Maine Dental Society. THE fifty-third anniversary meeting of the Maine Dental Society will be held in the Cityhall, Portland, Me., June 26 to 28, 1918. I. E. PENDLETON, Sec'y, Lewiston, Me. New Jersey State Dental Society. THE forty-eighth annual convention of the New Jersey State Dental Society will be held on July 17, 18, and 19, 1918, on Young's Million Dollar Pier, Atlantic City, N. J. The entire convention will be held on the pier. Machinery Hall will be used for the exhibits. Those who attended last year will remember the magnificent display of dental goods, and Dr. S. I. Callahan of Woodstown, N. J., chairman of the Exhibit Committee, with 25,000 square feet of space, has promised an exhibit greater than that of 1917. The Essay Committee under the direction of Dr. C. M. F. Egel of Westfield, will present two or three essayists of prominence -names and subjects to be announced. All meetings for the presentation of papers as well as the business meetings will be held in the Greek Temple, out on the pier. The headquarters of the society will be at the pier entrance. Mail may be directed to exhibitors, clinicians, or members in care of the Secretary New Jersey State Dental Society, Young's Million Dollar Pier. A list of hotels where special rates may be secured will be published in the New Jersey Dental Journal prior to the convention, or may be secured by addressing the secretary. A cordial invitation is extended to ethical practitioners. JOHN C. FORSYTH, Sec'y, 430 E. State st., Trenton, N. J. New Jersey Board of Registration. THE State Board of Registration and Examination in Dentistry of New Jersey will hold their annual meeting and examination in the Assembly chamber, at the State-house, Trenton, N. J., on June 24, 25, 26, 27, and 28, 1918. License fee $25, re-examination $10. Applications must be filed complete ten days before the date of the examinations. Address all communications for further particulars to JOHN C. FORSYTH, Sec'y, 430 E. State st., Trenton, N. J. Maryland Board of Examiners. THE Maryland State Board of Dental Examiners will meet for examination of candidates for certificates in Baltimore, on May 30 and 31, 1918, at the Dental Department of the University of Maryland at 9 A.M. For application blanks or further information apply to F. F. DREW, Sec'y, 701 N. Howard st., Baltimore, Md. Indiana Board of Examiners. THE next meeting of the Indiana State Board of Dental Examiners will be held at the State-house, Indianapolis, June 17th to 22d inclusive. Applications and other information may be obtained by addressing H. C. MCKITTRICK, Sec'y, Indianapolis, Ind. Pennsylvania Board of Examiners. THE next examination of the Pennsylvania Board of Dental Examiners will be held in Philadelphia and Pittsburgh on Wednesday, Thursday, Friday, and Saturday, June 12th 13, 14, and 15, 1918. The examination in practical work will be in the Evans Dental Institute, 40th and Spruce sts., Philadelphia, and the University of Pittsburgh, Pittsburgh, on Wednesday, June 12th. The examination in operative work will be held at 8.30 A.M. and the prosthetic work at 1.30 P.M. Applicants are required to furnish all instruments and a patient for the operative work. The theoretical examination will be held in Musical Fund Hall, Philadelphia, and College of Pharmacy, Pride and Bluff sts., Pittsburgh, beginning at 9 A.M. on Thursday June 13th. Application papers can be secured from the department of Public Instruction, Harrisburg. ALEXANDER H. REYNOLDS, Sec'y, 4630 Chester ave., Philadelphia. Michigan Board of Examiners. THE next meeting of the Michigan State Board of Dental Examiners will be held at the Dental College, University of Michigan, Ann Arbor, Michigan, June 17 to 22 inclusive. Applications and other information may be obtained by addressing B. S. SUTHERLAND, Sec'y, North Carolina Board of Examiners. THE next meeting of the North Carolina State Board of Dental Examiners will be held at Wrightsville Beach, Wilmington, N. C., beginning promptly at 9 o'clock on Monday morning, June 17, 1918. For further information and application blanks address F. L. HUNT, Sec'y, Asheville, N. C. Mississippi Board of Examiners. THE Mississippi Board of Dental Exam- B. J. MARSHALL, Sec'y, South Carolina Board of Examiners. THE annual meeting of the South Carolina Board of Dental Examiners will be held at The Jefferson, Columbia, S. C., beginning promptly at 9 o'clock, Monday morning, June 24, 1918. All applications must be in the hands of the secretary by June 14th. Application blanks and full information may be obtained by addressing R. L. SPENCER, Sec'y, Maine Board of Examiners. All applications and fees, $20, must be in the hands of the secretary by June 21, 1918. The examination for DENTAL HYGIENISTS will be given at the same time; fee $10. WILL S. PAYSON, Sec'y, Castine, Maine. UNITED STATES PATENTS PERTAINING OR APPLICABLE TO DENTISTRY February 5. No. 1,255,541, to SIGMUND M. LAUTER. Casting machine for dental work. No. 120,463, to J. B. WILLIAMS Co. Trademark for preparations for cleaning the teeth. February 12. No. 1,256,377, to PAUL SALLES. Dental slab holder. No. 1,256,481, to MALCOLM F. EWEN. Apparatus for administering anesthetics or analgesics. February 19. No. 1.256,589, to NATHAN OPOTOW. Dentist's flask. No. 120,596, to CONVERSE W. LLOYD. Trademark for toothbrushes. February 26. No. 1,257,367, to GEORGE HENRY LELAND. No. 1,257,741, to PERCY RUSSELL AND ADOLPH No. 1,257,864, to HARRY C. HOCHSTADTER, No. 1,257,883, to HENRY H. KONE. Rotary No. 1,257,936, to PERCY RUSSELL. Dental No. 1,257,120, to EDWIN N. RICH AND WM. pression cup and matrix. Im By HERMANN PRINZ, D.D.S., M.D., Philadelphia, Pa. From the Research Laboratories of the Evans Institute, Univ. Pennsylvania. B INTRODUCTION. Y root amputation, root resection, or the more fanciful terms maxillotomy or apicoectomy, we understand the removal of more or less of the diseased root-end of a tooth and the involved periapical tissue by a surgical operation. This operation is by no means of recent origin. As early as 1871, J. S. Smith suggested it, and in 1880 Farrar described a detailed method of its application. Rhein, in 1890 and again in 1897, furnished suitable instructions regarding its technique, while Lodge in 1897 formulated the indications for its application. A systematic description of a satisfactory working method which has given most excellent results must be credited to Partsch. In 1896 and in subsequent publications he presented his operative procedures to the profession, and since then this method has been accepted as the operation of choice. During the last decade the literature on the subject has grown very voluminous, and VOL. LX.-26 merely to recall a few of the more important contributors we enumerate the names of Blum, Dunn, Federspiel, Gilmer, Ivy, Lederer, Levy, Mayrhofer, McMillan, Naumann, Riesenfeld, Sausser, Schamberg, Thoma, Weiser, Williger, and others too numerous to mention. INDICATIONS FOR THE OPERATION OF ROOT AMPUTATION. It is quite impossible to specify an absolute indication for the operation of root amputation which holds good in every case. The correct diagnosis of the prevailing conditions in each individual case is the only definite indicator for the future therapeutic (surgical or medicinal) procedure. In general terms it may be stated that the following pathologic conditions-which, incidentally, constitute the so widely discussed vicious circle generically known at present as oral focal infection-render the operation of root resection justifiable: (1) Chronic alveolar abscesses, with or without fis 381 |