| 摘要 |
A bead of a high-viscosity impression material is applied along the entire edge of an imperforate tray forming a U-shaped recess and an endless edge extending all around the recess and the tray is fitted, before the material cures, over a patient's dental arch with the bead on the edge engaging and deformed by the patient's mobile mucosa outward of the linear action boundary. The deformed bead of high-viscosity material is cured to form the tray and the cured bead of high-viscosity material into a custom tray which is then filled with a body of a low-viscosity impression material and again pressed over the patient's dental arch to press the cured bead on the tray edge into tight engagement against the mobile mucosa outward of the linear action boundary to form between the tray and the dental arch a substantially closed and generally constant-section chamber hydraulically confining the low-viscosity impression material. The confined low-viscosity material in the chamber is then compressed against the dental arch by pressing the tray toward the arch while mobilizing the mobile mucosa to hydraulically press the confined material into form-fit engagement with the stationary mucosa and tooth and without substantial leakage of the impression material from the chamber and the low-viscosity impression material is cured. Finally the custom tray with the cured low-viscosity material is stripped from the patient's jaw.
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