The buccal mucosa is located between the superior and the inferior vestibular sulcus and stretches from the labial commissures in anterior direction to the frontal palatal arch in posterior direction. Usually, in the area opposite the maxillary second molar, the opening of the parotis duct is visible and shows a minor elevation of the mucosa. The sulcus extends from the mucogingival junction to 1cm of the deepest point of the sulcus into the area of the buccal mucosa. The mucous membrane is either parakeratotic or nonkeratinized.
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