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At least 937 records · Page 52Linked to original sources
PubMedDate not supplied

A study of acrylic resin denture base material distortion using computer-aided holographic interferometry.

A holographic interferometer for investigating deformations of dental prostheses is described. Residual stress relaxation resulting from the polymerization of acrylic resin dentures is qualitatively studied during the first 48 hours following fabrication. The resulting fringe patterns show a symmetry that is correlated to the shape of the denture. A quantitative analysis of the interferograms was performed with the aid of a computer program. The computer-aided holographic interferometer was tested using disk-shaped acrylic resin materials. Dimensional deformations resulting from temperature changes were measured with an accuracy better than 0.2 microns. Because of the aging of the resin material, the reaction to temperature changes may differ as a function of time and may be studied using quantitative comparison of deformation plots. For convenience, the original object shape can be added to or subtracted from the graphical deformation data.

Acrylic Resins↗
PubMed1991

The dynamics of distribution and excretion of butyl-(2,3-14C)-acrylate in male Wistar albino rats.

The disposition of butyl-(2,3-14C)-acrylate has been studied following intraperitoneal and oral administration to rats. Most of the administrated acrylate underwent rapid metabolism and excretion with expired air (more than 70% of the dose) and urine (15-22%). Most of 14C found in tissues was associated with the liver and kidneys. The level of 14C associated with most of the examined tissues remained unchanged, at least, for the first 8-10 hours, followed by its fairly rapid loss. The only exception was erythrocytes, fat and the sciatic nerve. Significant differences in the rate of 14C loss from tissues were found in relation to the route of its administration.

Acrylates↗
PubMed1991

Comparison of the adaptation of acrylic resin cured by microwave energy and conventional water bath.

Acrylic resin record bases made from three commercial resins were processed by water bath curing and by microwave energy. The adaptation of the record bases to a standard cast was measured to determine if there were any statistically significant differences in the fit that could be attributed to the differences in curing methods and the brands of resin. The results indicated a small statistically significant difference in favor of the water bath cure overall, but clinically there were no appreciable differences in the adaptation of the record bases with either curing method or the resins used. The adaptation of artificial dentures made from acrylic resin is clinically acceptable with either microwave curing or the water bath method.

Acrylic Resins↗
PubMed1990

[Clinical indications for acrylic partial denture design].

The article deals with the planning of different acrylic dentures, i.e. immediate and temporary denture, transitional denture and overdenture as definitive oral rehabilitation. A case where on a single molar a telescope crown and an Ipsoclip anchor were used is described. By an Ipsoclip anchor an additional retention was provided. To achieve a successful treatment with an acrylic partial denture the use of a surveryer is obligatory. Besides that, instead of wire made, elements for support and stabilization cast of semiprecious and non-precious alloys also give much better results.

Acrylic Resins↗
PubMed1990

[An evaluation of the bond strength of plastic teeth to acrylic denture base material].

Plastic teeth are preferred as functional portions with acrylic denture base material. The resin teeth have become the integral part of the denture by their chemical bonding with the base. But several factors effect the bonding: faulty boil-out procedures, residual wax on ridge-laps of the teeth, careless application of tin-foil substitutes to the teeth. On the other hand, grinding the glossy ridge-lap surface, painting the teeth with monomer or a solvent, preparing retention grooves on the ridge-lap portion of the teeth effectively lock the teeth to the denture base. The purpose of this research was to evaluate the bond strengths of the acrylic resin teeth and denture base material with retention grooves on the ridge-lap portion of the teeth. As a result of this study, bond strength between resin teeth and the denture base material is increased by the mechanical retention applied on the ridge-lap portion of the teeth.

Acrylic Resins↗
PubMed1990

The influence of molecular weight distribution of poly(acrylic acid) on tensile bond strength of polycarboxylate cement.

The influence of the weight average molecular weight and the molecular weight distribution of poly(acrylic acid) on the tensile bond strength of polycarboxylate cement was studied. The bond strength of the cement significantly affected not only the mean molecular weight but also the distribution. The tensile bond strength of the cement prepared from an aqueous solution of poly(acrylic acid), which had a mean molecular weight above 100,000 and a narrow molecular weight distribution, was excellently high.

