The dental arches can be divided into four equal sections which begins at the midline of each and extends towards the back teeth; full mouth would indicate that work was completed in all four sections
L
Left
Refers to the teeth on the left side, both top and bottom
LA
Lower Arch
Refers to the bottom teeth, both the left side and the right side
LL
Lower Left
Refers to the teeth on the bottom left side
LR
Lower Right
Refers to the teeth on the bottom right side
R
Right
Refers to the teeth on the right side both top and bottom
UA
Upper Arch
Refers to the top teeth, both the left and the right side