;. "‘\,, 'Kerr’s Electric Gold Annealer N this gc‘d annealer we are able to offer the profession a first-class, reliable instrument at a moderate price. It will anneal the gold evenly. It will save time. It will give far better results than are possible with either gas or alcohol flame. It will anneal the gold sufficiently in about ten minutes. Turn off the elec- tricity and it will keep the gold in even workable shape forty-five minutes or more. It is a saving and a help to good work It is the most convenient instrument that can be used to warm 11p cases of crown and bridge \\ 01k when being set with Gutta Percha. ft 13 very convenient in warming up cold instruments in winter. The operator can keep his window open without the annoyance experienced by alcohol and gas users of hav1ng the1r flame blown out. It is ornamental and thoroughly practical. It is no! intended to &e left running z‘lzzl’zyfiiz'tcly. ‘ It is made for either direct or alternating current. For Annealing gold the cover should not be put on while the Annealer is in use. Great care should be taken that it is not left running when not in use. Complete, with plug for lamp socket and connections, $12.00 THE KERR DENTAL MFG. CO., ' 9 Park Place, ' DETROIT, MICHIGAN, U. s. A. W. Kerr’s Anatomical Articulator 4 H18 Articulator is constructed along scientific as well as mechanical lines, giving each and every mechanical movement of the jaw perfectly. The actual hinge of the jaw is located on a line with the grinding surface of the molars and bicuspids and not at the condyles as is found on all other articulators. The casts should be placed on the articulator accordingly, forming a triangle of about4inches. It gives the true lateral motion of the jaw which is one of the most essential movements on an articulator. It is impossible to obtain proper articulation without this motion, for the jaw moves sideways fully an eighth of an inch. It also has an adjustable slot on either side that can be adjusted to any angle to‘ suit the curves of the jaw of the different temperaments of your patients. This adjust- ment can be made at any angle without changing the articulation and occlusion. With each articulator two extra model supports are furnished and a number of cases may be in progress on the one articulator at the same time. An adjustable nut enables the operator to replace the models on the articulator in their exact original posmons. Kerr’s Anatomical Articulator, rough nickel. with two extra set of Model Supporters, $3.50 Kerr’s Anatomical Articulator, polished and full nickel plated, two extra Model Supporters, $4.00 This articulator is mechanically constructed and carries into effect the sug-. gestions made by Dr. B. J. Cigrand, of Chicago, in his paper read before the Illi— nois State Dental Society, at Rockford, in 1901. His paper was so enthusiastically received and endorsed that we take pleasure in giving a few brief extracts from it, in order to .call attention to the ideas advanced. Prof. Cigrand, who is the head of the Prosthetic Department at the School of Dentistry, University of Illinois, said in part: “Before proceeding with the scientific results, as I have found them, I wish to call attention to the fact that the paper is intended primarily to prove that the ordinary articulator, which allows simply a ginglymoid movement/does not admit of reproducing nature and consequently causes failures. I am imbued with the idea that artificial dentures as generally constructed are decidedly abortive and do not thoroughly fulfill the purpose for which they are intended, and the time is coming when this old-time ginglymoid articulator will claim the same consideration in prosthetics that the turn-key holds in oral surgery. It will be a thing of the past and serve simlpy as a milestone in the evolution of dentistry. * * * -* “The lower jaw during the process of mastication forms somewhat of a triangle while opening and closing. When the jaw is opened it falls backward and .downward, and in closing it moves sligthly forward and then upward. Now, if the anterior tooth, goes through this movement and de- scribes such a figure all the inferior teeth being a stable part of the jaw must necessarily form a like figure. To determine what relation this movment has to the shape and movements of the jaw and condyles, I have manufactured the instruments and by their use I have arrived at many inter— esting conclusions. .~\ “The side of the lower jaw represents what I have chosen to call a lateral triangle, which is formed by a line from the condyle forward to the front teeth, then back over the plane of occlusion and thence up to the center of the condyle (AND ITS LO‘NEST POINT, IS THE PIVOTAL POINT OF THE JAWS). When this imaginary triangle is coupled with the anterior triangle they describe double triangles. Another set of triangles is formed while the jaw is in process of mastication. \Vhen the lower jaw rotates to‘ the left the right condyle moves forward and downward. while the left one simple turns on its axis. The reverse is true when the jaw is thrown in the oppo- site direction, and in consequence imaginary triangles are formed corresponding to the depth of the glenoid fossa and the length of the cusps of the teeth. This assists in determining the overbite. When the jaw cannot be freely rotated it indicates a predisposition on the part of the patient to live the life of carnivora, meatseating; while when the jaws can be readily thrown from right to left there is a disposition in the owner to be herbivorous, grain and