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The definitive account of the life and work of Horace Wells, the dentist from Hartford, Connecticut, who experimented with nitrous oxide anesthesia in 1844, is that published by W Harry Archer for the centenary of Wells's work. A major source of original material was a collection of letters, by Wells and others, that Archer found in the house in Hartford, Vermont, in which Wells was born. In later support for Wells being better recognized for his role in the introduction of general anaesthesia, Richard J Wolfe and Leonard F Menczer published a collection of essays in 1994. However, their preparation was hampered by their (mis)understanding that the 'Archer' letters (which were lodged in the Pittsburgh University Library) were "missing", a belief which continued, but has been disproved by a new author. Before his death, John Bunker encouraged his anthropologist daughter, Emily, to continue a project he had been planning on the history of anesthesia, and the result is a new book, "Horace and Elizabeth: Love and Death and Painless Dentistry". First and foremost Ms Bunker has discovered that the Archer Letters are very much available, and has been greatly helped by the University of Pittsburgh Library in producing her book. She has used reproductions and transcriptions of the letters (some previously unpublished) and other contemporary documents to illustrate Wells's role in the great discovery. Some of the material, especially from before the 'Colton' demonstration of 1844 is remarkable; it is almost like hearing the story from Wells himself., Competing Interests: Declaration of Competing Interest I was one of the contributor's to Wolfe & Menczer's I Awaken to Glory and know just how much they regretted not being able to consult the letters collected by Archer and stored in Pittsburgh. Also, I have corresponded with Ms Bunker and provided advice on historical and related matters, but played no part in the production of this new book., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

J.Y. Simpson of Edinburgh, Scotland discovered chloroform anesthesia in November 1847. During this time, W.T.G. Morton's agents had been collecting royalties for the use of ether across much of the United States. After reading about the advantages of chloroform as cited in C.T. Jackson's writings in the Boston Daily Atlas, S.F. Gladwin, a dentist in Lowell, Massachusetts, who had been reluctant to pay any ether royalties, demonstrated his independence and opportunism in swiftly adopting chloroform in his practice and publicizing its use through local advertisements., Competing Interests: Declaration of Competing Interest Neither author has any intellectual, ethical, or financial conflicts of interest., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

An Ohio dentist, Corydon Munson, patented a gasometer with an attachment for vaporizing trace amounts of volatile general anesthetics or their mixtures into unoxygenated nitrous oxide. After vaporizing a variant of George Harley's ACE mixture into nitrous oxide, Munson branded his own novel anesthetic combination as ACENO., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

Famous for pioneering the oxygenation of nitrous-oxide anesthetics, Chicago surgeon Edmund Andrews trusted the Manhattan-based Colton Dental Association's claim that they had conducted 75,000 nitrous-oxide anesthetics without a single mortality. Those statistics were cited in Andrews' 1870 journal article on anesthetic risks and then, remarkably, advertised on the business cards of dentist James M. Spencer, Jr., of Gouverneur, New York., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

Born in New Hampshire but raised in Massachusetts, 14-year-old William J.A. DeLancey became "the man of the house" after the accidental death of his father. Amiable and good humored, young DeLancey supported his widowed mother and his three sisters until the girls all reached maturity. After he married, DeLancey moved to Illinois and took up dentistry, eventually settling in Centralia. Following anesthesia training back east at Manhattan's Colton Dental Association, DeLancey returned to Centralia. There he practiced the Coltonian method of testing freshly made nitrous oxide upon himself before using the gas upon patients. Before his training at Colton Dental, DeLancey had advertised in Centralia newspapers only in prose. After he began administering laughing gas to his patients and to himself, DeLancey waxed poetic and began advertising in heroic couplets in local newspapers., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

The Chicago Post-Graduate School of Anaesthesia (PGSA) commenced with the opening of the Columbian Exposition, eight miles north of that Chicago World's Fair in May of 1893. When PGSA founder Samuel J. Hayes, D.D.S., M.S.A., forsook Chicago to tend to his moribund son back in Pittsburgh, Hayes' fellow professor, James M. Clyde, D.D.S., M.S.A., kept the PGSA from closing., Competing Interests: Declaration of Competing Interest The authors have no intellectual, ethical, or financial conflicts of interest., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

Urial K. Mayo (1816-1900) was a successful Boston dentist who was plagued by personal scandal. In 1883 he patented extending the duration of nitrous-oxide anesthesia with an alcoholic tincture of hops and poppies., (Copyright © 2020 Anesthesia History Association. Published by Elsevier Inc. All rights reserved.)

