{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T11:19:44Z","timestamp":1789989584046,"version":"4.0.1"},"reference-count":38,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2012,5,2]],"date-time":"2012-05-02T00:00:00Z","timestamp":1335916800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Int Endodontic J"],"published-print":{"date-parts":[[2012,11]]},"abstract":"<jats:sec>\n                    <jats:label\/>\n                    <jats:p>\n                      <jats:bold>Tian Y.\u2010Y, Guo B, Zhang R, Yu X, Wang H, Hu T, Dummer PMH.<\/jats:bold>\n                      Root and canal morphology of maxillary first premolars in a Chinese subpopulation evaluated using cone\u2010beam computed tomography.\n                      <jats:italic>International Endodontic Journal.<\/jats:italic>\n                      ,\u00a0\n                      <jats:bold>45<\/jats:bold>\n                      , 996\u20131003, 2012.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>\n                      <jats:bold>Aim\u2002<\/jats:bold>\n                      To evaluate the external and internal anatomy of maxillary first premolar teeth in a Chinese subpopulation using cone\u2010beam computed tomography (CBCT).\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Methodology\u2002<\/jats:bold>\n                      A total of 300 CBCT images involving maxillary first premolar teeth were obtained from 241 patients who underwent CBCT scanning as part of an oral and dental examination for bone mass before placement of implants or to locate impacted teeth before orthodontic therapy. Tooth position, number of roots, canal configuration, number of canals and number of apical foramina\n                      <jats:italic>per<\/jats:italic>\n                      root were investigated. The Fisher\u2019s exact test was used to analyse the correlation between root number and tooth position.\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Results\u2002<\/jats:bold>\n                      Overall, 66% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u2003198) of teeth had one root and 33% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u2003100) had two roots; the remaining 1% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u20032) had three roots. This frequency distribution showed no statistical significance between left and right sides. The most frequent canal configuration of these maxillary first premolars was type IV (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u2003153; 51%), followed by type II (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u200370; 23%), with only 1% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u20032) of teeth having type VIII. One\u2010rooted teeth with canal bifurcations and\/or combinations (types II, III, V, VI and VII) accounted for nearly 50% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u200398) of the sample. Eighty\u2010five per cent (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u2003255) of the teeth examined had two root canals (types II\u2013VII), and 14% (\n                      <jats:italic>n<\/jats:italic>\n                      \u2003=\u200343) had one. Amongst the 59 patients with bilateral teeth, 38 had a symmetrical pattern of tooth anatomy, including the same number of roots and the same types of canal configurations.\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Conclusions\u2002<\/jats:bold>\n                      There was a high frequency of one\u2010rooted teeth amongst maxillary first premolars, with most having one root with two canals (types II\u2013VII). The morphology of the canal in one\u2010rooted teeth was highly variable.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/j.1365-2591.2012.02059.x","type":"journal-article","created":{"date-parts":[[2012,4,4]],"date-time":"2012-04-04T10:54:27Z","timestamp":1333536867000},"page":"996-1003","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":83,"title":["Root and canal morphology of maxillary first premolars in a Chinese subpopulation evaluated using cone\u2010beam computed tomography"],"prefix":"10.1111","volume":"45","author":[{"given":"Y.\u2010Y.","family":"Tian","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B.","family":"Guo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"X.","family":"Yu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T.","family":"Hu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P. 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