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Results for “Maxillofacial Prosthesis”

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At least 559 records · Page 31Linked to original sources
PubMed1994

Maxillofacial prosthetics: a preliminary analysis of Resource Based Relative Value Scale.

A study done by the American Academy of Maxillofacial Prosthetics to evaluate the Medicare Resource Based Relative Value Scale (RBRVS) as it relates to maxillofacial prosthetics. The method of RBRVS formulation is described. The degree of difficulty and treatment time were determined for nine Physicians' Current Procedural Terminology-edition 4 (CPT-4) codified maxillofacial procedures. A preliminary survey indicates that practice expense and malpractice expense ratios were 66% and 1%, respectively. Correlation of maxillofacial procedures to other medical procedures was not performed because an additional study with a greater sample size is needed.

Ear↗
PubMed1994

Physical properties of three maxillofacial materials as a function of accelerated aging.

This study compares the tensile strength, elongation, Shore-A hardness, and tear resistance of three silicone maxillofacial materials before and after aging to provide comparative data for evaluation of new or experimental elastomers. The materials evaluated were MDX-4-4210, Factor II (A-2186), and Cosmesil. Tests were conducted 24 hours after specimen preparation and were repeated after aging for 900 hours in a Weather-Ometer device. Five samples were made for each material under all test conditions. After testing, mean values were calculated for all materials under all test conditions and were compared by two-way analysis of variance and Tukey intervals at p < or = 0.05.

Analysis of Variance↗
PubMed1994

An assessment of the physical properties and biocompatibility of three silicone elastomers.

The physical properties of two room-temperature vulcanizing (RTV) silicones, A-2186 and Silbione 71556, and one high-temperature vulcanizing (HTV) material, Mollomed, were compared. The potential cytotoxicity of the silicone materials was assessed with the agarose overlay test. The properties that were investigated were tensile strength, percentage elongation, modulus, permanent set, tear strength, and hardness. The properties tested were selected because of their clinical significance for fabricating facial prostheses. The results of this study indicate that the A-2186 material has a better combination of high tear strength and elongation at break with a softer surface compared with Mollomed silicone, and Silbione 71556 silicone proved to be the weakest material. All materials demonstrated absence of cytotoxicity in the cell culture tests.

Analysis of Variance↗
PubMed1994

Effects of RTC-silicone maxillofacial prosthetic elastomers on cell cultures.

The use of a wide variety of materials in the construction of maxillofacial prostheses makes biocompatibility testing a necessity. However, the dental literature contains few reports of biocompatibility testing of maxillofacial prosthetic materials. The cytotoxic profiles of five room-temperature cross-linking (RTC)-silicone elastomers were investigated by means of two in vitro cell culture techniques. Mouse fibroblast cells (L929) were used, and the results indicated that RTC-silicone elastomers adversely affected cells in culture and that storage of samples for 1 week in saline solution did not alter this effect. Clinical follow-up of patients wearing prostheses made of these silicone materials is warranted to evaluate host reactions in long-term contact with human mucous membrane and skin tissue.

Animals↗
PubMed1990

Massive osteolysis of the maxillofacial bones. Report of two cases.

Two cases of massive osteolysis were encountered, one affecting the mandible and the other the maxilla and mandible. Only 13 cases have been reported so far in the existing literature for massive osteolysis of the mandible. It is indeed a rare disease. Our two cases were surgically treated and were clinically and histopathologically assessed.

Aged↗
PubMed1991

Boundary lubrication and maxillofacial prosthetic polydimethylsiloxanes.

Polydimethylsiloxanes exhibit hydrophobic behaviour and poor wettability. These features impose some problems with the clinical performance of the material when used for the construction of intraoral and extraoral facial prostheses. Surface active agents were added to modify the surface energy of the polydimethylsiloxane and contact angle measurements were carried out to observe wetting characteristics. Five siloxane-alkene oxide block copolymers, one organosilicon quaternary ammonium chloride and an epoxyalkyl silane ester were used as surfactants. The best surfactant in terms of permanency and contact angle lowering achieved a value of 24 degrees when added at 10% level compared with 57 degrees for the unmodified silicone. The fairly high viscosity, combined with a comb-like structure, together with the high hydroxyl number of 75 provided the correct balance of permanence and wetting characteristics.

