Purpose: This study was undertaken to compare the microleakage of class V cavities restored with the newly introduced Embrace WetBond class V (EWC) composite resin and conventional Opallis composite resin. Materials and methods:In this in vitro study, class V cavities were prepared on 30 extracted bovine incisors, with the gingival floor and the coronal margin of the cavities 1 mm apical and coronal to the cementoenamel junction (CEJ) respectively. The cavities measured 3 mm in length, 2 mm in width, and 1.5 mm in depth. The teeth were randomly divided into two groups. In group I, the cavities were restored with Opallis composite resin in association with ExciTE adhesive system (total-etch); in group II, the EWC composite resin was used for restorations. After 500 thermocycling procedures, the teeth were immersed in 0.5% fuchsin solution for 24 hours. Then, the samples were placed within a polyester model and sectioned in the buccolingual direction. The samples were evaluated under a stereomicroscope at ×30 for the penetration of dye. The enamel and dentin margins were evaluated separately. To test ordinal results, we used nonparametric statistical methods. To find out whether each independent composite groups I and II came from the same populations, we used Mann-Whitney U test and to compare two related samples' coronal margin and gingival margin, Wilcoxon signed-rank test was used.Results: There was significantly more microleakage in group II at both the enamel and dentin margins (coronal margin: p = 0.04; gingival margin: p = 0.21). In both groups, microleakage at Conclusion:Despite the high speed and the short process of restoration with Embrace WetBond, it is not a reliable restorative material for class V cavities due to its inadequate marginal seal.
Background and aim: The most common form of periodontitis is chronic periodontitis, which is a destructive inflammatory disease of periodontal tissues and is usually associated with pocket formation, changes in density and height of alveolar bone, and sometimes gingival recession. Some patients are resistant to periodontitis treatment due to a weak immune system, smoking, and sometimes due to unknown reasons. Moreover, surgery is impossible in some cases; therefore, clinicians have to approach alternative methods such as laser therapy to achieve successful treatment outcomes. Since there are great differences among the results of previous clinical trials, a review study to investigate the materials and methods section of these studies seems necessary in order to find the reason of the controversies. The methodology of all the intervention studies that have evaluated the effect of diode laser on periodontitis treatment from 1997 to 2017 were examined and the results were reported. Conclusion: randomized controlled trials should comply with the correct protocol. All the details of the treatment protocol and severity of periodontitis should be recorded in order to achieve reliable results. It can be concluded that the results of some of the reviewed studies are not reliable.
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