| 摘要 |
The protective coverage of the operative dental instruments is made from thermoshrinkable foil. Its form is the elongated elastic sleeve (1) with an elliptical cross-section before application. Its surfaces both frontal and lateral are parallel to the covered surfaces of the protected dental instrument (2). The positive dimensional tolerance 1-20% is maintained, ensuring the easiness of insertion and tight adherence of the thermoshrinkable foil to the covered surfaces, after low-intensity warming. The protective coverage secures the covered surfaces against any biological contamination, for example blood or saliva, thus protecting the patient as well as a dentist.
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