Principles and practice of operative dentistry . fter a time theteeth become worn at this point to such an extent that they do not occlude,and an open space the form of the pipe-stem remains when the other teethare in contact. The writer once saw an elderly Irishwoman who was aconstant user of the clay pipe, in whom the groove formed between theopposing teeth at the angle of the mouth was so deep and large that shehad been of late years obliged to wind the stem of her pipe with a stripof linen to make it large enough to be gripped by the worn teeth. Abrasion from chewing tobacco is quite commo
Principles and practice of operative dentistry . fter a time theteeth become worn at this point to such an extent that they do not occlude,and an open space the form of the pipe-stem remains when the other teethare in contact. The writer once saw an elderly Irishwoman who was aconstant user of the clay pipe, in whom the groove formed between theopposing teeth at the angle of the mouth was so deep and large that shehad been of late years obliged to wind the stem of her pipe with a stripof linen to make it large enough to be gripped by the worn teeth. Abrasion from chewing tobacco is quite common among old sailors andthe negroes in the tobacco-raising districts of the South, while among thenative low-caste Hindoos and Burmese, who mix lime with their betel-nutto form a pungent quid, abrasion is very common. Tobacco and betel-nut chewers, as a rule, always chew the quid upon the same side of themouth, and as a consequence the abrasion always occurs upon that constant friction of the tobacco—which always contains more or less. 372 OPERATIVE DENTISTRY. grit, particularly so when the unprepared leaf is used, as by the negroesof the South—and of the betel-nut mixed with lime rapidly wears awaythe morsal surfaces of the teeth employed in masticating the quid. The writer has seen several cases in which the teeth had been worn tosuch an extent by this process that they did not meet by a fourth of aninch. The treatment of an abrasion is the same as that employed in erosionand attrition. OHAPTEE XXIII. DISEASES AND INJURIES OF THE DENTAL PULP AND THEIR TREATMENT. In a preceding chapter the various stages of caries were described, andin the following chapters the treatment of the superficial, progressive, anddeep-seated stages have been discussed. It now remains to take up the lastor complicated stage of the disease ; that stage in which the carious processhas penetrated so deeply into the dentin that it may have nearly or quiteexposed the pulp and produced irritati
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