all-bond-2 and Dental-Caries

This clinical study and 3-year follow-up evaluated the efficacy of adhesive amalgam restorations for pediatric dental practice. The original goal of the study was to determine when bonding of amalgam restorations should be performed. After the initial set of study restorations were placed, it appeared that the bonding should always be performed and that the study should concentrate on the modes of restoration failure.

Topics: Calcium Hydroxide; Chi-Square Distribution; Child; Composite Resins; Dental Amalgam; Dental Bonding; Dental Caries; Dental Cavity Lining; Dental Marginal Adaptation; Dental Restoration Failure; Dental Restoration, Permanent; Dentin-Bonding Agents; Feasibility Studies; Female; Follow-Up Studies; Glass Ionomer Cements; Humans; Male; Methacrylates; Minerals; Molar; Resin Cements; Surface Properties; Tooth, Deciduous

The authors used bonded amalgams as pit and fissure sealants without mechanical preparation. They compared the two-year retention of the bonded amalgams with that of resin-based pit and fissure sealants. Clinical examinations at six months, one year and two years revealed no difference between the retention of the two sealants. This technique opens up the possibility of using bonded amalgam in pits and fissures surrounding very conservative preparations in a preventive amalgam restoration.

Topics: Acid Etching, Dental; Adolescent; Adult; Biphenyl Compounds; Case-Control Studies; Child; Dental Amalgam; Dental Bonding; Dental Caries; Dental Cavity Preparation; Dental Restoration, Permanent; Dentin-Bonding Agents; Follow-Up Studies; Humans; Methacrylates; Microscopy, Electron, Scanning; Phosphoric Acids; Pit and Fissure Sealants; Resin Cements; Resins, Synthetic; Surface Properties

To determine the antimicrobial properties of a selection of dentine bonding agents [DBAs] using the disc diffusion and direct contact methods and an ex vivo method using extracted carious permanent molar teeth.. DBAs (n=15) were tested using Streptococcus mutans UA159 in disc diffusion and direct contact methods. In the ex vivo study 6 DBAs were selected and pre- and post-treatment samples of carious dentine (n< or =12) were taken. Samples were also taken post-acid-etching. The number of microorganisms in dentine sample was determined and compared.. The inhibition zones and percent growth inhibition were related to the pH of the culture medium containing the DBA (p<0.01). Clearfill Protect Bond exhibited the greatest bacterial killing followed by ibond (99.8%+/-0.08 and 98.2+/-1.4, respectively). The phosphoric acid etchant alone resulted in an 83% killing. The in vitro tests results did not correlate. The ex vivo killing reflected the percent growth inhibition observed in the direct contact method.. A guide to the potential antimicrobial activity of a DBA may be gained from an assessment of its pH when added to bacteriological culture medium. The direct contact method gives a better reflection of the killing of bacteria in infected dentine than the disk diffusion method. Killing in the ex vivo model gives a more realistic and more reliable method for determining the antibacterial activity of a given DBA and that comparisons of the relative inhibitory activity of DBAs should be tested using this ex vivo model.

Topics: Acid Etching, Dental; Anti-Infective Agents; Bacteriological Techniques; Colony Count, Microbial; Culture Media; Dental Caries; Dentin; Dentin-Bonding Agents; Humans; Hydrogen-Ion Concentration; Materials Testing; Methacrylates; Microbial Sensitivity Tests; Phosphoric Acids; Polymethacrylic Acids; Resin Cements; Streptococcus mutans

A new fluoride releasing resin-ionomer cement was used for bonding of gallium alloy restorations in vitro. Etching, priming, and fluoride releasing resin-ionomer cement were used in the experimental group (ARG), prior to placement of the gallium alloy restorations. Three different controls were used: gallium alloy only (G), no etching, fluoride releasing resin-ionomer cement, gallium alloy (RG), etching, priming, non-fluoride cement and gallium alloy (ACG). The mean shear bond strengths of ARG group to enamel and dentin were higher than those of the three control groups. Artificial secondary caries lesions around the restorations in the experimental group and the control groups were produced, using a strep. mutans culture. The microradiographs were examined for presence of a caries inhibition zone near the restoration. Caries inhibition zones were clearly detected around RG and ARG, but not around G and ACG. The results indicate that the fluoride releasing resin-ionomer cement provided good adhesion and caries inhibition in enamel and dentin.

Topics: Adhesiveness; Animals; Cariostatic Agents; Cattle; Chi-Square Distribution; Composite Resins; Dental Alloys; Dental Bonding; Dental Caries; Dental Restoration, Permanent; Dentin-Bonding Agents; Electron Probe Microanalysis; Fluorides; Gallium; Glass Ionomer Cements; Humans; Materials Testing; Methacrylates; Microradiography; Resin Cements; Tensile Strength

The ability of a restorative material to bond and seal the interface with tooth structure is perhaps the most significant factor in determining resistance to marginal caries. Thus, the quality and durability of marginal seal and bond strength are major considerations in the selection of restorative materials. The purpose of this study was to compare the bond strength and marginal discrepancies of five adhesive systems: All-Bond 2, Clearfil Liner Bond, KB 200, ProBond and AELITE Bond. Twenty-five buccal and 25 lingual cavities were prepared in 25 caries-free extracted molar teeth, giving 10 cavities for each of the 5 adhesive systems. All teeth were restored with the resin composite Pertac Hybrid, or PRISMA Total Performance Hybrid with their appropriate adhesive systems. After restoration, the teeth were thermocycled, were stained with a 1.5% aqueous solution of a procion dye (reactive orange 14) and sectioned coronally with a saw microtome. Three sections of 200 microns thickness were prepared from each restoration which were then examined microscopically to measure marginal gap widths using a confocal tandem microscope. Shear bond strength measurements were carried out on the dentine bond using a universal testing machine. The All-Bond 2 adhesive system was found to have higher shear bond strength and to have the least gap width at the cementodentinal margin.

Topics: Adhesives; Bisphenol A-Glycidyl Methacrylate; Coloring Agents; Composite Resins; Dental Bonding; Dental Caries; Dental Cavity Lining; Dental Cavity Preparation; Dental Cementum; Dental Leakage; Dental Marginal Adaptation; Dental Restoration, Permanent; Dental Stress Analysis; Dentin; Dentin-Bonding Agents; Humans; Materials Testing; Methacrylates; Microscopy, Confocal; Molar; Stress, Mechanical; Surface Properties; Thermodynamics; Triazines