AP SPREAD


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Genieoss
The AP (Anteroposterior) spread denotes a distance measurement from the center of the two most anterior implants to the distal aspect of the two most posterior implants. The AP spread then can be multiplied by one and a half to two and a half times depending on theory and gives a guideline of how long a distal cantilever could be acceptable. The measurement is only a guideline not a set rule. Other factors have to be taken in to account. Patient age, gender and opposing dentition extent and make up play a role in the decision making process of how long a cantilever is acceptable for the specific patient situation.
1.
In case of an even number of implants draw a line "A" through the center of the two most anterior implants. See alternative for an odd number of implants at the end of this document.
2.
Draw a second line "B" through the distal aspect of the two most posterior implants.
3.
Measure the distance from line "A" to line "B". This is the AP spread.
4.
Multiply the anteroposterior spread distance by one and a half or two times depending on which theory is followed and draw a third line "C" connecting the measurement points.
5.
Alternative for an odd number of implants:
Draw a line "A" through the distal aspect of the most posterior implants and draw a second line "B" through the center of the most anterior implant, parallel to line "A". Measure the distance between tine "A" and line "B". Multiply the anteroposterior spread distance by one and a half or two times. Draw a third line "C" connecting the measurement points.