Which of the following statements is true regarding impression tray seating?

Seating the posterior teeth first when taking impressions is important for ensuring a stable and accurate fit within the impression tray. The posterior teeth provide support and help establish a proper seal, which is crucial in capturing a complete and precise representation of the arches. This method minimizes the risk of air entrapment and displacement during the impression process.

When the posterior teeth are seated first, it allows the tray to adapt well to the contours of the arch, and then the anterior segment can follow, helping to create a uniform impression that encompasses both the posterior and anterior areas effectively. This sequence is particularly valuable in managing patient comfort and allowing for better control of the impression material during the procedure.

In contrast, the other statements suggest alternative seating sequences that would not provide the same stability or accuracy in capturing the impression, emphasizing the significance of proper technique in achieving optimal results in dental procedures.