Prof. Dr. Ömer Günhan finished his education in Ankara University, School of Dentistry on 1977. He gained his Ph degree in Gülhane Military Medical Academy on 1985. Later, he trained in AFIP, Washington DC in USA and studied as a researcher in Liverpool University, Department of Pathology, for one year. He become associate professor on 1989 and full professor on 1995. He become the head of the Department of Pathology in GATA between 2001-2006. He is the member of Turkish Society of Pathology, Ankara Society of Pathology, Turkish Society of Cytopathology, International Society of Oral Pathology and International Society of Cytopathology. He is working particularly on head and neck pathology, oral and maxillofaxillofacial pathology and cytopathology. He published more than two hundred international and national article. He has tree textbook of pathology, two is related with oral and maxillofacial pathology and has a section in tree pathology textbook. He retired from GATA in 2016 and is working at TOBB ETU Medical School Department of Pathology.

Dermatologic lesions of the oral mucosa.

Dermatologic lesions may involve the oral mucosa in addition to the skin. Oral findings may be the first symptoms of the disease. These are quite different from the clinical manifestations of the skin involvement which makes the diagnosis to be more difficult. Oral mucosal lesions may disrupt the quality of life due to symptoms of pain, ulceration, sensory changes and decrease of salivary flow and tooth loss as a result. In this talk, non-infectious vesiculo-bullous, lichenoid, autoimmune and hypersensitivity reactions and autoinflammatory oral mucosal lesions will be presented.

Pemphigus group disorders are chronic autoimmune diseases that target the cell-to-cell connections. The loss of intercellular adhesions leads to vesicle, bullae and loss of the epithelium that can easily be ulcerated. Lichenoid lesions include lichen planus and lichenoid drug reactions. These are common, chronic, possibly autoimmune, reticulated white or erosive mucosal diseases. Autoimmune diseases are usually accompanied by other systemic findings. Oral findings of systemic lupus erythematosus may be aggressive and requires more attention and early diagnosis. Systemic sclerosis and Sjögren's syndrome are the other common autoimmune connective tissue disorders with frequent oral mucosa and salivary gland involvements. They may cause to severe periodontal tissue damage, mucosal erosions and tooth loss.

Erythema multiforme is a self-limited, erythematous mucocutaneous disorder. A severe variant of this disorder with extensive mucocutaneous epithelial necrosis is known as Steven Johnson syndrome and toxic epidermal necrosis. These lesions are considered to be a cytotoxic immunologic reactions against to keratinocytes due to viral enfections or drugs. Contact stomatitis are hypersensitivity reactions which occur due to numerous foods, additives, and materials used in dentistry. The clinical features of contact stomatitis are localized mucosal white keratotic or erythematous areas may resemble to oral lichen planus. Behçet's disease is a multisystem aberrant inflammatory disease characterized by the presence of oral aphthosis, recurrent genital aphthae, eye lesions (uveitis) and a positive pathergy test. In some cases, recurrent, painful, severe aphthous ulceration dominates the clinical picture.

The objective of this presentation is to assess the clinical findings of oral manifestations of the above mentioned dermatologic diseases. By doing so, we enable dentists to make an early diagnosis in order to improve the quality of life of the patients who suffer from these diseases.