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At least 415 records · Page 23Linked to original sources
PubMed1994

[The effect of different liner materials on the polymerization of composites].

It has been shown that the polymerization of certain composite filling materials are inhibited by eugenol containing temporary filling materials. The aim of this study was to evaluate the influence of different lining materials (Ketac-Bond, Vitrebond, Dropsin, Dycal, Alkaliner, Super EBA [= control]) on the degree of polymerization of different composites (Brilliant Lux, Brilliant, Herculite, Dual-Cement). The degree of polymerization was characterized by Knoop hardness measurements. The data were analysed by the Wilcoxon test. All lining materials decreased the hardness of the adjacent zone of the tested composites. Brilliant Lux showed a significant decrease (p < 0.01) in hardness until a distance of 200 microns from all lining materials. The chemical curing composite (Brilliant) was generally less influenced in its polymerization by the tested lining materials. Light-activated glass ionomer materials influenced the polymerization at least. It was concluded that light-activated composites seemed to be more influenced in their polymerization by adjacent lining materials than chemically activated ones.

Composite Resins↗
PubMed1990

Mixed Class V restorations: the potential of a dentine bonding agent.

The marginal micromorphology and seal of mixed Class V restorations (i.e. restorations with margins located 50 per cent in dentine and 50 per cent in enamel) using Scotchbond VLC or Scotchbond 2 bonded to dentine in conventional and saucer-shaped cavities were evaluated. The four operative systems tested included a two-step incremental filling technique using the light-curing composite Silux, two direct inlay techniques using Silar or Silux as a luting cement and an inlay technique utilizing a Ca(OH)2 liner. All restoration types showed poor marginal adaptation in dentine irrespective of cavity design and bonding agent used. The inlay technique, tested in seven different variations, did not optimize marginal adaptation. Cavity lining with the Ca(OH)2 base material adversely affected dentine bonding. In mixed Class V restorations, marginal adaptation at the dentinal cavosurface line angle continues to pose a problem.

Acrylic Resins↗
PubMedDate not supplied

[Increased resistance to demineralization on enamel cavity walls by application of fluoride solution].

Dental enamel cavity walls of bovine extracted incisors were submitted to different treatments before to be "restored" with amalgam. The Group A non received treatment; the Group B received only a conventional cavity varnish and the Group C received a solution of sodium fluoride (2%) + conventional cavity varnish (2 applications). After 7 days of immersion in gel acid, the ground sections were studied in polarized microscope. The Group C that received sodium fluoride + conventional cavity varnish presented more resistance to demineralization. The Group B that received only cavity varnish presented a reduction in resistance to demineralization, and the Group A that non received treatment presented minor resistance to demineralization. Therefore, is emphasized the importance of application of sodium fluoride in cavity walls before lining with conventional cavity varnish and restoring with amalgam to obtain more resistance to demineralization.

Animals↗