Fatigue behavior of restorations used under the rest of removable partial denture

The question about resistance of resin composites under rest in removable partial denture [RPD] is still unanswered. It is important to find the strongest material that withstands the applied stresses when used under RPD components.To evaluate and compare the fatigue behavior of amalgam and composite restorations used under the rest of the removable partial denture. Forty-five permanent human upper premolars were prepared with standard class II DO cavities and divided into 3 groups of specimens [n=15 for each group]. Group I was filled with amalgam [Dispersalloy], group II and III were filled with resin composite [Flitek Z250 and Tetric ceram, respectively]. The teeth were stored in distilled water for 14 days before testing. After thermocycling, the [staircase] approach was used to determine the flexural fatigue limits [FFL]. The mean differences were evaluated using One-Way ANOVA and post hoc test. A strong significant differences of flexural fatigue strength have been found between amalgam and composite groups [P<0.001]. There was no significant difference between two groups of resin composite [P=0.1]. To achieve more flexural fatigue strength in the rest seats, the use of resin composite in comparison with amalgam is recommended

[ effect of dietary Aloe vera gel extract supplementation on lipid peroxidation of broiler breast fillets during frozen storage]

To improve the oxidative stability of meat products, the use of the dietary form of natural additives, especially those with plant origin is increasing. Aloe vera plant, the in vitro antioxidant effect of which has been previously discussed, is a potential candidate for this purpose. This study was designed to evaluate the effects of feed supplementation with Aloe vera gel extract on lipid peroxidation of broiler breast fillets during frozen storage. Fifty-four 1-day old broilers were allocated into three groups [basal diet as control, basal diet supplemented with 100 and 300 mg/kg methanol extract of Aloe vera gel] and fed for 6 weeks. In the term, chicks were slaughtered and their breast fillets were stored at -20[degree sign]C for 9 months. Lipid peroxidation was assessed after 1, 3, 6 and 9 months of frozen storage using chemical [PV and TBARS] and sensory evaluations. Results indicated that incorporation of 300 mg/kg Aloe vera gel methanol extract in broiler diets caused the delay of lipid peroxidation in raw breast meat [with 9.6 meq/kg, 92.67 micro g/kg and 6.3 in PV, TBARS and Sensory evaluations, respectively] in comparison with control sample [with 15.2 meq/kg, 139.33 micro g/kg and 3 in mentioned evaluations] at the last day of the experiment [p<0.05]. This study showed that methanol extract of Aloe vera gel can be considered as a dietary supplementation substance in chicken diet and can delay the oxidative spoilage of chicken breast fillets during frozen spoilage