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At least 937 records · Page 52Linked to original sources
PubMed1980

Diminishing dependence on adhesives for retention of facial prostheses.

Attempts to augment or circumvent adhesives for retaining facial prostheses have been beneficial for many patients, particularly when a significant number of prostheses have failed because of insufficient retention. This approach is helpful in overcoming the problems created by the continued reluctance of surgeons to remove an entire facial organ in eradicating a relatively small disease process. There has been a positive response to suggestions that proposed surgery be planned to include the creation of sites which could be used for anatomic or mechanical retention.

Adhesives↗
PubMed1990

Differential effects of speech prostheses in glossectomized patients.

Five patients representing different categories of glossal resection were fitted with prostheses specifically designed to improve speech. Speech recordings made for subjects with and without their prostheses were subjected to a variety of analyses. Prosthetic influence on listeners' judgments of severity level/intelligibility, number of consonants in error, and on the acoustic measure F2 range of vowels was evaluated. Findings indicated that all subjects demonstrated improvement on the speech measures. However, the extent of improvement on each measure varied across speakers and resection categories. Implications of the findings for prosthetic speech rehabilitation in this population are discussed.

Adult↗
PubMed1991

Tissue compatibility of methylmethacrylate in cranial prostheses: a preliminary investigation.

An in vivo study using 48 disease-free male Lewis rats was conducted to determine the histologic difference between an alloplastic cranial prosthesis made with a monomer directly from the manufacturer and a triple-distilled monomer. The histologic difference in the tissue reaction between a cranial prosthesis sterilized with ethylene oxide and one sterilized with cobalt-60 irradiation was also evaluated. Histologic tissue biopsies of the cranium and brain tissues were obtained at 1, 3, 6, and 12 weeks. Tissue biopsies after the third week showed minimal inflammation and the microscopic findings were consistent with the reparative stage of wound healing. The findings also suggest that distillation of the monomer in heat-polymerized methyl-methacrylate is unnecessary for cranial prostheses. Cobalt-60 irradiation was found to be an effective alternative method of sterilization for such prostheses.

Animals↗
PubMed1992

An acrylic resin core for processing silicone facial prostheses.

A technique is presented for making an acrylic resin core for processing silicone facial prostheses. This technique ensures a durable core that can be used to make multiple prostheses. The core resists fungal growth during storage and creates a smooth, easily cleanable internal surface for a facial prosthesis. The core also permits a controllable thickness and therefore a lighter prosthesis.

Acrylic Resins↗
PubMed1986

Incorporation of microporous Teflon tracheal prostheses in rabbits: evaluation of surgical aspects.

Because tracheal prostheses made of nonporous silicone rubber develop granulation tissue at the anastomoses, we tested a prosthesis made of a microporous material (polytetrafluoroethylene, Teflon) to see whether this problem could be avoided and the prosthesis could be successfully incorporated (luminal side covered by connective tissue and epithelium). At various times after implantation in the cervical trachea of rabbits, the prostheses were inspected macroscopically for obstruction of the prosthesis lumen (lumen reduced by one-third or more) and microscopically for incorporation and inflammatory reaction (concentration of inflammatory cells) of the prosthesis. The prosthesis was successfully incorporated within 2-4 weeks in most rabbits without granulation tissue at the anastomoses. Two complications were infection of the prosthesis before incorporation was completed and obstruction of the lumen in the center of the prosthesis by granulation tissue or a deformed prosthesis wall. Both problems can be overcome, the first by giving an appropriate antibiotic for a longer period and the second by making a stiffer prosthesis. Thus, the microporous Teflon prosthesis is potentially useful as a tracheal prosthesis in rabbits.

Animals↗
PubMed1985

Implantation of penile prostheses in patients impotent after priapism.

Review of recent implantations of penile prostheses done at Duke University Medical Center reveals 6 patients implanted for impotence secondary to priapism. Of these 6 patients, 5 had sickle cell anemia-induced priapism and 1 had idiopathic priapism. One patient had implantation of an inflatable prosthesis later followed by a semirigid prosthesis, 3 had implantation of a semirigid prosthesis, and 1 had an unsuccessful attempt at implantation of a semirigid prosthesis. The 5 patients with successful implantation have obtained satisfactory postoperative coital function. We believe that penile prostheses are beneficial in patients with impotence secondary to priapism. The degree of fibrosis encountered suggests that a semirigid prosthesis is more favorable, since the inflatable prosthesis may not overcome corporeal rigidity.

Adult↗
PubMed1992

Low cost cosmetic hand prostheses.

