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No obvious missing teeth or other gross abnormalities associated with the oral cavity were observed. Upon anesthetized radiographic evaluation, the presence of an unerupted, abnormally positioned, supernumerary premolar tooth was observed. The following article describes the extraction of the right mandibular first molar tooth (409) as well as the unerupted supernumerary premolar tooth with associated supernumerary root and the diagnostic approach taken for this uncommon abnormality.<\/jats:p>","DOI":"10.1177\/08987564211052102","type":"journal-article","created":{"date-parts":[[2021,10,28]],"date-time":"2021-10-28T11:11:15Z","timestamp":1635419475000},"page":"152-160","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Unerupted Supernumerary Mandibular Fourth Premolar in a dog"],"prefix":"10.1177","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7860-7465","authenticated-orcid":false,"given":"Brenda L.","family":"Mulherin","sequence":"first","affiliation":[{"name":"Associate Clinical Professor, Dentistry and Oral Surgery, Veterinary Clinical Sciences, Lloyd Veterinary Medical Center, 1809 S Riverside Drive, Ames, Iowa 50011 to 1250"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin","family":"White","sequence":"additional","affiliation":[{"name":"Radiology Resident, Lloyd Veterinary Medical Center, 1809 S Riverside Drive, Ames, Iowa 50011 to 1250"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2021,10,28]]},"reference":[{"key":"bibr1-08987564211052102","doi-asserted-by":"publisher","DOI":"10.4317\/jced.51499"},{"issue":"11","key":"bibr2-08987564211052102","first-page":"612","volume":"65","author":"Garvey M","year":"1999","journal-title":"J. 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