en کودکان Pediatric Dentistry پژوهشي Research <p> Melanin hyperpigmentation is the result of melanin granules. "Black gums" may cause esthetic problems. Different treatment modalities have been used with the aim of removing pigmentations for esthetic reasons, all of which have some advantages and disadvantages. Recurrent lesions are the most important concept in all of these treatments. Cryotherapy is a method of tissue destruction by rapid freezing. It is an atraumatic, cost-effective and simple method for treating oral pigmentation. This report presents the effects of cryotherapy on physiologic pigmentations of oral mucosa in a 9-year-old boy. In this case no recurrent lesions were observed after 12 months. </p><hr><p></p><p> <strong>Source: </strong>Journal of Dental Research, Dental Clinics, Dental Prospects</p><p><a href="http://dentistry.tbzmed.ac.ir/joddd/index.php/joddd/article/view/385" target="_blank"><font color="#0000ff"> Full Text</font></a></p> Cryosurgery, depigmentation, liquid nitrogen, gingiva. 0 0 http://idai.ir/browse.php?a_code=A-10-32-1050&slc_lang=en&sid=1 Maryam Talebi talebim@mums.ac.ir 10031947532846004574 10031947532846004574 Yes Department of Pediatric Dentistry, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Niloofar Farmanbar 10031947532846004575 10031947532846004575 No Department of Pediatric Dentistry, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Salman Abolfazli 10031947532846004576 10031947532846004576 No Department of Periodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Alireza Sarraf Shirazi 10031947532846004577 10031947532846004577 No Department of Pediatric Dentistry, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran