This comprehensive lecture by Dr. Thomas Wiser addresses the critical topic of complications in implantology, covering both surgical and biological risks. The presentation stresses that despite high implant survival rates, complication rates remain significant, often due to a lack of standardization in definition and reporting. Key surgical complications discussed include nerve damage (especially in the posterior mandible, requiring detailed 3D planning), severe bleeding (particularly from lingual perforations), and mandibular fractures resulting from extreme atrophy or severe peri-implantitis. The lecture emphasizes the necessity of interdisciplinary management for medically compromised patients (e.g., those on immunosuppressants or anticoagulants/DOACs). Furthermore, Dr. Wiser details the management of biological complications, specifically peri-implant mucositis and peri-implantitis, highlighting that peri-implantitis is resistant to non-surgical methods. Successful treatment involves a combination of techniques, including surgical flap reflection, thorough cleaning (like using the innovative Galvano Surge technique and implantoplasty), and augmentation, often resulting in soft tissue recession. Prophylaxis is positioned as the most crucial element in long-term success.
Complications in Implantology: A Comprehensive Review
0:06 Introduction and Background: Dr. Wiser, head of the Implant Center at the Oral and Maxillofacial Surgery Department in Essen, Germany, introduces the lecture on implant complications. Patient expectations include longevity, function, and aesthetics with few complications.
0:30 Factors Affecting Outcome: Treatment results depend on surgery, general health, medication, nutrition, treatment strategy, and type of prosthetic chosen.
2:57 Defining Complications: While some studies report implant survival rates over 90% after 25 years (Balshi), literature shows a wide complication rate (14% to 65%), partly due to the lack of a standardized definition of "complication."
5:38 Implant Success vs. Unsuccess: Implant success (Spearman definition) requires no mobility, no extensive peri-implant inflammation, no damage to anatomical structures, and sufficient aesthetics/functionality. Absolute unsuccess means implant failure (no osseointegration or unusable position); relative unsuccess means the final result doesn't meet the primary wish.
7:20 COVID-19 Warning: Patients exhibiting the characteristic triad of taste disorder, xerostomia, or mucosal lesions should be checked for COVID-19. It is recommended to avoid elective surgery (including implantology) for 7 weeks post-infection due to increased complication risk and negative influence on bone healing.
9:59 General Health/Contraindications (Absolute CIs): Absolute contraindications are mostly temporary (e.g., fresh heart attack, new valve replacement, active cancer therapy, IV bisphosphonate therapy). The ASA risk assessment (13:48) is crucial for determining if a patient should be treated in a private office (ASA 1 or 2, sometimes 3, never 4 or 5).
11:18 Immunocompromised Patients: Implants are possible even in patients on immunosuppressive medication (e.g., after organ transplantation), but the control level of the disease is more important than the disease itself. Interdisciplinary coordination with the responsible doctor is mandatory.
18:05 Implants in Children: Implants in children carry the risk of remaining fixed while the jaw grows, leading to an unfavorable position. Recommendations are generally to wait until boys are 17+ and girls 15+ (18+ in Germany for insurance coverage).
20:52 Diagnostic Importance of 3D Imaging: It is vital to use 3D imaging (CBCT) to detect unexpected issues like residual roots or foreign bodies (21:07) that are invisible on 2D X-rays, as well as unexpected pathologies like tumors (25:09 - keratistic tumor example).
26:18 Infection Management (Early Detection): Infections present with swelling, pain, and exudate. Early second-stage surgery (27:33) is crucial if a fistula or uncovered cover screw is detected early to ensure osseointegration and prevent soft tissue integration, which increases failure risk.
28:47 Immediate Implant Placement (IIP): IIP is possible even in alveoli with chronic periapical lesions if meticulous curettage and antimicrobial/laser therapy are performed. Primary stability is a prerequisite (31:47).
33:08 Grafting Exposed Surfaces: Exposed implant surfaces after immediate placement or augmentation should be covered with autogenous bone (32:10) to promote healing and conserve bone width.
41:02 Ensuring Tension-Free Prosthetics: The Sheffield Test (41:12) is used to confirm the quality and tension-free fit of the superstructure on the model, reducing risks associated with chronic loading.
43:55 Wound Dehiscence/Disturbances: Causes include infection, edema, poor compliance, or over-aggressive immediate loading (44:47). If extensive augmentation was performed, surgical revision is usually required (46:58).
59:12 Nerve Damage (Nervous Alveolaris Inferior): Nerve damage can be primary (trauma during surgery/anesthesia) or secondary (pressure from hematoma/inflammation). Surgery is mandatory for a cut nerve. Prevention relies on 3D planning, maintaining a 1-2 mm vertical distance from the canal, and 5-7 mm distance from the foramen mental.
1:14:18 Bleeding Complications: Bleeding sources include vessels, bone, or coagulation disorders. Lingual perforation (1:17:05) in the posterior/mid-mandible is the most dramatic risk due to the nearby lingual artery, potentially causing airway obstruction. 3D imaging is essential for prevention.
1:20:49 Anticoagulation Management (DOACs): Managing Direct Oral Anticoagulants (DOACs) requires interdisciplinary consultation; stopping medication 1-3 days pre-op for high-risk procedures, depending on kidney function. Dual antiplatelet therapy contraindicates implant surgery (1:23:31).
1:27:00 Mandible Fracture: Risk factors include excessive implant size, traumatic insertion, or significant bone weakening, often due to undetected progressive peri-implantitis (1:27:47). Treatment involves specialized osteosynthesis.
1:32:14 Sinus Perforation/Migration: While small perforations might heal, implant migration into the sinus necessitates removal (1:34:48). CBCT confirms positioning.
1:40:47 Peri-Implant Inflammation (Classification): Differentiation is key: Mucositis is inflammation restricted to soft tissue (no bone loss, bleeding on probing); Peri-implantitis includes mucositis signs plus bone loss (1:44:33). Prognostic security for peri-implantitis treatment is lower than for periodontitis.
1:51:31 Etiologic Factors: Multi-factorial, including general risks (periodontitis history, smoking, genetics), local factors (missing fixed gingiva, cement residue, malpositioning), and biomechanical overload (bruxism, 1:56:08).
1:58:31 Soft Tissue Management: Adequate keratinized peri-implant gingiva (2-6 mm) reduces the risk of inflammation (1:59:52). Autogenous soft tissue grafts (palatal tissue, 2:00:49) remain superior to substitutes for creating fixed gingiva.
2:16:44 Treatment Strategy: Non-surgical therapy is effective for mucositis but demonstrates limited efficiency for peri-implantitis; surgical intervention is often required quickly (2:19:34).
2:20:38 Decontamination Protocol: Dr. Wiser uses a combined approach: pre- and post-op oral antibiotics (Amoxicillin/Clindamycin), local Metronidazole paste, mechanical cleaning (e.g., metallic brush), H2O2, and soft laser therapy (2:25:48), even against current guideline recommendations.
2:21:44 Implantoplasty: Smoothing the exposed, infected implant threads is effective, reduces pocket depth, and does not weaken the implant, despite earlier concerns (2:22:00).
2:38:08 Galvano Surge Technique: This electrolytic cleaning method (using H2O2 and a specialized adapter) effectively removes plaque and contamination from the implant surface via creating hydrogen bubbles.
2:42:55 Key Takeaway: The combination of methods (flap, cleaning, augmentation, implantoplasty, possibly Galvano Surge) is the best approach for complex peri-implantitis. Successful therapy often results in soft tissue recession. Prophylaxis is the best treatment (2:43:22).