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Table 2 The log colony-forming units per ml from four groups (logXG ± SD)

From: The Microfloral Analysis of Secondary Caries Biofilm around Class I and Class II Composite and Amalgam Fillings

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
  1. 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).