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Abstract

EFFECT OF CO2 LASER ON PERI-IMPLANT INFECTIONS

Bayda'a F. Hamzah*, Eman N. Najee, Banaz J. Ali., Ban K. Hassan, Tiba A.Salman

ABSTRACT

The purpose of this study was to assess the bactericidal effect of CO2 laser 10,600 nm on (S. oralis, S. aureus and S. epidermis ) causing peri-mucositis and peri-implantitis. Five pure bacterial isolates including, isolate for Streptococcus oralis, two isolates for Staphylococcus aureus and two for Staphylococcus epidermis were chosen out of 25 samples according to antibiotic sensitivity test to perform this study. Bacterial suspension (10-6 CFU/ml) was prepared by serial dilution method of each isolate then 100μl of each suspension was spread over agar plates before irradiation for the control groups and 100μl of each bacteria suspension was spread over agar plates after being irradiated with 10,600 nm CO2 laser, CW mode emission using different power densities 500 -3000W/cm2 (500 W/cm2 increment) with different exposure times 10-60sec. (10sec. increment for isolating of Streptococcus oralis) and 5-30sec. (5 sec. increment for isolates of Staphylococcus aureus and Staphylococcus epidermis). All the plates were incubated at 37ºC for 24-48 hours. The colony forming units (CFUs) was counted and compared with the control group then the bactericidal effect of CO2 laser was assessed in relation to the colony forming units of the control group.The maximum bactericidal effect of CO2 laser on S. oralis was 100% at 2500W/cm2 with exposure times 50 and 60sec. , while the CO2 laser killed 100% of resistant S. aureus and S. epidermis to antibiotic test of 3000W/cm2 at 25 sec. for S. aureus whereas 2500W/cm2 at 30 sec. for S. epidermis. However, with regard to the sensitive isolates the maximum effect of CO2 laser on S. aureus was found at 2000W/cm2 with all exposure times (5-25 sec.) while S. epidermis was appeared at 2000W/cm2 when exposure time 20 second. The results revealed that irradiation by CO2 laser CW mode emission may be useful in reducing the bacterial counts almost completely at low and completely at high power densities.

Keywords: CO2 laser irradiation, bactericidal effect, Peri-implant infection.


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