Osteo odonto keratoprosthesis, usually called OOKP, is a surgical procedure that restores vision to people with severe corneal blindness by anchoring a tiny optical lens inside a piece of the patient’s own tooth and jawbone, then implanting that assembly into the eye. It sounds almost medieval, but the logic is elegant: the body recognizes its own dental tissue and tolerates it far better than synthetic materials alone. For patients who have exhausted every other option, including corneal transplants, OOKP remains one of the few procedures that can bring back functional sight, sometimes for decades.
Who Is a Candidate
OOKP is not a first-line treatment. It exists for people whose corneal surface is so damaged that a standard donor corneal transplant either cannot take hold or has already failed. The most common conditions leading to OOKP include Stevens-Johnson syndrome (SJS), severe chemical or thermal burns, ocular pemphigoid, and trachoma. These are diseases that leave the front of the eye dry, scarred, and keratinized, meaning the tissue has hardened in ways that make it hostile to a traditional graft.
A case report described a 35-year-old woman with SJS who had bilateral dry eyes and corneal blindness. She had already undergone a failed corneal graft in one eye and had a non-healing corneal ulcer in the other. OOKP gave her good visual rehabilitation with a prosthesis that remained anatomically stable over the long term.1PubMed Central. Osteo-odonto keratoprosthesis in Stevens-Johnson syndrome: a case report Larger studies have also focused on SJS patients specifically, with one series including 30 eyes of patients with SJS-induced dry, keratinized ocular surfaces.2PubMed. Mucosal complications of modified osteo-odonto keratoprosthesis in chronic Stevens-Johnson syndrome
The common thread among candidates is that conventional approaches have failed or are expected to fail. If the eye’s surface cannot sustain a donor cornea because of chronic dryness or scarring, OOKP bypasses the problem entirely by using a biological scaffold the body already accepts.
How the Surgery Works
OOKP is not a single operation. It unfolds across two major stages separated by a waiting period of roughly two to four months, with each stage performed under general anesthesia. The whole process requires close collaboration between ophthalmic surgeons and oral or maxillofacial surgeons.
In the first stage, a healthy single-rooted tooth, preferably a canine, is removed from the patient’s jaw along with a surrounding block of alveolar bone and its periosteum (the membrane covering the bone). This tooth-bone unit is then carefully shaped into a thin lamina, and a small optical-grade plastic cylinder, made of polymethyl methacrylate (PMMA), is cemented into a hole drilled through its center. The assembled device is then tucked under the muscle and skin near the eye on the opposite side, typically in the cheek area below the eye socket, where it lives for two to four months. During this buried phase, the body grows a fibrous capsule around the implant, essentially incorporating it into living tissue.3PubMed Central. Osteo-odonto-keratoprosthesis: a surgical procedure for treating advanced corneal diseases
In the second stage, the surgeon retrieves the encapsulated device, inspects the fibrous tissue that has formed around it, and cleans the front and back surfaces of the optical cylinder. Meanwhile, the diseased cornea of the receiving eye is opened, and the keratoprosthesis is placed into the corneal opening with the tooth-bone lamina acting as a biological shield that holds the optical cylinder securely and protects the interior of the eye.3PubMed Central. Osteo-odonto-keratoprosthesis: a surgical procedure for treating advanced corneal diseases A buccal mucous membrane graft (tissue from inside the cheek) is often placed over the front of the eye to cover the lamina and provide a moist surface.
Why a Tooth
The choice of a tooth is not arbitrary. The canine tooth, with its long root and dense surrounding bone, provides a lamina that is strong enough to hold the optical cylinder rigidly in place while remaining biologically compatible. The tooth and alveolar bone share a blood supply and connective tissue framework that helps the construct survive once implanted. Research into explanted devices has shown that preservation of the alveolar-dental ligament, the connective tissue that originally anchored the tooth in its socket, appears essential for maintaining the integrity of the device over time.4Cornea. Histopathologic Findings in Explanted Osteo-odontokeratoprosthesis
Selecting the right tooth matters. An oral and maxillofacial workup is performed to identify the longest, widest tooth in the mouth that is free from periodontal disease.5Journal of Oral and Maxillofacial Surgery. Oral and Maxillofacial Surgeons’ Role in the First Successful Modified Osteo-Odonto-Keratoprosthesis Performed in the United States A tooth with gum disease would bring compromised bone and weakened attachment structures, which could doom the device to early failure. The canine is preferred because of its size and root length, but a premolar can sometimes serve as a backup.
