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P. 299
Fid. l.SS.
Fio. 141.
Fios. 138-141 incliisivp. Split upper molar, showing: cavities that have begim in the central
and distal occlusal pits, which have undcrniinetl most of tlio enimel on the line of the nusio-distal
section. In this case, as shown in Figures 140. 141. the mesial and distal marginal ridges are
closely approached in removing the last traces of the decay undermining the enamel. These walls,
therefore, are not made parallel but arc sloped outward in order that there may be more strength
of dentin left. Notice also that in cutting out the disto-lingual groove. Figure 140, and the buccal
groove. Figure 141, these have been made only a little deeper than the thickness of the enamel.
In this case the jforson is of mature age and there is not the same danger of pulp exposure as in the
case represented in the series, Figures 128-137.
