class 1 composite restoration

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after doing a lot of research, I found this composite restoration kit best in its price range.
this video is about correct technique for composite restoration . this video gives easy and simple explanation for class 1 composite restoration.
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This video is a demonstration of class 1 composite restoration.
I am using waldent composite kit that I bought from dental kart.
Step 1: Acid etching
After trimming the tooth, you start the bonding process by taking out an acid tooth conditioner from the kit. Tooth conditioners contain 30-40 percent phosphoric acid. The conditioner needs to sit on the target area for at least 15 seconds and then rinsed off. This will make the tooth look like etched glass.
step 2: Bonding and curing
With an applicator, dab a small amount of bonding agent on the etched area. blow some air over the bonding agent to ensure that the layer is thin and even. Once the bonding agent is even on the dental surface, expose it to a curing light for about 10-20 seconds. The light triggers the catalyst in the bonding agent. It causes the agent to harden and establish a micromechanical bond with the etched surface.
Step 3: Applying the composite filling
use a shade guide to select the shade of composite filling that matches the patient’s tooth. work on the composite filling that is closest to the color of the patient’s natural teeth. If necessary, select a different shade of composite for the outer dental surface and the inner dental surface. This will make the restoration more natural-looking.
apply layers of dental composite, which provides the shape of the tooth. Each layer adheres to the bonding agent. The composite filling looks and feels like putty. apply and pat each layer into place. After this, expose the tooth to a curing light for about 10-40 seconds.

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Some dentists don't use acid etching.. why !????