. Orthodontia, or malposition of the human teeth; its prevention and remedy . ession cups, thoseknown as flat-bottom cups should be chosen, on account ofthe better accommodation they afford for the crowns of theteeth. The cups should in all cases be large and deepenough to allow for a sufficient quantity of the materialalong the outer rim to enable a perfect impression to betaken of the labial and buccal surfaces of the teeth, and asmuch of the gum above them as possible. Figs. 11 and 12represent cups of this character with high sides, devised byDr. Angle for the taking of plaster impressions,
. Orthodontia, or malposition of the human teeth; its prevention and remedy . ession cups, thoseknown as flat-bottom cups should be chosen, on account ofthe better accommodation they afford for the crowns of theteeth. The cups should in all cases be large and deepenough to allow for a sufficient quantity of the materialalong the outer rim to enable a perfect impression to betaken of the labial and buccal surfaces of the teeth, and asmuch of the gum above them as possible. Figs. 11 and 12represent cups of this character with high sides, devised byDr. Angle for the taking of plaster impressions, but theyanswer quite as well for Modelling Compound. 66 ORTHODONTIA. A proper quantity of the composition having been softenedby dry heat or in hot water, it is placed and properly shapedin the j)reviously warmed cup and rapidly introduced intothe mouth. In taking an impression of the upper jaw the mouthshould be kept well open so that the teeth may not come incontact with the material before the proper time and thusmar the surface. When the cup with its contents has been. Figs. 11 and 12.—Angles Impression Cups for Irregularities. placed as far back as necessary, and immediately beneaththe teeth, it should be brought up into position with astraight and steady movement. Once there, it should befirmly held while a finger is introduced to force forwardinto position the portion of material that has escaped atthe rear of the cup, after, which all that portion along theouter rim should be i^ressed against the teeth and gumsfrom molar to molar. MATERIALS AND METHODS. 07 In this position it must he held until it has become sohard that a finger nail will scarcely indent it, when it shouldbe carefully removed. The hardening is best hastened by astream of cold water from a syringe, or by the renewedapplication to the cup of small sponges or napkins dippedin ice water as suggested by Prof. Newkirk. In taking an impression of the lower jaw the same generalmethod is followed, and after t
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