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Osteo-odonto-keratoprosthesis

AI overview

Osteo-odonto-keratoprosthesis (OOKP), also known as "tooth in eye" surgery, is a medical procedure to restore vision in the most severe cases of corneal and ocular surface patients.

Key points
  • The procedure involves removing a tooth from the patient or a donor and using it to construct an optical implant.
    source quote
    It includes removal of a tooth from the patient or a donor.
  • It was pioneered by Italian ophthalmic surgeon Professor Benedetto Strampelli in the early 1960s.
    source quote
    The procedure was pioneered by the Italian ophthalmic surgeon, professor Benedetto Strampelli in the early 1960s.
  • OOKP is performed as a two-stage operation.
    source quote
    OOKP is a two-stage operation
  • A longitudinal lamina is cut from the tooth, a hole is drilled and fitted with a cylindrical lens, then grown in the patient's cheek before implantation on the eye.
    source quote
    a longitudinal lamina is cut from the tooth and a hole is drilled perpendicular to the lamina. The hole is then fitted with a cylindrical lens. The lamina is grown in the patients' cheek for a period of months and then is implanted upon the eye.
Treatment
  • Stage 1 involves removing the inner surface of the eyelids, corneal surface and scar tissue.
    source quote
    The eye is opened up and the entire inner surface of the eyelids, corneal surface and all scar tissue is removed
  • Inner mucosal lining of the cheek is transplanted onto the new surface of the eye.
    source quote
    Inner mucosal lining of the cheek is transplanted onto the new surface of the eye
  • A canine or premolar tooth and part of the adjacent bone and ligaments are removed.
    source quote
    A canine or premolar tooth and part of the adjacent bone and ligaments are removed
  • A bolt-shaped structure is fashioned from the tooth-bone complex and fitted with a plastic optical cylinder.
    source quote
    A bolt-shaped structure is fashioned from the tooth-bone complex which is fitted with a plastic optical cylinder
  • The tooth-bone-cylinder complex is implanted into the patient's cheek to grow a new blood supply.
    source quote
    The tooth-bone-cylinder complex is implanted into the patient's cheek to grow a new blood supply
  • Stage 2 occurs about 4 months later; the cheek mucosal lining over the eye is opened and the inner contents of the eye are removed.
    source quote
    The cheek mucosal lining over the eye is opened and the inner contents of the eye are removed
  • The tooth-bone-cylinder complex is removed from the cheek and inserted into the eye, and the mucosal cheek lining is replaced over the implant.
    source quote
    The tooth-bone-cylinder complex is removed from the cheek and inserted into the eye, the mucosal cheek lining is replaced over the implant.
  • After the procedure, light enters through the plastic cylinder and the patient can see through it with good vision.
    source quote
    light can now enter through the plastic cylinder, and the patient is able to see through this cylinder with good vision.
Red flags
  • There is a significant long-term risk of anatomical failure of the lamina, estimated at 19% in a small study.
    source quote
    There is a significant risk of anatomical failure of lamina in the long term, estimated at 19% in a small study
Prognosis

Anatomical survival varies by study: 66% at 10 years in one comparative study, 85% intact OOKP at 18 years in a long-term study of 181 patients, and 94% anatomical survival up to 30 years in a 2022 retrospective study. Functional survival (visual acuity better than 1.30 logMAR) was 38% at 10 years in the comparative study, while the 2022 study reported 81% of eyes with visual acuity better than 1.00 logMAR at 10 years.

AI-synthesized from the Wikipedia article “Osteo-odonto-keratoprosthesis”. Not medical advice. Verify source →
Osteo-odonto-keratoprosthesis
SpecialtyOphthalmology

Osteo-odonto-keratoprosthesis (OOKP), also known as "tooth in eye" surgery,[1] is a medical procedure to restore vision in the most severe cases of corneal and ocular surface patients. It includes removal of a tooth from the patient or a donor.[2]

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After removal, a longitudinal lamina is cut from the tooth and a hole is drilled perpendicular to the lamina. The hole is then fitted with a cylindrical lens. The lamina is grown in the patients' cheek for a period of months and then is implanted upon the eye.

The procedure was pioneered by the Italian ophthalmic surgeon, professor in the early 1960s. Strampelli was a founder-member of the International Intra-Ocular Implant Club (IIIC) in 1966.[3]

An operation to graft the OOKP is undertaken in severe pemphigoid, chemical burns, Stevens–Johnson syndrome, trachoma, Lyell syndrome and multiple corneal graft failure.[4]

There is a significant risk of anatomical failure of lamina in the long term, estimated at 19% in a small study,[5] with the main risks being laminar resorption, particularly in allografts, and glaucoma.

