Single Joint Expert Instruction in Dental Claims: Preparing for the Joint Statement Process in Endodontic Cases

In clinical negligence claims involving endodontic treatment, instructing a single joint expert (SJE) under CPR Part 35 can streamline proceedings and reduce costs. However, the joint statement process requires careful preparation to ensure the expert’s findings are robust, court-ready, and aligned with the legal issues in dispute. This article examines key considerations for solicitors instructing an SJE in endodontic cases, with particular focus on the joint statement process and its implications for litigation strategy and quantum.

Clinical Context in Endodontic Claims

Endodontic treatment, commonly known as root canal therapy, is a technically demanding procedure requiring precise identification and management of the root canal system. The following clinical issues frequently arise in medico-legal claims:

• Missed canals: Failure to locate and treat all canals within a tooth, particularly in multi-rooted teeth such as molars, is a recognised cause of persistent infection and treatment failure. Anatomical variations, such as the presence of a second mesio-buccal canal in maxillary molars, are well-documented in the literature and must be actively sought during treatment.
• Perforation: Iatrogenic perforation of the root or pulp chamber floor can occur during access preparation or canal instrumentation. The location and size of the perforation, as well as the timing and adequacy of its management, are critical factors in determining prognosis. Perforations promptly sealed with biocompatible materials such as mineral trioxide aggregate (MTA) may have a more favourable outcome than those left untreated or managed with inappropriate materials.
• Persistent apical periodontitis: Radiographic evidence of periapical radiolucency following endodontic treatment may indicate persistent infection, often due to inadequate cleaning, shaping, or obturation of the canal system. It is essential to distinguish between active infection and healing responses, particularly in the early post-treatment period. Current NICE guidance and the European Society of Endodontology (ESE) position statements provide criteria for assessing the success of endodontic treatment, including the absence of clinical symptoms and radiographic evidence of periapical healing.
• Separated instruments: The breakage of endodontic files within the canal can complicate treatment and may necessitate referral to a specialist for retrieval or surgical intervention. The clinical significance of a separated instrument depends on its location, the stage of treatment at which it occurred, and whether it obstructs access to the apical portion of the canal. In some cases, the instrument may be bypassed or left in situ if it does not compromise the outcome.
• Sodium hypochlorite extrusion injury: Accidental extrusion of sodium hypochlorite beyond the apex can result in severe pain, swelling, and tissue necrosis. Management of such injuries requires immediate recognition, irrigation with saline, and, in severe cases, referral for specialist care. The consent process should include discussion of this risk, particularly in cases where the apex is open or the periapical tissues are inflamed.

Legal Relevance: Breach, Causation, and the Role of the Expert

In endodontic claims, the expert witness must address two principal questions: whether the treatment provided fell below the standard expected of a reasonably competent dentist, and whether any breach of duty caused or materially contributed to the claimant’s harm. These questions are governed by the legal principles established in Bolam v Friern Hospital Management Committee [1957] and Bolitho v City and Hackney Health Authority [1998], which require the court to consider whether the clinician’s actions would be supported by a responsible body of dental opinion, provided that opinion is capable of withstanding logical analysis.

Breach of Duty

The expert must assess whether the dentist’s treatment adhered to accepted clinical standards. For example, in cases of missed canals, the expert will consider whether the dentist took reasonable steps to identify all canals, including the use of magnification, appropriate radiographs, and a thorough understanding of root canal anatomy. The GDC Standards for the Dental Team provide that dentists must recognise their limitations and refer patients to a specialist when necessary. Failure to refer a complex case, such as one involving a tooth with unusual anatomy or a history of previous endodontic treatment, may constitute a breach of duty if the dentist lacked the necessary skills or equipment to manage the case effectively.

Causation

Establishing causation in endodontic claims can be challenging, particularly where the claimant had pre-existing dental disease. The expert must determine whether the alleged breach of duty caused or materially contributed to the adverse outcome. For instance, in cases of persistent apical periodontitis, the expert will need to assess whether the infection was present before treatment, whether it was adequately managed during the procedure, and whether the dentist’s actions (or omissions) led to its persistence or worsening. The legal test for causation is set out in Barnett v Chelsea and Kensington HMC [1969] and Bailey v Ministry of Defence [2008], which require the claimant to demonstrate that the breach of duty more than minimally contributed to the harm suffered.

The Role of the Expert Witness

The expert witness in endodontic claims should ideally be a dentist with substantial experience in endodontics, preferably one who holds a GDC specialist registration in endodontics or has completed advanced training in the field. The expert’s role is to provide an independent, evidence-based opinion on the standard of care and causation, without advocating for either party. CPR Part 35 and Practice Direction 35 set out the expert’s overriding duty to the court, which takes precedence over any obligation to the instructing party. The expert’s report must comply with the requirements of CPR 35.10, including a statement of truth and a declaration that the expert understands their duty to the court.

