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PubMed1983

Tympanosclerosis.

Explore the source record for details and available documents.

Collagen↗
PubMed1980

Porps, torps, and homografts in tympanoplasty.

A brief review of the use of plastique prostheses in ossiculoplasty, as well as the use of homograft tympanic membranes along with our experience is reported. Plastipore prostheses have been found to be useful, and their continued use is advocated. Homograft tympanic membranes are useful in repairing those ears which have undergone extensive damage to the tympanic membrane and ossicles.

Biocompatible Materials↗
PubMed1994

Ossiculoplasty with composite prostheses. PORP and TORP.

This article discusses the design of a composite prosthesis developed from a desire to combine the advantages of two synthetic materials. Hydroxyapatite can be used directly against the tympanic membrane, and Plastipore can be easily trimmed intraoperatively. The need for any human tissue can be eliminated; hearing results and extrusion rates appear comparable to other implants commonly used.

Biocompatible Materials↗
PubMed1994

Ossiculoplasty with semibiologic and composite prostheses.

The Lippy-modified Robinson prosthesis has been used for years in revision stapedectomy and has proved successful in reconstructing the absent lenticular process. When this technique fails, an ossicle cup prosthesis can be used. The ossicle cup and columella have been used for 20 years with continuing success. The advantages of the semibiologic prostheses are as follows: The prosthesis can be sized as each case requires, giving a variable height above the remaining stapes. The prosthesis is designed not to touch the promontory or facial nerve canal. The synthetic portion of the semibiologic prosthesis does not touch the tympanic membrane. An efficient perpendicular action is achieved from the tympanic membrane to the stapes footplate. The prosthesis remains in place during tympanic membrane movement. A stable dynamic joint is provided with the stapes capitulum (ossicle cup). A safe platform is provided that distributes the weight of the assembly prosthesis over the entire stapes footplate (ossicle columella). Although both semibiologic prostheses are used routinely for partial and total ossicular replacement, other troublesome and technically difficult ossicular reconstruction problems can also be solved by the adaptability of the synthetic portion of the prosthesis. Because the synthetic portion of the prosthesis can be modified by notching, shaping, and trimming, the following problems can be overcome: A laterally healed tympanic membrane can be reached by increasing the length of the synthetic shaft. In the absence of the stapes capitulum, the cup is notched in two places (180 degrees apart) to fit the shoulders of the remaining stapes. Remaining crura on the footplate can be bypassed by trimming the synthetic footplate to fit in between the crura. The stapes with a low profile can be utilized by increasing the length of the synthetic shaft. An abnormal stapedial tendon attachment to the stapes capitulum can be overcome with a single notch in the cup. An overhanging facial nerve can usually be bypassed by the narrow design of the ossicle columella. The future of ossiculoplasty will rest more on the solution of ancillary problems than on ossiculoplasty techniques. These troublesome ancillary problems include eustachian tube dysfunction, cholesteatoma control, mucosa regeneration, and fibrosis during the healing process. The self-correcting process of ossiculoplasty is an evolutionary process, and the small surgical steps taken are slowly incorporated into surgical principles. Incorporating a synthetic prosthesis within a natural or synthetic ossicle is a logical and evolutionary step in the science of ossicular reconstruction.

Biocompatible Materials↗
PubMed1994

Ossiculoplasty with polymaleinate ionomeric prostheses.

This article discusses the role of the new Ionomeric middle ear prostheses for ossicular chain reconstruction. Although the prostheses are composed of a rigid alloplastic material, they can be easily sculpted to conform to the middle ear anatomy.

Aluminum Silicates↗
PubMed1994

Total reconstruction of the ossicular chain.

The footplate only situation remains the greatest challenge of ossicular reconstruction. This article discusses the long term results obtained with a new type of columella, the Spandrel, which combines the rigidity necessary for sound transmission with the flexibility required to comply with the dynamic movements of the neotympanum.

Audiometry, Pure-Tone↗
PubMed1994

Histopathology of ossicular implants.

Ossicular and cortical bone grafts maintain their morphologic structure for long periods of time and show varying amounts of replacement of nonviable bone by new bone through a slow process of creeping substitution. Cartilage grafts develop chondromalacia, lose stiffness, and tend to be resorbed over time. Plastipore prostheses elicit foreign body giant cell responses with microscopic biodegradation of the implants. There is a great need for the study of well-documented human temporal bone cases with in situ ossicular implants.

Adolescent↗
PubMedDate not supplied

[Bioceramic prosthesis of the ear ossicles in tympanoplasty].

Anvil bones bioceramic prostheses were used in tympanoplasty performed in 60 patients with chronic otitis media purulenta (COMP). Complete and partial variants of the prostheses were tried. Follow-up results available for 60 patients demonstrate that the above tympanoplasty improved hearing in 41 out of 60 patients, made possible complete cavity epidermization, arrested inflammation, secured safety of the tympanic transplant in 51 patients. Bioceramic prostheses of the anvil bones provide stable hearing improvement even in COMP cases with severe impairment of the anvil bones.

Acute Disease↗
PubMed1997

Long-term results of glass ionomer cement, Ionocem, in the middle ear of the rat.

Long-term results of glass ionomer cement, Ionocem, in the middle ear of the rat. An ionomeric cement (Ionocem), a new bone replacement material, was used for obliteration material of the mastoid cavity in the rat. Iononcem is biocompatible, biostable and in most of the cases well tolerated by bone and soft tissues. The bone cement was implanted in the left mastoid cavity of 17 rats. After periods of 3 and 12 months, 6 animals from each time interval were sacrificed and the mastoids were studied and compared with the unimplanted right ears. Five animals died of a middle ear infection. In the middle ears of the rats sacrificed after 3 months no abnormalities were observed but after 12 months in all implanted ears a granular tissue reaction around the glass ionomer cement was found. In some of these cases the cochlea was destroyed as well. The results of this animal experiment indicate that glass ionomer cement is not the material of first choice for obliterating the mastoid cavity.

Animals↗