title: [Evaluation clinical long-term curative effect and analysis of its influence factors after restoration of teeth with wedge-shaped defects].
abstract: OBJECTIVE
  To evaluate the long-term curative effect clinically and analysis of its influence factors after restoration of teeth with wedge-shaped defects.
  
  
  METHODS
  Seventy five cases of 509 teeth with various degrees of dental wedge-shaped defects were randomly divided into two groups--the group restored by Dyract Cement and the group restored by 3M-Vitremer. Evaluation was made with the modified USPHS evaluation criterion after restoration for 1,2,4 years respectively.
  
  
  RESULTS
  The successful rate dropped down from 2 year successful rate 85.5% to 4-year 27.7%. The new wedge-shaped defects were presented at the cervical margin of the original restoration in 1.8% (2 years later) and 6.6% (4 years later). There were a lot of influence factors on long-term curative effect. The failure rate in the group with occlusal interference was significantly higher than that without occlusal interference.
  
  
  CONCLUSIONS
  The clinical successful rates are affected by the value of occlusal force on the restored teeth and the physical properties of the restorative materials. It is suggested that the process of restoration of dental wedge-shaped defect should include obviating occlusal factors as well as to improve the properties of restorative materials.
authors.affiliation: Department of Stomatology, Affiliated Medical Clinics of Jiangxi Provicial Hospital, Nanchang 330046, China.
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Wang
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D003793:Dental Restoration, Permanent; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D014072:Tooth Abrasion / Q000628:therapy*; D014077:Tooth Erosion / Q000628:therapy*