Prior to the effective use of local anesthetics to achieve profound pulpal anesthesia before extirpation, whether in the form of a nerve block or infiltration, or in some cases the use of intrapulpal injections, 1, 2 the clinician was faced with a challenge to ensure that the patient would be pain free during the procedure. In these cases the use of nitrous oxide and oxygen was common. Not so common was the use of cocaine or a solution of cocaine hydrochloride that was advocated to penetrate the dentinal tubules and create pulpal insensibility in the late 1800s. 3, 4 ., (Copyright 2018 © American Academy of the History of Dentistry.)

Phineas T. Barnum (1810-1891) and Gardner Q. Colton (1814-1898) both entered the laughing gas show business in Manhattan in 1844. With Horace Wells (1815-1848), Colton introduced inhaled nitrous oxide for dental anesthesia in December 1844. The Barnumesque nature of laughing gas exhibitions may have contributed to the initially negative reception of nitrous anesthesia as humbug. Colton continued laughing gas shows after 1844, and he performed in a Barnum forum in Boston in 1862. In 1863, Barnum encouraged Colton to establish a flourishing painless dentistry practice in Manhattan. Barnum designated himself to be the Prince of Humbug. He embraced humbug for entertainment purposes but decried medical humbug. Notwithstanding, Barnum explicitly evinced awareness of the power of the placebo response. Accordingly, the proneness of individuals to deem impersonal all-purpose assessments to be personally applicable is dubbed the Barnum effect. Barnum was indirectly connected to Painless Parker (1872-1952), a dentist who exploited sensational advertising and humbug and ran a circus., (Copyright © 2018 Elsevier Inc. All rights reserved.)

During the 19 th century, patients undergoing anesthesia for surgical and dental procedures were at risk of being given hypoxic or dilute nitrous oxide on four separate occasions. Primary and secondary saturation during surgery could account for two administrations of 100% nitrous-oxide anesthesia, while both diagnostic and therapeutic doses of dilute nitrous oxide were frequently administered in mental asylums., (Copyright © 2018 Elsevier Inc. All rights reserved.)

As popularized by Elmer McKesson, MD, "secondary saturation" with nitrous oxide could expose patients to a second burst of 100% laughing gas to relax their muscles to assist surgeons. On rare occasions, this technique could provide a second opportunity for hypoxic brain damage and possible admission postoperatively to insane asylums., (Copyright © 2018 Elsevier Inc. All rights reserved.)

Competing Interests: Disclaimer: The authors report no conflicts of interest pertaining to any of the products or companies discussed in this column. The views expressed in this column are those of the authors and do not necessarily reflect those of Vizient, Inc, Premier Dental Products Company, Creighton University School of Dentistry, or Rutgers School of Dental Medicine.

Throughout its development the practice of oral and maxillofacial surgery has been richly associated with the provision of anesthetic services. Dentists and particularly oral and maxillofacial surgeons have advanced the science associated with anesthesia especially in the outpatient setting. This article will look back on the development of anesthesia as it relates to oral and maxillofacial surgery, discuss the current mode of anesthesia in the oral surgeon's practice and look ahead to what innovations are advancing this field., (Copyright © 2018 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.)

During the latter half of the six-year long "Panic of 1873," nitrous-oxide pioneer G.Q. Colton developed, advertised, and sold his dentifrice, "Dr Colton's Vegetable Dentonic" to supplement his dental anesthetic enterprise., (Copyright © 2017. Published by Elsevier Inc.)

Introduction: History of anesthesia can be learned through formal didactic lectures, discussions, tours, audiovisual media, general anesthesia textbooks, anesthesia history texts, and by popular literature., Methods: We studied thirteen books that describe events and advances related to the discovery and development of modern anesthesia. Deliberately omitted were books that might be considered by some to be textbooks, because our aim was to explore the genre of popular literature., Results: The books span the spectrum from introductory historical narratives to comprehensive summaries, biographies, and scholarly works., Conclusions: These books provide a varied perspective on various aspects of the discovery of anesthesia, ranging from a quick read to scholarly work. If only one book were to be recommended for the novice, we suggest Julie Fenster's historical narrative, Ether Day., (Copyright © 2017 Elsevier Inc. All rights reserved.)

In 1887, American dentist Samuel J. Hayes published reports associating unoxygenated anesthetics with asphyxia and insanity, and then British psychiatrist George H. Savage published a report of cases of insanity following nitrous-oxide anesthesia in British journals., (Copyright © 2018 Elsevier Inc. All rights reserved.)

Extravagant claims were made for proprietary dental anesthetics in Boston, MA, in the late 1800s. For instance, in 1883, Urial K. Mayo introduced an inhaled Vegetable Anaesthetic comprised of nitrous oxide that had been uselessly pretreated with botanical material. This misguided concept may have been inspired by homeopathy, but it was also in line with the earlier false belief of Elton R. Smilie, Charles T. Jackson, and William T.G. Morton that sulfuric ether could volatilize opium at room temperature. In 1895, the Dental Methyl Company advertised an agent they called Methyl, a supposedly perfect topical anesthetic for painless dental extraction. The active ingredient was probably chloroform. Anesthetic humbug did not cease in Boston on Ether Day of October 16, 1846., (Copyright © 2018 Elsevier Inc. All rights reserved.)

