title: [A clinical evaluation of two new materials for restoration of dental wedge-shaped defects].
abstract: OBJECTIVE
  To evaluate clinically two new materials (Dyract Cem and 3M-Vitremer) for restoration of dental wedge-shaped defects with modified USPHS evaluation criterion.
  
  
  METHODS
  317 teeth with wedge-shaped defects were restored by Dyract Cem and 192 teeth by 3M-Vitremer clinically. The 1 year and 2 year follow-up results were evaluated with modified USPHS evaluation criterion.
  
  
  RESULTS
  1 year successful rate was 91.17% in Dyract Cem group and 81.77% in 3M-Vitremer group, and 2 years successful rates were 88.64% and 80.21% separately. The differences of successful rates between the two groups are significant statistically, but there are no significant differences in main indexes except stain rate when analysed item by item with USPHS evaluation criterion. Successful rates were related with the abrasive degree of the restored teeth.
  
  
  CONCLUSIONS
  Both Dyract Cem and 3M-Vitremer have high successful rates and a lot of advantages for restoration of dental wedge-shaped defects. The modified USPHS evaluation criterion is a valuable method for clinical evaluation.
authors.affiliation: Department of Stomatology, the Provincial Free Medical Clinics of Jiangxi, Nanchang 330046, China.
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D020770:Compomers / Q000627:therapeutic use*; D003188:Composite Resins / Q000627:therapeutic use*; D003793:Dental Restoration, Permanent; D005260:Female; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014072:Tooth Abrasion / Q000628:therapy*; D016896:Treatment Outcome
chemical_list: D020770:Compomers; D003188:Composite Resins; D005899:Glass Ionomer Cements; C084550:Vitremer; C400935:dyract-cem