Lectures on operative dental surgery and therapeutics . e accumulatedsecretions, with its attendant train of annoyances. In adapting the rubber, it is important to accuratelycalculate the distance intervening between the teeth, inorder that corrugations formed by excess of the materialmay not encroach upon any portion of the structure in- 72 tended to be operated upon. For if the perforations be madetoo far apart, the rubber intermediate between the teethwill form convolutions and radial eminences, obstructive tothe objective point at which attention is engaged. Again,should an insufficient sp
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Lectures on operative dental surgery and therapeutics . e accumulatedsecretions, with its attendant train of annoyances. In adapting the rubber, it is important to accuratelycalculate the distance intervening between the teeth, inorder that corrugations formed by excess of the materialmay not encroach upon any portion of the structure in- 72 tended to be operated upon. For if the perforations be madetoo far apart, the rubber intermediate between the teethwill form convolutions and radial eminences, obstructive tothe objective point at which attention is engaged. Again, should an insufficient space be left between the apertures, the work will be jeopardized, or at least delayed, by theseeping in of moisture upon the filling; while if theholes be cut too small, difficuUy will be experienced inendeavouring to place it on the teeth without tearing.The other extreme, that of cutting them too large, may beconsidered quite as dangerous, for, in that case, the rubberwill fail to contract upon the teeth to an extent sufficientto exclude all moisture.. The illustration which I now pass to you shows theaverage three sizes of perflations required when usingrubber upon laterals, bicuspids, and molars, of ordinarydimensions ; exceptional cases, of course, requiring specialadaptation. For example, when placing the dam on three teeth, the central perforation being applied without tension tothe intermediate tooth, the remaining apertures will fall inthe vicinity of the proximate surfaces. The first exten-sion carries the holes to the medial points of the crown ofeach of the three teeth in question, and is made at theexpense of the rubber lying in a line with the maxilla, resulting in a proportionate elongation of the holes them-selves. 73 This extension is then supplemented by another per-pendicular to the first, which, conjoined with compressingthe rubber on the tooth, enlarges the apertures at theexpense of the elastic material (1st) on the sides embracingthe lingual and buccal aspect