title: [Early cracked teeth: clinical analysis of 70 cases].
abstract: OBJECTIVE
  To determine the clinical features and x-ray findings in early cracked teeth,in order to provide theoretical basis.
  
  
  METHODS
  86 cracked teeth in 70 cases were reviewed. Analysis of x-ray and articulation paper examination was combined. The teeth were repaired with composite resins.
  
  
  RESULTS
  The study showed that the incidence of cracked first maxillary molar was highest in patients aged form 40 to 50 years. X-ray demonstrated characteristic changes of the diseased periodontal tissues in 57% teeth. Contour deformities were found in 19% affected roots. The efficacy rate 1 year after treatment was 90.9%.
  
  
  CONCLUSIONS
  The features of periodontal supporting tissues illustrating on x-ray films are considered to be useful to aid the diagnosis and treatment of early cracked teeth.
authors.affiliation: Shanghai Pacific Dental Hospital, Shanghai 200080, China.
authors.forename: X D
authors.initials: XD
authors.lastname: Liu