Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “SILICATE CEMENT”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 289 records · Page 16Linked to original sources
PubMed1977

Pulpal response to a new visible light-cured composite restorative material: Fotofil.

A new visible light-cured composite resin, Fotofil, has been developed for the esthetic restoration of anterior teeth. The pulpal responses elicited by this material in unlined cavities and cavities lined with Dycal were compared with those elicited by a negative control consisting of modified zinc oxide-eugenol cement Notebec and a silicate cement Syntrex. The pulpal responses were evaluated in the permanent maxillary and mandibular incisors in vervet monkeys using labial Claterial in each monkey. Groups of 10 monkeys were killed at intervals of 2 days, and 2 and 8 weeks after restoration of the teeth. The most severe pulpal responses were elicited by the unlined Fotofil and Syntrex restorations at all three time intervals. The Dycal lined Fotofil restorations elicited a milder pulp response than the Nobetec at 2 days and 2 weeks. No pulpal response was elicited by the latter two materials at 8 weeks. These results clearly showed that Fotofil and Syntrex are irritant to the dental pulp up to 8 weeks. The placement of a Dycal liner beneath Fotofil restorations reduced the pulpal irritation elicited by this material to levels which were lower than those elicited by the Nobetec control at 2 days and 2 weeks.

Animals↗
PubMed1980

The structure of experimental in vitro lesions around glass ionomer cement restorations in human teeth.

Class V cavities were prepared at the amelo-cementum junction in sixty-eight extracted human teeth. Fifty-one were filled with glass ionomer cement (ASPA). 'Secondary carious' lesions were produced around thirty-five of the restorations by exposure to acidified gelatin. Thirty-three teeth served as controls of the effect of the preparation procedure, the conditioner, the ASPA liquid and the filling material proper on the cavity walls. Sixty 120 micrometers-thick longitudinal sections from the teeth with the restorations in situ were studied by polarized light microscopy and microradiography. The glass ionomer cement caused by itself a narrow zone of increased radiopacity in the dentine cavity wall. The 'secondary caries' pattern consisted of a subsurface outer lesion and a subsurface wall lesion as observed previously in corresponding experiments with silicate fillings. Outer lesions in enamel were more frequent than with silicate cement. In the cementum all the experimental teeth showed outer lesions. The wall lesions extended only slightly beyond the level of erosion of the restorations. Between the wall lesions (in dentine) or outer lesions (in cementum/dentine) and the surface of the cavity wall, a zone of increased radiopacity was found, assumed to be due to reprecipitation of Ca and P promoted by release of fluoride from the filling material.

Acid Etching, Dental↗
PubMed1978

An in vitro study of certain properties of a glass ionomer cement.

A glass ionomer cement was tested for its release of fluoride, effect on solubility of enamel, bond to enamel, and ability to seal the cavity. It was comparable to silicate cement in its release of fluoride and its effect on solubility of enamel. The strength of the bond of the cement to tooth structure was similar to polycarboxylate cement, and it appeared to be quite effective in sealing cavities.

Acrylic Resins↗
PubMed1982

NMR spectroscopy of dental materials. I. 31P studies on phosphate-bonded cement liquids.

Phosphorus-31 nuclear magnetic resonance spectroscopy of phosphoric acid solutions containing zinc and aluminium indicates that zinc forms simple salts in solution, whereas aluminium forms a number of complexes, some of which are polymeric. The formation of the aluminophosphoric acid complexes controls the gelation and strengthening of the dental silicate cement and prevents the formation of crystalline zinc phosphate in the zinc phosphate cement.

Aluminum↗
PubMed1980

Fluoride distribution in teeth using a silicate model.

The fluoride determinations were done on enamel biopsies taken before and after restoration of extracted teeth with silicate cement. Two sites, one near the restoration and one 3 mm or more away from the restoration, were assayed. No difference was noted in pre- and post-restoration biopsies when teeth were restored with a fluoride-free silicate. Post-restoration biopsies at sites near and away from the restoration were significantly higher in fluoride as compared to pre-restoration biopsies when the teeth were restored with a fluoride-containing silicate.

Dental Cements↗
PubMed1986

Restorative treatment pattern and longevity of resin restorations in Denmark.

A survey has been made of the reasons for placement and replacement of 883 resin restorations in Denmark. In patients more than 16 years of age 39% of all restorations were made because of primary caries, and 61% were replacements of failed restorations. In primary teeth 63% and in permanent teeth of children 65% of the restorations were made because of primary caries. The reasons for replacement of restorations were dependent on dentition, age of the patient, and type of restoration. Secondary caries, loss of fillings, and marginal discrepancies were the most frequently recorded reasons for replacement of failed resin restorations. The age of the restorations replaced ranged from 0 to 15 years, and half of the replaced resin restorations in adults were just over 6 years old. In permanent teeth in children half of the failed restorations were replaced within 2 years, whereas half of those in primary teeth were replaced within 1 year. Information on a selected material of old silicate cement restorations in adults showed that two-thirds of these were replaced owing to marginal discrepancies and lost fillings.

Adolescent↗
PubMed1979

A method for toxicity screening of biomaterials using cells cultured on millipore filters.

