Which impression is taken with a rubber base material by the dentist?

Which impression is taken with a rubber base material by the dentist?

• A. Final Impression
• B. Preliminary Impression
• C. Impression
• D. Model

Answer: (A)

Elastomeric (rubber base) impression materials are chosen for final impressions because they give the most accurate detail and are dimensionally stable after removal. They reproduce tooth margins and surrounding tissues with high precision, have good tear resistance, and can be poured multiple times to produce precise dies for fabrication of crowns, bridges, or implants. For preliminary impressions, simpler materials like alginate or impression compounds are typically used—they’re faster and cheaper but not as dimensionally stable or detailed, so they’re not suited for final restorations. That’s why a rubber base impression is the one taken for final impressions.

Elastomeric (rubber base) impression materials are chosen for final impressions because they give the most accurate detail and are dimensionally stable after removal. They reproduce tooth margins and surrounding tissues with high precision, have good tear resistance, and can be poured multiple times to produce precise dies for fabrication of crowns, bridges, or implants. For preliminary impressions, simpler materials like alginate or impression compounds are typically used—they’re faster and cheaper but not as dimensionally stable or detailed, so they’re not suited for final restorations. That’s why a rubber base impression is the one taken for final impressions.