title: Precision diagnosis and antidiastole on supernumerary cusp of tooth by CBCT.
abstract: OBJECTIVE
  Based on a case of supernumerary cusp on the bucca of left maxillary second molar diagnosed by cone beam computed tomography (CBCT), its genesis, diagnosis and antidiastole are to be analysed. The clinic implication of CBCT is correspondingly discussed.
  
  
  METHODS
  The supernumerary cusp was diagnosed by oral general examination, intra-oral radiograph and CBCT. The features of supernumerary cusp, fused tooth, geminated tooth and concrescence tooth, especially differentiate points among them were discussed.
  
  
  RESULTS
  The case of supernumerary cusp on the bucca of left maxillary second molar was diagnosed definitely by the combined application of oral general examination, periapical radiograph and CBCT.
  
  
  CONCLUSIONS
  Supernumerary cusp on the bucca of left maxillary second molar is a rare phenomenon, which is difficult to be differentiated from other tooth deformities. CBCT can improve accuracy of diagnosis.
authors: School of Dentistry, Lanzhou University, No. 199 Donggang Xi Lu, Lanzhou, 730000, Gansu Province, China.
authors: Keyu
authors: K
authors: Jiang
authors: School of Dentistry, Lanzhou University, No. 199 Donggang Xi Lu, Lanzhou, 730000, Gansu Province, China.
authors: Chunxiao
authors: C
authors: Che
authors: School of Dentistry, Lanzhou University, No. 199 Donggang Xi Lu, Lanzhou, 730000, Gansu Province, China.
authors: Zhangfan
authors: Z
authors: Ding
authors: School of Dentistry, Lanzhou University, No. 199 Donggang Xi Lu, Lanzhou, 730000, Gansu Province, China.
authors: Sa
authors: S
authors: Zeng
authors: School of Dentistry, Lanzhou University, No. 199 Donggang Xi Lu, Lanzhou, 730000, Gansu Province, China.
authors: Weiping
authors: W
authors: Wang
authors: School of Dentistry, Lanzhou University, No. 199 Donggang Xi Lu, Lanzhou, 730000, Gansu Province, China. hexy@lzu.edu.cn.
authors: Xiangyi
authors: http://orcid.org/0000-0003-4105-5609
authors: X
authors: He
mesh_terms: D000328:Adult; D054893:Cone-Beam Computed Tomography; D006801:Humans; D008297:Male; D011861:Radiography, Dental; D014071:Tooth Abnormalities / Q000000981:diagnostic imaging*
keywords: Concrescence tooth; Cone beam computed tomography; Fused tooth; Geminated tooth; Maxillary second molar; Supernumerary cusp