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Results for “Ossicular Prosthesis”

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At least 19 recordsLinked to original sources
PubMed1992

[Histological studies of the behavior of the dentin ossicular prosthesis in the human middle ear].

The Dentine Ossicular Prosthesis (DOP)--introduced in the ENT-Department, University of Hamburg in 1986--has proved its worth clinically in more than 300 cases. In the meantime six of the prostheses had to be removed for various reasons. They had remained in the middle ear over a period between 2-5 and 47 months. The prostheses were investigated undecalcified by the Donath sawing and grinding technique. Prostheses in a nearly bland surrounding show a partial invagination in fibrous connective tissue without severe reaction of the prosthesis itself, whereas in prostheses removed from the neighbourhood of inflammatory processes or recurrent cholesteatoma a partial resorption of dentine with subsequent new bone formation could be observed. Due to the trouble-free clinical and histological performance in the human middle ear, the Dentine Ossicular Prosthesis can be well recommended as an alternative material in ossiculoplasty.

Adolescent↗
PubMed1986

Comparative study of the clinical results obtained by means of Plastipore and ceramic ossicular prosthesis and bone allografts.

We present a comparative study of the clinical and audiologic results obtained by means of Plastipore and ceramic ossicular prostheses and bone allografts in reconstructive middle ear surgery. We stress the excellent tolerance for ceramic and bone allografts in comparison to Plastipore. Functionally, the best results were obtained with partial prostheses using bone allografts and with total ceramic ossicular prostheses. Air-bone gaps less than 10 dB (37%) and 20 dB (69%) were achieved in patients with partial prostheses; in patients with total prostheses, 38% had an air-bone gap of less than 10 dB and 62% of less than 20 dB.

Biocompatible Materials↗
PubMed2001

In vitro evaluation of a malleus head to stapes head 'incus replica' prosthesis.

An ossicular prosthesis produced by making a mould from a cadaveric incus and injecting ionomeric cement into it (incus replica prosthesis, IRP) has been cemented to the malleus head and stapes head and evaluated in fresh human temporal bones using a laser vibrometer. Stapes velocity was recorded under acoustic stimulation and foot plate displacements were derived. Fourteen frequencies between 125 Hz and 8000 Hz have been used. Measurements were made with the ossicular chain intact, following removal of the incus, with the prosthesis cemented to the malleus, but not the stapes, and with the incudo-stapedial joint cemented. In a second series of experiments the performance of the IRP was compared with that of a Causse partial ossicular replacement prosthesis, using the same experimental set-up. The results indicate that the prosthesis performs almost as well as the intact ossicular chain and that cementing the incudo-stapedial joint gives better sound transmission than leaving it uncemented. In addition the IRP outperforms the conventional partial ossicular replacement prosthesis.

Bone Cements↗
PubMed2003

Tympano-ossiculoplasty utilizing the Spiggle and Theis titanium total ossicular replacement prosthesis.

OBJECTIVE: Since 1993, titanium prostheses have been used in Europe as a biocompatible implant for ossicular reconstruction. More recently, the titanium ossicular prosthesis has become more widely available in the United States as a newer means of surgical restoration of hearing. We will review the hearing results of patients who have undergone tympano-ossiculoplasty using a titanium total ossicular replacement prosthesis (TOP). We will compare these results to our previously published results using the porous polyethylene TOP. METHODS: Retrospective review in a tertiary otologic practice. RESULTS: Eighteen patients underwent tympano-ossiculoplasty with a titanium TOP. Among these patients, 10 cases involved revision of a previously placed ossicular prosthesis. Hearing results showed that 16 of 18 patients (89%) had closure of the postoperative air-bone gap to within 20 dB, and the average air-bone gap improvement was 23 dB. The average follow-up time was 8 months (range, 2-21 months). The results of this initial evaluation compare favorably with the results that we obtained using a porous polyethylene TOP in which 67% of 133 patients closed the air-bone gap to within 20 dB. CONCLUSION: We have recently begun using the titanium TOP, which has resulted in improved postoperative hearing when compared with the porous polyethylene TOP. In the future, longer follow-up and increased patient numbers will strengthen our conclusions.

Adolescent↗
PubMed1979

Experience with a polyethylene total ossicular replacement prosthesis.

Surgical reconstruction of ossicular defects in chronic middle ear disease is a difficult problem. We have reviewed our results with the use of the Plastipore total ossicular replacement prosthesis (TORP). Of 29 procedures that were analyzed, nine were considered successful. None of our patients had a stapes superstructure, and 13 had no malleus. Placement of the TORP under the malleus handle and use of extra tissue between the prosthesis and the tympanic membrane provided better hearing results, but extrusion of the prothesis still occurred. Positioning of the prosthesis and contraction of the middle ear space, which causes extrusion of the prosthesis, remain problems in this type of reconstruction.

Adolescent↗
PubMed1986

Ossiculoplasty failure with ceramic ossicular replacement prosthesis.

The stability of ceramic ossicular replacement prosthesis (CORP) in the middle ear was evaluated in 162 ears that had been followed for more than 18 months. The CORP extruded from 8 ears (4.9%) and was dislocated in 6 ears (3.7%). These failures were considered to be due mainly to postoperative tubal dysfunction and disease recurrence. CORP should not be used when such conditions can be anticipated.