Acrylic Resins↗
PubMedDate not supplied

[Resistance and deformation of acrylic resin reinforced with cut and ground fiberglass. 1. Rupture tension].

Traction trials were carried out on acrylic resin test bodies for denture frames reinforced with cut and ground fiberglass, to determine rupture tension. The results demonstrated that: 1--Cut fibers tend to increase the resistance of acrylic to traction forces, and the increase in load percentage of these fibers also increase resistance. 2--This increase was more marked when treatment with SILANE A 174 was combined with the use of cut fibers, at all concentrations tested.

Acrylic Resins↗
PubMed1990

In vitro study on the inhibiting effect of different agents on the growth of Candida albicans on acrylic resin surfaces.

This study evaluated at the in vitro level the antifungal effectiveness of nystatin, chlorhexidine, and a homologous histidine polypeptide on the surface of acrylic resin disks. The agents were used in a way that simulated storage of a denture by a denture wearer. Results indicated that pretreatment with poly-L-histidine was not protective against C albicans adherence and growth regardless of whether disks were stored in water or in the open air for the 8-hour period following yeast contamination. Chlorhexidine was totally effective in preventing C albicans attachment to, and growth on, the acrylic resin, even after a period of 8 days of turbidimetric monitoring. Pretreatment with Nystatin, followed by drying, was protective, yielding results similar to those obtained with chlorhexidine.

Acrylic Resins↗
PubMed1989

[New acrylic resins with very low residual monomer].

New experimental acrylic resins were prepared by polymerization of MMA in the presence of vinylidene fluoride/hexafluoropropylene copolymer. The amount of residual monomer in the resins prepared by visible light curing, cold curing, and heat curing, at various polymer/monomer ratios, was measured and compared with the usual MMA/PMMA resin. In the visible light cured resins containing 60 or 70 wt% of the fluoropolymer, the amount of residual monomer was less than 0.1%. In the cold cured resins, the amount of residual monomer was very low: 0.2% and 0.7% for the resins containing 70 and 60 wt% of the polymer, respectively. These values were comparable to the usual heat cured MMA/PMMA resins. In the heat cured resins, the amount of residual monomer was the lowest; less than 0.1%, even in the resin consisting of 50 wt% polymer. Thus, we prepared new acrylic resins with much less residual monomer than the usual MMA/PMMA resins.

Acrylic Resins↗
PubMedDate not supplied

[Passivity of certain disinfectant substances in the presence of acrylic resins].

On the basis of data published in the specialized literature the authors have experimented the effects of five substances currently used for the disinfection of prostheses. These included: Denclen (a British product), Super Quick's (made in the FRG), and Leodent also a West German product), as well as two general disinfectants of the buccal cavity: perogen and bromocet, on the acrylic resins used for the dental prostheses: Superpont (made in Czechoslovakia) and Romacryl (a Romanian product). The study showed that these substances, both the special ones and the general disinfectants are not completely passive when in contact with the acrylic prostheses. They should be used with care, and in accordance with the indications concerning concentration and duration of application.

Acrylic Resins↗
PubMed1989

A functional acrylic periodontal veneer (case report)

Acrylic periodontal veneers were recommended to improve - aesthetics following periodontal surgery, especially when there is considerable apical movement of the gingival margin with subsequent exposure of roots (L'Estrange and strahan 1970). The present report is a case of a young sudanese lady, 30 years old, who presented with severe gingival recession on the lingual surface of 21/12 with subsequent exposure of the roots as a result of inflammatory periodontal disease. The exposed roots were sharp enough to cause a traumatic ulcer at the tip of the tongue. Healing of the ulcer was only attainable following construction of an acrylic periodontal veneer to cover the sharp roots and was placed on the lingual surface of 21/12. The patients acceptability to the veneer was excellent and encouraging.

Acrylic Resins↗
PubMed1989

[Corrosion of a dental acrylic resin by alkaline peroxide used for cleaning].

Some clinical observations have brought the authors to suspect a corrosion of acrylic resins by an alcaline peroxide (Steradent) proposed as a denture cleanser. By way of a laboratory simulation they have shown that standardized samples of Lucitone 199 are corroded by the main active agents issuing from Steradent: oxygen and a high level of alcalinity. A daily use of Steradent can thus badly affect the physical properties of denture acrylic bases.

