Importance

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Abstract

A model of a maxilla is marked with the location of the patient's lip line and with the location of the patient's ear-nose plane. Then the incisor portion of the model is shaped to have a lower edge lying on the location of the lip line. A calibration plate having a posterior ridge engaging the tuberosity portion of the model, an anterior part engaging the shaped incisor portion of the model, and sides formed with slots aligned with the molar portions of the model is then positioned on the model. The plate extends substantially parallel to the ear-nose plane from shaped front of the model. The slots are filled around the molar portions of the model with wax and a mold fork is fitted flat to the underside of the calibration plate underneath the slots with the compound adhering to the mold fork. Thereafter the fork and the compound are separated from the plate and model and are fitted to the patient. The relative angular orientation between the fork and the patient's ear-nose plane is ascertained and if the fork and plane are not substantially parallel more compound and a different calibration plate is tried, but if the fork and plane are substantially parallel another plate having the same dimensions and ridge height as the plate used with the parallel-lying fork but not formed with slot is selected from the set of calibration plates. Finally the model is ground down using the unslotted plate as a template.

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