The dental literature has discussed the attention to detail required when making definitive impressions of the edentulous mouth, 1-4 but many operators often do not capture all the patient's soft tissue details when making irreversible hydrocolloid impressions for preliminary or diagnostic casts. When making preliminary irreversible hydrocolloid impressions for diagnostic casts, the clinician looks to capture specific landmarks such as complete vestibular anatomy for proper clasp design and selection (for removable partial dentures) or for better visualization of the available support and undercuts (for complete dentures and implant-supported overdentures).