-114","source":"Crossref","is-referenced-by-count":19,"title":["The Effects of Extracting Upper Second Permanent Molars on Lower Second Permanent Molar Position"],"prefix":"10.1177","volume":"23","author":[{"given":"R.","family":"Smith","sequence":"first","affiliation":[{"name":"Basingstoke District Hospital & Kings College Hospital Medical & Dental School"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[1996,5,1]]},"reference":[{"key":"bibr1-bjo.23.2.109","doi-asserted-by":"publisher","DOI":"10.1179\/bjo.14.3.147"},{"key":"bibr2-bjo.23.2.109","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(61)90191-9"},{"key":"bibr3-bjo.23.2.109","doi-asserted-by":"publisher","DOI":"10.1016\/0003-9969(66)90120-8"},{"key":"bibr4-bjo.23.2.109","unstructured":"CryerB. S. (1966) Third molar eruption and the effect of extraction of adjacent teeth, Transactions of the British Society for the Study Orthodontics, 1966\/67, 51\u201364."},{"key":"bibr5-bjo.23.2.109","volume-title":"Statistical Methods for Medical and Biological Students, Interscience publications","author":"Dahlberg G.","year":"1940"},{"key":"bibr6-bjo.23.2.109","doi-asserted-by":"publisher","DOI":"10.1179\/bjo.14.1.1"},{"key":"bibr7-bjo.23.2.109","volume-title":"A Textbook of Orthodontics","author":"Foster T. D.","year":"1990"},{"key":"bibr8-bjo.23.2.109","volume-title":"Occlusion in Restorative Dentistry, Technique and Theory","author":"Gross M. D.","year":"1982"},{"key":"bibr9-bjo.23.2.109","doi-asserted-by":"publisher","DOI":"10.1016\/0889-5406(86)90001-6"},{"key":"bibr10-bjo.23.2.109","volume-title":"A Textbook of Orthodontics","author":"Huston W. J. B. It.","year":"1986"},{"key":"bibr11-bjo.23.2.109","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9416(77)90329-3"},{"key":"bibr12-bjo.23.2.109","volume-title":"Principles and Practice of Orthodontics","author":"Mills J. R. E.","year":"1987"},{"key":"bibr13-bjo.23.2.109","volume-title":"Handbook of Orthodontics","author":"Moyers R. E.","year":"1988"},{"key":"bibr14-bjo.23.2.109","first-page":"5","volume-title":"General Dental Practice, a Handbook of Primary Dental Care","author":"Orton H. S.","year":"1978"},{"key":"bibr15-bjo.23.2.109","volume-title":"Contemporary Orthodontics","author":"Proffit W. R.","year":"1986"},{"key":"bibr16-bjo.23.2.109","volume-title":"Occlusion","author":"Ramfjord S.","year":"1983"},{"key":"bibr17-bjo.23.2.109","first-page":"215","volume":"1974","author":"Wilson H. E.","year":"1974","journal-title":"Transactions of the European Orthodontics Society."}],"container-title":["British Journal of Orthodontics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1179\/bjo.23.2.109","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1179\/bjo.23.2.109","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T01:53:32Z","timestamp":1741658012000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1179\/bjo.23.2.109"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1996,5]]},"references-count":17,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1996,5]]}},"alternative-id":["10.1179\/bjo.23.2.109"],"URL":"https:\/\/doi.org\/10.1179\/bjo.23.2.109","relation":{},"ISSN":["0301-228X"],"issn-type":[{"value":"0301-228X","type":"print"}],"subject":[],"published":{"date-parts":[[1996,5]]}}}