Abstract
Abstract Biometric impression trays are designed to support the lips and cheeks in their pre-extraction positions. The tray design is based on the average buccolingual breadth measurements of the dentulous alveolar process. The transference of these measurements is possible as the remnants of the lingual gingival margins can be identified on edentulous casts. The method of making the trays is described. The advantages of biometric impression trays are such that over the past five years they have replaced conventional impression trays for complete denture work in Edinburgh.
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