Table 2.
The log colony-forming units per ml from four groups (logXG ± SD)
| Bacteria | class I cavities of amalgam (n = 21) |
class II cavities of amalgam (n = 21) |
class I cavities of composite resin (n = 13) |
class II cavities of composite resin (n = 13) |
|---|---|---|---|---|
| Total aerobic bacteria | 5.43 ± 0.35 | 5.45 ± 0.51 | 5.35 ± 0.76 | 5.41 ± 0.52 |
| Total streptococci | 5.25 ± 0.72 | 5.15 ± 0.45 | 5.16 ± 0.65 | 5.24 ± 0.98 |
| S. mutans | 4.99 ± 0.56 | 4.94 ± 0.89 | 4.85 ± 1.08 | 4.95 ± 1.12 |
| Actinomyces | 4.25 ± 1.14 | 4.24 ± 0.84 | 4.16 ± 0.37 | 4.27 ± 1.22 |
| Lactobacilli | 5.06 ± 0.60 | 5.12 ± 0.71 | 4.90 ± 1.17 | 5.07 ± 0.62 |
| Neisseriae | 4.92 ± 0.87 | 4.93 ± 0.88 | 4.74 ± 0.46 | 4.85 ± 0.92 |
| Total anaerobic bacteria | 5.91 ± 0.47 | 5.68 ± 0.79 | 5.58 ± 0.94 | 5.64 ± 0.81 |
| Prevotella | 5.31 ± 1.55 | 5.25 ± 1.72 | 5.33 ± 1.11 | 5.29 ± 0.72 |
| No-melaninogenicus | ||||
| Prevotella melaninogenicus | 5.21 ± 2.15 | 5.19 ± 1.48 | 5.11 ± 1.63 | 5.17 ± 2.24 |
| Porphyromonas | 4.25 ± 1.06 | 4.22 ± 1.00 | 4.15 ± 1.89 | 4.21 ± 0.98 |
| Veillonella | 5.33 ± 0.64 | 5.34 ± 0.82 | 5.29 ± 1.28 | 5.32 ± 1.15 |
| Fusobacterium | 4.02 ± 0.59 | 4.12 ± 0.55 | 4.32 ± 0.88 | 4.17 ± 1.01 |
| Peptostreptococcus | 4.41 ± 0.47 | 4.59 ± 0.95 | 4.50 ± 0.75 | 4.35 ± 1.76 |
| Capnocytophagas | 0.44 ± 1.46 | 0.41 ± 1.92 | 0.33 ± 1.76 | 0.37 ± 1.53 |
Bacteria colony-forming units were presented as log colony-forming units per ml. The composition of the microbe involved in secondary caries was analyzed using SPSS11.5 software. Log colony-forming units per ml were compared by two-way ANOVA analysis using the Bonferroni method. For each type of bacterium, no significant difference was found among four groups (P > 0.05), but the mean of Log colony-forming units for the detected bacteria showed statistical difference among the detected bacteria within each group (P < 0.05).