During the 1879 Brunswick & Balke World Billiards Tournament, Manager FC Newhall had a tooth extracted under nitrous oxide administered by GQ Colton. The dental extraction occurred at the tournament site, New York City's Cooper Institute., (Copyright © 2017 Elsevier Inc. All rights reserved.)

American dentist Zacheus Rogers taught surgeon Edmund Andrews-and indirectly anesthesia pioneers SJ Hayes and FW Hewitt-to oxygenate anesthetics. Ironically, Rogers may have himself suffered neurologic damage by failing to oxygenate the nitrous oxide that he is speculated to have abused personally., (Copyright © 2017 Elsevier Inc. All rights reserved.)

The majority of dental procedures can be performed with an awake patient and the use of a local anesthetic, but when deep sedation and general anesthesia are needed, they typically are provided by those dentists with advanced training in anesthesiology, i.e., oral and maxillofacial surgeons and dentist anesthesiologists. Dental anesthesiology began with the discovery of anesthesia by a dentist in 1844 and has been recognized as a separate discipline in dentistry for nearly 70 years. Training over this time evolved from apprenticeships to one-year training programs, and in 2007, the Commission on Dental Accreditation (CODA) began accrediting two-year dental anesthesiology training programs. Since 2015, in recognition of the increasing complexity of the discipline, training has required three years of postgraduate study. The number of dentist anesthesiologists has grown with the increasing demand for anesthesia services by both the public and the profession. However, the present number of dentist anesthesiologists is not sufficient to meet the demand, so additional programs and growth in current programs are needed. Another valuable aspect of this discipline is its role as a positive example of interdepartmental collaboration since dental anesthesiology faculty, as members of a support discipline, typically work across many of the other departments in a dental school. This article reviews the history of the discipline, describes the educational goals and CODA standards for dental anesthesiology programs, using one program as an example, and discusses the needs and challenges that will shape the discipline's development in the future.

Dental disease in the form of caries and abscesses has been known since antiquity. Before the advent of anaesthesia, operations upon the mouth were painful. The introduction of general anaesthesia in the form of ether and chloroform seemed to provide a solution, but there was an unacceptable level of mortality. James Arnott introduced local anaesthesia by means of freezing with ice, which he considered safer. He waged a long campaign and his method received recognition and was used in France and the USA. His method stimulated the development of pharmacological anaesthesia.

Witness seminars attempt to get behind the scenes of advances and developments to find out what really happened at certain times; they are not intended to provide a detailed history of events. This paper presents highlights from the five John McLean Archive witness seminars, providing an instructional collection of memories and insights into the world of dentistry in the UK since the late 1940s. It is concluded that future change will be seen as a welcome constant to be used for the benefit of the profession and the patients and communities it serves.

A patient entering a dental office is often greeted and then checked in through the practice management system's digital appointment book. The provider is notified by an electronic signal that is visual, audible, or both. The patient is led to the treatment area and sits in a dental chair which is adjusted to the individual's size and position for the treatment, and the light is positioned. Sometimes a radiograph is taken, local anesthetic is delivered, and a handpiece--air turbine or electric--is used for the procedure. How different is this process today from a dentist treating a patient in 1864?

In the September 1884 issue of Frank Leslie's Popular Monthly magazine, a fictional dramatic short story was published concerning the dental use of nitrous oxide. Entitled, "Cora Gray," it was written by the well-known American journalist and poet John Whittaker Watson (1815-1848), who authored hundreds of sentimental, tragic and dramatic poems, serials and stories concerning the destitute lives and deaths of downtrodden young women of that time. His greatest poetic effort, "Beautiful Snow," (1869) tells of a young prostitute who freezes to death in a snow bank. Watson, born in New York City, was educated at the University of New York, where he studied medicine. He also developed and used his skills as an engraver, journalist and writer. Watson obviously based his imaginative narrative on his medical knowledge of nitrous oxide and its physical and psychological side effects when inhaled. The story centers around the dreamlike romantic experiences of a 19-year-old female dental patient while she is under the effects of this gas. It explicitly depicts the administration of nitrous oxide and the resulting erotic visions and hallucinations that the young patient experiences. We make reference to other cautionary scientific writings from the late 1800s, in order to point out and clarify the potentially negative repercussions of nitrous oxide when administered to female dental patients without the presence of a third party. The ethics and propriety of anesthesia administration remain as perennial questions in dentistry to this day.

