Insufficient pressure on the flask during processing causes porosity in denture.
An eccentric contraction is one that causes a muscle to lengthen.
Supporters of holistic dentistry state that mercury in amalgam fillings causes ill effects when placed as an
due to contraction of heart
Extension of knee
Exfoliation is primarily caused by a combination of thermal expansion and contraction due to daily temperature fluctuations. The heating of rock during the day causes expansion, while cooling at night causes contraction. This continuous expansion and contraction weaken the rock, leading to exfoliation.
big particles=low porosity small particles=high porosity
Expansion and contraction
left ventricular contraction
A muscular contraction that causes a muscle to shorten is called a concentric contraction. A concentric contraction is a type of isotonic contraction.
blood to flow into the pulmonary circulation
Porosity in welding is a result of dissolved gases or gases released during the welding process, being trapped in the metal when there is insufficient time to escape prior to solidification. If in the shape of rounded holes, the gas is called spherical porosity or just porosity. However, if elongated the terminology is wormholes or piping. Causes of porosity are;excessively long or short arc lengthwelding current too highinsufficient or moist shielding gastravel speed to fastbase metal covered with oil, grease, moisture etc.wet, unclean or damaged electrodes.
false