Dimethylpolysiloxanes↗
PubMed1995

Hydroxyapatite-based porous aggregates: physico-chemical nature, structure, texture and architecture.

At the request of medical teams from the maxillofacial sector, a highly porous ceramic support based on hydroxyapatite of around 70-80% porosity was produced with a pore size distribution similar to bone texture (< 10 microns, approximately 3 vol%; 10-150 microns, approximately 110 vol%; > 150 microns, approximately 86 vol%). The ceramic substrates were conceived not only as a fillers for bone cavities, but also for use as drug dispensers and as supports to host cells to produce particular therapeutic agents. A method is suggested to obtain a substrate of high porosity, exploiting the impregnation of spongy substrate with hydroxyapatite ceramic particles. X-ray and scanning electron microscopy analyses were carried out to evaluate the nature of the new ceramic support in comparison with the most common commercial product; pore size distribution and porosity were controlled to known hydroxyapatite ceramic architecture for the different possible uses.

Biocompatible Materials↗
PubMed1995

Maxillectomy--to reconstruct or obturate? Results of a UK survey of oral and maxillofacial surgeons.

Post-maxillectomy defects may be restored either by surgical reconstruction or by prostheses and there is continuing controversy about the most appropriate method of rehabilitation in any particular case. A questionnaire was designed to assess the current practices of oral and maxillofacial surgeons in the UK after resection of the maxilla for malignant disease. Maxillectomies were carried out by 83% of surgeons; most surgeons do 1-5 cases a year; 38% of surgeons do reconstruct surgically, but only in 10% of cases. Only 65% of surgeons have access to the services of a restorative dentist; this did influence 19% of surgeons' decision about whether to reconstruct surgically or restore by prosthetic means.

Humans↗
PubMed1992

A study of some mechanical properties of an RTV polydimethylsiloxane for extraoral maxillofacial prostheses.

The construction of facial prostheses simulating the missing tissues as closely as possible is an imperative and demanding task. Such prostheses will be comprised of parts presenting different mechanical properties attempting to simulate facial tissues. In this study the mechanical properties of a room temperature vulcanized (RTV) silicone facial elastomer were modified, altering the molecular architecture by controlling the amount of cross-linking. A wide range of compliance was achieved which enables more lifelike facial prostheses to be made in clinical practice.

Cross-Linking Reagents↗
PubMed1989

Psychosocial responses to oral and maxillofacial surgery for head and neck cancer.

This study involved extensive interviews with 28 patients who had disfiguring oral and maxillofacial surgery for head and neck cancer. The patients, ages 42 to 76 years, had all been informed of their diagnosis and were in 2- to 5-year postoperative follow-up. Findings pertain to how patients deal with the interpersonal and social ramifications of diagnosis and surgical treatment. Fatalism, delays in help-seeking, responses to diagnosis, postsurgical anxiety, and adjustment were reported. Reassurance prior to surgery was sometimes found to limit understanding of postoperative impairment. Oral and maxillofacial surgeons were seen in heroic or imposing roles that impacted on their capacity to be supportive to patients coping with life change and "handicap." The patient treatment decisions were found to be determined by attitudes about death, which motivated patients and surgeons to make difficult or extreme choices. Suffering, social changes, and postoperative uncertainty were patient concerns. Patient strategies for adjusting to disfiguration are examined, and specific recommendations for the oral and maxillofacial surgeon are made.

Adult↗
PubMed1991

Extraoral application of osseointegrated implants.

The use of osseointegrated implants to provide support for craniofacial prostheses has provided the clinician with another approach to the treatment of complex craniofacial reconstructive problems. The surgical technique is reviewed and the Mayo Clinic experience is presented.

Adhesives↗