References
1. Martini FH, Timmons MJ. Human Anatomy. New Jersey: Prentice Hall Publishers Company, 1995
2. Shafer WG, Hine MK, Levy BM. Text book of oral Pathology. Philadelphia: WB Saunders co; 1984; pp. 89-136
3. Unsal E, Paksoy C, Soykan E, Elhan AH, Sahin M. Oral melanin pigmentation related to smoking in a Turkish population. Community DentOralEpidemiol. 2001; 29:272–77
4. Meleti M, Vescovi P, Mooi WJ, van der Waal I. Pigmented lesions of the oral mucosa and perioral tissues: a flow-chart for the diagnosis and some recommendations for the management.Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 May;105(5):606-16.
5. Dummett CO: Oral pigmentation. First symposium of oral pigmentation. J Periodontol 1960;31:356
6. Marie-Françoise Liébart, Caroline Fouque-Deruelle, Alain Santini,François-Laurent Dillier, Virginie Monnet-Corti, Jean-Marc Glise et al . Smile Line and Periodontium Visibility. Perio 2004:Vol 1, Issue 1:17-25
7. Tal H, Landsberg J, Kozlovsky A. Cryosurgical depigmentation of the gingiva. A case report. J Clin Periodontol 1987;14:614–7.
8. Deepak P, Sunil S, Mishra R, Sheshadri P. Treatment of gingival pigmentation: a case series. Indian J Dent Res 2005;16:171–6.
9. Atsawasuwan P, Greethong K, Nimmanon V. Treatment of gingival hyperpigmentation for esthetic purposes by Nd : YAG laser: report of 4 cases. J Periodontol 2000;71:315–21.
10. Simsek Kaya G, Yapici Yavuz G, Sumbullu MA, Dayi E. A comparison of diode laser and Er : YAG lasers in the treatment of gingival melanin pigmentation. Oral Surg, Oral Med, Oral Pathol Oral Radiol 2012;113:293–9.
11. Nakamura Y, Hossain M, Hirayama K, Matsumoto K. A clinical study on the removal of gingival melanin pigmentation with the CO(2) laser. Lasers Surg Med 1999;25:140–7.
12. Mani A, Mani S, Shah S, Thorat V. Management of gingival hyperpigmen-tation using surgical blade, diamond bur and diode laser therapy: a case report. J Oral Laser Appl 2009;9:227–32.
13. Hirschfeld I, Hirschfeld L. Oral pigmentation and a method of removing it. Oral Surg Oral Med Oral Pathol 1951;4:1012–6.
14. Tamizi M, Taheri M. Treatment of severe physiologicgingival pigmentation with free gingival autograft. Quintessence Int 1996;27:555–8.
15. Novaes AB Jr, Pontes CC, Souza SL, et al. The use of acellular dermal matrix allograft for the elimination of gingival melanin pigmentation: case presentation with 2 years of follow-up. Pract Proced Aesthet Dent: PPAD 2002;14:619–23, quiz 24.
16. Perlmutter S, Tal H. Repigmentation of the gingiva following surgical injury. J Periodontol 1986;57:48–50.
17. Yi Hung Lin, , Yu Kang Tu, Chuntai Lu, Wen Chen Chung, Chiung Fang Huang, Mao Suan Huang et al . Systematic Review of Treatment Modalities for Gingival Depigmentation: A Random-Effects Poisson Regression Analysis. J Esthet Restor Dent 26:162–178, 2014.