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Table 3 Background information concerning the use of the BacLight® assay (BLA) for assessment of (dental) biofilm vitality

From: Confusion over live/dead stainings for the detection of vital microorganisms in oral biofilms - which stain is suitable?

Studies using the BLA (n = 30)

[57, 9, 1620, 22, 23, 41, 71, 73],[82]* [83, 8598]

(a) Were plaque-like biofilms evaluated?

No: [5, 1618, 22, 23, 41, 82, 83, 86],[87, 93, 9698]

Yes: [6, 7, 9, 19, 20, 71, 73, 85],[8892, 94, 95]

(b) Validation

No: [5, 7, 9, 1618, 20, 22, 23, 41],[71, 73, 82, 8591, 9498]

Yes: [6, 19?, 83, 92, 93?]

(c) Dilution factor

Not stated: [16, 18, 23, 73, 86, 94, 95, 98]

1:1 [6, 7, 9, 17, 20, 22, 41, 71],[85, 8792, 96, 97]

2:1 [93]

4:1 [5]

6:4 [19]

1:6 [83]

(d) Incubation procedure

Not stated: [16, 18, 71, 86, 95, 96]

10 min, RT [6, 7, 20]

15 min, RT [5, 9, 17, 19, 22, 23, 41, 73],[85, 8791, 97, 98]

20 min, RT [83, 92]

>20 min, 2°C [93]

30 min [94]

(e) Comparison

No: [1618, 20, 22, 71, 82, 83, 85, 88],[90, 91, 94, 95]

Yes: [57, 9, 19, 23, 41, 73, 86, 87],[89, 92, 93, 9698]

(f) … with inappropriate methods

[6, 7, 9, 19, 23, 41, 73, 86],[87, 89, 92, 93, 9698]

(g) … with appropriate methods

[5]*

(h) Did the BLA results fit to the other parameters?

No: [7, 19, 86, 89, 92, 93] (DAPI), [96, 97]

Yes: [5, 23, 41, 93] (FDA), [98]

(i) Did the BLA results meet the expectations of the user(s)?

No: [23, 83, 86]

Yes: [5, 7, 16, 1820, 22, 41, 71, 82],[85, 8798]

  1. (a) to (i) see description in the text.
  2. Not stated: Either no information was given by the authors, or the authors stated that the staining was conducted “according to the manufacturer’s instructions”, what means generally a dilution factor of 1:1, and an incubation time of 15 minutes.
  3. *[5]: Decker registered the total bacterial counts (as log BC/ml) and the CFU (as log CFU/ml), however gave no data regarding the PE.
  4. *[82]: “cell-free” physicochemical measurements to elucidate the mechanism of the BacLight staining procedure.