Le cosmos dentaire . entre des filières d'acier alternatif sous pression veryGreat, et ses molécules sont si condensées qu'il est presque astiff comme acier trempé, alors que le goujon qui est cuit dans le canbe de porcelaine plié avec le pouce et le doigt. Cette couronne ne fait pas appel au raisonnement mymécanique comme étant assez fort pour résister à une straincomme celle requise de lui dans l'utilisation réelle dans la bouche. J'ai vu, dans ma pratique, probablement vingt-cinq couronnes ayant la goupille bakedinto eux où la broche s'était étirée et la couronne était projection.Il y a assez de matière dans la plupart de ces chevilles pour être très s

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The Dental cosmos . ing between reciprocating steel dies under verygreat pressure, and its molecules are so condensed that it is almost asstiff as tempered steel, while the dowel that is baked into porcelain canbe bent with the thumb and finger. That crown does not appeal to mymechanical reasoning as being strong enough to withstand a strainlike that required of it in actual use in the mouth. I have seen, in my practice, probably twenty-five crowns having the pin bakedinto them where the pin had stretched and the crown was projecting.There is material enough in most of these dowels to be very strong, but it is so thoroughly annealed that it stretches very easily. I canreadily bend one of these dowels with my fingers in any direction, asyou see. In this crown I use no gold whatever, and require neither blow-pipe, soldering, nor investments. Just notice what I have left out ofthe ordinary crown operation. I have not prepared this root aroundthe edge for a band, I have fitted no band to it, and I have not had. FIRST DISTRICT DENTAL SOCIETY, STATE OF NEW YORK. 131 to wait for the investment to harden, dry out, heat up, and cool off.Again, the copper amalgam over the end of the root forms a cap, andby fitting into the groove forms a ferrule, also, and I claim it is anabsolute preventive against decay of that root while that copper amal-gam cap is retained. You may say that it will turn dark, but copperamalgam that is not on exposed surfaces will not turn black, butmore of a steel-gray. Now, a crown is no stronger than its weakest point. All porcelainwhen baked upon platinum dowels or pins has checks in it, which canbe seen under the microscope or with the naked eye, and the teethsometimes break at those points ; but a crowrn which is baked arounda hole has no checks. Very rarely have we seen an old-fashionedpivot tooth broken in two. This form of crown I have used forseveral years without having one broken or checked. I have put itin the most exposed places. In one case I

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