Marginal sealing of relocated cervical margins of mesio-occluso-distal overlays.

We investigated the effect of cervical marginal relocation (CMR) on marginal sealing with two different viscosity resin composites, before adhesive cementation of composite computer-aided design/computer-assisted manufacture mesio-occluso-distal (MOD) overlays. Standardized MOD cavities prepared in 39 human molars were randomly assigned to three groups. The proximal margins on the mesial side were located 1 mm below the cementoenamel junction. On the distal side of the tooth, the margins were located 1 mm above the cementoenamel junction. In Groups 1 and 2, mesial proximal boxes were elevated with a hybrid composite (GC Essentia MD) and a flowable composite (GC G-ænial Universal Flo), respectively. CMR was not performed in Group 3. The overlays were adhesively cemented, and interfacial leakage was quantified by scoring the depth of silver nitrate penetration along the adhesive interfaces. Leakage score at the dentin-CMR composite interface did not significantly differ between the two tested composites but was significantly lower for Group 3. In all groups, scores were significantly higher at the dentin interface than at the enamel interface. These results indicate that the performance of flowable and microhybrid resin composites, as indicated by marginal sealing ability, is comparable for CMR

Influence of cervical margin relocation and adhesive system on microleakage of indirect composite restorations

Aim The aim was to evaluate the influence of the cervical margin relocation (CMR) and the adhesive system on the microleakage of indirect composite restorations with proximal margins located below the cemento-enamel junction (CEJ). Materials and methods Standardized MOD cavities with proximal margins located 1 mm below CEJ were prepared in 20 human molars and divided into 2 groups. Mesial margins in both groups were elevated with a flowable composite. Distal margins were not elevated. Composite CAD/CAM overlays were cemented with a resin composite; in Group 1 in combination with a universal adhesive in selective enamel etch mode, whereas in Group 2 with a three-step total-etch adhesive. Differences in leakage either at mesial or distal adhesive interface were evaluated for statistical significance (P < 0.05). Results In Group 1 statistically significant differences emerged in microleakage scores between CMR and non-CMR sites; higher scores were present at CMR sites. In Group 2 no statistically significant differences existed between CMR and non-CMR margins. When the non-CMR sites were compared between the two groups, significantly lower scores were observed in Group 1 compared to Group 2. Conclusion The CMR technique and the adhesive system employed for luting indirect restorations might represent a significant factor affecting microleakage at the interface below CEJ

EXPERIMENTALLY AND ANALYTICAL INVESTIGATION OF AXIALLY LOADED TIED COLUMNS WITH AND WITHOUT STEEL FIBERS

Bu çalışmada, eksenel yük altındaki çelik lifli/fiberli ve lifsiz/fibersiz etriyeli betonarme kolonların davranışı, hem deneysel hem de analitik olarak incelenmiştir. Deneysel bölümde 18 adet dikdörtgen kesitli etriyeli betonarme kolon eksenel yük altında test edilmiştir. Deney numunelerinin taşıma güçleri ile eksenel yük-boyuna birim kısalma ilişkisi elde edilmiştir. Analitik çalışmada ise, malzeme için geliştirilmiş olan matematiksel modellerden Saatcioğlu ve Ravzi, Sheikh ve Üzümeri ile Geliştirilmiş Kent ve Park Modelleri ayrıntılı bir şekilde ele alınmış, hesap esasları verilmiştir. Ayrıca, söz konusu bu matematiksel modeller kullanılarak deney numunelerinin analitik çözümü yapılmıştır. Elde edilen deneysel ve analitik sonuçlar karşılaştırılarak irdelenmiştir. In this study, the behaviour of axially loaded columns with and without steel fibers was investigated experimentally and analytically. In the experimental part, 18 rectangular reinforced concrete columns were tested under the axial load. Load carrying capacity and axial load-strain relationships of the specimens were obtained. In the analytical part, mathematical models (Saatcioglu and Ravzi, Sheikh and Uzumeri, Modified Kent and Park) which were derived for axially loaded column were investigated. In addition, the analytical solution which uses these mathematical models was carried out. Experimental and analytical results were compared and obtained results were discussed

The Impact of Having a Baby on the Level and Content of Women’s Well-Being

The primary objective of this study was to more fully understand the impact of having a baby on women’s well-being by attending to both the level and the content of well-being. To cover the judgemental and affective aspects of well-being we included global measures of life satisfaction and well-being and affective experience measures derived from the day reconstruction method. In a sample of 19 first-time mothers no differences between pre and postnatal reports of general life satisfaction, depression, anxiety, and experienced positive and negative affect were found, suggesting that the arrival of the newborn baby does not universally impact on women’s level of well-being. Changes in the content of well-being were studied by examining changes in the way women experience specific activities and interactions with various social partners. There appeared to be an upward shift in experienced positive affect during active leisure and a slight decrease in negative affect during time spent with relatives. The results are discussed in light of previously documented changes across the transition to motherhood in negative mood states, time use, women’s evaluation of various aspects of daily life, and relational satisfaction

Outcomes from elective colorectal cancer surgery during the SARS-CoV-2 pandemic

This study aimed to describe the change in surgical practice and the impact of SARS-CoV-2 on mortality after surgical resection of colorectal cancer during the initial phases of the SARS-CoV-2 pandemic