Fogel H M, Peikoff M D, Christie W H
Department of Restorative Dentistry, Faculty of Dentistry, University of Manitoba, Winnipeg, Canada.
J Endod. 1994 Mar;20(3):135-7. doi: 10.1016/S0099-2399(06)80059-2.
Surgical telescopes, headlamps, and a modified access preparation were used clinically to aid in the search for mesiolingual canals in the mesiobuccal roots of 208 maxillary first molars. In 148 (71.2%) of the mesiobuccal roots two canals were located and treated. Of these, 66 (31.7%) had two separate apical foramina (Weine Type III) and 82 (39.4%) had two canals that joined (Weine Type II). In 60 (28.9%) cases only one canal was located.
手术显微镜、头灯以及改良的入路准备在临床上用于辅助寻找208颗上颌第一磨牙近中颊根中的近中舌侧根管。在148个（71.2%）近中颊根中发现并处理了两条根管。其中，66个（31.7%）有两个独立的根尖孔（Weine III型），82个（39.4%）有两条合并的根管（Weine II型）。在60个（28.9%）病例中仅发现一条根管。
