Journal of Indian Society of Periodontology
Journal of Indian Society of Periodontology
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Year : 2016  |  Volume : 20  |  Issue : 4  |  Page : 369-373

Effect of gallium-arsenic laser on photosensitized periodontopathic anaerobic organisms: An in vitro study

1 Department of Periodontics, Government Dental College and Hospital, Jaipur, Rajasthan, India
2 Department of Periodontics, KLES's Institute of Dental Sciences, Belgaum, Karnataka, India
3 Department of Pathology, Mahatma Gandhi Medical College and Hospital, Jaipur, Rajasthan, India
4 Department of Conservative and Endodontics, Mahatma Gandhi Dental College and Hospital, Jaipur, Rajasthan, India
5 Department of Periodontics, CSMSS Dental College, Aurangabad, Maharashtra, India
6 Department of Endodontics, Government Dental College and Hospital, Jaipur, Rajasthan, India

Correspondence Address:
Setu Mathur
1, Shanti Path, Near Triveni Crossing, Gopalpura By-Pass Road, Jaipur - 302 018, Rajasthan
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-124X.186935

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Background: The mainstay of periodontal therapy is mechanical removal of subgingival plaque. There is considerable interest in supplementing it with the use of antibiotics and antiseptics. Many drawbacks are associated with these adjunctive pharmacological regimens such as development of resistance to antibiotics and disruption of microflora of the gastrointestinal tract. Hence, alternate means of killing subgingival bacteria are clearly desirable. One such method is the use of laser. Aim: This study aimed to investigate antibacterial capabilities of gallium-arsenic (Ga-As) laser on photosensitized periodontopathic organisms. The three bacteria selected for the study were Porphyromonas gingivalis, Fusobacterium nucleatum, and Prevotella intermedia. Settings: The subjects for the study were selected from the patients visiting the Department of Periodontics, Karnataka Lingayat Education Society's Institute of Dental Sciences, Belgaum. Design: In vitro study design. Materials and Methods: Subgingival plaque samples collected from chronic periodontitis patients were cultured anaerobically for 72 h. Predetermined number of colonies of each bacterium was taken and was then divided into cases and control groups. Both groups were photosensitized using toluidine blue O (TBO) dye and the case groups were irradiated with Ga-As laser. Bacterial colonies were then serially diluted and were incubated for subculture. After incubation period, the number of viable bacterial count was performed. Statistical Analysis: Wilcoxon-signed rank test was carried out to determine significance of reduction on subsequent dilution within the bacterial group. Mann–Whitney U-test was performed to determine the significance of reduction between cases and control of particular bacterial group. Results: The results revealed substantial reduction in the viable bacterial count. F. nucleatum was found to be most sensitive to killing by laser irradiation followed by P. intermedia and then P. gingivalis. Further, the TBO dye per se did not have any significant bactericidal effect. Conclusion: Photodynamic Therapy may prove to be a promising method for eradicating periodontopathic bacteria in near future.

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