What Patients Without Suitable Teeth Can Do
A significant limitation of the classic OOKP is that it requires a suitable tooth. Patients who are edentulous (have lost all their teeth), who have poor dental health across the board, or whose jaw structure is insufficient face a dead end with the standard procedure. To address this, surgeons developed an alternative that uses a piece of tibial bone from the patient’s shin instead of a tooth. The concept is the same: a biological lamina of the patient’s own bone anchors the optical cylinder, but the source tissue is the leg rather than the mouth.
Outcomes from tibial bone keratoprosthesis have been encouraging. In patients with chemical injuries, prosthesis retention at five years reached 100% for tibial bone devices, compared with about 86% for OOKP and 65% for the Boston keratoprosthesis.6PubMed. Osteo-odonto-, Tibial bone and Boston keratoprosthesis in clinically comparable cases of chemical injury and autoimmune disease For patients who have no other route back to vision because their teeth are unsuitable, the tibial modification represents their only option.7PubMed. Osteokeratoprosthesis Using Tibial Bone: Surgical Technique and Outcomes
Visual Outcomes Over Time
The results of OOKP can be striking. In a retrospective study following patients for up to 30 years using the original Strampelli technique, the device stayed intact in about 94% of eyes through the end of follow-up. Visual acuity improved dramatically in the first year, going from essentially hand-motion vision to levels where many patients could read and navigate independently. Roughly half the eyes achieved vision better than 0.05 logMAR, which is close to normal functional sight. Vision remained relatively stable for the first decade after surgery, though it tended to decline gradually beyond that point.8PubMed. Osteo-odonto-keratoprosthesis According to Strampelli Original Technique: A Retrospective Study With Up to 30 Years of Follow-up
Quality-of-life improvements mirror the acuity numbers. In a cost-effectiveness analysis from Singapore, patients went from preoperative vision equivalent to hand movements to a postoperative average far better, and their vision-related quality-of-life scores jumped meaningfully, with a gain of about 0.29 on a standardized scale.9ScienceDirect. Cost-Effectiveness of Osteo-Odonto Keratoprosthesis in Singapore For someone who has been functionally blind, the ability to see faces, read, and move through the world independently is transformative in a way that numbers alone cannot fully capture.
Patients with SJS or toxic epidermal necrolysis tended to achieve the best visual outcomes in the long-term study, which is notable given that these are among the most devastating conditions leading to corneal blindness.8PubMed. Osteo-odonto-keratoprosthesis According to Strampelli Original Technique: A Retrospective Study With Up to 30 Years of Follow-up
The Glaucoma Problem
Glaucoma is widely reported as the most frequent complication after OOKP, but the picture is murkier than it first appears. In many cases, it is difficult to determine whether the glaucoma was caused by the surgery itself or was already present because of the underlying disease. Severe chemical burns and autoimmune conditions often damage the drainage structures inside the eye long before an OOKP is ever considered. In one large series of 181 cases, true postoperative glaucoma was diagnosed in only about 10% of patients; the researchers concluded that most glaucoma complications were preexisting rather than caused by the procedure.10JAMA Ophthalmology. Modified Osteo-odonto-keratoprosthesis for Treatment of Corneal Blindness: Long-term Anatomical and Functional Outcomes in 181 Cases
Detecting and monitoring glaucoma in an OOKP eye is itself a challenge. You cannot measure eye pressure in the standard way because the front of the eye is covered by the prosthesis and mucous membrane graft. Clinicians rely instead on examining the optic nerve head through the optical cylinder using photography and visual field testing, which have been found to be the most reliable methods.11PubMed. Glaucoma management in patients with osteo-odonto-keratoprosthesis (OOKP): the Singapore OOKP Study Advanced imaging tools like optical coherence tomography can be performed through the cylinder with reasonable quality, but some technologies work poorly in this setting.