In the present paper a tissue culture technique is described whereby the toxicity of setting and solid materials may be evaluated. A cell monolayer was established on a millipore filter which was placed on an agar medium, cell side down. Test specimens were placed on top of the millipore filter and were allowed to influence the cells through the filter for two hours. The cell reaction was assessed by incubating the cells, still adherent to the filter, for the demonstration of succinate dehydrogenase activity. Materials with a cytotoxic effect caused a zone of inhibited enzyme activity in the cell-material contact area. The filters were examined macroscopically and scores from 0 to 3 were given to grade the severity of the cell response. Unset and set silicate cement, zinc phosphate cement and an acrylic resin were tested. The results obtained were consistent and in accordance with those of previous reports. The method was simple and rapid and appeared suitable for the assay of larger test series.

Animals↗
PubMed1979

[Clinical studies for the evaluation of the composite filling material Evicrol].

339 Evicrol fillings were clinically re-examined 0,52 to 2 years after insertion. The comparison of the results obtained with those from silicate cement fillings (Hildisch) evidenced that the properties of Evicrol are better. In assessing Evicrol for a prolonged period, special attention must be paid to the higher percentage (18--33%) of discolourations appearing already within 1--2 years.

Composite Resins↗
PubMed1976

[Indications for and evaluation of filling therapy].

An explanation of the goal of filling therapy is followed by guidelines relevant to the indications for plastic fillings (silver-tin amalgam, silicate cement, composites) and inlays (metal and porcelain inlays) with special regard to the properties of the filling materials (colour, chemical and physical properties), the extension of the cavity and the condition of the pulp. Practice-oriented conclusions mark the end of the paper.

Composite Resins↗
PubMed1977

Biologic evaluation of filling materials. A comparison of results using cell culture techniques, implantation tests and pulp studies.

The paper presents a comparison of results from cell culture studies, implantation tests and pulp studies using silicate cement, composite material and zinc oxide/eugenol cement. The three techniques allow differentiation between reactions produced by the materials, but a poor correlation exists between the results from the different techniques. This information is considered important for a selection of techniques for biologic testing of dental materials.

Animals↗
PubMed1980

In vivo measurements of thermal diffusion through restorations of various materials.

Temperature diffusion was monitored through in vivo restorations with and without bases 0.5 and 1 mm thick. Temperature diffusion was highest through amalgam restorations and slowest through unfilled resin restorations. The rate of diffusion through composite resins and silicate cement fell between the extremes. Bases of both zinc phosphate cement and zinc oxide-eugenol cement reduced the rate of temperature change on the floor of the cavity beneath amalgam restorations. The temperature change was generally less under the 1 mm base than the 0.5 mm base. Bases used beneath the nonmetallic restorations did not reduce the magnitude of temperature change on the cavity floor.

Acrylic Resins↗
PubMed1977

Spectral fluorescence of direct anterior restorative materials.

The fluorescent characteristics of silicate cements, acrylic resins, and composite resins and all anterior restorative materials have been compared with the natural teeth when specimens were submitted to ultra-violet radiation. The effect of glazes on composite resins and of discolouration from ultra-violet radiation on composites and acrylic resins is to reduce the amount of fluorescence of the former and to change the quality of the fluorescence.

Acrylic Resins↗
PubMed1978

[Long-term animal experimental studies of a new dentin and pulp protective varnish (Bayer D-520)].

A new polyurethan varnish (Bayer D-520) was tested on 4 monkeys with a total of 96 cavities after the norms of "Recommended standard practices for biological evaluation of dental materials" of the ADA 1975. After the successful short-term experiment of two weeks, a long-term examination of dentin and pulp protective properties followed. 6 combinations were used: - 16 silicate cement fillings with varnish, 16 with Dycal base (negative control), 16 without protection (positive control) - 16 composite fillings with varnish, 16 with Dycal and 16 without protection After an observation time of 3 months, with marks of 0-3 for each criterion of the histological sample a significant difference (p less than or equal to 0.01) in favour of the varnish- and Dycal-protected cavities resulted. A difference between the varnish and the Dycal base could not be statistically established.

Animals↗
PubMed1982

A comparison of the in vitro cytotoxicity of four restorative materials assessed by changes in enzyme levels in two cell types.

A system is described for assessing the toxicity of freshly mixed restorative materials in vitro by measuring changes in the levels of beta-galactosidase and lactic dehydrogenase in both cultured cells and supernatants. The toxic effects of a zinc phosphate and silicate cement, a composite, and zinc oxide/eugenol were studied on two cell types, macrophages and fibroblasts, after 24 h exposure. Zinc oxide/eugenol, Silicap, and zinc phosphate were toxic to macrophages, in that order; Concise appeared to be nontoxic. Only zinc oxide/eugenol exerted significant effects on fibroblasts. Interposing dentine powder between the test cells and the material ameliorated the effects of all materials, possibly by the absorption of toxic components.

Acrylic Resins↗
PubMed1984

Prevention of in vitro secondary caries with an experimental fluoride-exchanging restorative resin.

We investigated the development of artificial caries lesions adjacent to experimental composite resins which release fluoride by ion exchange. Overall, compared with both a commercial, non-fluoride composite and a restorative silicate cement, the cavity walls and tooth surfaces immediately adjacent to the experimental resins developed fewer and/or smaller lesions. When lesions did develop, they did not penetrate as far along the cavity walls adjacent to the experimental materials. In general, the degree of protection imparted by the fluoride composites increased with increasing fluoride content. These results demonstrate the potential of these adhesive resins for restorative and other dental applications in which an extended fluoride presence would be of benefit.

Composite Resins↗