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ETCHING AND ITS IMPORTANCE IN ADHESIVE DENTISTRY

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mithilamhapankar's picture
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Adhesion to tooth structure by composite restorations is achieved by means of acid etching.Acid etching causes roughening of the surface leading to formation of microporosities into which the composite will bond micromechanically.However it is important that we do not forget the significance of this acid-etching and the correct method of doing so. Here are a few things to keep in mind while acid etching.

Acid etching of tooth surface is achieved by applying PHOSPHORIC ACID on the required tooth surfaces. This acid used is of 37%conc. and applied for 15 seconds since any amount of time beyond this would produce the same amount of roughness.Nowadays instead of the liquid etchant gel etchants are widely available which are more viscous and more user friendly.After gel application the surfaces should be thoroughly washed n dried to achieve a frosty appearance.

The most important thing that one should remember is that though many dentinal adhesives are now available, etching dentin is not as reliable as etching enamel because:
*Dentin is a dynamic tissue.
*It consists of considerable amount of organic tissue compared to enamel.
*It has close proximity to pulp tissue
Hence one must be very careful when etching dentin.As far as possible etching must be restricted to enamel, this is because too much etching or drying can lead to collapse of the collagen fibrils present in the tubules, this further can lead to failure of the restoration due to microleakage and hence secondary caries.

A guideline for the critical steps in dentin bonding would be:
-Adequate isolation to avoid salivary contamination and interference in the micromechanical bonding.
-Adequate pulp protection especially in deep cavities.
-Acid etching for optimum time of 15 secs with 37%conc. phosphoric acid.
-Avoid over-drying of the dentinal tubules.
-Appropriate application of selected bonding agent.

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sushantpatel_doc's picture
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Re: ETCHING AND ITS IMPORTANCE IN ADHESIVE DENTISTRY

What is the minimum depth required in the tooth preparation for a composite restoration to achieve adequate retention?

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mithilamhapankar's picture
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Re: ETCHING AND ITS IMPORTANCE IN ADHESIVE DENTISTRY

The best property of composite is its ability of micromechanical adhesion, unlike amalgam, depth isnt a factor for retention...retention depends on etching,bonding and most importantly beveling.
Hence, just removal of caries is sufficient for retention,what one should concentrate on is the technique,isolation as well as incorporation of bevels.

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ETCHING AND ITS IMPORTANCE IN ADHESIVE DENTISTRY

 The best property of composite is its ability of micromechanical adhesion, unlike amalgam, depth isnt a factor for retention...retention depends on etching,bonding and most importantly beveling.

Hence, just removal of caries is sufficient for retention,what one should concentrate on is the technique,isolation as well as incorporation of bevels.

hi,

I think there must a depth of at least 2.5 to 3 mm or perhaps even more for a composite filling to be retentive. Dr. Gordo Christensen also recommends creating undercuts. If there is not sufficient depth then there will be no strength to the filling. Beveling in posterior composite restorations is a controversial topic.

If the caries are incipient then you could use fissurotomy burs and in case if the caries is superficial and not very broad you could flow flowable composite or selants and cure it. But the caries must be very superficial for this to succeed.

Regards,

Veerendra darakh

 

 

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Raise your practice level by a  comprehensive three session hands on  course on ADHESIVE DENTISTRY. It  will cover light cure composites, glass ionomers etc. The course will cover and the participants will get an hands on experience of almost categories of restorative materials. The course is conducted regularly in Dr. Veerendra Darakh's Dental clinic.

Contact darakh[at]vsnl.com for more details.

 

 

Raise your practice level by a  comprehensive three session hands on  course on ADHESIVE DENTISTRY. It  will cover light cure composites, glass ionomers etc. The course will cover and the participants will get an hands on experience of almost categories of restorative materials. The course is conducted regularly in Dr. Veerendra Darakh's Dental clinic.

Contact darakh[at]vsnl.com for more details.

 

 

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ETCHING AND ITS IMPORTANCE IN ADHESIVE DENTISTRY

 Scotchbond Universal Adhesive is a single-bottle adhesive with a forgiving technique that offers versatile solutions for direct and indirect restorations. With Scotchbond Universal adhesive, dentists now have an easy-to-use, single-bottle solution that provides uncompromising results for all surfaces in total- or self-etch mode

 

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 Post your case presentations on www.dentistrytoday.info

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