Adolescent↗
PubMed1990

Design and development of a contoured ossicular replacement prosthesis: clinical trials of 125 cases.

A columellar ossicular replacement prosthesis has been developed to simplify ossiculoplasties. The hydroxylapatite head has flattened egg-shaped contours set on a teflon shaft. One hundred and twenty-five prostheses have been implanted and the results of eighty-two cases between five and eighteen months' maturity are presented. Sixty-six percent of good risk partial ossicular replacement prosthesis (PORP) cases achieved air-bone closure within ten decibels and eighty-five percent within twenty decibels. Of all total ossicular replacement prosthesis (TORP) and PORP cases, 51.5 percent closed to within ten decibels and 69.5 percent to within twenty decibels. The design has simplified the preparation and implantation techniques and the prosthesis can be used in most ossiculoplasty situations. A malleus handle is not required and interposition of cartilage is unnecessary. The simplicity of the prosthesis should provide particular benefits for the occasional or trainee otologist.

Clinical Trials as Topic↗
PubMed1991

A universal ossicular replacement prosthesis: clinical trials of 152 cases.

An ossicular replacement prosthesis is described that advances implant design in several respects. The head is a flattened egg shape, which eliminates pressure points against the pars tensa and provided balance on the stapes. Dense hydroxylapatite ceramic provides maximal biocompatibility. The shaft, of either Teflon or Plastipore, is easily cut to size and is replaceable to minimize wastage. Interchangeable partial or total shaft variants are provided. Trials in more than 200 patients have produced optimal results. Among 152 mature patients in 85% of the good-risk cases, the air-bone gap closed to within 20 dB and in 65% to within 10 dB; in 69% of all cases the gap closed to within 20 dB. Extrusion rates were 5% in good-risk cases and 7% overall. Long-term extrusions have not occurred. Inasmuch as cartilage interpositioning is unnecessary, the prosthesis is rapidly prepared and implanted by an easily mastered technique.

Bone Conduction↗
PubMed1988

Long-term observations on ceramic ossicular replacement prosthesis (CORP).

Long-term observations on the ceramic ossicular replacement prosthesis (CORP) were performed. Extrusion rates were 8.3% for CORP-P and 5.2% for CORP-T, with most extrusions occurring within 2 years. Hearing results were satisfactory. Air-bone gaps at 1 year were within 10 dB in 44.8% with CORP-P and 31.2% with CORP-T. At 3 to 5 years, air-bone gaps were within 10 dB in 42.2% and 33.3%, respectively. It was found that the short-term results were maintained even for the long period. Unsatisfactory hearing gains were caused mainly by the displacement or extrusion of CORP which could be prevented by fixation with the cartilage plate, deepening of the base of CORP-P, fixing of the base of CORP-T with the fascia, and additional fixing with the malleus handle and chorda tympani nerve.

Ceramics↗
PubMed2006

[Effects of ossicular reconstruction with partial ossicular replacement prosthesis in patients with tympanosclerosis].

OBJECTIVE: To evaluate the effect of ossicular reconstruction with partial ossicular replacement prosthesis (PORP) in patients with tympanosclerosis. METHODS: The data of 28 cases of tympanosclerosis treated between 1992 and 2006 were reviewed. Of the 28 patients, 14 (14 ears) underwent ossicular reconstruction with PORP and 14 (14 ears) had ossicular mobilization, and all the patients were followed-up for 3-24 months. RESULTS: Significant improvement was found in postoperative speech frequency (500, 1000, 2000 Hz) pure tone average (PTA) and air-bone gap (ABG) closure after in the operation the two groups. Ossicular reconstruction using PORP resulted in statistically better ABG closure and PTA (P<0.05). CONCLUSION: In ossicular attic fixation, ossicular reconstruction using PORP can yield better results than mobilization of the major ossicles in patients with tympanosclerosis.

Adolescent↗
PubMed2002

Hearing results with a hydroxylapatite/titanium bell partial ossicular replacement prosthesis.

OBJECTIVES/HYPOTHESIS: To study the preliminary hearing results in patients receiving a hybrid hydroxylapatite/titanium bell partial ossicular replacement prosthesis (PORP) and compare these with a cohort of patients receiving a HAPEX PORP. We hypothesized that the design of the hybrid PORP would enhance its acoustic properties. In particular, the titanium bell, which allows the prosthesis to be freestanding, would obviate the need for Gelfoam, preventing fibrosis. STUDY DESIGN: A retrospective study was made of two cohorts of patients. METHODS: A computerized otologic database was used to identify all patients implanted with either PORP. The four-frequency (500, 1000, 2000, and 3000 Hz) pure-tone average air-bone gap (PTA-ABG) and ABG values for individual frequencies were compared using the Student test. RESULTS: The PTA-ABG for the titanium bell prosthesis was 9.8 +/- 5.7 dB, compared with 13.2 +/- 8.3 dB for the HAPEX PORP, which was statistically significant ( P<.05). The average ABG values at 500 and 1000 Hz were also statistically significantly improved with the titanium bell PORP ( P<.05). CONCLUSIONS: The titanium bell PORP showed improved postoperative results for the PTA-ABG and at 500 Hz and 1000 Hz. The prosthesis is freestanding and may provide better coupling with the capitulum, factors which may lead to improved hearing results in the lower frequencies.

Adolescent↗