b. Features on the upper crown surface (within or on the outline and excluding the tooth base or scale base/pedicle) ^{2, 19, 31, 32}

0.

indeterminate

1.

none of the following ^{2, 8, 9, 19, 31}

2.

parallel or subparallel lines, ridges, and (or) keels; which if they radiate, radiate from an edge or from a point on the margin ^{2, 8, 9, 19, 31}

3.

lines or ridges radiating from approximate centre of crown ^{2, 8, 9, 19, 31}

4.

in an elliptical or subcircular form, one single or double, straight or arcuate line or ridge across greatest dimension ^{2, 8, 9, 19}

5.

in triangular forms, a transverse line (the transverse line is the nearest line to the base that extends at least from one side of the inline to the other; and may extend to one or both outline margins); frequently the transverse line separates the tooth crown from the tooth base ^{2, 8, 9, 19}

6.

a distinct curved or undulating line or ridge approximately parallel to a curved, undulating or dentate edge ^{2, 8, 9, 19, 31}

7.

one median line, ridge, or keel ^{2, 8, 9, 19, 32}

8.

in triangular forms, a flanged occlusal crest that forms a cutting edge on two margins of tooth; it extends from tooth crown apex to its base on both margins ³²

9.

concentric lines ^{9, 19}

10.

pores, pitted, stippled or nodular surface, or central depression ^{19, 22, 32}

11.

granular surface ³¹

12.

short or long irregular lines or ridges, may bifurcate basally ³²

13.

scalloped texture ³²