| 摘要 |
Impression holder for dental and maxillofacial prostheses which does not include any element preventing complete closure of the lips and which consists of two equidistant walls which are spaced apart by approximately 1 mm, forming a space between them, and are connected on their periphery, the first wall, next to the mucous membrane, being provided over its entire surface with uniformly spaced perforations. <IMAGE>
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