INBDE (Integrated National Board Dental Examination) Practice Exam

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What is likely to happen if you produce a PMMA acrylic temp with a polymer to monomer ratio of 1:1?

Insufficient hardness
Color instability
Excessive polymerization shrinkage
Increased opacity

The correct answer is: Excessive polymerization shrinkage

When producing a PMMA acrylic temp, a polymer to monomer ratio of 11 means that the same amount of polymer and monomer is used. This results in a balanced chemical reaction and can lead to excessive polymerization shrinkage. This can cause the final product to have a poor fit and potentially cause damage to the surrounding natural teeth. Insufficient hardness, color instability, and increased opacity are not direct results of a 1:1 ratio, and therefore, are incorrect choices.