. The science and practice of dental surgery. old itthere permanently ; the spring of the bow grad-ually overcomes the resistance of the tissues,and then the bow slowly regains its old position,carrying the teeth with it, that is, the teethare depressed in their sockets (see Fig. 287 (/)and {g)). It will be noticed that the positionof the ligature on the tooth must remainconstant, ai:d it is probaljle that the bowwill drag the ligature over the cingulum andneck of the tooth, rather than depress thetooth in its socket. To obviate this, the teethto be depressed are banded, and spurs directedtowa
. The science and practice of dental surgery. old itthere permanently ; the spring of the bow grad-ually overcomes the resistance of the tissues,and then the bow slowly regains its old position,carrying the teeth with it, that is, the teethare depressed in their sockets (see Fig. 287 (/)and {g)). It will be noticed that the positionof the ligature on the tooth must remainconstant, ai:d it is probaljle that the bowwill drag the ligature over the cingulum andneck of the tooth, rather than depress thetooth in its socket. To obviate this, the teethto be depressed are banded, and spurs directedtowards the incisal edge are soldered to theirlingual surfaces; as the ligature passes roundtlie tooth it is caught beneath the spur, so thatthe spring of the bow is now definitely broughtto bear on the teeth. Any tendency for themolars to be elongated nnist be combated by increasing the anchorage, which is done byputting spurred bands on the premolars andarranging that if there is any elongation of themolars it would be shared by the premolars,. -v^ Fig. 310.—A vulcanite plate and fixed attachmentson the incisors to move them laterally, those onthe right medially and those on the left distally. On the right lateral and left central are plain bandswith spurs, from which rubber bands—providingthe force to move the teeth—are stretched to thehook that passes from the plate between the leftpremolars. The right lateral will also move the right centraland the left central the left lateral. The plateis left in contact with tlio lingual surfaces of theincisors, so that they will not be moved linguallyby the pressure of the rubber bands; but theedge of the plate must present an even line sothat the teeth will pass along it. the bow engaging the spurs direct or tlirough themedium of ligatures. If it isnot necessary to have the teeth underseparate control, spurs projecting at right angles
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
