MOUTH ULCER
\mˈa͡ʊθ ˈʌlsə], \mˈaʊθ ˈʌlsə], \m_ˈaʊ_θ ˈʌ_l_s_ə]\
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A loss of mucous substance of the mouth showing local excavation of the surface, resulting from the sloughing of inflammatory necrotic tissue. It is the result of a variety of causes, e.g., denture irritation, aphthous stomatitis (STOMATITIS, APHTHOUS); NOMA; necrotizing gingivitis (GINGIVITIS, NECROTIZING, ULCERATIVE); TOOTHBRUSHING; and various irritants. (From Jablonski, Dictionary of Dentistry, 1992, p842)
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