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Gingival Depigmentation by Application of Diode Laser at 810 nm (Denlase) and 470 nm (Bluelase) Wavelengths: A Split-mouth Randomised Clinical Trial
Introduction: Gingival hyperpigmentation is a common aesthetic
concern that often requires treatment to achieve a pleasing smile.
While various methods for depigmentation have been described
in the literature, the scalpel method is widely advocated. Laser
technology, particularly diode lasers, has emerged as a preferred
treatment option due to their unique properties.
Aim: To compare the efficacy of two different diode wavelengths,
namely Denlase and Bluelase lasers, in terms of pain intensity,
aesthetic appraisal, and the rate of repigmentation.
Materials and Methods: This split-mouth randomised clinical
trial was conducted in the Department of Periodontics at
Vishnu Dental College, Bhimavarm, Andhra Pradesh, India.
over a period of one year with follow-up. A total of 16 patients
were included, and the right and left quadrants (both maxilla
and mandible) were randomly assigned to either the Denlase
or Bluelase group using the coin toss method. Depigmentation
using diode lasers at 810 nm and 470 nm wavelengths was
carried out in the respective groups. Pain perception, aesthetic
appraisal, and recurrence of pigmentation were evaluated at 1,
3, 6, 9 months, and one year. The data were analysed using
Friedman’s analysis and the Mann-Whitney U-test.
Results: A total of 16 subjects, with a mean age of 27.64±7.64
years and of both genders, were included in the study. Statistically
significant differences (p=0.001) were reported in pain perception,
aesthetic appraisal, and the rate of repigmentation at 1, 3, 6,
9 months, and one year, respectively. Intergroup comparison
revealed an increase in the mean amount of repigmentation at
three months in the Denlase group, indicating a recurrence of
pigmentation after three months.
Conclusion: The Bluelase diode laser (470 nm) demonstrated
superior results compared to the Denlase diode laser (810
nm) in terms of pain intensity, aesthetic appraisal, and
repigmentation