It can be concluded that the overcasted abutments showed lower misfit values when compared to the entirely casted abutments. No difference was observed on detorque values of prosthetic screws. After mechanical loading there was no difference on marginal misfit and detorque between the groups.
The aim of this study was to evaluate 3 transfer techniques used to obtain working casts of implant-supported prostheses through the marginal misfit and strain induced to metallic framework. Thirty working casts were obtained from a metallic master cast, each one containing 2 implant analogs simulating a clinical situation of 3-unit implant-supported fixed prostheses according to the following transfer impression techniques: group A, squared transfers splinted with dental floss and acrylic resin, sectioned, and re-splinted; group B, squared transfers splinted with dental floss and bis-acrylic resin; and group N, squared transfers not splinted. A metallic framework was made for marginal misfit and strain measurements from the metallic master cast. The misfit between the metallic framework and working casts was evaluated with an optical microscope following the single-screw test protocol. In the same conditions, the strain was evaluated using strain gauges placed on the metallic framework. The data were submitted to one-way analysis of variance followed by the Tukey test (α = 5%). For both marginal misfit and strain, there were statistically significant differences between groups A and N (P < .01) and groups B and N (P < .01), with greater values for group N. According to the Pearson test, there was a positive correlation between the misfit and strain variables (r = 0.5642). The results of this study showed that the impression techniques with splinted transfers promoted better accuracy than the nonsplinted technique, regardless of the splinting material used.
The splinting technique was considered to be as efficient as the conventional technique. The strain gauge methodology was accurate for strain measurements and cast distortion evaluation. There was no correlation between strain and marginal misfit.
This study was undertaken to obtain information both in vivo and in vitro on the role of adenosine triphosphate (ATP) in the inhibition of fatty acid synthesis in fasted mice.Fasted mice were injected intravenously with glucose or fructose or intraperitoneally with insulin to increase the supply of endogenous ATP. They then received acetate 1-(14)C, glucose 6-(3)H or fructose U-(14)C intravenously and were killed at various intervals. The controls received the labeled tracers only. The radioactivities of liver and carcass fatty acids were determined.The action of ATP on homogenized livers from fasted mice was also determined.The stimulation of lipogenesis was obtained under all these conditions, but only in animals fasted for 4 hr. Insulin was active only on the extrahepatic tissues. Fructose, as well as glucose, restored hepatic lipogenesis. In vitro, ATP restored lipogenesis by homogenized livers of mice fasted for 4 hr, but it inhibited the fatty acid synthesis by homogenized livers from unfasted mice.The significance of the results is discussed.
N6-2'Gdibutyryl cyclic AMP stimulates glycogenolysis and inhibits fatty acid synthesis in rat liver in vivo but has little effect on gluconeogenesis. In adipose tissue: it enhances lipogenesis and glycogenesis. These last effects can be explained by an increase of insulin release.
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