Effect of organic acids in dental biofilm on microhardness of a silorane-based composite

다국어 초록 (Multilingual Abstract)

Objectives: This study evaluated the effect of lactic acid and acetic acid on the microhardness of a silorane-based composite compared to two methacrylate-based composite resins. Materials and Methods: Thirty disc-shaped specimens each were fabricated of Filtek P90, Filtek Z250 and Filtek Z350XT. After measuring of Vickers microhardness, they were randomly divided into 3 subgroups (n = 10) and immersed in lactic acid, acetic acid or distilled water. Microhardness was measured after 48 hr and 7 day of immersion. Data were analyzed using repeated measures ANOVA (p < 0.05).
The surfaces of two additional specimens were evaluated using a scanning electron microscope (SEM) before and after immersion. Results: All groups showed a reduction in microhardness after 7 day of immersion (p < 0.001). At baseline and 7 day, the microhardness of Z250 was the greatest, followed by Z350 and P90 (p < 0.001). At 48 hr, the microhardness values of Z250 and Z350 were greater than P90 (p < 0.001 for both), but those of Z250 and Z350 were not significantly different (p = 0.095).
Also, the effect of storage media on microhardness was not significant at baseline, but significant at 48 hr and after 7 day (p = 0.001 and p < 0.001, respectively). Lactic acid had the greatest effect. Conclusions: The microhardness of composites decreased after 7 day of immersion. The microhardness of P90 was lower than that of other composites. Lactic acid caused a greater reduction in microhardness compared to other solutions.

참고문헌 (Reference)

1 Wakamatsu Y, "Wear test combining simulated occlusal wear and toothbrush wear" 22 : 383-396, 2003

2 Curtis AR, "Water uptake and strength characteristics of a nanofilled resin-based composite" 36 : 186-193, 2008

3 Kalachandra S, "Water sorption and mechanical properties of light-cured proprietary composite tooth restorative materials" 13 : 105-109, 1992

4 Namiot DB, "The occurrence of Helicobacter pylori antigens in dental plaque; an association with oral health status and oral hygiene practices" 55 : 167-171, 2010

5 Stockton LW, "The effect of prolonged packing on the surface hardness of posterior composites" 27 : 266-270, 2002

6 da Silva EM, "The diffusion kinetics of a nanofilled and a midifilled resin composite immersed in distilled water, artificial saliva, and lactic acid" 15 : 393-401, 2011

7 Distler W, "The acid pattern in human dental plaque" 62 : 87-91, 1983

8 Wan Bakar W, "Susceptibility of selected tooth-coloured dental materials to damage by common erosive acids" 53 : 226-234, 2008

9 Erdemir U, "Surface hardness evaluation of different composite resin materials:influence of sports and energy drinks immersion after a short-term period" 21 : 124-131, 2013

10 Eick JD, "Stability of silorane dental monomers in aqueous systems" 34 : 405-410, 2006

11 Asmussen E, "Softening of BISGMA-based polymers by ethanol and by organic acids of plaque" 92 : 257-261, 1984

12 Weinmann W, "Siloranes in dental composites" 21 : 68-74, 2005

13 Kusgoz A, "Silorane-based composite: depth of cure, surface hardness, degree of conversion, and cervical microleakage in Class II cavities" 23 : 324-335, 2011

14 D’Alpino PH, "Methacrylate- and silorane-based composite restorations: hardness, depth of cure and interfacial gap formation as a function of the energy dose" 27 : 1162-1169, 2011

15 Silva EM, "Influence of organic acids present in the oral biofilm on the microtensile bond strength of adhesive systems to human dentin" 100 : 735-741, 2012

16 Badra VV, "Influence of different beverages on the microhardness and surface roughness of resin composites" 30 : 213-219, 2005

17 Rodrigues Junior SA, "Flexural strength and modulus of elasticity of different types of resin-based composites" 21 : 16-21, 2007

18 Yap AU, "Environmental damage and occlusal contact area wear of composite restoratives" 29 : 87-97, 2002

19 Yesilyurt C, "Effects of food-simulating liquids on the mechanical properties of a silorane-based dental composite" 28 : 362-367, 2009

20 de Moraes RR, "Effects of 6 months of aging in water on hardness and surface roughness of two microhybrid dental composites" 17 : 323-326, 2008

21 Sharafeddin F, "Effects of 35% carbamide peroxide gel on surface roughness and hardness of composite resins" 7 : 6-12, 2010

22 Kamangar SS, "Effects of 15% Carbamide peroxide and 40% hydrogen peroxide on the microhardness and color change of composite resins" 11 : 196-209, 2014

23 Honório HM, "Effect of prolonged erosive pH cycling on different restorative materials" 35 : 947-953, 2008

24 Hengtrakool C, "Effect of naturally acidic agents on microhardness and surface micromorphology of restorative materials" 5 : 89-100, 2011

25 Yap AU, "Effect of food-simulating liquids on surface characteristics of composite and polyacid-modified composite restoratives" 25 : 170-176, 2000

26 Hannig C, "Effect of bleaching on subsurface micro-hardness of composite and a polyacid modified composite" 23 : 198-203, 2007

27 Mujdeci A, "Effect of bleaching agents on the microhardness of tooth-colored restorative materials" 95 : 286-289, 2006

28 García-Godoy F, "Effect of APF Minute-Foam on the surface roughness, hardness, and micromorphology of high-viscosity glass ionomers" 70 : 19-23, 2003

29 Borgström MK, "Dental plaque mass and acid production activity of the microbiota on teeth" 108 : 412-417, 2000

30 Torres SA, "Degree of conversion and hardness of a silorane-based composite resin: effect of light-curing unit and depth" 39 : E137-E146, 2014

31 Bagis YH, "Comparing microleakage and the layering methods of siloranebased resin composite in wide Class II MOD cavities" 34 : 578-585, 2009

32 McKinney JE, "Chemical softening and wear of dental composites" 64 : 1326-1331, 1985

33 Yap AU, "Chemical degradation of composite restoratives" 28 : 1015-1021, 2001

34 Beun S, "Characterization of nanofilled compared to universal and microfilled composites" 23 : 51-59, 2007

35 Söderholm KJ, "Bergman M. Hydrolytic degradation of dental composites" 63 : 1248-1254, 1984

36 Mitra SB, "An application of nanotechnology in advanced dental materials" 134 : 1382-1390, 2003