Figure 4. Distal view of GSP 11003 (left) and GSP 17121 (right). Note the sharp, unworn distal ridge of GSP 17121 compared to the elongate distal wear facet on GSP 11003 (see also Figure 3). Figure 1 shows that there is also no wear on the lingual margin of the distal ridge of GSP 17121. The broad mesial wear facet of GSP 17121 (Figure 2) demonstrates that the tooth had been in occlusion for some time.