Australian Dental Council (ADC) Test 2026 – 400 Free Practice Questions to Pass the Exam

When preparing custom trays for elastomeric impressions, the use of adhesive is favored over perforation because it creates a strong bond between the tray material and the impression material, which enhances retention. Adhesive can be applied to the entire surface of the tray, ensuring a uniform layer that effectively holds the impression material in place during the impression-taking process. This method minimizes the risk of air entrapment and ensures that the impression material is not displaced, leading to more accurate impressions.

In contrast, perforations in custom trays may create areas where the impression material can escape, potentially compromising the stability and accuracy of the impression. Although some practitioners may still use perforations for retention purposes, adhesive tends to provide a more reliable and consistent method for securing the material.

Furthermore, the timing of applying the adhesive is also crucial; it is ideally applied directly before the procedure to maintain its effectiveness and ensure it adheres properly to both the tray and the impression material. Overall, using adhesive simplifies the process and often yields better outcomes when working with elastomeric materials.