etchant in dentistry

UACJ

Biomedical Sciences Institute

Etchant Acid

Dra. Angela Arisbeth Avendaño Ortega

Dr. Alfredo Nevárez Rascón

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

acid technique http://www.urmc.rochester.edu/dentistry/about/history.cfm

Pic. 1

It provides a strong junction

between resin and enamel.

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.

The acid is useful in the laboratory

because of its resistance to oxidation,

reduction and evaporation , as

glue for dentures.

• 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.

It forms the basis of innovative procedures such as:

Objective: acts as demineralizing to

the enamel creating micro pores from

20 to 30 microns in depth which allow

greater adhesion of restorative

materials.

Phosphoric acid concentration

among 30 to 37%

((microretentions) in green,

blue compositeand yellow enamel prisms. http://www.sdpt.net/OPERATORIADENTAL/grabadoaci

doesmalte.htm

Pic. 2

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.

http://www.deltadent.es/blog/2010/03/07/porque-duele-la-muela-clinica-dental-madrid/

Hydrophobic

Hydrophilic

Pic. 3

• 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

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.

Presentation: 10 mL Dropper

http://dentala2z.co.uk/Pre10019/es

Pic. 4

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

Composition:

•Phosphoric Acid

•Purified Water and Thickening Agent

•Methylene Blue as Dye

•Benzalkonium Chloride

•The operating instructions are included inside

the product.

http://dentala2z.co.uk/Pre10019/es

http://dentala2z.co.uk/Pre10019/es

Pic. 5

Pic. 6

http://icctdaryluz.blogspot.com/p/protocolo-de-resina.html

http://www.omniodonto.com.br/categoria1.html

Pic. 7

Pic. 8

•Gel Etchant

•OptiBond Solo™ Plus

•OptiBond® FL

•OptiBond All-In-One™

•Vertise™ Flow

•3M ESPE

Pic. 9

Pic. 10

• 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.

• 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.

http://www.dentusonline.com/productos/detalle.php?id_pro=394

Pic. 11

• Product

• Etchant Acid /Porcelain Fgm

• 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.

http://www.ar.all.biz/g60549/

Pic. 12

• Porcelain preparer – CLARBEN

• Hydrofluoric Acid – CLARBEN

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

The main disadvantages are:

• If not handled the right time, excessive demineralization occurs

• Irreversible mistake

• Expensive

¨Materiales Dentales¨, Barceló Santana, Federico Humberto

“Ciencia de los materiales dentales”, Philips

http://www.dentaflux.com/acido_fosforico_37.html

http://www.sdpt.net/OPERATORIADENTAL/grabadoacidoesmalte.htm

http://es.wikipedia.org/wiki/%C3%81cido_fosf%C3%B3rico

http://www.kerrdental.es/materialesrestauraciones/category/EtchingMaterialsAndA

dhesives

http://www.hispadent.es/Catalogo/2_cementos.pdf

http://dentala2z.co.uk/Pre10019/es

http://www.monografias.com/trabajos36/adhesion-dentina/adhesion-dentina2.shtml

http://scielo.isciii.es/scielo.php?pid=S021312852004000400004&script=sci_ar

ttext

http://www.ar.all.biz/g60549/

http://issuu.com/zone0/docs/oral_38_sin_curvas

http://www.odontologia-online.com/foros/propiedades-grabadoras-del-fluoruro-

t4791.html