Effect of different mouthrinses on Knoop hardness of a restorative composite.
OBJECTIVE
To evaluate the effect of mouthrinses on Knoop hardness number (KHN) of a restorative composite, at different exposure times.


METHODS
50 composite specimens (TPH Spectrum) were randomly allocated into five groups (n=10): distilled water; Listerine; Reach; Plax and Periogard. The samples were immersed daily for 14 days in 20 ml of the respective solution for 2 minutes twice a day (with a 12-hour interval between exposures). Measurements were carried out at four different times: 1 hour after sample preparation, 1, 7 and 14 days after the first immersion in the solutions.


RESULTS
Statistical analyses (Repeated Measures ANOVA and Tukey test at 0.05 significance level) showed significant differences among KHN of t wo experimental groups (mean values): Listerine (49.17) and Plax (51.14). There was n ointeraction between products and time, although the highest means were registered 24 hours after the first immersion for all tested groups.
Cavalcanti
Andrea Nóbrega
AN
Department of Restorative Dentistry, Piracicaba School of Dentistry, UNICAMP, SP, Brazil.
Mitsui
Fabio Hiroyuki Ogata
FH
Ambrosano
Glaucia Maria Bovi
GM
Mathias
Paula
P
Marchi
Gisell Maria
GM
D000180:Acrylic Resins / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D006244:Hardness / Q000187:drug effects; D006245:Hardness Tests / Q000379:methods; D009067:Mouthwashes / Q000494:pharmacology*; D011140:Polyurethanes / Q000737:chemistry*; D013997:Time Factors
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D009067:Mouthwashes; D011140:Polyurethanes