After inserting the center pin (part #5) in the mandibular tray, set the center pin to the
highest point before measuring the vertical dimension. Make sure posterior parts are
detached and insert both anterior parts of mandibular and maxillary trays
(parts #1 & #3) in patient's mouth.
Then, lower the center pin (part #5) until patient's lips naturally touch each other without
the lips having any tension. If necessary, you may cut the center pin in half to shorten the
pin. If the patient has an existing denture, determine the vertical dimension by adjusting the
center pin (part #5) to match the pre-determined vertical dimension.
For the patient's comfort, trim the excess pin thread out of the pin hole before taking the
centric relation record. After you get the vertical dimension, determine the centric relation
location by having the patient move his/her jaw front and back several times to figure out
the most posterior position.
After you determine the centric relation position, fill up the gap with bite registration
material on both sides as well as on the front.
After the bite registration material is set, remove the entire piece from a patient's mouth.