Effect of organic acids in dental biofilm on microhardness of a silorane-based composite
Restorative Dentistry & Endodontics
;
: 188-194, 2015.
Article
in English
| WPRIM
| ID: wpr-20260
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 ANDMETHODS:
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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Water
/
Composite Resins
/
Biofilms
/
Acetic Acid
/
Lactic Acid
/
Immersion
Language:
English
Journal:
Restorative Dentistry & Endodontics
Year:
2015
Type:
Article
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