Professor David Harris

Professor David Harris

Thirty years ago, the first osseointegrated dental implant was placed in a patient in Ireland by Professor David Harris. PAUL O’GRADY asked him about the history of implants in Ireland.

Implants were once the snake oil of dentistry. After centuries of failure resulting in rejection by the body and frequently leaving behind scarred gums and wrecked mouths, reputable dentists were dismissive of the notion of dental implants. During his own time training to be an oral surgeon at University College Hospital in London in the 1960s and early 1970s, Professor David Harris saw the disastrous effects of screws, vents and blades being used as implants. These had appeared without clinical trials and left behind mouths so scarred that not even dentures could be used.

Implants in Ireland
And so in the late 1970s, David found himself working in Dublin with, among his patients, a pool of 10 edentulous people to whom he felt he had nothing to offer. Then word began to emerge of a Swedish system that was proving quite successful. Results of a 10-year study undertaken by the pioneer of this research, Professor Per-Ingvar Brånemark, had been published in a reputable Scandinavian journal. The world of dentistry remained, for the most part, deeply sceptical. Professor George Zarb of Toronto, however, was intrigued. He visited Sweden and then conducted studies to replicate Professor Brånemark’s work. Zarb’s independent study also had 98% success with dental implants in the lower jaw. He invited Brånemark to present his work at a global conference in Toronto in 1982, at which he described the process of osseointegration whereby metal integrates into bone to provide the stable base for an implant.

The proceedings in Toronto provided weighty evidence of success and the possibility of treatments for patients who had no prospect of treatment up to that point. Prof. Harris decided to see if he could undertake such work and says: “It was not easy to get training as Professor Brånemark was very protective of his technique. You had to provide evidence that you were an oral or periodontal surgeon and work with a prosthodontist”. David went to Sweden on one of the very early courses and examined patient after patient that had implants. He says: “The integrity of the team treating patients with Brånemark – the oral surgeon Ulf Leckolm and the prosthodontist Torsten Jemt – was apparent and convincing”.

However, the cost was huge. At the time the Ir£9,000 required to purchase the machines and materials would have bought a house in Dublin. However, Professor Harris was convinced and he carried out the first implant in 1983 at the Mount Carmel Hospital. The lady in question, who had been missing her teeth for 20 years, received a lower jaw of teeth (that’s all that was possible at that time). She is still alive with functioning implants to this day.

David Harris points out that the reputation of implants was so bad that when his patients went to their regular dentist or even their GP, they were often advised against proceeding, and David says he understands this. Based on all previous evidence, their advice was understandable. Two consultant prosthodontists collaborated from the start with David: Frank Houston of TCD and Gerard Buckley of UCC but, according to David, it took a period of five to six years for many dentists to accept that a reliable, scientific technique was now in place.

The Irish team developed an excellent rapport with the team in Sweden, and in 1986 Professor Brånemark accepted an invitation to speak at the Royal Academy of Medicine in Dublin. Following meetings, including with Derry Shanley, then Dean of the DDUH, Brånemark decided to make Dublin a centre to collaborate with, along with Professor Daniel van Steenberghe and his team in the University of Leuven in Belgium. The newly opened Blackrock Clinic was put at his disposal. In early 1987, Brånemark, at the invitation of Professor Harris and his colleagues, demonstrated advanced bone grafting techniques in operations on Irish patients in the Blackrock Clinic. Colleagues from over 40 countries attended the demonstration, and the patients were treated pro bono by Professor Brånemark.

The following year, a major conference on implants was organised at TCD attended by nearly every major international figure in implants in the world and again addressed by Professor Brånemark. This really put Dublin on the map in the world of the science of implants. And while dental implants are now well established in Ireland and globally, early adopters in Ireland (prior to 1986) included the oral surgeons Nicholas Mahon (RIP), Spencer Woolfe, Peter Cowan and Sean Sheridan. Early adopting prosthodontists included Billy Davis, Noel O’Grady, Andrew Woolfe and Ollie Grant (RIP). By 1992, several more teams began providing implant treatment to a very high standard in Ireland. In fact, since then, Ireland has produced a considerable volume of original research in the area at the three dental schools – UCC, TCD and QUB. A seminar to mark 30 years of implant dentistry in Ireland is taking place on November 7 next and is open to all interested parties.

Professor Per-Ingvar Brånemark, Professor Daniel van Steenberghe and Professor David Harris

Professor Per-Ingvar Brånemark (centre) with Professor Daniel van Steenberghe (left) and Professor Harris outside the Blackrock Clinic in 1986. Both Professors Brånemark and van Steenberghe were awarded Honorary Fellowships of the Faculty of Dentistry of the Royal College of Surgeons in Ireland as a result of their contribution to the development of implant dentistry.

Developments
Since its establishment as a part of mainstream dentistry, the science of implants has continued to advance. These developments have made implants available  for the upper jaw, for the partially dentate and for the single tooth. “In fact, TCD was part of the first multi-centre trial for single tooth implants with myself and Frank Houston. Other major advances have been made in bone augmentation, soft tissue grafting and guided tissue regeneration”, says David, who was appointed as a Senior Lecturer in Implant Dentistry at Trinity College Dublin in 2000.

The other major advance has been in the shortening of the delay between the placing of the implants and the fixing of the prosthetics. “In the past 10 years, with the further development of implant surfaces, the gap has been reduced and in suitable cases, the prosthesis can be fitted on the same day as implants, says David. He also noted the use of CT technology, which allows planning of implant cases in virtual reality and transferring that information to the operative site.

A challenge for the future, he continues, is to understand the role of peri-implantitis: its aetiology, prevention and treatment; and to understand the role of stem cells and growth factors in achieving implant success.

A life in dentistry
David Harris was born and raised in Dublin, where he attended Wesley College. He entered medicine after leaving school, but switched to dentistry after the shared first year “because my dental student friends seemed to have more fun”. He graduated in 1964 from RCSI and spent six months as a house surgeon in the DDUH. He went to England and got his primary FDS exams and returned to Dublin, where he worked part-time in both practice and the DDUH. Then he got a break: he got a place as a registrar in University College Hospital (UCH) London Dental School. He trained for two years and sat his final FDS, after which he decided to complete his medical studies. UCH London accepted him and, with credit for his training to date, within two years he had qualified.

By this time he was married to Pam Cowan, daughter of the well-known oral surgeon Adrian Cowan, and they had two small children, Paul and Abbe. They wanted to bring their children up in Ireland with their extended family close to them, so they returned and he set up in practice in Dublin in the early 1970s.

Paul is now an aviation psychologist with a strong interest in photography (a book of his photographs of Cuba is in print) and Abbe is a Feldenkrais practitioner. (Feldenkrais is a method that helps people move with greater ease and effectiveness by means of gentle body awareness.)

In his spare time, David walks, reads, swims, flies (he has a share in a single-engine Piper aircraft) and listens to music – mostly modern jazz such as Stan Getz and Keith Jarrett.

The Dental Amputee
The Dental Amputee is the title of a book written by David Harris in which he explores and explains the fate of the edentulous patient. The bad news is that being toothless is a great deal worse than most people imagine; the good news is that dental implants offer a solution that, in some instances, the patients regard as transformational. The book is being published by Londubh and is due out in late autumn.