title: [Location and dilation of the second mesiobuccal canals in maxillary molars.].
abstract: OBJECTIVE
  To Locate and dilate the second mesiobuccal canals(MB2) in clinical treatment and in extracted molars in maxillary molars.
  
  
  METHODS
  11 extracted maxillary molars were studied. MB2s were searched and dilate the canals were filled with gutta-percha and then x ray film were taken. 146 maxillary molars included 94 maxillary first molars and 52 maxillary second molars were attempted to locate and dilate for MB2.Then root canal treatment was carried out in molars and x ray film were taken.
  
  
  RESULTS
  MB2 canal can be located in 60% and dilate 50% of 10 extracted maxillary first molars. MB2 canal can be located in 44.68% and dilated in 29.78% of maxillary first molars. MB2 canal can be in located in 11.53% and dilated in 7.69% of maxillary second molars.
  
  
  CONCLUSIONS
  The occurrence of MB2 is high in maxillary first molars. Although there are many difficulties in location and dilate of MB2, attempt should be conducted to explore in order to increase rate incidence of root canal therapy.
authors.affiliation: Department of Stomatology, First Hospital of Wuhan City, Wuhan 430022, Hubei Province, China.
authors.forename: Wei-zhen
authors.initials: WZ
authors.lastname: Wang
mesh_terms: D003786:Dental Pulp Cavity; D006171:Gutta-Percha; D006801:Humans; D008437:Maxilla; D008963:Molar; D012390:Root Canal Therapy / Q000379:methods
chemical_list: D006171:Gutta-Percha