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Table 3 The comparison of detectable percentage of the microbes in the four groups.

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)

Streptococci

90.00%

86.25%

89.75%

88.89%

S. mutans

85.71

80.95

84.62

84.62

Actinomyces

41.43

38.10

43.85

49.23

Lactobacilli

68.57

67.14

68.46

60.77

Neisseriae

61.75

65.45

68.56

62.36

No-black Prevotella

80.95

71.43

73.85

90.31

Black Prevotella

56.58

51.44

50.49

53.37

Porphyromonas

20.15

22.69

19.38

24.57

Veillonella

95.24

85.71

81.54

92.31

Fusobacterium

27.62

28.57

25.38

28.46

Peptostreptococcus

38.10

28.58

38.46

30.77

Capnocytophaga

15.23

10.11

13.45

17.26

  1. The detection rate of each bacterium in each group was calculated as the percentage ratio of the number of sample which we can idenfied one kind of the bacteria from devided by the number of sample in each group. The detection rate of the bacteria involved in secondary caries was analyzed using SPSS11.5 software. For the differences of detection rate of the bacteria among the four groups, Chi-Square Test was used for analysis. There were no significant differences among the four groups for the detection rate of the detected bacterium (P > 0.05), but within each group the detection rate of each bacterium among the detected bacteria had statistical difference (P < 0.05). S. mutans, No-black Prevotella, and Veillonella were isolated from secondary caries biofilm in relatively higher percentages than Fusobacterium and Capnocytophaga (P < 0.05). There were no significant differences among the detection rate of others microbial species (P > 0.05).