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At least 55 records · Page 3Linked to original sources
PubMed1979

Presurgical infusion of Proplast: primate facial augmentation.

Presurgical infusion of Proplast (Vitek, Inc., Houston) with various solutions has been advoccated to enhance rapid ingrowth of tissue and stabilization of the implant. A comparison of Proplast blocks infused with saline solution, autogenous plasma, plasma with antibiotics, and control blocks was done after subperiosteal implantation in the maxillas and mandibles of primates. At specified time intervals from two to 66 weeks, implants were removed and examined for the character and degree of infiltration of tissue as well as for local cellular response to the alloplast. Microscopic examination of the implant showed increasing stabilization of tissue and decreasing local cellular response with increasing time of implantation. Examination of these parameters showed blocks infused with plasma to be least desirable.

Animals↗
PubMed1978

Mucosal grafting over Proplast-augmented edentulous ridges: a pilot study.

Full-thickness mucosal grafts were placed over Proplast-augmented alveolar ridges in six mongrel dogs. Five of the six grafts were successful, indicating that properly prepared recipient sites over Proplast provide adequate blood supply to support free grafts. A thicker keratinizing graft such as palatal mucosa may provide greater protection for the implant under the stress of a prosthesis.

Alveoloplasty↗
PubMed1982

Treatment of protracted bilateral mandibular dislocation with Proplast-Vitallium prostheses.

A case of bilateral protracted mandibular dislocation complicated by the presence of unusual degenerative changes in the temporomandibular joints is presented. A synopsis of treatment modalities that have been used previously to treat similar conditions is given. Our treatment consisted of bilateral condylectomies, eminectomies, and insertion of Proplast-coated Vitallium condylar prostheses. These procedures resulted in the re-establishment of normal TMJ anatomy, the maintenance of proper posterior mandibular vertical dimension, correction of malocclusion, and relief of the patient's symptoms.

Adult↗
PubMed1984

Proplast augmentation for posttraumatic zygomatic deficiency.

Facial deformities following fractures of the zygomatic complex are common. Included in this article are the indications, work-up, and surgical technique for placement of Proplast implant material to correct the deformity of the malunited zygomatic complex. Three cases are presented to illustrate this approach.

Accidents, Traffic↗
PubMed1990

A retrospective evaluation of 301 TMJ Proplast-Teflon implants.

A retrospective review of 301 meniscectomies with Proplast-Teflon implants was performed. Factors such as interincisal opening, occlusion, joint sounds, joint degeneration, and patient satisfaction were examined. The overall surgical success rate was 88.7%, with an average follow-up period of 33 months. Although many patients demonstrated significant condylar degeneration at 1-year follow-up, such change did not necessarily result in symptomatology or joint dysfunction. Only 10% of implants resulted in removal. Surgical and postoperative procedures are contrasted with those of other clinicians experiencing lower success rates.

Adolescent↗
PubMed1987

CT evaluation of TMJ disc replacement with a Proplast-Teflon laminate.

A series of 12 temporomandibular joints treated by discectomy and replacement with Proplast nonporous Teflon laminates were examined retrospectively using direct sagittal and coronal computed tomography. Radiographic findings included severe condylar, glenoid fossa, and eminence remodeling changes; implant migration and fragmentation; and loss of implant adaptation to the temporal bone. The radiographic changes generally occurred in patients who were completely asymptomatic clinically.

Adult↗
PubMed1990

Assessment of Proplast-Teflon disc replacements.

This retrospective study reports the findings in the follow-up of 31 temporomandibular joints in which Proplast-Teflon (Vitek Inc, Houston, TX) replacements were used. Among the problems noted were pain, malocclusion, restricted opening, and degenerative changes in the condyle and fossa.

Adult↗
PubMed1992

In vitro wear performance of Proplast TMJ disc implants.

This study investigates the in vitro wear performance of Proplast-Teflon Interpositional Implants (PTIPI; Vitek, Inc, Houston, TX), employing a mechanical TMJ simulator. Predictions of in vivo service life of PTIPIs are presented based on the in vitro wear testing data. Commonly employed laboratory testing methodologies are discussed in the development of alloplastic TMJ devices. Penetrative wear rates of the PTIPI at a 20-lb (9.1 kg) load were calculated to be 2.29 mm/100,000 cycles, yielding a predicted in vivo service life of PTIPIs of approximately 3 years. These results combined with reported clinical fate of this implant indicate that the intermediate- and long-term survival of this implant are uncertain.

