Why is proper isolation important during processing of prostheses?

• A. To speed up processing
• B. To reduce cost
• C. To prevent contaminants like saliva or oils from affecting material properties and margins
• D. To improve taste

Answer: (C)

Keeping the processing field clean and dry is essential because saliva, oils, and other contaminants can interfere with how materials cure, bond, and adhere to surfaces. When these contaminants are present, they can prevent proper polymerization, reduce surface wettability, and create voids or weak bonds, especially around margins. This leads to poorer fit, weaker joints, and increased risk of porosity or marginal gaps in the prosthesis. Maintaining isolation—keeping the field dry and clean with methods like rubber dams or dry-field techniques—helps ensure predictable material properties and accurate margins. This is not about speeding processing or cutting costs, and taste is irrelevant to the prosthesis’ performance.