66 patients with congenital or acquired amputations of the hand have been studied after fitting partial or complete silicone hand prostheses which can be manufactured at relatively low cost. Most patients used their prostheses on social occasions only and all but four expressed satisfaction with them.

Adolescent↗
PubMed1994

Comparative investigation on the biomechanical properties of ligament replacement in the sheep knee using six different ligament prostheses.

Six different ligament prostheses were implanted in 40 sheep to replace the anterior cruciate and medial collateral ligament of the right knee. After one year the explanted knee joints were tested for stability by measurement of the anterior drawer. Tensile tests on the ligament replacements were performed to determine the stiffness and rupture force of the replacement. Gross inspection of the knee joint showed abrasion and partial ruptures for all types of prostheses after one year. Depending on the type of prosthesis total rupture rates between 0 and 66% of all implants could be seen. The anterior drawer for the operated knee was 3-4 times higher than for the non-operated contralateral side. Neither the stiffness nor the rupture strength of the replacements reached the biomechanical properties of the normal ligaments.

Animals↗
PubMed2005

Zygomaticus implants for retention of nasal prostheses after rhinectomy.

Malignant tumours of the nose occasionally require rhinectomy. Implant retained prostheses can give good aesthetic results. Predictable biomechanical retention of nasal prostheses can be achieved using osseointegrated implants and Brånemark intra-oral and craniofacial implants have been used previously. Zygomaticus implants are traditionally used for dental rehabilitation of the partially edentulous maxilla with severe bone resorption. We describe two patients in whom zygomaticus implants have been used to aid salvage in prosthetic reconstruction of the nose.

Aged↗
PubMed2004

Preliminary functional results of tympanoplasty with titanium prostheses.

OBJECTIVE: To assess the use of titanium prostheses in tympanoplasty for reconstruction of the sound pressure and to evaluate the audiometric results obtained. STUDY DESIGN AND SETTING: and patients Retrospective chart review in a tertiary referral center. Between September 1998 and October 2000, 23 titanium middle ear implants (23 TORP) were used for reconstruction of the ossicular chain after tympanomastoidectomy. Preliminary functional results were obtained in 23 cases. RESULTS: Average follow-up time was 18 months (range, 12-40) and no adverse reactions or extrusions occurred. Seven of 16 canal wall down tympanoplasties (43.7%), and 3 of 7 canal wall up tympanoplasties performed (42.9%) had a postoperative air-bone gap of between 0 and 10 dB. CONCLUSIONS: Preliminary results show that titanium prosthesis provide a promising hearing result after total ossicular reconstruction, although long-term results are not yet available. The low weight of these prostheses may be the reason for the decrease in the air-bone gap.

Adolescent↗
PubMed2005

[Proposal for a new classification of prostheses used in the repair of abdominal wall hernial defects].

Research and development in new biomaterials is currently increasing. The greater use of prostheses for the repair of abdominal wall defects has meant that new designs incorporating novel materials are constantly emerging. Today's surgeon needs to be aware of these novel designs and become familiar with their use. In the present article, we classify the prostheses currently available on the market for the repair of abdominal wall defects, mostly hernias. The new classification scheme we propose takes into account the type of prosthesis, its components, and its ideal site of placement in the abdominal wall.

Biocompatible Materials↗
PubMed2006

[Prevention of peritoneal adhesions to intraperitoneal prostheses. An experimental study in pigs].

INTRODUCTION: The aim of this study was to investigate the effect of fibrin glue and hyaluronidase gel on the prevention of postoperative peritoneal adhesions to intraperitoneal prostheses. MATERIAL AND METHOD: Twenty pigs, divided in two groups, were included. In all animals, four implants (4 x 4 cm) were placed: two polypropylene mesh implants were placed in an upper location and two polytetrafluoroethylene (PTFE) implants (Dualmesh Plus Corduroy) were placed in a lower position. Implants located in the right side of the animals were painted with fibrin glue (group A, n = 10) or with hyaluronidase gel (group B, n = 10). After 5 weeks, the animals were sacrificed and the results (number and grade of intraperitoneal adhesions, histological data on prosthesis integration, such as mesothelialization, fibroblast infiltration, vessel neoformation, etc.) were evaluated. RESULTS: Intraperitoneal adhesions decreased in implants painted with fibrin glue and hyaluronidase gel compared with untreated implants. When right-sided adhesions formed, they were looser and in many animals, the implants were completely peritonized. Integration of the prostheses was not affected by either fibrin glue or hyaluronidase gel. CONCLUSIONS: Adhesion formation can be reduced after abdominal surgery. The reduction achieved in this study was greater in the quantity than in the consistency of the adhesions. The results with hyaluronidase gel were moderately superior to those obtained with fibrin glue. Hyaluronidase gel has the advantage of being inexpensive.

