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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).