Purpose: This study evaluated the bond strength of four commercial resin luting cements to enamel and superficial dentin, using a second‐generation laboratory composite. Materials and Methods: Forty teeth were embedded in acrylic: 20 had superficial dentin exposed; 20 had enamel exposed. Each group was divided into four subgroups (n = 5) to be bonded with Variolink II, Dual Cement, 2‐bond‐2, and Permalute System, using an inverted, truncated cone of pre‐cured Artglass that was placed over the resin cement with a load of 2 N for 2 seconds. Specimens were stored at 37°C in 100% relative humidity for 24 hours before being tested for tensile bond strength (MPa). Data were analyzed using a two‐way analysis of variance. Tukey‐Kramer intervals for comparisons among resin cements and bonding substrates were calculated at a .05 significance level. Results: Significant differences were found among resin cements. Variolink II had statistically higher bond strength values for both substrates than the rest of the cements evaluated. When bonding was to enamel, all failures were cohesive in the composite, and when bonding was to dentin, some adhesive failures occurred at the resin cement‐dentin interface. Permalute System had higher bond strengths than 2‐bond‐2 and Dual Cement when bonded to enamel. Conclusions: Variolink II and Permalute had statistically different bond strengths to enamel and dentin. Variolink II showed statistically higher values for dentin bonding than the other cements. Use of Variolink II and Permalute resulted in statistically higher bond strengths than the other two cements. CLINICAL SIGNIFICANCE Esthetic restorations, such as tooth‐colored inlays and onlays, veneers, and crowns without metal substructure, rely on bonding for success and must be cemented with a resin cement. Bond strength of the resin cement to the restoration and tooth structure affects the outcome of the restoration. Variolink II had significantly higher bond strengths to enamel and dentin than the other cements evaluated in this study.
<p><span>The purpose of this study was to evaluate the effect that certain previously selected soda drinks could have on the integrity of the margins of composite restorations made on 25 human teeth, where the margins were placed both on enamel and dentin. Specimens were divided in different groups (n=5) to be exposed to soft drinks 30 minutes a day for 30 days. Selected drinks were: Coca Cola, Coca Cola Zero, Squirt, Gladiator and water. SEM pictures were taken at the beginning and at the 30 day mark. Data were compared and analyzed using Kruskal-Wallis. Results showed changes in color both in enamel and in dentin, as well as pigmentation of the composite resin qith the use of Coca Cola and Coca Cola Zero. This last one had the biggest negative impact on the margins of the resotrations, both on enamel and dentin, though this canges were not statistically significant. All soft drinks produced some damage to the margins which went from a small change barely detectable, up to a complete loss of integrity, these effects were not statistically significant among drinks. </span></p>
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