Dental Implant Complications and Disciplinary Inquiries

I had my first experience speaking at a silent conference on Sunday. It was a rather strange experience: while the audience listened through headphones, I was the only one who could hear the ambient background noise, in addition to hearing my own voice through an earpiece. I became distracted during the opening minutes of the lecture and subsequently had to rush through the later slides, ultimately failing to deliver the key point I had intended to make.

For context, I was invited to speak at the International Dental Exhibition and Meeting (IDEM) 2026 on the topic of dental implant complications and their implications in professional misconduct allegations. Having spent the past 26 years serving on numerous Complaints Committees and Disciplinary Committees of the Singapore Dental Council, I have observed that many dentists—as well as members of the public—do not have a clear understanding of how a Disciplinary Committee (DC) operates. In this lecture, I attempted to illustrate my personal approach to the DC process by examining three past cases published on the SDC website, dissecting each case to demonstrate how the verdict was reached and how the appropriate sanction was determined.

I would now like to supplement the lecture by addressing the points I had intended to cover but was unable to present due to poor time management arising from my distraction with the (to me) novel silent conference format.

The first case I presented was published in 2016. It involved the placement of an implant into a previously bone-grafted site earlier than what most guidelines recommended. The outcome was an infection that eventually necessitated removal of the implant by a specialist, who subsequently took over the case and completed the restoration successfully. During the hearing, both the respondent and the prosecution referred to a set of consensus statements published by the International Team for Implantology (ITI) in 2003. In addition, expert witnesses were called by both parties, and there was consensus that a bone graft consolidation period of four to six months is physiologically required.

The case concluded with the dentist being found guilty as charged, and a fine and suspension were imposed. There was considerable disquiet within the dental fraternity at the time, as some felt that suspending a dentist for a failed implant was excessively harsh and were concerned about the potential implications for the practice of implant dentistry in Singapore.

While judgments by Disciplinary Committees can have a significant impact on clinical practice, each case has its own unique circumstances, and decisions are based on the aggregate of all evidence presented before the DC. In this case, the outcome resulted from a combination of factors including published guidelines, expert opinions (including those supporting the respondent), material witnesses (including both the dentist and the patient), the manner in which the respective legal teams presented the evidence, and the DC members’ interpretation of that evidence. No two cases are identical, and it does not follow that placing an implant before four months after bone grafting would automatically render a dentist guilty of professional misconduct.

This case partly relied on consensus statements published in 2003, which may have been outdated by 2016. Given the rapid pace of research and development in dental implantology, clinical practice guidelines generally have a validity period of approximately five years. For a more robust assessment of prevailing standards of care, it is necessary to review up-to-date literature, with particular emphasis on systematic reviews and meta-analyses published within the preceding five years.

I also took the opportunity to highlight that organisations and authors who publish clinical guidelines consistently include caveats stating that such guidelines are not intended to be dogmatic and should not be treated as law. Clinical decision-making ultimately remains the responsibility of the clinician. Strict adherence to guidelines does not automatically preclude professional misconduct, just as deviation from them is not necessarily improper.

In Singapore, the only set of clinical practice guidelines on dental implants was published jointly by the Ministry of Health and the Academy of Medicine in 2012. I had the privilege of chairing the workgroup responsible for drafting those guidelines, although an update is long overdue. Clinical practice guidelines are based on a thorough review of the scientific literature, and their recommendations are graded according to the strength of the supporting evidence. Recommendations founded on level 1 evidence—such as meta-analyses and systematic reviews of randomised controlled trials—are awarded a Grade A rating. In contrast, recommendations based on level 5 evidence, such as expert opinion and consensus statements, are assigned a Grade C rating.

In a DC hearing, expert witnesses play a critical role. An expert opinion substantiated by high-level evidence carries greater weight than one that relies on literature lower in the evidence-based medicine hierarchy. In cases of alleged professional misconduct, the prosecution must establish that there is a generally accepted standard of care and that the dentist charged has either intentionally departed from that standard or that the deviation was extremely severe.

An expert witness, regardless of whether engaged by the prosecution or the respondent, has a duty to present an impartial opinion grounded in the best available scientific evidence. Nonetheless, opposing opinions frequently arise because experts may interpret the same literature differently, and legal teams will naturally select experts whose interpretations best support their respective positions.

The Singapore Dental Council often appoints DC members based on the specific issues involved in a case. For example, where dental implant surgical complications are concerned, an oral and maxillofacial surgeon is often appointed to the DC. This approach has both advantages and disadvantages. As a DC member serves in a judicial capacity, having a practising specialist on the panel can facilitate a more nuanced understanding of the medical literature cited by expert witnesses and of the evidence presented by the respondent. However, such a member may inadvertently assume the role of the ‘ultimate expert’, potentially overriding the opinions of expert witnesses from either side. There is also a risk that such a member may cross-examine witnesses from the bench, which could give rise to a perception of bias. A high level of restraint is therefore required.

Personally, when chairing a DC hearing involving a surgical complication, I take great care to separate my personal professional views from the evidence presented by both sides, ensuring that any adjudication is based strictly on the evidence before the committee rather than on my own clinical practice.

I will continue with the discussion of the other two cases in my next few posts.