Manuals_files/CD Manual 12.pdf - Removable Prosthodontics
Manuals_files/CD Manual 12.pdf - Removable Prosthodontics
Manuals_files/CD Manual 12.pdf - Removable Prosthodontics
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Border Molding - 19<br />
Border Molding<br />
Border molding is the shaping of the border areas of an impression tray by functional or<br />
manual manipulation of the tissues to duplicate the contour and size of the vestibule. Border<br />
molding can be performed with thermoplastic modeling compounds, waxes or impression<br />
materials. The custom tray wax spacer remains in place during border molding procedures.<br />
Procedure for border molding with modeling compound<br />
1. Try the custom tray in the mouth - it should be comfortable and provide 2-3 mm of space<br />
to the height of the vestibule - trim with an acrylic bur if indicated<br />
2. Dry the periphery of tray (otherwise compound will not stick to the tray)<br />
3. Heat the modeling compound over a Bunsen burner until it starts to droop<br />
4. Do not overheat – if the compound catches fire or boils, it will not mold as easily, and<br />
may have to be removed to complete the border molding procedure<br />
5. Apply compound over the periphery of the tray, in a thickness just slightly narrower than<br />
the compound stick<br />
6. Flame with a hand torch until all seams or sharp contours have disappeared<br />
7. Do not burn or blister, do not melt wax spacer inside tray<br />
8. While heating, it may help to hold the tray upside down so that the softened compound<br />
droops toward, rather than away from, the depth of the vestibule<br />
9. Temper the compound in a water bath (135-140°F) for several seconds to prevent burning<br />
the patient. The hot water bath is set at a temperature that will keep the compound soft<br />
for an extended period, so it will not harden in the hot water bath<br />
10. Try to keep the wax spacer out of the hot water bath as much as possible or it will melt,<br />
and make it difficult to replace the tray intraorally in the same position between intraoral<br />
insertions. This will result in uneven border molding.<br />
11. The patient should be seated with head against the headrest, with mouth open and relaxed<br />
prior to removal from the hot water bath. When the patient ‘opens wide”, the commisures<br />
constrict, limiting access to the oral cavity and making it more difficult to place the tray<br />
12. Place the tray intraorally by rotating it into place and mold the material by pulling on the<br />
cheeks and lips and having the patient make functional movements<br />
13. Chill in cold water
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