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  • 1
    Electronic Resource
    Electronic Resource
    Microleakage in alloy-glass ionomer lined amalgam restorations after thermocycling (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 18 (1991), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Marginal microleakage was measured around amalgam restorations lined with alloyglass ionomer cement and coated with a glass ionomer varnish. Preparations were made in 48 human extracted mandibular molar teeth. Alloy-glass ionomer liners and varnishes were placed into selected preparations. Tytin amalgam was inserted into all of the teeth and left unburnished and unpolished. Half of the total samples were thermocycled for 5 days and the remainder were left in deionized water. The teeth were immersed in a 0.5% methylene blue dye and sectioned vertically with a diamond saw. Microleakage was scored visually at xl00 magnification, and the data were analysed using the Mann-Whitney U-test (P≤0.05). Thermocycling did not have a significant effect on microleakage, except when both an alloy-glass ionomer liner and varnish were used. Overall, the use of an alloy-glass ionomer liner made the most significant difference in reducing microleakage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1991.tb00025.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of undercut placement on crown retention after thermocycling (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 17 (1990), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to examine the effect of undercuts in castings and/or tooth structure on the retention of crowns luted with glass ionomer cement. After routine full-crown preparations had been made in 48 human premolars, wax patterns were fabricated for each tooth. Retentive coves were then produced with a round bur in either the tooth structure or the wax patterns, or in both. One group of teeth and patterns did not receive any undercuts; this was the control group. Castings were made in non-precious metal. All crowns were luted with glass ionomer cement. Half of the samples were thermocycled, and the remainder were kept at 37°C. Crowns were removed using tension (0.012 cm min−1) and the mean bond strengths calculated. The differences in retentive strengths were tested for statistical significance using anova and Scheffe's test. The presence of coves in castings and/or tooth structure significantly increased the retentive strength of castings cemented with glass ionomer, as compared with conventional crown preparations without retentive undercuts. The effect of thermocycling on the retentive strength of castings cemented with glass ionomer was not statistically significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1990.tb01410.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Enamel surface roughness analysis after laser ablation and acid-etching (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 20 (1993), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Laser-roughened enamel surfaces have been shown to provide for greater acid-resistance and enhanced restorative material/enamel bond strength. Extracted tooth enamel was irradiated with several lasers: CO2/Nd:YAG (CW), CO2 (RSP), Nd:YAG (CW), Nd:YAG (Q-switched), Argon (CW), and Ar:F excimer. Additional teeth were acid-etched. Energy densities were standardized at 25-47 J/cm2 for all mediums. Surface profile analyses were conducted with a profilometer to determine the amount of enamel surface roughness. The acid-etched samples exhibited both a greater amount of surface roughness and a qualitatively different type of enamel surface morphology than the laser-treated specimens. Independent use of the CO2 and Nd:YAG beams exhibited a moderate amount of roughness, while the coaxial CO2/Nd:YAG beam displayed surface roughness approaching that of the acid-etch samples. Different laser mediums produce enamel surface morphologies that are characteristic of a variety of inherent lasing parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1993.tb01603.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of ultrasonic instrumentation on microleakage in composite restorations with glass ionomer liners (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 19 (1992), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to determine the effect of ultrasonic instrumentation on composite resin restorations lined with glass ionomer cement by measuring the extent of dye penetration at the restoration/tooth interface. Preparations, 2-0 mm in diameter and 2-5 mm in depth, were made with a 331 bur in 96 human molar teeth without a bevel. The teeth were restored with glass ionomer eement liners (Shofu) and one of two types of composite resin (Silux® and P-30®). Half of the samples were ultrasonically instrumented for 10 s. The teeth were immersed in 0-5% methylene blue dye solution and vertieally sectioned. Mieroleakage was scored visually using a seale of 0 to 4. Statistical comparisons were made with X2 analysis and the Marin-Whitney U-test at the F〈0.05 level. Microleakage was significantly different between both resin types (P〈 0-001), and between the lined and unlined resins (P〈 0-001) that were instrumented, particularly in the P-30® restorations. Although P-30® restorations exhibited much less microleakage than Silux®, the use of a glass ionomer liner did not reliably reduce microleakage in either type of material after instrumentation with an ultrasonic device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1992.tb01587.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Bending strength of Fuji® and Ketac® glass ionomers after sonication (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 19 (1992), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Glass ionomer cements mixed by conventional methods contain voids that can decrease their overall strength. This study evaluated the effect of sonication on the reduction of air entrapment by measuring the bending strength in glass ionomer cements (Fujj-II® and Ketac-fil®). Glass ionomer cement was placed in identical-test vials and sonicated for 45s, 10s, or 0s. The bending strengths were measured (0.005 in min−1) after setting times of 1 or 2 weeks. Mean bending strengths (MPa ± SD) for the 12 treatment both cements (P〈0.001) and sonication times (P〈0.001). The effect of setting time produced minimal increases in bending strength (P〈0.218). The sonication of freshly mixed glass ionomer cements is a possible solution for reducing voids to increase bending strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1992.tb01490.x
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    Paper (German National Licenses)
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