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Papillon-Lefevre Syndrome is a rare autosomal recessive disorder. This syndrome accompanied by palmoplantar hyperkeratosis and severe periodontal destruction of primary and permanent teeth. The teeth erupt normally but due to the severe alveolar bone loss both in deciduous as well as permanent dentitions, these teeth are exfoliated within two or three years after eruptions and by the age of 15 or 17. Patients are usually edentulous. Due to periodontal disease, the dentists are often the first ones who diagnose the syndrome. A 15-year-old girl was referred to dental clinic complaining of permanent teeth mobility. All patient’s teeth except 13, 14, 17, 23, 27, 37, 43, 44 and 47 had been extracted. The third molars were impacted. Patient has advanced periodontal disease and all teeth have mobility. There was hyperkeratosis at the palms and soles. The teeth were extracted and treated with complete denture. Early diagnosis of the papillon-lefevre syndrome can help to preserve teeth. Dental treatment included extraction of all deciduous teeth, professional prophylaxis, conventional periodontal therapy, systemic antibiotics, oral retinoid, complete dentures and implants.

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Background and Objective: Gingival recession is a common disease leads to esthetic problems, increased sensitivity of teeth and root caries. This study was done to determine the prevalence of gingival recession in dental students with high level of oral hygiene.
Methods: This descriptive-analytic study was performed on 214 dental students of Golestan University of Medical Sciences, Gorgan, Iran during 2017-2018. After collecting demographic information, clinical examination including Oral Hygiene Index (OHI) and Gingival Index (GI), Severity of gingival recession, width of keratinized gingival, attachment of frenulum, toothbrush trauma, tooth malpositions, periodontal diseases and other iatrogenic factors was measured.
Results: Prevalence of gingival recession was 23.8% .Class 1 and 2 of gingival recession was 84.62 % and 15.38%, respectively. Class 3 and 4 of gingival recession did not observe in any subjects. Toothbrush trauma was the most etiologic factor in 35.4% of dental students suffering of gingival recession (P<0.05). Also, dental malposition with 20.83%, loss of keratinized gingival with 14.58%, orthodontics procedures with 12.5%, periodontal diseases with 10.4% were the other factors in gingival recession.
Conclusion: Toothbrush trauma and dental malposition are the most important etiologic factors in dentistry students suffering from gingival recession.