What is the primary purpose of border molding in impression tray setup?

• A. To shape the border to capture tissue accurately for a precise impression.
• B. To sterilize the impression
• C. To reduce patient discomfort
• D. To adjust occlusal relationships

Answer: (B)

Shaping the border of the impression tray to capture tissue accurately is the main goal of border molding. By contouring the tray margins with molding material, you extend the borders to the depth of the sulcus and vestibule so the impression material records the soft tissues in their functional position. This creates a precise peripheral seal and prevents distortion or movement of the tray, resulting in an accurate impression of the denture-bearing tissues. Sterilization happens as a separate step after the impression is taken, not during border molding. While a well-defined border can contribute to comfort and reduce the need for later adjustments, its primary purpose is to ensure accurate border capture for a precise impression; occlusal relationships are addressed separately.