Preparing for the Joint Statement Process

The joint statement process, governed by CPR 35.12, is a critical stage in SJE instruction. The purpose of the joint statement is to identify areas of agreement and disagreement between the experts, clarify the issues in dispute, and narrow the scope of the litigation. In endodontic cases, the joint statement can have significant implications for both liability and quantum, particularly where the prognosis of the tooth is in question. The following steps can help solicitors prepare effectively for the joint statement process:

1. Selecting the Right Expert

The choice of expert is pivotal in endodontic claims. The expert should have the necessary clinical expertise to address the specific issues in the case, such as missed canals, perforation, or persistent apical periodontitis. Instructing an expert with a general dental background, rather than a specialist in endodontics, may result in an opinion that lacks the depth and specificity required to withstand scrutiny in court. Solicitors should review the expert’s CV to ensure they have relevant experience, including:

• Postgraduate qualifications or training in endodontics.
• Experience in managing complex endodontic cases, including retreatment and surgical endodontics.
• Familiarity with current guidelines, such as those published by the ESE and the British Endodontic Society.
• A track record of providing expert witness reports in dental claims, with experience of the joint statement process.

2. Obtaining and Reviewing the Clinical Records

Comprehensive clinical records are essential for the expert to form an accurate opinion. Solicitors should obtain the following documents before instructing the expert:

• Clinical notes: These should include a detailed account of the treatment provided, including the steps taken to locate and treat all canals, the materials used, and any complications encountered. The notes should also document the consent process, including any discussions about the risks of treatment and the alternatives considered.
• Radiographs: Pre-operative, intra-operative, and post-operative radiographs are critical for assessing the quality of the endodontic treatment. The expert will need to review the radiographs to determine whether the canals were adequately cleaned, shaped, and obturated, and whether any complications, such as perforation or separated instruments, were appropriately managed. In some cases, cone beam computed tomography (CBCT) may be necessary to provide a three-dimensional assessment of the root canal system.
• Referral letters and specialist reports: If the claimant was referred to a specialist for further treatment, the expert will need to review the referral letters and any subsequent reports to assess whether the referral was timely and appropriate.
• Laboratory reports: In cases involving surgical endodontics or the retrieval of separated instruments, laboratory reports may provide additional evidence of the clinical findings.

3. Framing the Instructions

The instructions to the SJE should be clear, focused, and aligned with the legal issues in dispute. Solicitors should avoid overly broad or vague questions, as these can lead to unfocused reports and joint statements. Instead, the instructions should be tailored to the specific allegations in the case. For example:

• Did the dentist take reasonable steps to identify and treat all canals in the tooth?
• Was the perforation managed in accordance with accepted clinical standards?
• Did the dentist’s failure to refer the claimant to a specialist contribute to the persistence of the infection?
• What is the prognosis for the tooth, and what further treatment, if any, is required?

The instructions should also request that the expert addresses any areas of disagreement between the parties, such as the interpretation of radiographs or the significance of pre-existing dental disease.

4. Preparing for the Joint Discussion

The joint discussion between the experts is an opportunity to clarify the issues in dispute and identify areas of agreement. Solicitors should prepare their experts for the discussion by:

• Reviewing the expert’s report: The expert should be familiar with the contents of their report and prepared to defend their opinion under scrutiny. Solicitors should discuss any potential weaknesses in the expert’s opinion and ensure that the expert is able to address these in the joint statement.
• Identifying key areas of disagreement: Solicitors should work with their expert to identify the key areas of disagreement with the opposing expert’s report. These may include the interpretation of radiographs, the significance of pre-existing disease, or the prognosis for the tooth. The expert should be prepared to explain their reasoning and provide evidence to support their opinion.
• Considering the implications for quantum: In endodontic claims, the prognosis for the tooth can have significant implications for quantum, particularly where the tooth is unrestorable and requires extraction. The joint statement should address the likely outcome of any further treatment, including the need for dental implants, bridges, or dentures. The expert should also consider the claimant’s age, oral health, and any pre-existing dental conditions that may affect the prognosis.

