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smear layer apical periodontitis emergency drug kit antihypertensives respiratory stimulants glucose ammonia enamel rods enamel spindles keyhole appearance hydroxyappetite crystals rotary files k files h files wave one file self adjusting file enterococcus faecalis lactobacilli actinomycetes vitamin a vitamin d vitamin e vitamin k aids hiv oral symptoms immunity muscles of mastication deglutition antibiotics emeregency drugs cementum classification of composites properties of composites manipulation of composites tooth contacts tooth contours cranial nerves vagus nerve spinal accessory nerve hypoglossal nerve dental amalgam mercury toxicity manipulation of amalgam dentin bonding agents hybrid layer sclerotic dentin predentin dentinogenesis reversible pulpitis irreversible pulpitis peripcal cyst bay cyst initial steps final steps odontoblast layer permeability of dentin restoration fish theory kronfield's theory single visit rct multiple visit rct components of smear layer microorganisms in smear layer methods of removal autoclave hot water sterilizer boiling sunlight chemical sterilization steam som wall mount floor mount indications parts of microscope trouble shooting endodontics vitamin b innate immunity acquired immunity humoral immunity immunodeficiency syndromes addition silicon agar alginate polysulphide open mouth technique closed mouth technique positive pressure technique negative pressure technique selective pressure technique matrices retainers wedges nanometer nanotechnology composites gutta percha elements ah plus ah 26 zinc oxide eugenol cavity preparation classification of cavity vitamin c