This lecture by Dr. Thomas Wiser provides a comprehensive overview of apical root resection, framed by the new German clinical guidelines from late 2022. The presentation addresses the discrepancy between high published success rates and real-world data, emphasizing the procedure as a final attempt to preserve a tooth. A key point is the updated definition, which now mandates a retrograde, bacteria-tight closure as an integral part of the resection. The lecture covers indications (e.g., failed endodontics, obliterated canals), contraindications, and critical prognostic factors such as lesion size, pre-operative symptoms, and patient age. Dr. Wiser details the surgical technique, advocating for an intrasulcular incision for best visibility, a 3-4mm rectangular root resection, and the use of MTA as the preferred retrograde filling material. While magnification aids are strongly recommended for precision, they are not legally required. The presentation also introduces modern advancements like guided surgery for minimally invasive procedures and briefly discusses the related topic of apical implant resection. The core message is that apical root resection is an elective surgery requiring careful individual case selection and thorough informed consent.
A Clinical Guide to Apical Root Resection
0:00:47 Evidence and Guidelines: The lecture highlights a discrepancy between high published success rates (around 90%) and real-world data. A new 2022 guideline was introduced to address uncertainties in indication, procedure, and complications.
0:02:27 Redefining the Procedure: Apical root resection is newly defined as the surgical removal of 3-4mm of the root apex, which mandatorily includes a retrograde filling to create a bacteria-tight seal. Resecting more than 6mm is generally not advised as it compromises the tooth's stability.
0:04:51 Resection vs. Conventional Endodontics: For apical lesions up to 4-5 mm, non-surgical endodontic treatment is the first choice and has the same prognosis as surgery. Apical resection is considered the second choice unless specific technical or patient factors make it preferable.
0:08:05 Viable Alternatives: Several alternatives exist and should be considered.
Implants: Often have fewer complications and may be the first choice over procedures like hemisection.
Intentional Replantation: Removing the tooth, treating it externally, and re-implanting it is an option in exceptional cases.
Outdated/Incorrect Methods: Simple trepanation or using antibiotics alone are not substitutes for proper treatment.
0:10:13 Primary Indications: The procedure is indicated for:
Teeth with apical periodontitis where root canals are obliterated or untreatable.
Persistent symptoms or growing lesions after a completed endodontic treatment.
Instrument fractures that cannot be removed conventionally.
Over-pressed root filling material that is impinging on critical structures like a nerve or sinus.
Positive indicators: Lesions smaller than 5mm, absence of pre-operative pain or fistula, a high-quality existing root canal filling, and patients younger than 45 years.
0:21:37 Surgical Technique and Approach: The speaker prefers an intrasulcular incision (through the gum sulcus) because it provides the best overview of the surgical site, despite a risk of gingival recession.
0:30:37 Mandatory Retrograde Filling: The use of a retrograde filling is no longer optional. MTA (Mineral Trioxide Aggregate) is highlighted as the material of choice because of its excellent sealing ability, which can even cover microcracks in the root. The retrograde cavity should be prepared to a depth of about 3mm.
0:33:06 The Role of Magnification: The use of magnification aids like dental microscopes or loupes is strongly recommended to improve precision, identify cracks, and ensure a complete seal. However, from a legal standpoint, it is not mandatory for a successful outcome.
0:39:01 Guided Modern Surgery: An advanced technique using 3D-printed surgical guides, similar to those in implantology, allows for a minimally invasive and highly precise approach to locate the root apex and perform the osteotomy.
0:43:56 Apical Implant Resection: A related but separate issue where an implant develops an apical lesion, often due to bone overheating during placement or residual bacteria. Treatment can range from monitoring an inactive lesion to surgical debridement, resection of the implant apex, or complete explantation.
0:47:26 Take-Home Message: Apical root resection is an elective operation and should be considered the last attempt to save a tooth. The decision to proceed must be made on an individual basis, considering all local and general health factors, and requires thorough informed consent from the patient about the risks, success rates, and alternatives.