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LOCAL AND REGIONAL ANESTHESIA 283

sufficient for operations upon the dentine and even for pulp extir-
pation.
Infiltration Anesthesia is the method Avhereby anesthesia is pro-
duced by injection of the tissues about the nerve endings. The sue-

Fig. 152.—This represents a difficult case where the lingula is almost entirely wanting and
the needle has entered the sulcus too low and may yet be engaged in the tissues of the external
pterygoid muscle which it must have penetrated to reach this position.
cess of the method depends upon the thoroughness with Avhich the
tissues to be operated upon are infiltrated. If any nerve endings
are missed only partial success is obtained. The infiltration