5. Drafting the Joint Statement

The joint statement should be a concise, focused document that clearly sets out the areas of agreement and disagreement between the experts. It should not introduce new opinions or evidence that were not included in the experts’ original reports. The joint statement should address the following:

• Areas of agreement: The experts should identify any issues on which they agree, such as the standard of care expected in the circumstances or the likely cause of the adverse outcome.
• Areas of disagreement: The experts should clearly set out the issues on which they disagree, along with their reasons for doing so. For example, the experts may disagree on whether the dentist’s failure to locate a canal constituted a breach of duty, or whether the claimant’s pre-existing dental disease contributed to the adverse outcome.
• Prognosis and future treatment: The joint statement should address the prognosis for the tooth and the likely outcome of any further treatment. This may include an assessment of the need for retreatment, surgical endodontics, or extraction and replacement with a dental implant or bridge.
• Quantum implications: The experts should consider the implications of their findings for quantum, including the cost of any future dental care and the impact on the claimant’s quality of life. For example, if the tooth is unrestorable and requires extraction, the experts should assess the likely cost of replacement options and the impact on the claimant’s ability to eat, speak, and socialise.

Common Pitfalls in Endodontic Claims

Solicitors should be aware of the following common pitfalls in endodontic claims, which can undermine the strength of the case and complicate the joint statement process:

1. Instructing the Wrong Discipline

Instructing an expert with a general dental background, rather than a specialist in endodontics, can result in an opinion that lacks the necessary depth and specificity. For example, a general dentist may not be familiar with the latest techniques for managing complex canal anatomy or the criteria for referral to a specialist. Solicitors should ensure that the expert has the relevant clinical expertise to address the specific issues in the case.

2. Over-Reading Radiographs

Radiographs are a critical source of evidence in endodontic claims, but they must be interpreted with caution. For example, a periapical radiolucency may indicate persistent infection, but it can also represent a healing response or a non-pathological lesion. The expert should consider the clinical context, including the claimant’s symptoms and the timing of the radiograph, before forming an opinion on its significance.

3. Causation Errors Where Pre-Existing Disease is Present

In cases where the claimant had pre-existing dental disease, the expert must carefully assess whether the dentist’s actions caused or materially contributed to the adverse outcome. For example, if the claimant had a pre-existing periapical infection, the expert should consider whether the dentist’s treatment was likely to have resolved the infection or whether it was already too advanced to be saved. The legal test for causation requires the claimant to demonstrate that the breach of duty more than minimally contributed to the harm suffered, which can be challenging in cases where the pre-existing disease was severe.

4. Prognosis Uncertainty

The prognosis for a tooth following endodontic treatment can be uncertain, particularly where there are complicating factors such as perforation or persistent infection. The expert should provide a balanced assessment of the likely outcome, taking into account the available evidence and the limitations of the clinical data. Where the prognosis is uncertain, the expert should explain the reasons for this and provide a range of possible outcomes.

5. Consent Evidence Gaps

The consent process is a critical aspect of endodontic treatment, particularly where there are risks of complications such as perforation, separated instruments, or sodium hypochlorite extrusion. The expert should review the clinical records to assess whether the dentist provided the claimant with sufficient information about the risks and benefits of the treatment, as well as the alternatives. The legal principles established in Montgomery v Lanarkshire Health Board [2015] require that the claimant be informed of any material risks and reasonable alternatives, and that their consent be based on a full understanding of these factors.

Practical Guidance for Solicitors

To maximise the effectiveness of the SJE instruction and joint statement process in endodontic claims, solicitors should consider the following practical steps:

• Match the expert to the clinical issue: Ensure that the expert has the necessary clinical expertise to address the specific allegations in the case. For example, if the claim involves a missed canal in a maxillary molar, the expert should have experience in managing complex canal anatomy and be familiar with the latest techniques for locating and treating such canals.
• Obtain all relevant records: Comprehensive clinical records, including radiographs, referral letters, and laboratory reports, are essential for the expert to form an accurate opinion. Solicitors should ensure that all relevant documents are obtained and provided to the expert before they commence their report.
• Frame focused instructions: The instructions to the expert should be clear, focused, and aligned with the legal issues in dispute. Avoid overly broad or vague questions, as these can lead to unfocused reports and joint statements.
• Prepare the expert for the joint discussion: The joint discussion is an opportunity to clarify the issues in dispute and identify areas of agreement. Solicitors should prepare their expert for the discussion by reviewing their report, identifying key areas of disagreement, and considering the implications for quantum.
• Review the joint statement carefully: The joint statement should be a concise, focused document that clearly sets out the areas of agreement and disagreement between the experts. Solicitors should review the statement carefully to ensure that it addresses all the key issues and does not introduce new opinions or evidence.

Conclusion

The instruction of a single joint expert in endodontic claims can streamline proceedings and reduce costs, but the joint statement process requires careful preparation to ensure that the expert’s findings are robust and aligned with the legal issues in dispute. Solicitors should select an expert with the necessary clinical expertise, obtain comprehensive clinical records, frame focused instructions, and prepare the expert for the joint discussion. By taking these steps, solicitors can maximise the effectiveness of the SJE instruction and ensure that the joint statement process contributes to a fair and efficient resolution of the claim.