Treatment usually involves oral medication to lower eye pressure systemically, and in more severe cases, procedures like implantation of a drainage device. One study found that an Ahmed glaucoma drainage device successfully controlled pressure in about 73% of eyes over an average follow-up of nearly three years.12PubMed. Glaucoma in modified osteo-odonto-keratoprosthesis eyes: role of additional stage 1A and Ahmed glaucoma drainage device-technique and timing
Laminar Resorption and Device Failure
The other major long-term worry is resorption of the tooth-bone lamina. Over years, the body can slowly break down the bone and dentin supporting the optical cylinder. When the lamina thins enough, the device can loosen, tilt, or extrude entirely. Resorption tends to occur along the aspect where bone support is thinnest.13PubMed. Laminar resorption in modified osteo-odonto-keratoprosthesis procedure: a cause for concern Histopathologic studies have pointed to epithelial downgrowth and localized inflammation as possible mechanisms, though no single explanation fully accounts for why some laminae dissolve while others endure for decades.4Cornea. Histopathologic Findings in Explanted Osteo-odontokeratoprosthesis
Resorption is also more pronounced when a tooth from a donor rather than the patient’s own tooth is used, which is one reason autologous (self-donated) tissue is strongly preferred.14Seminars in Ophthalmology. The osteo-odonto-keratoprosthesis (OOKP) Catching resorption early matters, and this is where regular imaging comes in. CT scanning has been used to track bone and dentin loss over time, though its sensitivity is imperfect. One study comparing clinical detection to CT scanning found that both methods identified resorption in about two-thirds of cases when used together, with clinical examination slightly more sensitive but less specific.15PubMed. Detection of laminar resorption in osteo-odonto-keratoprostheses Because neither method is perfect on its own, combining the two gives the best chance of catching thinning before it threatens the prosthesis.
Lifelong Follow-Up
OOKP is not a procedure where a patient can have surgery and move on. Follow-up is lifelong, involving regular eye examinations, imaging of the lamina, dental assessments, and monitoring for complications that can appear years or even decades after the initial operation.14Seminars in Ophthalmology. The osteo-odonto-keratoprosthesis (OOKP) Complications that need watching include not just glaucoma and resorption but also problems with the mucous membrane graft, retinal detachment, and vitreous hemorrhage. The practical burden is substantial: patients need access to a specialized center and the ability to travel for appointments indefinitely.
This requirement shapes who can realistically benefit from the procedure. OOKP is concentrated in a small number of centers worldwide with the necessary combined ophthalmic and oral surgical expertise. Access is uneven, and the multi-stage nature of the surgery, combined with lifelong monitoring, creates logistical and financial barriers that go well beyond the operating room.
How OOKP Compares to Other Keratoprostheses
OOKP is not the only artificial corneal device, and understanding where it fits relative to alternatives helps clarify when it is the right choice. The Boston keratoprosthesis (Boston KPro) is probably the most widely implanted keratoprosthesis globally. It uses a synthetic design with a donor cornea carrier and does not require a tooth or bone graft, making the surgery faster and less invasive. For patients with a reasonably healthy ocular surface, the Boston KPro can work well. But for patients with the most devastated eye surfaces, the dry, keratinized conditions seen in severe burns and SJS, the Boston KPro tends to fare less favorably over time.
A comparative study found that in chemical injury cases, functional success at five years was about 86% for OOKP, 84% for tibial bone keratoprosthesis, and 71% for Boston KPro. Post-operative complications like retro-prosthetic membrane formation and uncontrolled glaucoma were more common with the Boston device.6PubMed. Osteo-odonto-, Tibial bone and Boston keratoprosthesis in clinically comparable cases of chemical injury and autoimmune disease A broader review concluded that Boston KPro and OOKP each have the most favorable outcomes for their respective indications, the key phrase being “respective.” They serve somewhat different patient populations, with OOKP shining brightest when the eye surface is too hostile for any device that relies on a donor cornea carrier.16PubMed Central. Keratoprosthesis: Current Choices and Future Development
Toward Synthetic Alternatives
One of the most active areas of OOKP-related research is the effort to replace the tooth-bone lamina with an entirely synthetic material. If researchers could engineer a scaffold that the body tolerates as well as its own dental tissue, the procedure would no longer depend on having a healthy canine tooth, and it could potentially be offered to many more patients.
Work in this area has focused on biomimetic composites, materials designed to mimic the structure and chemistry of natural bone. One approach uses a hydrogel polymer composite embedded with nano-crystalline hydroxyapatite-coated microspheres to replicate the mechanical and biological properties of the tooth-bone lamina.17PubMed Central. Biomimetic bone-like composites as osteo-odonto-keratoprosthesis skirt substitutes In plain terms, the material is engineered to feel like bone to the surrounding tissue while being strong enough to hold the optical cylinder. This research is still in early stages, and no synthetic substitute has yet replaced the tooth-bone lamina in clinical practice. But the direction is promising. If a reliable off-the-shelf lamina material emerges, it could eliminate the dental surgery component entirely and make some version of the procedure accessible to patients who currently have no options at all.
For now, OOKP remains a procedure defined by its unusual biological insight: that a piece of your own tooth, shaped with precision and implanted with care, can become the anchor for a window back to the world. The evidence accumulated over decades shows it works and lasts, particularly for the most difficult cases. The challenge going forward is making it available to more people and finding ways to simplify or replace the parts that make it so demanding for surgeons and patients alike.