Effect of finishing method on the microleakage of Class V resin composite restorations.
OBJECTIVE
To evaluate the effect of three finishing methods on the microleakage of Class V hybrid resin composite.


METHODS
Facial and lingual Class V cavities were prepared at the cemento-enamel junction of bovine incisors. Restorations of the two materials (Z100; Prodigy) were placed, using the supplied dentin-adhesives (Scotchbond Multipurpose; OptiBond FL, respectively). Finishing methods were carbide (C) and diamond (D) finishing instruments operated at high-speed, and finishing disks (S). After thermal cycling, the teeth were immersed in methylene blue dye, then sections of the restored teeth (n = 12) were visually assessed for leakage.


RESULTS
No leakage was observed at the resin-enamel interface in any restoration. At gingival margins, the incidence of leakage (slight/severe) was: Z100 D = 4/3, C = 5/3, S = 2/0; Prodigy D = 3/0, C = 2/4, S = 3/2. The greatest incidence of leakage was observed in restorations finished with carbide finishing burs. A two-way ANOVA of leakage data rankings showed no significant difference among the three methods (P = 0.07) or between the two materials (P = 0.55), and no significant interaction of material and finishing method (P = 0.07).
Brackett
W W
WW
Dept. of General Dentistry, University of Tennessee-Memphis, College of Dentistry 38163, USA. brackett@dental.utmem.edu
Gilpatrick
R O
RO
Gunnin
T D
TD
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000627:therapeutic use*; D003731:Dental Caries / Q000628:therapy; D003763:Dental Leakage / Q000209:etiology*; D018772:Dental Marginal Adaptation; D003775:Dental Polishing / Q000009:adverse effects* / Q000295:instrumentation / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000145:classification; D066298:In Vitro Techniques; D007180:Incisor; D008422:Materials Testing / Q000706:statistics & numerical data; D012822:Silicon Dioxide / Q000627:therapeutic use*; D015040:Zirconium / Q000627:therapeutic use*
D003188:Composite Resins; C099128:Prodigy; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium