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james taylor

on 21 December 2010

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Transcript of CAVITY PREP

CAVITY PREP BBBBASE VARNISH LINER lines the prepared tooth surfaces provides a thin barrier that protects the pulpal tissue from irritation caused by physical, mechanical, chemical and biology elements a type of liner is calcium hydroxide or DyO or Dycal or Dycal or Dycal Physical- Galvanic Shock
Mechanical- Clenching and gringing
Chemical- Acid reflux, vomit (bile)
Biologic- halitosis the base is an additional layer in the restoration process in order to the protect the pulp there are three types of bases.
1.protective-used to protect the pulp before a restoration is placed.
2.insluating-placed in a deep cavity preparation to protect the tooth from thermal shock
3.sedative-helps soothe the pulp that has been damaged by decay or a dentist during a porcedure. examples of bases
Zoe (zinc oxide eugenol)
IRM (intermediate restorative material)
zinc phosphate
polycarboxylate sedative base(clove oil)
insulating base as well durelon fleck's
insulating base
exothermic must be mixed on glass slab proctective and insulating base bases are basically mixed as thicker cements=) It is used in the deepest portion and walls of the prepared cavity. Used in order to seal dentinal tubules and also for pulp capping Stimulates secon dentin. the produc of that aids in repai dentin tion dary ring Dycal is supplied as a two-paste system. (base and catalyst) Other brand names include:
and sometimes
-ZOE Calcium Hydroxide cand be used with all types of restorative material Cavity varnish is a liner used to seal the dentinal tubules to help prevent microleakage and is placed in a cavity to receive amalgam alloy after any bases have been placed. Cavity varnish is being used less and less with amalgam restorations, and dentin bonding agents are replacing cavity varnish as the liner of choice. Cavity varnish has an organic solvent of ether or chloroform that quickly evaporates, leaving the resin as a thin film over the preparation. Cavity varnish is not used with composites since the varnish retards the set of composites and interferes with the bonding of composites. A small cotton pellet held by cotton pliers is dipped into the varnish just enough to wet the pellet. The cavity varnish is applied to the pulpal area and onto the edge of the margins of the preparation.
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