Page 284 - My FlipBook

Fig. 129.

Fio. 129. A blackMied spot on the mesial surface of a central incisor caused by a beginning
decay of the enanicl. which was stopped by a change of conditions, and afterward became very dark.
It shows the most common position of beginning of decay in these surfaces.
Fio. 130. An open cavity in the mesial surface of a central incisor with a superficial extension
of decay nmning away from it, toward the linguo-gingival angle of the surface. A similar superficial
whitening leads away to tlie labio-gingival angle, which was lost in Ihc high light in photographing.