Photodynamic effects of toluidine blue on human oral keratinocytes and fibroblasts and Streptococcus sanguis evaluated in vitro.

Abstract:

BACKGROUND AND OBJECTIVE:Some oral bacteria are susceptible to killing by red light after their sensitization with toluidine blue O (TBO). The photochemotherapy of periodontal disease in vivo would require a therapeutic window where bacteria could be killed without adjacent normal tissue damage. STUDY DESIGN/MATERIALS AND METHODS:The laser-induced effects of TBO on normal human gingival keratinocytes and fibroblasts have been studied in vitro. For the assessment of viability, the CellTiter 96TM AQueous Non-Radioactive Cell Proliferation Assay was used. RESULTS:TBO was cytotoxic at low concentrations (5.0 micrograms/ml). Sensitization of keratinocytes and fibroblasts with 2 and 5.0 micrograms/ml TBO, respectively, for 5 min and exposure to light from a 7.3 mW Helium/Neon (HeNe) laser for up to 2 min (0.876J) did not reduce cell viability. However, killing of Streptococcus sanguis was achieved following exposure to HeNe light for 75 sec (0.547J) in the presence of TBO at a concentration of 2.5 micrograms/ml. CONCLUSION:The development of a system for the lethal photosensitization of bacteria responsible for periodontal disease may be possible.

journal_name

Lasers Surg Med

authors

Soukos NS,Wilson M,Burns T,Speight PM

doi

10.1002/(SICI)1096-9101(1996)18:3<253::AID-LSM6>3.

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

253-9

issue

3

eissn

0196-8092

issn

1096-9101

pii

10.1002/(SICI)1096-9101(1996)18:3<253::AID-LSM6>3.

journal_volume

18

pub_type

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