Cartilage, Articular↗
PubMed1980

Proplast grafting: a new method for stabilization of maxillary advancements.

The various maxillary and other midface advamcement osteotomies have historically been fraught with the menacing complication of relapse. The traditional methods of attempting to compensate for the documented relapse potential incude advancement overcorrection and posterior grafting with freeze-dried bone or autogenous grafts from the iliac crest or rib. A new technique for grafting of advancement procedures with an alloplastic material, Proplast, is presented with a description of the procedure for its use and a discussion of the material's properties, advantages, and disadvantages.

Humans↗
PubMed1984

Enucleation with implantation of a proplast sphere.

Proplast, an inert carbon-Teflon alloplastic material, was tested as a primary spherical implant after unilateral enucleation in albino rabbits. The implants were removed at 3 months in three rabbits and at 6 months in the remaining three rabbits. Clinical observation confirmed a high degree of soft tissue fixation and no implant migration. The implant material submitted for light and electronmicroscopy showed extensive fibrovascular ingrowth throughout its matrix without encapsulation of the implant. Subsequent human use has shown good results in four patients followed for 2 years and an additional six patients followed for 1 year.

Animals↗
PubMed1993

In vivo deterioration of proplast-teflon temporomandibular joint interpositional implants: a scanning electron microscopic and energy-dispersive X-ray analysis.

The surgical treatment of internal derangements of the temporomandibular joint (TMJ) often involves disc removal. Alloplastic interpositional implants for disc replacement have been widely used to avoid the development of osteoarthritic changes in the TMJ. This study reports the in vivo wear characteristics of Proplast-Teflon (Vitek Inc, Houston, TX) interpositional implants (PTIPI) in 12 patients who had their implants for 13 to 71 (mean 54.6 +/- 5.8 SEM) months. In all cases, changes in the condyle and fossa were found resulting from resorption and replacement of the articulating bone by granulomatous tissue. All implants showed significant signs of wear, such as thinning, cracks, and tears, and overt perforations were seen in five cases. Scanning electron microscopy (SEM) combined with energy-dispersive x-ray microanalysis (EDAX) showed numerous microfragments of the PTIPI in the peri-implant soft tissues. Microfragments were demonstrated by their aluminum content. In addition to the inflammatory foreign-body reaction, it is suggested that there also were toxic and hypersensitivity reactions to aluminum involved in the pathogenesis of the bone destruction.

Adult↗
PubMed1993

Treatment outcomes for temporomandibular joint reconstruction after Proplast-Teflon implant failure.

A retrospective study of 107 patients (male, n = 13; female, n = 94) with 163 joints previously treated with Proplast-Teflon (PT; Vitek, Inc, Houston, TX) implants was performed. The average time in situ for the PT was 59.8 months (range, 2 to 126 months). Average length of follow-up was 84.6 months (range, 59 to 126 months). Only 12% of joints showed no significant osseous changes radiographically. Forty-five patients (42%) continue to have in situ PT implants and 36% of them experience pain that requires medication; 25% have developed an anterior open bite and malocclusion; 9% have limited vertical opening; and 40% are asymptomatic. Temporomandibular joint (TMJ) reconstruction after PT implant failure was performed with five different autologous tissues or a total joint prosthesis. Autologous tissues used to reconstruct the TMJ and the rates of success were as follows: 1) 31% free temporalis fascia and muscle graft with and 13% without sagittal split ramus osteotomy, 2) 8% dermis, 3) 25% conchal cartilage, 4) 12% costochondral grafts, and 5) 21% sternoclavicular grafts. The success rate decreased in all autologous tissue groups as the number of TMJ surgeries performed before reconstruction increased. Ankylosis was the most common cause of failure. Results of TMJ reconstruction with a total joint prosthesis were as follows: 1) 88% functional and occlusal stability of total joint prosthesis; 2) level of pain reduction was rated as 46% good, 38% fair, and 16% poor; and 3) an average interincisal opening of 27 mm at 24 months or less, and 33 mm at 25 months and beyond.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1989

Light and electron microscopic evaluation of Proplast II TMJ disc implants.

