After classification, each tooth was cut along a sagittal line
to uncover the dental pulp, which was then hydrated in sterile phosphate-buffered saline (pH 7.
The surface sculpture of glabella including the occipital ring consists of relatively large tubercles, except for three pairs of smooth muscle attachment areas; the posterior one is transversely elongated and situated just in front of S0, occupying about a third of the glabellar width; the middle is kidney-shaped and surrounds a shallow bifurcated lateral glabellar furrow situated mid way from the sagittal line
towards the axial furrow; the anterior one is nearly circular, rather small and positioned close to the axial furrow just in front of the second one; the largest tubercles occur sagittally, and a pair of glabellar spines occurs on the far anterior, close to the mid-line.
At the completion of the procedure, several lengths were measured (a: the length between the N point and the PAL; b: the length between the N and C points; x: the length between the N point and the UICL; x1: the length between the transverse lines traversing the N and I points; y: the length between the I point and the PML; y1: the length between the sagittal lines
traversing the N and I points; and t: the length between the N and I points).