Another, bigger study comparing OOKP with the lesser known osteo-keratoprosthesis (OKP) in 145 and 82 patients and follow-up terms up to 10 years yielded the following statistics:[citation needed]

  • 10-year anatomical survival: 66% for OOKP and 47% for OKP
  • 2-year functional survival (visual acuity better than 1.30 logMAR or 20/400 Snellen): 63% for OOKP and 49% for OKP
  • 10-year functional survival (visual acuity better than 1.30 logMAR or 20/400 Snellen): 38% for OOKP and 17% for OKP [6]

Another long-term study of 181 patients puts the chances of retaining an intact OOKP after 18 years at 85%.[7]

In 2022, a retrospective study conducted on 82 eyes with OOKP using original Strampelli technique, showed an anatomical survival of 94% up to 30 years of follow-up. The same study also reported a visual acuity better than 1.00 logMAR (or 20/200 Snellen) at 10 years in 81% of the eyes, and a visual acuity of 1.21 logMAR (or 20/324 Snellen) at 30 years.[8]

OOKP is a two-stage operation:[9]

Stage 1 of the surgery involves five separate procedures:

  1. The eye is opened up and the entire inner surface of the eyelids, corneal surface and all scar tissue is removed
  2. Inner mucosal lining of the cheek is transplanted onto the new surface of the eye
  3. A canine or premolar tooth and part of the adjacent bone and ligaments are removed
  4. A bolt-shaped structure is fashioned from the tooth-bone complex which is fitted with a plastic optical cylinder
  5. The tooth-bone-cylinder complex is implanted into the patient's cheek to grow a new blood supply

Stage 2 (about 4 months later) involves two separate procedures:

  1. The cheek mucosal lining over the eye is opened and the inner contents of the eye are removed
  2. The tooth-bone-cylinder complex is removed from the cheek and inserted into the eye, the mucosal cheek lining is replaced over the implant.

At the end of the procedure, light can now enter through the plastic cylinder, and the patient is able to see through this cylinder with good vision.[3]

The procedure was pioneered by the Italian ophthalmic surgeon Professor Benedetto Strampelli[citation needed] in Rome in the early 1960s.

The son of the geneticist and agronomist Nazareno Strampelli, Benedetto Strampelli held the chair of ophthalmic surgery at Rome's Ospedale di San Giovanni in Laterano where he was one of the first surgeons in Italy to transplant cornea. In 1953 he was the first Italian to implant intraocular lenses which were manufactured to his own design by Rayners in UK. Strampelli was a founder-member with Harold Ridley and Peter Choyce of the International Intra-Ocular Implant Club (IIIC) in 1966.[citation needed]

  1. ↑ "Tooth-in-eye (OOKP) Surgery Help 8 Regain Sight". www.ndc.com.sg. Archived from the original on 2008-03-04.
  2. ↑ Guidera, Anita (28 February 2008). "Son's tooth helps save dad's sight". Irish Independent.
  3. 1 2 National Dental Centre – 25 May 2005 Tooth-in-eye (OOKP) Surgery Help 8 Regain Sight Archived 4 March 2008 at the Wayback Machine
  4. ↑ Viitala R, Franklin V, Green D, Liu C, Lloyd A, Tighe B (January 2009). "Towards a synthetic osteo-odonto-keratoprosthesis". Acta Biomater. 5 (1): 438–52. doi:10.1016/j.actbio.2008.07.008. PMID 18706878.
  5. ↑ Liu C, Okera S, Tandon R, Herold J, Hull C, Thorp S (September 2008). "Visual rehabilitation in end-stage inflammatory ocular surface disease with the osteo-odonto-keratoprosthesis: results from the UK". Br J Ophthalmol. 92 (9): 1211–7. doi:10.1136/bjo.2007.130567. PMID 18511541. S2CID 26716899.
  6. ↑ Michael R, Charoenrook V, de la Paz MF, Hitzl W, Temprano J, Barraquer RI (August 2008). "Long-term functional and anatomical results of osteo- and osteoodonto-keratoprosthesis". 246 (8): 1133–7. doi:10.1007/s00417-008-0850-3. PMID 18491123. S2CID 13019199.
  7. ↑ Falcinelli G, Falsini B, Taloni M, Colliardo P, Falcinelli G (October 2005). "Modified osteo-odonto-keratoprosthesis for treatment of corneal blindness: long-term anatomical and functional outcomes in 181 cases". Arch. Ophthalmol. 123 (10): 1319–29. doi:10.1001/archopht.123.10.1319. PMID 16219722.
  8. ↑ Iannetti L, Liberali M, Armentano M, Alisi L, Visioli G, Mastromarino D, Edoardo B, Iannetti G (May 2022). "Osteo-odonto-keratoprosthesis according to Strampelli original technique: A retrospective study with up to 30 years of follow-up". Am J Ophthalmol. 242: 56–68. doi:10.1016/j.ajo.2022.05.015. hdl:11573/1635748. PMID 35618023. S2CID 249035286.
  9. ↑ Ricci R, Pecorella I, Ciardi A, Della Rocca C, Di Tondo U, Marchi V (April 1992). "Strampelli's osteo-odonto-keratoprosthesis. Clinical and histological long-term features of three prostheses". Br J Ophthalmol. 76 (4): 232llll–4. doi:10.1136/bjo.76.4.232. PMC 504235. PMID 1390492.