vegetable-eating. In the former I observe that the glenoid cavity is deep and in the latter shallow. The condyle moves forward and downward until obstructed in its further tendency l)y_the eminentia articularis. and :when the condyle moves beyond this point there is dislocation. The inferior jaw can be thrown to the right, moved to the left, and thrown forward The triangle being pinioned at either right or left side, and being a perfect unit, all points must swing in the arc of the circle in proportion as they are distant from the pinioned center. If this be true—and I see no error in it—then the cusps in normal mastication must all describe small triangles. Hence, everything seems to indicate that the philosophy of mas— tication is founded on triangles and not on circles, as previously taught. \Vhen we more thoroughly understand these principles we can produce prosthetic substitutes capable of rendering service. If we continue to construct our dentures in defiance of these underlying truths, we are not only yielding abortive results, but are disgracing the divinity which enters into the work of our noble calling. * * * * “I here outline what I think indicates the various mechanical forces which the jaw can employ, and it may seem to many that my deductions do not agree with the beliefs of the past, in that we have been taught that the jaw possesses simply shear movement. The jaw being pinioned an inch to an inch and a‘half above the plane of occlusion, such a movement is impossible. * * * “There is not to-day an articulator in the market which accurately copies the movements of the jaw. Although the Bonwill and Gritman approximate the motion, they fail to register it accurately at the most important points. In the preceding pages I have given you the anatomical outline; and prnciples of the jaws, and after years of consideration have constructed an articulator which I believe is an improvement over those now used. It is briefly this: It. copies the jaw in its downward, forward and upward movements; AND ITS LATERAL MOVEMENTS AS WELL, WHICH IS THE PRIME CONSIDERATION. *_ *_ V} *g “We all recognize that in cases of dual bridges with the ordinary open-and-shut articulator we. often produce a splendid case, yet when we attach it in the mouth it requires considerable changing —-necessitating the grinding off of porcelain—facings and gold—cusps, whereas, if we possess an ARTICULATOR WHICH MIMICS THE JAVV, the cases can all be carefully adjusted before attaching them.” * * * i 9 Dr. E. J. Perry of the Chicago College of Dental Surgery, said in opening the discussion of Dr. Cigrand’s paper: “This is the most remarkable paper upon the subject of dental prosthesis that has ever been given to the profession, and Dr, Cigrand deserves the gratitude of every man present.” t 4. ns ,_ In order to bring about the mechanical results in our articulator, we have con— sulted freely with Dr. Cigrand and are satisfied that it thoroughly complements his paper in that it absolutely copies the movements of the jaw. Since havingr completed the apparatus we have received the following com- munication from Dr. B. J. Cigrand: Chicago, Oct. zrst, 1901. My Dear Mr. Kerr: “You have certainly accomplished marvelous results, and I am satisfied that all practitioners who have given this matter of ‘Philosophy of Mastication’ serious thought will agree that your GNATHOMIC MIMIC, as I would prefer to call it, will give absolutely all mechanical movements of the jaw, and I hail the day when the public will appreciate the service of teeth constructed on principles calculated to yield serviceable results.” To those who are truly interested in the subject of Dental Prosthesis, we recommend they purchase a copy of Dr. Cigrand’s new book, entitled ‘I‘The Lower Third of the Face.” It contains upwards of one hundred half-tone engravings and numbers some 150 pages. Price, $2.00. For sale by The Kerr Dental M’f’g. C0. ’ Kerr’s Universal Nerve Breach UNIVERSAL ALWAYS IN NAME RELIABLE UN IVE RSAL PATEN TED IN USE JULY 17, 1900 Menard by 1 Kerr 1311111 111g £111, Detra if: Mzch U. 5 A AS the name implies,- this breach fills all requirements for removing the nerve - and for treatingr the small nerve canal. The sharp point will follow the , smallest opening and cut ltS' way to the desired depth with Very little effort. The Cutting edges will enlarge and open out the canal and clean it thoroughly, For epening’ into an absCess through the nerve Canal this breach is unequaled, It is inValnable for boring out root fillinga It holds the cotton firmly for drying out the nerve canal or for Medication. Made in three sizes, tom‘se, 77294221711 and fine, put up ‘in a fine leather case, containing % dez. breaches, all one Size «asserted as required; Price; =1 = =1 75¢ per % dez. Kerr’s Universal Breach made Short and mounted on nurled handles, Put up % dozen in a box, Price, ‘3 -‘ =1 $1.00 er box. P THE KERR DENTAL MFG CO., 9Park Plate, DETROIT, MICHIGAN, U. S. A. A few pointers on the way to obtain the best results With KERR’S UNIVERSAL BROACH For Taking Out 'a Pulp .As 3. Root Canal Cleanser For Enlarging or Straightening Tortuous Canals For Boring Out Root Fillings ‘ For Opening into an Ab5cess through the Apex For Handling Cotton and Treating the Teeth MANUFACTURED BY THE KERR DENTAL MFG. CO.» Detroit, Michigan. Select as coarse a broach as will go into the canal, turn the broach to the right, when the apex is reached (lraw the broach out still turning slightly to the right, there is no escape, the pulp must come out with it, This broach works in