What is a major risk of leaving wax patterns unattended for long periods?

Leaving wax patterns unattended for extended periods primarily increases the risk of distortion. Wax is a material that is sensitive to temperature changes and environmental factors. When left in an uncontrolled environment, it can warp or change shape due to changes in ambient temperature or humidity. This distortion can compromise the accuracy of the dental restoration process since the wax pattern serves as a mold for the final product.

In the context of dental applications, maintaining the integrity of the wax pattern is crucial for achieving the precise fit and function necessary in dental prosthetics. While cracking, poor aesthetics, and unwanted colors may be concerns in certain situations, the primary issue with prolonged exposure is the reliability of the pattern's dimensions and form, making distortion the most significant risk.