Скачать или смотреть 16- Secondary impression of upper arch. Part 2: Border molding the special tray

Clinical steps:
• Instruments and materials needed for Impression registration.
• Wax knife, Scalpel with sharp blade, fire torch, water electric boiler, mixing spatula and wide glass slap.
• Green stick compound, medium rubber base, rubber base catalyst and rubber base adhesive.
• Border molding (Green compound). Sequence of tracing.
• Whatever the school you follow in tracing, you must fill the vestibule in length & width as a final result.
• Proper border molding will guarantee the peripheral seal needed to achieve the physical means of retention.
• Insert a stick of green compound into the hot water to soften it then adapt it well into the tray borders by hand.
• Adapt the compound well to the tray. It will be difficult to be separated during impression making.
• In this demo we will make the border molding for the labial and buccal flange in a one step.
• Border molding of labial and buccal flange.
• Instruct the patient to protrude his lips.
• Review border anatomy and check any short areas add new softened compound to achieve the proper extension.
• Remove the excess compound in the fitting surface of the tray to avoid pressure areas in the impression.
• Molding of posterior palatal seal area.
• Adapt the compound to posterior border by hand soften it in hot water before insertion into patient mouth.
• Instruct the patient to tilt his head down in forward, right & left directions to register all soft palatal movements.
• The ideal suction sound ensures that we have a successful work.
• Remove the excess compound from the fitting surface of the tray then scrap the connection between the compound and tray to be flushed.
• Using the scalpel blade scrape the borders of compound to reduce it in height for about 1 mm to provide a space for the impression material.
• After scrapping of compound the border molded tray is ready for the final impression wash.
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