a very different manner from a barbed broach. For those who prefer to use the Donaldson broach, for removing pulp, this broach is invaluable to remove the *fine fililnent at the apical end of root. The broach is especially adapted for cleansing and ren'toving debris from the canal. The fine edges ot the breach being turned back form a scraper for cleaning the walls. The broacli is so Constructed that it can be used as a drill, it is Very flexible, and with its three-cornered point, will follow a very tortuous canal, Turn the broach to the right in the canal until you feel it catch, then pull it straight out, if it does‘not come. reverse it slightly. If it is desirable to enlarge the canal. use a larger size broach and proceed as above». The broach will bore out Gutta l’ercha root fillings quicker and easier than any other instrument in use» Use the fine broach same as a drill. then if desirable to enlarge the opening, use a larger broach and proceed as before. Do not crowd the broach more than it will stand. There is little danger of its breaking unless great force is used. It is very flexible, strong, and made of the very best spring steel. Take a few. shreds of cotton betWeen the thumb and index finger of left hand, and place the broach on it and {Hess the thumb and finger firmly together, at the same time revolve the broach t0 the right with the other hand. To remove cotton from broach, use a napkin or a large piece of cotton to press the broach into and turn to the left. If not rusty, a broach that has been used some for other purposes, is best for handling cotton. For medication, use a broach a little smaller than the canal, prepare with cotton as above, then saturate with medicament and press straight into the canal, then turn the broach to the left and it will come out and leave the cotton in the canal. It is advisable to pr‘eSs the broach up after each turn to the left,‘and in that Way the cotton can be packed firmly into the canal. To remove the cotton, turn the broach to the right and into the canal, pull straight out, and the cotton will come with it. Yours very truly, THE KERR DENTAL MFG. CO., DETROIT, MICH. It. fits ‘ ~» and patient. “Dento” A New Impression. Compound HE material has many advantages over any other composition now in use: It requires very little heat and hardens quickly. It should be worked in; water that will not burn the hand. It will be stickey only when over-heated. It is improved by passing the surface over the flame just before taking an: nfipressiou. It hardens quickly and evenly. *- It has all the advantages of-‘plaster and is much more agreeablejfor operator It is put up in half pound boxes. Price, . = 1 50c per box. Manufactured and For SaIe by THE KERR DENTAL MFG. CO. Kerr’s Bite Impression Tray PATENT PENDING HIS tray will take the impression and the bite at the same time. It can be used with either plaster or modeling compound. It takes the impression in any part of the mouth, either side, upper or lower. It holds the material firmly around the parts so that a perfect impression can be taken, Price, - = - = 35 Cents. THE KERR DENTAL MFG. CO., 9 Park Place, DETROIT, MICHIGAN, U. S. A. Kerr’s Adiustable Rubber—Dam Holder NO. 2 The rubber band can be drawn tight or released from either side of the face. It is fitte’l with the Very best quality of silk elastic. It is made of German silver, full nickel plated \Vell finished. ne .v, and up- :to-date. It is made up in two styles, No. 2 and Not 3, differing only in the fastening that hole the Dam, as illustrated in the ac- companflnér cuts. ‘.PAN:NT Panomcl T holds the Dam at any ‘tention. spreading it smoothly over the ‘mouth without the use of weights. 'It has a device for adjusting the pull so that the rubber can be smoothed and the draw equalized above and below the mouth. It is reversible, both holders can be used on either side of the face. NO. 3 Price Kerr’s Adjustable Rubber Dam Holder, No. 2 or No. 3, $1.00 each. THE KERR DENTAL MFG. CO» 9 Park Place, DETROIT, MICHIGAN, U. S. A. KERR’S BLOWPIPE Somethingr new in a Blowpipe. This Blowpipe is so constructed that the ope ator does not require to be continually regulating his air and gas pressure to suit his flame. \Vith the finest needle point or heavy heating brush flame the strongest air and gas pressure can be used and the flame remains perfect. It is especially adapted for use as a A’z'z’rm/y Oxide Blowpipe for soldering up all cases where platinum solder is used. The flame is at all times under perfect control of the operator. The size of the flame is regulated by the slightest touch of the valve. No Blowpipe on the market gives a larger range of flame. It is fitted with a comfortable pistol grip. Price, = = = $3.00 KERR’S ENGINE DRILLS These drills are made after the plan of our well known Universal Broach with the exception that they are provided with a special drill point, thus giving a most rapid and clean cutting instrument for enlarging or drilling in the root canal. They clear themselves of all cuttings While drilling, and do not clog. . They are made from the toughest spring steel and can be easily sharpened. They are put up in sets in a neat wooden block where each drill has its place. A set comprises twelve drills, six in straight shank for use in canals of the anterior teeth and six for use in the right angle attachment. Price, = Each .25 Full set as per cut, - - - 3.00 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\X N/ll‘lB/UEHU IUM!{UN/III!f/lllllflilllllfll”ll/Ifill/HIIHIIIHIM(lillllllifliflfll ‘ HHS/DEHUE/HHHUX /