HMCS Max Bernays Pre-Deployment Brief (May 2024).pptx
Etchant in dentistry
1. UACJ
Biomedical Sciences Institute
Etchant Acid
Dra. Angela Arisbeth Avendaño Ortega
Dr. Alfredo Nevárez Rascón
2. On the 50’s
Dr. Michael G.
Buonocore studies’, it has
been creating a way to
get more retentive
enamel surfaces, in other
words: enamel etchant Pic. 1
acid technique http://www.urmc.rochester.edu/dentistry/about/history.cfm
It provides a strong junction
between resin and enamel.
3. Also called Orthophosphoric acid, is a flammable chemical
compund of formula H3PO4.
On its liquid form the phosphoric acid is transparent, colorless and
viscous. Is obtained by treating calcium phosphate rocks with
sulfuric acid, then filtering the resultant liquid to remove
the calcium sulfate.
4. The acid is useful in the laboratory
because of its resistance to oxidation,
reduction and evaporation , as
glue for dentures.
It forms the basis of innovative procedures such as:
• Resin bonded metal retainers
• Porcelain laminate veneers
• Holders of orthodontics (brackets)
Also solves the problems arising from the resins such as filtering and
marginal pigmentation .
The bond strength of etched enamel :
165 kg/cm² to 227 kg/cm² , depending on the resin.
5. Phosphoric acid concentration
among 30 to 37%
Objective: acts as demineralizing to
the enamel creating micro pores from
20 to 30 microns in depth which allow
greater adhesion of restorative
materials.
((microretentions) in green, Pic. 2
blue compositeand yellow enamel prisms. http://www.sdpt.net/OPERATORIADENTAL/grabadoaci
doesmalte.htm
6. 1. Placed on the enamel phosphoric acid concentration of 30
to 37%
2. Leave for 15 to 60 sec
3. Wash with water and air for 5 sec
4. Pressurized air dry for 5 sec
5. Placing liquid resin or adhesive based on BIS-GMA with a
solvent such as triethylene glycol dimethacrylate (TEGDMA)
and a solvent such as alcohol or acetone gives the liquid flow.
6. Harden for either polymerization systems.
8. • Etch enamel and dentin in one step, the first 15 seconds on the enamel and
then about another 15 sec dentin.
(No more than this time)
•Wash thoroughly from 15 to 30 sec with water
•Dry with cotton or special sponge (Do not use air or alcohol)
•Place adhesive hydrophilic with solvent such as water, acetone or alcohol
•Volatilize with air insufflations for 5 sec
•Polymerize
•Place the composite
http://www.youtube.com/watch?v=5DnY3h9LbQw
9. Directions:
To condition both the surfaces of the tooth enamel and
the dentin prior to placing an adhesive restoration.
To clean porcelain surfaces, metal or resin Para la limpieza
de superficies de porcelana, metal or resin before the
accession of any resin, sealant or adhesive cements.
Pic. 4
http://dentala2z.co.uk/Pre10019/es
Presentation: 10 mL Dropper
10. Product Benefits:
•Ideal viscosity
•Application via syringe
•37% phosphoric acid to give the best results in etching dentin
•2% benzalkonium chloride makes an antimicrobial etching
•Provides controlled depth of dental etching
•Does not dry and maintains its consistency
•Predictable dental etching
•No fillers or additives
Pic. 5
http://dentala2z.co.uk/Pre10019/es
Composition:
•Phosphoric Acid
•Purified Water and Thickening Agent
•Methylene Blue as Dye
•Benzalkonium Chloride
•The operating instructions are included inside
the product.
Pic. 6
http://dentala2z.co.uk/Pre10019/es
14. • It is an acid that attacks and creates channels on glass or
ceramics.
• It is highly toxic
• Create these channels in the glass-ceramic
(Leucite, feldspar, lithium disilicate, no other)
producing a mechanical retention similar to that makes the
phosphoric on dental tissue, then add the silane which
penetrates these canaliculi and which binds chemically to the
glass, the resin is on the silane as part of resinous elements are
used to apply ceramic restorations on dental tissue. The
silane chemically bonded to the resin.
15. • Silanes aid the adhesion between organic and inorganic
substances. As bi-functional molecules, radicals combine their
silica with the silica in restorative materials, and their co-organic
radicals polymerize with the organic matrix resin cements.
They can also be ceramic or bondingprimers / Coupling
agents.
Pic. 11
http://www.dentusonline.com/productos/detalle.php?id_pro=394
16. • Product http://www.ar.all.biz/g60549/
• Etchant Acid /Porcelain Fgm Pic. 12
• Description
• Fondac Porcelain is a low viscosity gel containing 10% hydrofluoric
acid etching of porcelain.
• Presentation:
• Pack containing: • A syringe with 2.5 ml. of product.
• Indications for use: It is suitable for etching dental porcelain surface with the
aim of increasing their membership in restoration processes. The engraving is
critical to have an optimal interaction between the resin cement and ceramic
restoration, promoting retention and encouraging resistance to the restoration.
18. The main advantages of etchant systems are:
• Demineralization and infiltration´s dentin quickly
• They are not as sensitive to different moisture conditions of
dentin
• Hygienic application
• Consistent and stable composition
• Blue dye application for facilitation
19. The main disadvantages are:
• If not handled the right time, excessive demineralization occurs
• Irreversible mistake
• Expensive
