title: Effect of different prophylaxis methods on microleakage of microfilled composite restorations.
abstract: OBJECTIVE
  This study was aimed at evaluating the effect of different prophylaxis methods on microleak-age of microfilled composite restorations.
  
  
  METHODS
  In this in vitro study, class V cavities were prepared on buccal surfaces of 84 bovine teeth. The teeth were restored with Tetric N-Bond adhesive and Heliomolar composite resin. Subsequent to a thermocycling procedure and three months of storage in distilled water, the teeth were randomly assigned to four groups (n=21): (1) prophylaxis with a rubber cup and pumice; (2) prophylaxis with a brush and pumice; (3) prophylaxis with air/powder polishing device; and (4) no prophylaxis (the control group). Then the teeth were immersed in 2% basic fuchsin for 24 hours and sectioned for microleakage evaluation under a stereomicroscope. Data were analyzed using Kruskal-Wallis and Wilcoxon Signed Rankstests. Statistical significance was defined at p<0.05.
  
  
  RESULTS
  There were no statistically significant differences in occlusal and gingival microleakage between the groups (p=0.996 and p=0.860, respectively). In all the groups gingival margins exhibited significantly higher microleakage values compared to occlusal margins (p<0.0005).
  
  
  CONCLUSIONS
  Prophylaxis methods had no adverse effect on marginal leakage of microfilled composite resin restorations.
authors.affiliation: Dental and Periodontal Research Center, School of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran  ; Associate Professor, Department of Operative Dentistry, School of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Soodabeh
authors.initials: S
authors.lastname: Kimyai
authors.forename: Narmin
authors.initials: N
authors.lastname: Mohammadi
authors.forename: Parnian
authors.initials: P
authors.lastname: Alizadeh Oskoee
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Pournaghi-Azar
authors.forename: Mohammad Esmaeel
authors.initials: ME
authors.lastname: Ebrahimi Chaharom
authors.forename: Melina
authors.initials: M
authors.lastname: Amini