. The teeth in health and disease . 9, which represents the teeth closed intheir natural position, the front upper teethslightly overlapping the lower. The loss ofthe back teeth, by allowing the jaws to ap-proach more closely, rapidly forces the upperteeth outward, causing them to become elon-gated and iiTegular, producing an unsightlyprotrusion of the mouth. The lower teeth are forced inwards and alsoloosen and fall out. Figs. 70 and 71 showsectional views illustrating the result of theloss of the back teeth. The teeth also act as conservators of thelungs, and organs of voice, preventing theb
. The teeth in health and disease . 9, which represents the teeth closed intheir natural position, the front upper teethslightly overlapping the lower. The loss ofthe back teeth, by allowing the jaws to ap-proach more closely, rapidly forces the upperteeth outward, causing them to become elon-gated and iiTegular, producing an unsightlyprotrusion of the mouth. The lower teeth are forced inwards and alsoloosen and fall out. Figs. 70 and 71 showsectional views illustrating the result of theloss of the back teeth. The teeth also act as conservators of thelungs, and organs of voice, preventing thebreath, in the act of speaking, from beingexhausted too rapidly. Those who have losttheir teeth find continued speaking fatiguing,as each utterance empties the mouth of air,and more rapid breathing is necessary to keepup the supply. This induces a feeling of ARTIFICIAL TEETH 153 distress and is apt to produce a chronic cough,especially dangerous in those who suffer fromweakness of the chest. The disfigurement to the personal appear-. Fig. 70. Fig. 71. Fig. 70 shows the central incisors of the upper and lowerjaws closing normally with the cutting edge of the upper toothslightly overlapping the lower. Fig. 71 shows the effect of the loss of the back teeth on theincisors. The whole force of mastication falling on the frontteeth drives the upper outwards thus permitting the jaws toapproach each other, until the lower tooth bites on the gum atthe back of the upper. ance, although the most obvious, is the leastimportant injury inflicted by the loss of theteeth, and so fully is this recognized by themedical authorities of the present day thatthe restoration of the teeth to a serviceable 154 THE TEETH condition by stopping the natural teethwhere decayed, and by replacing by artificialteeth where lost, is regarded as indispensable inthe treatment of digestive, lung and throatdiseases. The Construction of Artificial Teeth. There are several bases used for the con-struction of artificial d
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondo, bookyear1902
