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Apex locator in retreatment cases:
- Electronic apex locators may give misread for working length when gutta-percha is initially being removed.- Due to that file beging covered with chloropercha that may affect its conductivity.
Removal of overextended GP:
- Inserting a new hedstrom 0.5 to 1 mm beyond the apical constriction, using a gentle clockwise rotation then slowly and and firmly withdrawn with no rotation, removing the overextended material.- Avoid excessive force the instrument.- Not softened the overextended GP with solvent.- remove the overextended gutta percha by barbed broach or by H file- after remove of gutta percha, heat the tip of instrument and insert to catch the gutta percha and removed suddenly.
Define Objective of nutrient needs during periods of pregnancy? describe the various physiological changes during pregnancy, describe foetal growth and development and
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How can an adult lose billions of cells from all parts of the body each day and still survive?
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