Effect of different curing modes on the Vickers hardness number and curing depth of bulk fill composites

Introduction: The purpose of this study was to compare the Vickers hardness number (VHN) and depth of cure of two types of bulk fill composites in high, low and soft light curing modes. Materials & Methods: In this experimental study, 60 cylindrical samples were fabricated from two types of bulk fill composites (Tetric N-Ceram and X-tra fil) in a Teflon mold with one semi-circular notch. Then, the samples were randomly divided into the following three subgroups based on the curing modes (high, low and soft) and were light-cured. The samples were removed from the molds, and their VHN and depth of cure were measured. Data were analyzed using One-way ANOVA and Tukey’s post hoc test at the significance level of P<0.05. Results: The mean VHN of the X-tra fil composite was significantly higher than that of Tetric N-Ceram composite (P<0.001). The depth of cure of X-tra fil composite was also significantly higher than that of Tetric N-Ceram composite in high and soft curing modes (P<0.001). Conclusion: According to the current results, X-tra fil composite is a convenient material for the restoration of deep cavity in posterior teeth compared with Tetric N-Ceram

The Efficacy of Maternal Lateral Decubitus Position During Labor in Correcting Fetal Occiput Posterior Position and Childbirth Outcomes: A Systematic Review

Background & aim: Fetal occiput posterior (OP) position during labor may be associated with negative maternal and neonatal outcomes. It is therefore necessary for the mothers to have active participation in changing their position during the labor in order to facilitate OP rotation. The present study aimed to investigate whether maternal lateral decubitus position during labor can correct fetal OP position and childbirth outcomes.Methods: In this systematic review, searches were made in the databases of Medline, Web of Science, Embase, Scopus, and Cochrane Central Controlled Trials Register as well as Persian databases including SID, Magiran and IranMedex from inception to September 2021. Eligible randomized controlled trials evaluating the effect of maternal position on fetal OP position during labor were selected. Cochrane risk of bias tool for randomized trials was used to assess the quality of included articles.Results: Four randomized controlled trials (RCTs) met the eligibility criteria. They included 871 participants, who were divided into two groups. overall, no difference was reported between the intervention and control groups in terms of the rate of occiput anterior position at birth. The mother's position in the same or opposite direction of the fetal occiput had no role in the spontaneous vaginal delivery rate and other outcomes and neonatal Apgar score.                           Conclusion: The lateral decubitus position of mother during labor played no role in fetal head rotation toward the OP position or delivery outcomes