Materials for disinfection of the pulp space
Date conversion 06.12.2016 Size 12.2 Kb.
Desired Irrigant Actions
Have a broad antimicrobial spectrum and high efficacy against an aerobic and facultative microorganisms organized in biofilms.
Dissolve necrotic pulp tissue remnants
Prevent the formation of a smear layer during instrumentation
Quaternary ammonium compounds
Dissolves Necrotic tissue and debris
The amount of free chlorine is important for this breakdown of the proteins into amino groups
In dentistry conc of 0.5% - 1% -5.25% concentration, provides sufficient tissue dissolution and antimicrobial effect
Solution NaOCI is replenished frequently
Stored in dark place in tight seal
Smell is objectionable
Severe symptom if injected beyond apex
Effective in removing fatty tissue residues that are by-products of tissue necrosis
Quaternary ammonium antiseptics are normally used in water solution at 0.1% to 1%.
toxicity comparable with other irrigation solutions and a rather narrow bactericidal spectrum
Iodophores are organic iodine products are not allergenic and are effective at low concentrations.
They are antimicrobially effective at an iodine concentration
of 0.05% (volume/volume)
During preparation of the root canal a smear layer is formed. There is no clear scientifically based understanding if this smear layer must be removed or can be left
EDTA chelate and remove the mineralized portion of smear layers.
It decalcify up to a 50-mm thin layer of the root canal wall
EDTA is used in a concentration of 17%.
The smear layer consists of both an organic and an inorganic
component. To remove this smear layer effectively, it is
normally insufficient to use EDTA only. A proteolytic component
(e.g., NaOCI) must also be added for removal of the organic components of the smear layer
EndoDilator is a combination of EDTA and a NaOCl
Cationic agent and binds with positively charged bacterial cell wall
It has a property of substantivety
binds effectively to hydroxyapatite, and this provides a lasting reservoir of chlorhexidine after the completion of treatment.
Iodine potassium iodide
Biomechanic instrumentation and irrigation with an antimicrobial solution is essential for the disinfection of the pulp
In recent years more attention has been given to the use of calcium hydroxide as intracanal dressing of choice for the treatment of infected pulp necrosis.
Severe toxicity, derivatives of phenol, such as paramonochlorphenol, thymol, and cresol, are still in common use for endodontic treatment
Phenol is a nonspecific protoplasm poison, having optimal antibacterial effect at 1 % to 2%
Highly toxic and induce inflamatory changes
Its high toxicity, carcinogenic and mutagenic potential
Contain formaldehyde above the 10% normally used for fixation of pathologic specimens
Tricresol formalin is another formaldehyde preparation cont
formaldehyde preparations are potent toxins with an antimicrobial effectiveness much lower than their toxicity. containing 10% tricresol and 90% formaldehyde
Chlorine has been used for irrigation as well as intracanal
dressing in the form of Chloramine-T
Iodine, in the form of iodine potassium iodide, is a very
effective antiseptic solution 175,113 with a low tissue toxicity
Iodine potassium iodide releases
vapors that have a strong antimicrobial effect
Used as slurry of calcium hydroxide in a water base
Direct contact experiments in vitro require a 24-hour contact period for complete kill of enterococci
One week of intracanal dressing has been shown to safely disinfect a root canal system
Ability to hydrolyze the lipid moiety of bacterial lipopolysaccharides,
thereby inactivating the biologic activity of the lipopolysaccharide
filled homogeneously to the working length.
Use of laser high induce lethal photosensitization on canal microbiots. Irrigantion using electrochemically activated water ozone gas information into the endodontic system. In the future, other ways to fill root canal systems may evolve and/or be established, such as the sue of resin bonded systems , bioactive materials or even the attempt to regenerate pulp tissue in necrotic cases.
ROOT CANAL-FILLING MATERIALS
Sealers and Cements
Calcium Hydroxide Sealers
Glass lonomer Cement
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