Horace Wells, a dentist in Hartford, Connecticut, first used nitrous oxide in dentistry in December 1844. A few weeks later he travelled to Boston, Massachusetts, to demonstrate to physicians and dentists the use of nitrous oxide in painful procedures. Wells' unsuccessful demonstration of nitrous oxide for the extraction of a tooth is well known, but other details of this trip are poorly understood. A description of Wells' visit to Boston was compiled using information from 21 statements and 5 newspaper notices. The precise date and location of Wells' demonstration could not be determined. There is no primary evidence that Wells' demonstration occurred in the surgical amphitheater (Ether Dome) at Massachusetts General Hospital. Wells' demonstration of nitrous oxide probably occurred around the end of January 1845, in a public hall on Washington Street, Boston.

Since centuries the first public demonstration of the anaesthetic properties of ether by William Thomas Green Morton at the Massachusetts General Hospital in Boston on October 16th 1846 is celebrated as "Ether Day" world-wide. The news of the beneficial effects, primarily disposed as a "Yankee Invention", spread over all continents quickly. This was the result of an article, published in the Boston Medical and Surgical Journal on November 18th, 1846. It is mentioning worth that this article was written when Morton had disclosed that the used "preparation", later named as "Nostrum" or "Letheon", was sulphuric ether. The important discovery later became a patent case and was overshadowed by a long lasting priority claim. Nevertheless the readers of the New England Journal of Medicine voted in a survey that this article was the most important publication in the 200 years journals history ever., (© Georg Thieme Verlag Stuttgart · New York.)

No legitimate history of anesthesiology can exclude the contributions of American dentistry. Similarly, no history of anesthesiology in dentistry can exclude the contributions of oral and maxillofacial surgery (OMS). Many contributions of OMS to the art and science of anesthesiology have been singular, cutting edge when introduced, have stood the test of time, and have subsequently been universally incorporated into the general discipline. The process continues to this day with regard to the innovations and refinements OMS has proffered to the control of anxiety and pain. This article offers a brief review of some of these gifts., (Copyright © 2013 Elsevier Inc. All rights reserved.)

Discussions regarding the use of hypnotism in dentistry featured prominently in dental journals and society proceedings during the decades around the turn of the twentieth century. Many dentists used hypnotic suggestion either as the sole anesthetic for extractions or in conjunction with local and general anesthetics for excavation and cavity filling. With the heralding of humanitarian dentistry and improved local anesthesia around 1905, a number of dentists advocated using suggestion psychology to calm nervous patients and increase their comfort and satisfaction levels while undergoing dental procedures. The practice of hypnotic suggestion with local and general anesthesia in providing patients with increasingly painless procedures constituted the earliest variety of behavioral dentistry, a discipline not fully developed until the closing decades of the twentieth century. Hypnosis and suggestion became driving forces for psychological applications in the formative years of behavioral dentistry., (© 2013 Wiley Periodicals, Inc.)

William Stewart Halsted is considered to be one of the most influential and innovative surgeons the USA has ever produced. His contributions to surgery are abundant, ranging from sophisticated surgical techniques in the field of breast surgery, surgery of the digestive apparatus and traumatological interventions, to the introduction of gloves in the operating theatre. Here we present Dr Halsted, together with his aide Dr Hall, as the discoverers of the technique for blocking the inferior alveolar nerve and the antero-superior dental nerve using cocaine as an anaesthetic. The anaesthetic technique, described perfectly by both surgeons in 1885, has been revolutionary in the practice of odontology since its introduction, offering dentists the possibility of performing invasive interventions to the maxillary without pain.

In this report, we explore the little known role of Dr Nathan Cooley Keep in the dissemination of ether anesthesia in Boston. Keep was a prominent Boston dentist who, for a short time, taught and employed both William Morton and Horace Wells. He used ether anesthesia for a variety of dental and other surgical procedures requiring pain control. Keep administered ether to anesthetize Henry Wadsworth Longfellow's wife during the delivery of their daughter. This was the first use of ether for obstetric anesthesia. Dr Keep was also the first Dean of the Harvard Dental School and convinced the Massachusetts General Hospital to appoint a dentist to the staff of the hospital for the first time., (Copyright © 2011 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.)

Historically there was an attempt by many dental practitioners to implicate anesthetic solutions in the death of the dental pulp. However, their implications may or may not have been valid, as damage to the dental pulp may have resulted from excessive and deleterious restorative procedures on teeth that were anesthetized. Unfortunately little was known about the anesthetic solutions at that time, their composition, which included vasoconstrictors, and their potential to alter pulpal blood flow. This paper will explore both the historical perspectives and concerns regarding the impact of anesthetic solutions on the dental pulp through the eyes of Dr. C. Edmund Kells, along with the contemporary perspectives and realities through the eyes of science, sound research data and clinical practice.