Lazar Yessayan

Prof. Dr. Lazar Yessayan


Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 May 2019 in The Journal of Infection in Developing Countries
Verified
Journal Article
Open access
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VAVahe Azatyan
Vahe Azatyan
LYLazar Yessayan
Lazar Yessayan
MSMelanya Shmavonyan
Melanya Shmavonyan
GMGayane Melik-Andreasyan
Gayane Melik-Andreasyan
APAnush Perikhanyan
Anush Perikhanyan
KPKristina Porkshenyan
Kristina Porkshenyan
Introduction: Oral fluid cytokine levels can vary considerably during the onset of Inflammatory Periodontitis (IP) especially in people with hepatitis C virus (HCV), hepatitis B virus (HBV) and human immunodeficiency virus (HIV). Aim of our study was to evaluate levels of oral cytokines during the onset of IP among HCV, HBV and HIV negative and positive individuals in order to evaluate local immunity state during these infections. Methodology: This was a case control study with 3 groups of virally infected individuals and control group. All had IP including control group. Results: 45 patients (51.7%) had HCV, 18 (20.7%) HBV and 24 (27.6%) HIV. For IL-2 we received significant difference for all groups compared with control -2.83; HBV-31.1 (p < 0.001), HCV-25.99 (p < 0.001) and HIV-24.57 (p < 0.001). For IL-10 significant difference was observed between control -0.94 and HCV-3.63 (p = 0.027), HBV-8.38 (15.51) groups (p < 0.001). IL-4 was significantly higher in control group 14.29 compared to HCV 0.2 (p < 0.001) and HIV 0.21 (p = 0.037) group. The adjusted analysis where we consider age as possible confounder revealed that only IL-2 significantly differs for all groups compared with control group: control vs HCV (p = 0.001); control vs HBV (p = 0.024); control vs HIV (p = 0.004). Conclusions: Evidence for significant differences when comparing oral fluid cytokines of individuals with HCV, HBV and HIV with non-viral individuals was more obvious for IL-2. IL-2 levels were significantly higher in all 3 groups vs non-viral group even when age is confounder.

VAVahe Azatyan
Vahe Azatyan
LYLazar Yessayan
Lazar Yessayan
ASAelita Sargsyan
Aelita Sargsyan
AKAnna Khachatryan
Anna Khachatryan
TGTigran Ghevondyan
Tigran Ghevondyan
MMMikael Manrikyan
Mikael Manrikyan
Background: The objective was to reveal the most typical changes in oral mucosa in HCV patients and compare them with those in HCV negative patients. Methods: The study involved 96 HCV patients and 100 patients without HCV who applied to a dental clinic. The content of cytokines IL-2, IL-4, IL-10 and ɤ-INF in the oral fluid was determined by ELISA. Buccal mucosa and gums biopsies passed histological examination. An immunohistochemical study of mucous membrane biopsies was performed using monoclonal mouse antibodies to CD3+ and CD20+. Results: The HCV patients group included 96 (63.5% males), and the non-HCV group included 100 subjects (62.0% males) with lesions of the oral mucous membrane. The lesions of lips and oral mucosa were more frequent in HCV than in the non-HCV group—e.g., erosion (13.5% vs. 1%), cracks in the mouth corners (42.7% vs. 0%), changes in the oral mucosa surface (89.6% vs. 3.0%), hemorrhages (78.1% vs. 0%), etc. The pro-inflammatory IL-2 level was higher and anti-inflammatory IL-4 level was lower in HCV patients compared with those in the non-HCV group. Conclusions: Morphological changes developed in the microvasculature both worsen the tissue trophism and accelerate the healing with differentiation into coarse-fibrous connective tissue. Immunohistochemical findings indicated a decrease in local humoral immune response.

2 June 2025 in Scientific Bulletin
Verified
Journal Article
Open access
PDF file
LALarisa Avetisyan
Larisa Avetisyan
Artak HeboyanArtak Heboyan
Artak Heboyan
LYLazar Yessayan
Lazar Yessayan
MMMarina Markaryan
Marina Markaryan
Aram V. BaykovAram V. Baykov
Aram V. Baykov
LSLusine Sharimanyan
Lusine Sharimanyan
International accreditation serves as a powerful catalyst for improving educational programs in academic institutions. The purpose of this article is to present the primary assessment methods for students pursuing dental education and to outline potential changes in examination procedures within the YSMU Continuous and Integrated “Stomatology” Educational Program in preparation for accreditation, aligning them with international standards. The article discusses the fundamental principles of student assessment in dental education, highlighting key aspects such as the determination of passing thresholds, unconscious bias, potential disputes, and auditing. It presents both formative and summative assessment methods. Based on international experience and the evaluation criteria required for international accreditation, the assessment mechanisms of the YSMU Continuous and Integrated “Stomatology” Educational Program should undergo significant improvements.