Acrylic Resins↗
PubMed1986

Biotolerant and haemodynamic effects of copolymerization with acrylic acid on Dacron arterial prostheses.

The biotolerant and haemodynamic effects of three types of woven polyethylene terephthalate (Dacron) arterial prostheses were compared. Two of these were unmodified, one low, one high porosity; and the third was the latter type radiation graft copolymerized with 5% acrylic acid. The prostheses were implanted as aorto-aortic bypass grafts, in dogs, for periods ranging from three to seventeen months. The copolymerized prosthesis exhibited the smallest rise in circumferential elastance from the 'as supplied' state, as well as a significantly slower pulse wave velocity, a significantly thinner internal lining, and a markedly lower longitudinal impedance. Of the unmodified prostheses, the low porosity graft had a significantly greater circumferential elastance, the poorest handling characteristics, and a tendency for pseudo intimal detachment. It was concluded that, although there was little difference between the two unmodified prostheses, the low porosity one had little to recommend it for use in small calibre bypass grafting. Copolymerization with acrylic acid produced better haemotolerant and haemodynamic results as well as surface properties which appeared to discourage fibrin and platelet adherence, and promote a more complete and organised pseudointima.

Acrylates↗
PubMed1985

A 30-year follow-up and failure analysis of a Fixel acrylic femoral prosthesis.

An acrylic-headed prosthesis was removed after 30 years and analyzed for material deterioration. Although the acrylic head showed some wear and minor corrosion of the cobalt-chromium stem was found, tissue responses were not significant, indicating that use of these materials is consistent with the long-time survival of a prosthesis.

Acetabulum↗
PubMed1979

[Effect of copolymers of N-vinylpyrrolidone and acrylic acid on individual stages of immunogenesis].

The analysis of NA-5 and NA-6, copolymers of acrylic acid and N-vinylpyrrolidone obtained by the method of radical copolymerization, indicated that these copolymers, while having no toxicity characteristic of polyacrylic acid known to be a powerful agent for stimulating immunogenesis, increased the migration of stem cells, and the processes of T and B lymphocyte spreading, as well as sharply enhanced the effect of interaction between T and B lymphocytes and partially replaced the helper function of T cells; all these actions finally enhanced immune response in the body. A decrease in the toxicity of copolymers was found to be in linear relationship with the percentage of the links of acrylic acid, whereas the adjuvant activity of the copolymers remained unchanged.

Acrylates↗
PubMedDate not supplied

Reconstruction of the chest wall after full thickness resection: a comparison between myocutaneous flap and acrylic resin plate as reconstructive techniques.

Thirty-three patients with chest wall malignancies underwent full thickness resection of the chest wall and immediate reconstruction of the defects with either synthetic materials (acrylic resin plate, 16 patients) or with myocutaneous flaps (rectus abdominis flaps, 17 patients). Although the acrylic resin plate proved to be excellent for maintaining stability of the chest wall, five patients suffered from local skin necrosis, requiring skin grafting, and four suffered from persistent foreign body reactions, necessitating ultimate removal of the plate. The patients receiving myocutaneous flap repair had excellent wound healing, acceptable rigidity of their chest wall, and no foreign body reactions throughout the follow-up period. The 50% post-operative survival time for the entire series was 29 months, suggesting that the procedure in an effective treatment modality for breast cancer involving the chest wall. Reconstruction with a myocutaneous flap is indicated as long as the chest wall defect is not too extensive.

Acrylic Resins↗
PubMed1986

Improvement of prolactin immunolabelling in osmium-fixed acrylic-embedded pituitary gland.

Immunolabelling of prolactin (PRL) with protein A-colloidal gold complex and tissue fine structure were enhanced after postfixation of pituitary gland with osmium tetroxide and embedment in acrylic momers (LR White). Thin sections were treated with sodium metaperiodate before immunocytochemistry. An intense PRL labelling was detected in secretory granules, Golgi complexes and extracellular accumulation of the hormone. The use of osmium greatly improved the fine structure of the tissue and its stability during acrylic embedment.

Acrylates↗