Whether two FDI tooth numbers are arch-adjacent (same-arch consecutive positions, including the 11/21 and 41/31 midline pairs). Exported for tests / potential reuse; the derivation itself only needs the local archAdjacent above.
archAdjacent
Whether two FDI tooth numbers are arch-adjacent (same-arch consecutive positions, including the 11/21 and 41/31 midline pairs). Exported for tests / potential reuse; the derivation itself only needs the local
archAdjacentabove.