Inclusion Criteria:  Adult male or female (age ≥18 years), Patient requiring a dental restoration with subgingival margins on one or more teeth with placement of a single or multiple fixed prosthesis. Partially edentulous patients can be enrolled. Good oral hygiene Healthy periodontium and gingiva: probing depth ≤3 mm, no evidence of gingival inflammation (gingival index ≤ 1), attachment loss (attached gingival >2 mm), bleeding on probing, or plaque accumulation (plaque index < 3) Patient who received information and gave written consent. Patient affiliated with a social security/protection plan.  Exclusion Criteria:  Contraindication to taking impression evidenced at the latest on the day of inclusion visit (gingival index ≥2, sign of attachment loss or tooth mobility, probing depth >3 mm). Known allergy to aluminum, aluminum salts or to one of the compounds of the formula of the gingival retraction material, or to one of the compounds of the impression material. Patient with an unbalanced systemic disease (diabetes, thyroid disorders, history of oropharyngeal cancer), Simultaneous participation in another interventional clinical investigation or trial, Vulnerable Subjects