نتایج جستجو برای: twin block
تعداد نتایج: 185375 فیلتر نتایج به سال:
The objective of this study was to evaluate and compare the effects Twin Block Forsus on Posterior Airway Passage (PAP) pharyngeal wall Thickness (PPWT) in treatment Class II division 1 malocclusion. This a 2-arm parallel, randomized controlled trial. A total 24 malocclusion patients indicated for with functional appliances were equally divided among (3M Unitek Corp, Monrovia, Calif) groups. Sk...
As a natural biocomposite, Strombus gigas, commonly known as the giant pink queen conch shell, exhibits outstanding mechanical properties, especially a high fracture toughness. It is known that the basic building block of conch shell contains a high density of growth twins with average thickness of several nanometres, but their effects on the mechanical properties of the shell remain mysterious...
Behavior genetic approaches are becoming increasingly popular in political science. Many studies, to date, used a classical twin design to explore both political participation and ideological self-placement in Western democracies but studies in different political contexts, such as post-communist countries, are scarce. This paper is the first to explore the heritability of ideology and politica...
This paper estimates the causal effect of teenage childbearing on educational attainment using two cohorts of Australian twins and their relatives. Our main finding is that the negative effect of teenage childbearing on educational attainment appears to be small. We find no difference in educational attainment between teen mothers and their identical twin sisters. Data on the relatives of the t...
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