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ePaper created 2016-04-05, 13:01:42 | version 1.38.0
25 1 2016 laser case report | Figs. 3–6: Depigmentation on upper arch using 810 nm at 30 W, 20 kHz, 16 μsec, pre-op (Fig. 3), immediate coagulation (Fig. 4), three weeks post-op (Fig. 5), eight years post-op (Fig. 6). Figs. 7: Absorption Spectra of biological materials. (Courtesy of J. Meister) during the treatment. There is no surface ablation of the pigmented mucosa but rather the haemo- globin and melanin absorbing the laser energy (Fig. 2). This technique (Figs. 3–6) showed a treatment time of two minutes compared to the ablative technique time up to 30 minutes in an 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 ances- try presented with melanin pigmentation in 2007. Congenital melanin pigmentation of the labial gin- giva 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 re- lapse of pigmentation, but the patient was satis- fied with the cosmetic appearance (Figs. 3–6). She now wanted the melanin pigment 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 emis- sion wavelength of 445 nm was used at 1 W, CW delivered through a 320 µm fiber. Procedure Depigmentation technique is the same as described with the 810 nm wavelength (above). Under local anaesthesia, a non-initiated 320 μm fiber delivers the energy at a distance of 2 mm to the pigmented area with constant movement. Fig. 5 Fig. 3 Fig. 6 Fig. 4 Fig. 7 12016