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The results from a large group of people are more likely to include a wide cross-section of the population sampled. This data provides practitioners with a better estimate of what their patients are likely to experience. It is estimated that, during 2 weeks of active bleaching, 77% of people will experience 3 or fewer days of sensitivity. On average, sensitivity is short-lived, thus making it is easy to underestimate the importance of discussing sensitivity with patients considering bleaching. However, for some, the duration of sensitivity is much greater and has a very negative impact on satisfaction.

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The polymerization shrinkage of resin composites may affect restoration quality. A double blind, randomized clinical trial was carried out to compare two curing techniques-Soft-Start (SS) and the plasma arc curing light (PAC). The hypothesis that, delaying the gel point (with SS) improves marginal seal, was tested at alpha=0.05. Also, this report includes two-week, three-month, one-year and two-year results for post-op sensitivity. Twenty informed participants, each needing two Class II and/or complex Class I restorations, gave written consent. All the teeth were trans-illuminated to rule out pre-op crack lines before restoration placement. Clinical RelevanceClass I and II composite restorations placed with a Soft-Start technique showed no significant changes in post-op sensitivity to cold or any decreased signs of marginal stress. 266Operative Dentistry Sensitivity to a standardized cold stimulus was performed preoperatively at 2 weeks and at 3, 12 and 24 months. Patients rated their sensitivity after stimulus by means of a Visual Analog Scale (VAS). In addition, two independent, calibrated investigators evaluated the restorations clinically at each appointment. There were no significant differences in VAS scores between the two groups at any appointment period (two-way ANOVA; p>0.05).Several conditions were defined as indicating marginal stress before the start of the trial. At 24 months, there was no significant difference between the SS and PAC groups.Conclusion: Within the limitations of this study, Class I and II restorations placed with a SS technique did not show significant changes in post-op sensitivity or decreased signs of marginal stress.

Compomers and resin‐modified glass ionomers have been developed to improve the physical properties of traditional glass ionomer cements. This project compared the toothbrush wear‐resistance of three compomers (Compoglass, Dyract, Hytac) and three resin‐modified glass ionomer restorative materials (Fuji II LC, Photac‐Fil, Vitremer) to that of two resin‐based composites (Herculite XRV, Silux Plus). Specimens (n = 7) were prepared according to manufacturers' instructions and stored in a humidor for 48 hours prior to testing. The specimens were subjected to 120,000 strokes at 1.5 Hz, using a brush‐head force of 200 g on a Manly V‐8 cross‐brushing machine. The slurry contained a 50:50 (w/w) mixture of toothpaste and deionized water. Abrasion‐resistance was calculated by measuring specimen mass‐loss prior to and subsequent to brushing. The data were analyzed using a one‐way analysis of variance (ANOVA) and the Tukey‐Kramer post‐hoc test. Significant differences (p±.0001) in mass‐loss were found, and loss ranged from 0.013 ± 0.003 g (Hytac) to 0.061 ± 0.009 g (Compoglass). No correlation (p= .959) between wear‐resistance and experimentally determined filler content existed. This study showed that all but one hybrid resin‐ionomer type material exhibited a resistance to toothbrush wear that was as good as or better than that of the two traditional resin‐based composite materials.

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Under the conditions of this study, toothbrushing increased the elemental release from dental casting alloys.