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PIT AND FISSURE CAVITIES 57
the outer ends of the rods will be found to incline more and more
aAvay from the seat of decay.
These facts should be borne in mind and a full cleavage ob-
tained.
There now remains only the usual marginal bevel and cavity
toilet.
Pit Cavities in Lingual Surfaces of Upper Incisors.
Should Receive Early Attention. These cavities should be de-
tected in their early stages as their near location to the pulp ren-
ders pulp complications an early sequence.
It is the best of practice to permanently fill all cases presented
where faults in enamel are diagnosed.
Instrumentation. Their location renders excavation hazardous.
The engine bur should be used for superficial opening only, the
most of the preparation being done w'ith hand instruments.
Outline Form. The general rules in outline form should be ob-
served. Particular note should be made of the extreme incisal in-
clination of the outer ends of the enamel rods along the margin
of the incisal wall.
Inciso-Axial Line Angle. It is generally advisable to alloAV the
incisal wall to meet the axial at quite an obtuse angle, in some
cases almost to the obliteration of this line angle, as the squaring
of this angle will greatly endanger the pulp.