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Enamel deproteinization before acid etching--a scanning electron microscopic observation.

Bhoomika Ahuja¹, Ramakrishna Yeluri, Sudhindra Baliga

¹Department of Pedodontics and Preventive Dentistry, K.D. Dental College and Hospital, Uttar Pradesh, India.

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|March 23, 2011

Summary

This summary is machine-generated.

Phosphoric acid (H3PO4) etching of enamel surfaces showed similar topographical features to those pretreated with sodium hypochlorite (NaOCl) and then etched. Standard phosphoric acid etching remains the optimal pretreatment method for enamel.

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Area of Science:

Dental Materials Science
Surface Chemistry
Biomaterials

Background:

Enamel deproteinization with sodium hypochlorite (NaOCl) is a technique used to enhance bonding.
The effect of NaOCl pretreatment on enamel etching patterns requires further investigation.

Purpose of the Study:

To compare the enamel surface topography after deproteinization with NaOCl followed by phosphoric acid (H3PO4) etching versus H3PO4 etching alone.
To evaluate the quality of the enamel etching pattern using Scanning Electron Microscopic (SEM) analysis.

Main Methods:

30 human enamel blocks were divided into three groups: H3PO4 etching, NaOCl treatment followed by H3PO4 etching, and a control (no treatment).
Samples were analyzed using SEM at 500X magnification.
Etching patterns were quantified using Auto-CAD software.

Main Results:

The mean etching pattern percentage for H3PO4 etching alone was 55.76%.
The mean etching pattern percentage for NaOCl pretreatment followed by H3PO4 etching was 53.58%.
No significant difference was found between the two treatment groups.

Conclusions:

The addition of NaOCl pretreatment does not significantly alter the enamel etching pattern compared to phosphoric acid etching alone.
Standard 37% phosphoric acid etching for 15 seconds is an effective and sufficient method for enamel pretreatment.