| 摘要 |
The invention relates to a rubber dam for the isolation of one or more teeth in a patient's mouth, which comprises an annular perioral frame (2) to be arranged extraorally, an elastic and film-like covering means (1) which can be connected to the frame (2) and which in the untensioned state has a bag-shaped section (3) for insertion into the oral cavity, and a fastening means (6) for the intraoral fastening of the covering means (1). The fastening means (6) is formed by an elastic annular element (6) which can be inserted into the vestibule (8) in an elastically deformed state and then exerts a force on the covering means (1) which pushes the covering means (1) into the vestibule (8) and firmly retains it therein. When the rubber dam is inserted, the covering means (1) extends in a slightly tensioned state between the frame (2) and the fastening means (6) located in the vestibule (8) around the corners of the mouth and the lips (7) and intraorally in the upper jaw and in the lower jaw in a slightly tensioned state out of the vestibule (8), over the front sides of the teeth and in the palate and tongue area in the plane of the chewing surfaces, and pushes the lips, the corners of the mouth and the cheeks away from the teeth as well as the jaws apart and assists the opening of the mouth in this manner.
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