Animals↗
PubMed1996

An impression and cast construction technique for implant-retained auricular prostheses.

Implant-retained auricular prostheses present a challenge with regard to the esthetic placement of the margins of the prosthesis. A technique for the impression and master cast fabrication to produce an implant-retained auricular prosthesis is described. This technique allows control of the esthetic margin, fabrication of a durable master cast with planned blockout, and inclusion of a replica of the retentive bar, which allows processing duplicate prostheses without returning the retentive bar to the mold.

Ear, External↗
PubMed1996

A hybrid-mold technique for fabricating facial prostheses.

A hybrid-mold technique is described for fabricating facial prostheses with delicate contours and/or undercuts that require additional support. This quick and simple technique combines several common laboratory materials and protects select areas of the stone mold during prosthesis fabrication. This technique also extends the mold's years of service and the number of prostheses that can be fabricated from the mold.

Acrylic Resins↗
PubMed1997

Anterior margin adaptation for implant-retained auricular prostheses.

Adaptation of the anterior margin of implant-retained auricular prostheses may be compromised during mandibular movement. Loss of contact between prostheses and underlying skin in an esthetic area is of great concern. This article describes an impression procedure that addresses the problem of anterior margin adaptation.

Acrylic Resins↗
PubMed1997

Effects of implant anchorage on midface prostheses.

STATEMENT OF PROBLEM: Acquired midface defects may produce functional and psychologic impairments that adversely effects a patient's quality of life. Conventional prostheses may lack adequate retention and stability, diminishing the patient's confidence that the prosthesis will remain in place during routine activities. PURPOSE: The experience with and patient response to endosseous implants in prosthetic restoration of midface defects is presented in this study. MATERIAL AND METHODS: Five patients in age from 36 to 88 years were treated with 19 titanium endosseous root-form implants to provide retention and stability for prostheses. Patients responded to a questionnaire rating overall use, effectiveness, and satisfaction of their prosthesis, before and after the use of implants. RESULTS: All 19 implants were judged to be osseointegrated at abutment connection. Of the 17 implants used prosthetically, 14 (82%) remained osseointegrated and 3 (18%) failed. Analysis of the questionnaire tends to indicate an improvement of the quality of life for the patients with an implant-retained prosthesis.

Activities of Daily Living↗
PubMed1984

Indication and results of semirigid penile prostheses in spinal cord injury patients: long-term followup.

During the last 7 years semirigid intracorporeal penile prostheses were inserted in 36 spinal cord injury patients between 21 and 58 years old (average age 38.5 years). An operation was done 1 to 32 years after the initial injury (average 10 years). Surgical intervention was intended to provide an adequate body to the penile shaft so as to hold an external urinary drainage device in 11 patients, for treatment of sexual dysfunction only in 17 and for an external urinary drainage device plus treatment of sexual inadequacy in 8. Although a number of complications causing extrusion or removal of the prosthesis occurred in 6 patients (16.5 per cent), as well as an aborted operation in 1 (19.5 per cent), there were no permanent sequelae. Because of loss of sensation and vasomotor control, and pressure produced by the penile prosthesis spinal cord injury patients represent a higher operative risk than other patients without neurological or vascular impairments. In addition, urinary tract infection should not be overlooked as another major risk factor. Penile prostheses were most successful in maintenance of external urinary appliances in patients with a short or retractile penis. Whenever the prosthesis was intended for sexual intercourse an important prerequisite to a successful surgical outcome was the retention of some reflexogenic or psychogenic erection over and above the rods. Careful individual preoperative assessment is advised if a satisfactory result is to be achieved.

Adult↗
PubMed1983

Experience with semirigid rod and inflatable penile prostheses.

Between 1975 and 1980, 169 patients received a penile prosthesis. Followup for these patients ranges from 1 to 6 years. The following prostheses were implanted: 9 Small-Carrion, 13 Finney, 26 Jonas and 121 Scott. In the 48 patients receiving a semirigid rod prosthesis the only complication was a urethral erosion. In the 121 patients receiving an inflatable prosthesis the first 70 were implanted through a lower abdominal incision and 34 of these patients required a total of 63 revisions. The last 51 inflatable prostheses were implanted through a scrotal incision along with the use of rear tip extenders and 4 of these patients have required surgical revision.

Adolescent↗