Effect of immersion time in mouthwash on the flexural strength of polyethylene fiber-reinforced composite

Fiber-reinforced composite (FRC) fixed dentures are exposed to various oral environments. One of the ways in maintaining good oral condition is by using mouthwash. Questions have been araised about the safety of prolonged use of mouthwash towards FRC. The aim of this study was to evaluate the effect of immersion time in mouthwash on the flexural strength of polyethylene FRC. The specimens used were polyethylene FRC (Construct, KerrLab, USA) and flowable composite resin (Master Flow Biodinamica, Brazil). Block shaped specimens (2x2x25 mm) was light cured (n=12). Specimens were divided into threek groups of immersion: Group 1 (without immersion); Group 2 (24 hour immersion); Group 3 (48 hour immersion). The mouthwash used was Listerine Multi-Protect (Johnson & Johnson, Indonesia) (21.6% alcohol content). Flexure strength was measured by Universal Testing Machine. The results showed the average strength value (MPa) for Group 1 was 91.318 ± 12.466, Group 2 was 62.253 ± 8.027, and Group 3 was 55.033 ± 3.373. Statistical analysis (ANOVA) showed that immersion time in mouthwash influenced the flexural strength of polyethylene FRC (p<0.05). LSD 0.05 showed there were significant differences of flexural strength between Group 1-Group 2, Group 1-Group 3 but not for Group 2-Group 3. In conclusion, the flexural strength of polyethylene FRC were decreased by the immersion time in mouthwash.

[1]  J. A. García-Manrique,et al.  Water Absorption Behaviour and Its Effect on the Mechanical Properties of Flax Fibre Reinforced Bioepoxy Composites , 2015 .

[2]  A. Parolia,et al.  A comparative effect of mouthwashes with different alcohol concentrations on surface hardness, sorption and solubility of composite resins. , 2014, Oral health and dental management.

[3]  K. Jafari,et al.  The Effect of Mouthwashes on Surface Hardness of Dental Ceramics , 2014 .

[4]  V. Greig.  Craig's restorative dental materials, 13th edition , 2012, BDJ.

[5]  R. Parkhedkar,et al.  The effect of different fiber reinforcements on flexural strength of provisional restorative resins: an in-vitro study , 2012, The journal of advanced prosthodontics.

[6]  P. Marquis,et al.  Water uptake and strength characteristics of a nanofilled resin-based composite. , 2008, Journal of dentistry.

[7]  M. Goldberg.  In vitro and in vivo studies on the toxicity of dental resin components: a review , 2008, Clinical Oral Investigations.

[8]  G. Papanastasiou,et al.  Sorption and Desorption Parameters of Water or Ethanol in Light-Cured Dental Dimethacrylate Resins , 2008 .

[9]  J. Ferracane.  Hygroscopic and hydrolytic effects in dental polymer networks. , 2006, Dental materials : official publication of the Academy of Dental Materials.

[10]  E. Asmussen,et al.  Influence of Pulse-Delay Curing on Softening of Polymer Structures , 2001, Journal of dental research.

[11]  J. Jang,et al.  Performance improvement of carbon fiber/polyethylene fiber hybrid composites , 1999 .

[12]  P. Millstein,et al.  The effect of alcoholic and nonalcoholic mouthwashes on heat-treated composite resin. , 1997, Operative dentistry.

[13]  A. Onen,et al.  In vitro effects of alcohol-containing and alcohol-free mouthrinses on microhardness of some restorative materials. , 1997, Journal of oral rehabilitation.

[14]  J. Ferracane,et al.  Fracture Toughness of Experimental Dental Composites Aged in Ethanol , 1995, Journal of dental research.

[15]  T. Chow,et al.  Polyethylene fibre reinforced poly(methylmethacrylate)--water sorption and dimensional changes during immersion. , 1993, Journal of dentistry.

[16]  M. Roberts,et al.  Influence of Water Exposure on the Tensile Strength of Composites , 1990, Journal of dental research.

[17]  J. Ferracane,et al.  Rate of elution of leachable components from composite. , 1990, Dental materials : official publication of the Academy of Dental Materials.

[18]  E. Kao.  Influence of food-simulating solvents on resin composites and glass-ionomer restorative cement. , 1989, Dental materials : official publication of the Academy of Dental Materials.

[19]  P. Mallick.  Fiber-reinforced composites : materials, manufacturing, and design , 1989 .

[20]  Wen-Li Wu,et al.  Chemical Softening and Wear of Dental Composites , 1985, Journal of dental research.

[21]  E. Asmussen.  Softening of BISGMA-based polymers by ethanol and by organic acids of plaque. , 1984, Scandinavian journal of dental research.

[22]  M. Könönen,et al.  Biomechanical Aspects and Material Properties , 2013 .

[23]  John M. Powers,et al.  Craig's Restorative Dental Materials , 2012 .

[24]  D. Sarrett,et al.  The effects of alcoholic beverages on composite wear. , 2000, Dental materials : official publication of the Academy of Dental Materials.

[25]  H. Strassler,et al.  Alcohol-containing mouthwashes: effect on composite hardness. , 1994, The Journal of clinical dentistry.

[26]  R. G. Craig.  Restorative dental materials , 1971 .