Proplast II disc implants (Vitek Inc, Houston) were used in nine patients (14 joints) who underwent discectomy of the temporomandibular joint (TMJ). These patients subsequently underwent removal of the implants from 10 to 28 months postplacement due to pain and occlusal changes or radiographic changes in the joints. Light and electron microscopic evaluations were performed on the retrieved implants and surrounding tissue. Evidence of gross deterioration manifested by fracture of the implant was present in 10 of the 14 implants, and microscopic evidence of deterioration was present in all implants. Foreign-body giant cell reaction in surrounding tissues and microfragmentation of the implant were evident in all joints.

Adult↗
PubMed1999

Self-reported systemic, immune-mediated disorders in patients with and without proplast-teflon implants of the temporomandibular joint.

PURPOSE: This study investigates the self-reported immune-related health status of patients exposed to Proplast-Teflon (P/T) temporomandibular joint (TMJ) implants, comparing their health status with a group of patients who were not exposed to any alloplastic TMJ implants. It also compares those whose implants were removed with those in whom they were retained. PATIENTS AND METHODS: Patients seen in a single oral and maxillofacial surgical practice completed a detailed self-report questionnaire about physical symptoms and disorders. Sixty-four had received P/T implants, and 22 were unexposed to any TMJ alloplastic implant. Of the P/T-exposed group, 44 had removed and 20 had retained implants. RESULTS: In general, P/T-exposed patients did not differ from unexposed patients in rates of reported immune-mediated and somatization-related conditions, allergies, or symptoms of environmental sensitivity. However, patients with removed P/T implants reported significantly more problems in all categories of conditions than those with retained P/T implants. This difference was no longer statistically significant after controlling for pain severity and sex. CONCLUSIONS: Although P/T-exposed patients do not report more systemic health conditions than similar patients who were unexposed to alloplastic jaw implants, those with removed implants report more conditions and are more likely to be seen in clinical practice. This may lead to a bias in the general perception regarding the systemic health status of P/T-exposed patients. In addition, effects may be secondary to high levels of pain and dysfunction among patients with removed implants, rather than implant exposure itself. Future prospective research is needed to identify factors associated with implant failure.

Adult↗
PubMed1980

Surgical-orthodontic correction of maxillary retrusion by Le Fort I osteotomy and proplast.

The combined efforts of the orthodontist and surgeon are necessary for successful treatment of most patients with maxillary retrusion. Both the aesthetic and functional manifestations of this dento-facial deformity can usually be effectively treated by maxillary advancement, augmentation of the midfacial region and orthodontics. Treatment planning, pre- and post-surgical orthodontic treatment principles, and surgical considerations in treating 25 adults with maxillary retrusion are described and illustrated. Surgical advancement of the maxilla by Le Fort I osteotomy, proper alignment of the teeth by orthodontics, and augmentation of the paranasal, canine fossae and malar regions with Proplast, were the common denominators of successful treatment.

Adolescent↗
PubMed1984

Proplast stabilized stemless trapezium implant.

Forty-five stemless Proplast-covered silicone rubber trapezium implants were used in 40 patients after trapeziectomy for either osteoarthritis, rheumatoid arthritis, or trauma. Three implants were later removed from two patients because of traumatic dislocations. One implant was removed from a patient after trauma because of persistent pain. Five patients were followed from 40 to 44 months; nine patients were followed from 31 to 39 months; 15 patients were followed from 20 to 29 months; six patients were followed from 14 to 19 months; five patients were followed from 6 to 9 months. The average follow-up time was 24 7/10 months. Before surgery 5% of the patients had continuous spontaneous pain, 35% of the patients had pain with all motion, and 60% of the patients had pain with limited normal daily use. At this time of our report, 65% of the patients are without symptoms, 21% of the patients have slight intermittent pain, and 14% of the patients have pain with strenuous use only. Tripod pinch improved 243% in male patients and 113% in female patients. All patients have good circumduction and metacarpophalangeal (MP) and interphalangeal (IP) joint motion. The stemless feature permits relatively free metacarpal joint motion without great stress being applied to the capsule that is covering the implant.

Arthritis, Rheumatoid↗