Restor Dent Endod.  2015 Aug;40(3):188-194. 10.5395/rde.2015.40.3.188.

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

• Hashemikamangar SS
• Pourhashemi SJ
• Talebi M
• Kiomarsi N
• Kharazifard MJ

• KMID: 2396461
• DOI: http://doi.org/10.5395/rde.2015.40.3.188

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.

Keyword

Dental biofilm; Methacrylate-based composite resin; Microhardness; Organic acids; Silorane-based composite resin

MeSH Terms

Acetic Acid
Biofilms*
Composite Resins
Immersion
Lactic Acid
Water
Acetic Acid
Composite Resins
Lactic Acid
Water

Figure

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  Figure 1 The SEM image of (a) Z250, before immersion; (b) Z250, after 7 days immersion in distilled water; (c) Z250, after 7 days immersion in lactic; (d) Z250, after 7 days immersion in acetic acid (arrow, pitted area).

• 

  Figure 2 The SEM image of (a) Z350, before immersion; (b) Z350, after 7 days immersion in distilled water; (c) Z350, after 7 days immersion in lactic acid; (d) Z350, after 7 days immersion in acetic acid (arrow, eroded area).

• 

  Figure 3 The SEM image of (a) P90, before immersion; (b) P90, after 7 days immersion in distilled water; (c) P90, after 7 days immersion in lactic acid; (d) P90, after 7days immersion in acetic acid (arrow, pitted area).

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