How can the length or depth of the alginate impression tray borders be increased?

Applying utility wax is a well-established method for increasing the length or depth of alginate impression tray borders. Utility wax can be molded and shaped to extend the borders of the tray, which ensures that the impression captures more of the anatomical features of the mouth, including the vestibular area. This technique enhances the ability of the impression to capture detailed structures and creates a more accurate representation of the patient's oral cavity, thus leading to better-fitting dental prosthetics or appliances.

Using additional alginate material is not effective for increasing the border length, as it would mainly add thickness but not extend the borders of the tray. Choosing a larger tray size could potentially accommodate more anatomical features, but it does not specifically increase the depth of an existing tray's borders. Adjusting the patient's bite would not affect the tray border's size or depth; rather, it deals with patient comfort and positioning during the impression-taking process.