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ePaper created 2018-02-16, 10:54:19 | version 1.38.0
| case report laser dentistry Fig. 8 Fig. 9 Fig. 10 Fig. 11 Figs. 8–11: Depigmentation of lower arch using 445 nm at 1 W cw, pre-op (Fig. 8), immediate post-op (Fig. 9), one day post-op (Fig. 10), one day post-op laser peel between 31, 41 (Fig. 11). area of first premolar to first premolar of one dental arch. The wavelength of 445 nm is much better ab- sorbed by melanin and haemoglobin than 810 nm (Fig. 7). Hence, a much lower power density may be used to produce the same effect. Case outline A 26-year-old female patient of Chinese an- cestry presented with melanin pigmentation in 2007. Congenital melanin pigmentation of the labial gingiva was diagnosed. Depigmentation on the upper arch using 810 nm at 30 W, 20 kHz, 16 μsec was carried out. Eight years post-op showed mild relapse of pigmentation, but the Fig. 12: Three days post-op (photo taken by patient on holiday). Fig. 13: Two weeks post-op. patient was satisfied with the cosmetic appear- ance (Figs. 3–6). She now wanted the melanin pig- ment on her lower anterior segment to be removed (Fig. 8). Purpose Pigment removal in the requested sites was dis- cussed using 445 nm diode laser. The same tech- nique would be used and the patient consented to the treatment. Material and method SIROLaser Blue (Dentsply Sirona) with an emission wavelength of 445 nm was used at 1 W, cw deliv- ered through a 320 μm fiber. Fig. 12 Fig. 13 38 cosmetic dentistry 1 2017