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The most common kind of oral cancer is known to be the epithelial cells cancer. The disease develops under the influence of many factors. Extensive studies confirms relationship of the occurrence of cancer in the mouth area and infection with oncogenic virus. Papilloma virus (HPV) and Ebstein-Barr (EBV) are considerate to be the most potent oncogenic viruses. Aim. The aim of the studies was to present the role of the oncogenic virus in the development of squamous cell of oral cancer. Materials and methods. Literature was carried out from November 2014 to January 2018 period using „Pub-Med”, MEDLINE, SCOPUS with keywords: squamous cell carcinoma of the Oral Cavity, oncogenic factors in squamous cell in oral carcinoma, oncogenic virus, role of Ebstein-Barr virus in the development of squamous cell of oral carcinoma, role of human papillomavirus in the development of squamous cell carcinoma. Results. To the review 16 publications were qualified that meet certain criteria for good literature. Identification of comparative characteristics was aimed at finding a common denominator of research results. Discussion. In the review the focus point was on the role of factors which is oncogenic virus. Analysis of the available data has confirmed that more and more frequent cause of commonly known factors such as tobacco smoke, alcohol, neglect hygiene, and genetic factor became undoubtedly the role of virus factor. Summary. High incidence of cancers has led to the search for relevant etiological factors in the development carcinoma process, especially in and around oral cavity. Knowledge of the most cancerogenic factors is important in order to prevent, and the search of effective treatments. In addition, the cited publications, draws attention to the fact the use of saliva as research material. This throws a new light on the work of dentists and the possibility of their involvement in the process of tumor detection and the initiating factor of oncogenesis.

Transverse maxillary hypoplasia may negatively affect respiration. Maxillary narrowing has to be treated early. An appliance for Rapid Maxillary Expansion (RME) is the most common method, and it aims to expand the skeletal base and maintain this width until a new bone has been formed to fill in the fissure. Aim. Comparison of the results of measurements of bone structures and of the upper airways on lateral teleroentgenograms of the head in patients with transverse maxillary hypoplasia and in patients with normal dimensions of the maxilla. Material and methods. The study was carried out in a group of 20 people with maxillary narrowing (10 girls and 10 boys) aged 7 to 10 years. The control group consisted of 20 lateral teleroentgenograms of patients (9 girls and 11 boys) of similar age treated for other malocclusions. The structures of the facial skeleton and the upper respiratory tract were assessed in teleroentgenograms after earlier determination of measurement points and planes according to selected parameters of the McNamara and Preston et al. methodology. The obtained results were analysed statistically using the Mann-Whitney's test. Results. Angular measurements showed statistically significantly smaller SNA and SNB angles in the study group compared to the control group. The analysis of linear measurements indicated a statistically significant larger dimension of the actual length of the midfacial segment (Co-A) and distance between the Sella point and the posterior nasal spine (PNS-S), and a smaller dimension of the posterior facial height (PFH) in the study group compared to the control group. The highest differences in upper respiratory tract measurements were noted in the Ba-ho-PNS angle, which was lower in the study group. The result was not statistically significant. Conclusions. No significant differences in cephalometric measurements of the upper airways were observed. There is a need to extend studies to include groups of patients with features of night apnoea and maxillary narrowing. (Dargiewicz E, Szarmach IJ, Sawczuk M. Assessment of the upper respiratory tract in patients eligible for treatment with transverse maxillary expansion. Orthod Forum 2018; 14: 97-105)