ABSTRACT
Bleaching treatments may alter the color stability of composite restorations. Silorane-based composites have shown similar or superior physical and mechanical properties compared to other types of composites. Furthermore, studies have shown variable and sometimes contradictory results regarding the effect of bleaching agents on the color stability of composite restorations. This study aimed to assess the effect of two Iranian bleaching agents on color stability of a Silorane-based [P90] composite compared with two methacrylate-based composites [nanofiller[Z350] and microhybrid. [Z250]. In this in vitro study, a total of 18 disc-shaped specimens [10 x 2 mm] of Z250, Z350 and P90 composites [A3 shade] were fabricated and randomly divided into 3 groups [n=6] and subjected to bleaching treatment with 16 % carbamide peroxide, 35% carbamide peroxide and distilled water as the control group. Color parameters were measured using CIE-L*a*b* system and a spectrophotometer before and after bleaching. The factors were statistically analyzed by means of two-sided ANOVA [repeated measures ANOVA] and Tukey's multiple comparisons tests.The mean +/- standard deviation of total color change [delta E] in control, 16% carbamide peroxide and 35% carbamide peroxide groups was 3.48 +/- 1.43,4.55 +/- 1.7 and 4.17 +/- 1.9, for Z250, 4.33 +/- 2.41, 4.94 +/- 2.23 and 4.25 +/- 1.65, for Z350 and 4.97 +/- 2.47, 5.28 +/- 1.67 and 3.4U2.26 for P90, respectively. delta E was clinically perceptible after bleaching treatments of all composite materials [delta E>3.3]
ABSTRACT
Based on the attraction of the world society to traditional treatment and the importance of drug extraction of natural material and plants, in this in vitro study the effect of hydroalcoholic extract of Salvia officinalis and Carum copticum which are very useful in the traditional treatment of mouth and teeth disease have been determined against cariogenic bacteria. In this experimental study, hydroalcoholic extracts have been prepared after sterilization of the extracts by special filter from Salvia officinalis and Carum copticum using the maceration method [serial dilution of the sample by the method]. Their antibacterial activity against Streptococcus mutans, Lactobacillus rhamnosus and Actinomyces viscosus have been evaluated by the broth macrodilution method. Results have been analyzed with Mann-Whitney test. MIC [Minimum Inhibitory Concentration] of Salvia officinalis and Carum copticum for Streptococcus mutans were 6.25 and 12.5 micro gram per milliliter, respectively, These figures were 1.56 and 6.25 micro gram per milliliter for Lactobacillus rhamnosus and 12.5 and 25 micro gram per milliliter for Actinomyces viscosus. Both extracts had inhibitory effects on growth in all three bacterial species. Salvia officinalis had a greater effect on inhibition of growth in all three bacterial species. Salvia officinalis also had a bactericidal effect in the range of concentration
ABSTRACT
There is an increasing global tendency to use traditional medicines and drug-extracts from natural plant materials. This in-vitro study was conducted in order to evaluate the cariostatic effect of hydroalcoholic extract of Salvia officinalis and Achillea millefolium. In this experimental study, hydroalcoholic extracts were prepared from Salvia officinalis and Achillea millefolium using maceration method. The antibacterial activity of these two extracts against Streptococcus mutans, Lactobacillus rhamnosus, and Actinomyces viscosus were evaluated through broth macrodilution method. Data was analyzed with Mann-Whitney test. The Minimum Inhibitory Concentration [MIC] of Salvia officinalis and Achillea millefolium for streptococcus mutans were 6.25 and 50 micro gram per milli liter, respectively. The corresponding figures for Lactobacillus rhamnosus were 1.56 and 12.5 micro gram per milli liter; and for Actinomyces viscosus the value were 12.5 and 50 micro gram per milli liter, respectively. The differences between the two extracts were statistically significant. Both extracts had growth inhibitory effect on all three bacteria. Salvia officinalis showed greater inhibitory effect on growth of all three bacteria. Both extracts had bactericidal effect in the considered concentration range