Evaluation of sorption/solubility, softening, flexural strength and elastic modulus of experimental resin blends with chlorhexidine.
To evaluate physical-chemical properties of experimental diacetate chlorhexidine (CHX)-added resin blends.



Blends were formulated: G1)TEGDMA; G2)TEGDMA/0.1%CHX; G3)TEGDMA/0.2%CHX; G4)TEGDMA/UDMA; G5)TEGDMA/UDMA/0.1%CHX; G6)TEGDMA/UDMA/0.2%CHX; G7)TEGDMA/BisEMA, G8)TEGDMA/BisEMA/0.1%CHX; G9)TEGDMA/BisEMA/0.2%CHX. Icon(®) was the control group. For sorption/solubility (SS), cylindrical specimens (n=5) were prepared and their weight obtained. The specimens were immersed in deionized water for 7days at 37°C and their weight was verified again. SS were calculated using accepted formulas. For softening, cylindrical specimens (n=10) were prepared and initial Knoop hardness number (KHN) obtained. The specimens were immersed in absolute ethanol for 24h at 37°C and final KHN accomplished. Softening values were calculated by KHN reduction percentage. For elastic modulus (EM) and flexural strength (FS) bar specimens were prepared (n=10) and values obtained with a universal device (three point, 5mm distance, 0.5mm/min, load of 50N). The data was analyzed using one-way ANOVA and Tukey test (α=5%).



TEGDMA/BisEMA blends and Icon(®) showed the lowest sorption from blends (p>0.05), and Icon(®) was the most soluble material (p<0.01). TEGDMA/UDMA/0.1%CHX showed the highest softening, similar to Icon(®) (p>0.05). For EM, all blends were different than Icon(®) (p<0.01). For FS, TEGDMA blends were similar to Icon(®), showing the lowest averages (p>0.05).



Monomers chemical characteristics influenced the physical-chemical properties of experimental blends more than CHX. Between the blends tested, UDMA blends presented satisfactory results for assays evaluated.



Infiltrants CHX-added could arrest and reinforce initial caries lesions, and the antimicrobial effect could prevent new lesions in sound enamel adjacent to the infiltrated area.
Department of Pediatric Dentistry, Piracicaba Dental School, P.O. Box 52, University of Campinas - UNICAMP, 13414-903, Piracicaba, SP, Brazil.
Luciana Tiemi
LT
Inagaki
Department of Pediatric Dentistry, Piracicaba Dental School, P.O. Box 52, University of Campinas - UNICAMP, 13414-903, Piracicaba, SP, Brazil.
Vanessa Benetello
VB
Dainezi
Anhanguera University of São Paulo (UNIAN-SP), Biomaterials, Raimundo Pereira de Magalhãoes Avenue, 3305 Pirituba, 05145-200, São Paulo, SP, Brazil.
Roberta Caroline Bruschi
RC
Alonso
Department of Restorative Dentistry, Division of Dental Materials, Piracicaba Dental School, P.O. Box 52, University of Campinas - UNICAMP, 13414-903, Piracicaba, SP, Brazil.
Andréia Bolzan de
AB
Paula
Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, 875 Union Avenue, Memphis, TN 38163, USA.
Franklin
F
Garcia-Godoy
Department of Pediatric Dentistry, Piracicaba Dental School, P.O. Box 52, University of Campinas - UNICAMP, 13414-903, Piracicaba, SP, Brazil.
Regina Maria
RM
Puppin-Rontani
Department of Pediatric Dentistry, Piracicaba Dental School, P.O. Box 52, University of Campinas - UNICAMP, 13414-903, Piracicaba, SP, Brazil. Electronic address: fmpascon@fop.unicamp.br.
Fernanda Miori
FM
Pascon
D002710:Chlorhexidine; D003188:Composite Resins; D055119:Elastic Modulus; D008422:Materials Testing; D012995:Solubility
D003188:Composite Resins; D002710:Chlorhexidine
Chlorhexidine; Elastic modulus; Flexural strength; Infiltrants; Softening; Solubility; Sorption