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Control of Setting Expansion
Sometimes a setting expansion is advantageous for a dental procedure; sometimes it is disadvantageous, become it may be a source of error. Consequently, setting expansion must be controlled to obtain the desired accuracy in dental applications.
As can be noted from the results presented a lower W/P ratio and a longer mixing time increase the setting expansion. Each of these factors increases the nuclei density. The effect of the W/P ratio on the setting expansion is to be expected on a theoretical basis. At higher W/P ratio on the setting expansion is to be expected on a theoretical basis. At higher W/P ratios, fewer nuclei of crystallization per unit volume are present than with the thicker mixes. Because it can be assumed that the space between the nuclei is greater in such a case, it follows that there is less growth interaction of the dehydrate crystals and less outward thrust
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