Subject(s)
Cementation/methods , Crowns , Dental Bonding , Dental Cements/administration & dosage , Humans , Stainless SteelSubject(s)
Adhesives , Composite Resins , Dental Bonding , Animals , Cattle , Dental Restoration, Permanent , Dental Stress Analysis , Orthodontic AppliancesSubject(s)
Dental Equipment , Zinc Phosphate Cement , Aluminum , Chemical Phenomena , Chemistry , Freezing , Hardness , Silicate Cement , Solubility , Stress, Mechanical , Tin Fluorides , ViscositySubject(s)
Color , Composite Resins , Dental Restoration, Permanent , Acrylic Resins , Caffeine , Hydrolyzable Tannins , Light , Nicotine , Time FactorsSubject(s)
Dental Bonding , Fluorides, Topical , Pit and Fissure Sealants , Animals , Cattle , Tensile Strength , Tin FluoridesABSTRACT
An in vitro study of the bactericidal or bacteriostatic effects of several pulp therapy compounds and their components on selected bacterial commonly isolated from infected primary teeth was undertaken. It was determined that zinc oxide had no inhibitory effects on E. coli, Staph. aureus, and Strep. viridans; however, the addition of eugenol to this system retarded the growth of only the grampositive organisms. The inclusion of zinc acetate as a setting accelerator inhibited both gram-positive and gram-negative bacteria. Also the inhibitory effects on these three organisms could be greatly enhanced by the addition of formocresol or paraformaldehyde to the zinc oxide--eugenol--zinc acetate system. It was also noted that Sargenti's N-2 paste was apparently no more effective in retarding growth of these organisms than the mixtures. Only the lead tetroxide and hydorcortisone present in the N-2 paste was toxic to the Staph. aureus but not to E. coli or to Strep. viridans. The other heavy metals in N-2 apparently have no antibacterial activity in the manner in which they were tested. This evidence suggests, but is not conclusive, that zinc oxide--eugenol--zinc acetate, with or without formaldehyde-containing compounds, may be effective in the elimination of bacteria from pulpotomized primary teeth. Therefore, the addition of highly cytotoxic chemicals which will remain sealed in a root canal and be active for extended periods of time may not be necessary for successful treatment.
Subject(s)
Bacteria/drug effects , Formaldehyde/pharmacology , Formocresols/pharmacology , Root Canal Filling Materials/pharmacology , Zinc Oxide-Eugenol Cement/pharmacology , Anti-Bacterial Agents , Escherichia coli/cytology , Escherichia coli/drug effects , Humans , In Vitro Techniques , Staphylococcus aureus/cytology , Staphylococcus aureus/drug effects , Streptococcus/cytology , Streptococcus/drug effectsABSTRACT
This study was undertaken to compare the resin-enamel bond strengths of seven anterior restorative resins using the acid-etch technique. Six of the materials (Restodent, Enamelite, Smile, Nuva-System, Concise, and Adaptic) were composite resins. Only one, Sevriton, was an unfilled resin. Of the seven, only Sevriton and Smile were not designed for the acid-etch technique. Of the materials tested, Sevriton and Enamelite had the weakest bonds. There was no significant difference in the bond strength among Nuva-System, Smile, and Restodent; the bonds of all these were stronger than those of Sevriton and Enamelite. Concise showed a significantly greater bond strength than all the other materials in the study except Adaptic and the Nuva-System. The resin-enamel bond strength of Adaptic was of a greater magnitude than that of all other test materials.
