{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T03:51:40Z","timestamp":1787025100788,"version":"build-2736575974"},"reference-count":62,"publisher":"The Angle Orthodontist (EH Angle Education & Research Foundation)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2013,7]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objective:<\/jats:title>\n                    <jats:p>To test the null hypothesis that orthodontic therapy with or without premolar extraction does not result in any difference in third molar impaction.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Materials and Methods:<\/jats:title>\n                    <jats:p>Two groups were formed: 22 patients in one group with first premolar extractions and 22 patients in the other group without extractions. All patients were nongrowing subjects who had normal gonial angles and were skeletal Class I at the beginning of treatment. The available space for third molars, inclination of second and third molars, and angle between the second and third molars were evaluated. Also, the correlation of measured parameters and type of orthodontic therapy with the eruption of third molars was evaluated.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>Of the third molars, 81.8% were impacted in the nonextraction group and 63.6% were impacted in the extraction group. Impaction of mandibular third molars was significantly correlated to the pretreatment and posttreatment inclination of third molars and the angle between the second and third molars. In the extraction therapy group, the retromolar distance increased significantly with a mean of 1.30 \u00b1 1.25\u00a0mm.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>When the inclination of the third molar is inconvenient, the tooth may remain impacted even if there is enough retromolar space.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2319\/101712-814.1","type":"journal-article","created":{"date-parts":[[2013,1,11]],"date-time":"2013-01-11T18:46:33Z","timestamp":1357929993000},"page":"572-577","source":"Crossref","is-referenced-by-count":42,"title":["Effect of premolar extraction on mandibular third molar impaction in young adults"],"prefix":"10.2319","volume":"83","author":[{"given":"\u00c7a\u011fr\u0131","family":"T\u00fcrk\u00f6z","sequence":"first","affiliation":[{"name":"Assistant Professor, Gazi University, Department of Orthodontics, Ankara, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00c7a\u011fr\u0131","family":"Ulusoy","sequence":"additional","affiliation":[{"name":"Associate Professor, Gazi University, Department of Orthodontics, Ankara, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1164","reference":[{"key":"i0003-3219-83-4-572-b01","series-title":"Oral Surg Oral Med Oral Pathol Oral Radiol Endod","first-page":"285","article-title":"Radiographic evaluation of mandibular third molar eruption space","volume":"88","author":"Hattab\n              FN,","year":"1999","unstructured":"Hattab\n              FN, \n            \n              Alhaija\n              ES. \n          \n          Radiographic evaluation of mandibular third molar eruption space. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1999;88:285\u2013291."},{"key":"i0003-3219-83-4-572-b02","series-title":"Community Dent Health","first-page":"121","article-title":"The prevalence of third molars in a Swedish population: an epidemiological study","volume":"5","author":"Hugoson\n              A,","year":"1988","unstructured":"Hugoson\n              A, \n            \n              Kugelberg\n              CF. \n          \n          The prevalence of third molars in a Swedish population: an epidemiological study. Community Dent Health. 1988;5:121\u2013138."},{"key":"i0003-3219-83-4-572-b03","series-title":"Am J Orthod Dentofacial Orthop","first-page":"628","article-title":"Third molars: a dilemma! Or is it","volume":"115","author":"Bishara\n              SE.","year":"1999","unstructured":"Bishara\n              SE. \n          \n          Third molars: a dilemma! Or is it? Am J Orthod Dentofacial Orthop. 1999;115:628\u2013633."},{"key":"i0003-3219-83-4-572-b04","series-title":"Impacted Teeth","author":"Alling\n              CC,","year":"1993","unstructured":"Alling\n              CC, \n            \n              Helfrick\n              JF, \n            \n              Alling\n              RD. \n          \n          Impacted Teeth. Philadelphia, Pa: W.B. Saunders; 1993."},{"key":"i0003-3219-83-4-572-b05","series-title":"Am J Orthod Dentofacial Orthop","first-page":"138","article-title":"Prevalence of third molar impaction in orthodontic patients treated nonextraction and with extraction of 4 premolars","volume":"123","author":"Kim\n              TW,","year":"2003","unstructured":"Kim\n              TW, \n            \n              Artun\n              J, \n            \n              Behbehani\n              F, \n            \n              Artese\n              F. \n          \n          Prevalence of third molar impaction in orthodontic patients treated nonextraction and with extraction of 4 premolars. 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Angle Orthod. 2005;75:719\u2013722."},{"key":"i0003-3219-83-4-572-b17","series-title":"Angle Orthod","first-page":"39","article-title":"Predicting angulational development and eruption of the lower third molar","volume":"48","author":"Haavikko\n              K,","year":"1978","unstructured":"Haavikko\n              K, \n            \n              Altonen\n              M, \n            \n              Mattila\n              K. \n          \n          Predicting angulational development and eruption of the lower third molar. 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