How do you do gingival retraction?

The most common method in gingival retraction which is fast, simple and inexpensive is cord packing that can be used separately or in combination with hemostatic agents in two techniques: single cord or dual cord [14]. Retraction cord penetration depth is influenced by the sulcus depth and periodontal status.

What is the purpose of gingival retraction?

The goal of gingival retraction is to atraumatically displace gingival tissues to allow access for impression material to record the finish line and provide sufficient thickness of gingival sulcus so that the impression does not tear off during removal.

What is retraction cord made of?

Hemodent Gingival Retraction Cord is made of cotton and impregnated with astrinigent, a buffered solution of 10 percent aluminum chloride. Hemodent cord is available in twisted and braided styles and comes in medium-thin (#9) and medium-heavy (#3) weights.

What is the double cord technique in gingival retraction?

The technique describes placing a smaller diameter cord soaked with haemostatic agent into the depth of the sulcus, causing some lateral tissue displacement but primarily controlling haemorrhage. The second larger diameter cord is then packed into the sulcus, causing further lateral tissue displacement (Figure 7).

How do you retract soft tissue?

The most common method used in dental practices involves retracting the oral soft tissue with a dental mirror or a dental suction and placing cotton rolls to absorb the saliva. In many cases, however, the auxiliary aids used are too small for fully retracting the oral soft tissue.

What is double retraction?

Context 1. the name indicates, two retraction cords are placed in the gingival sulcus, which is too deep to be sufficiently displaced with a single cord or where the tissue would collapse with the use of only a single cord.

What is a gingival retraction cord?

The gingival retraction cord is primarily used to push the gum tissue away from the prepared margins of the tooth, in order to create an accurate impression of the teeth. The gum can get in the way of an impression of a tooth, and this is why gums are typically pushed out of the way.

What is the refractive index of ordinary ray?

The ordinary ray experiences constant refractive index n_o but the extraordinary ray experiences refractive index that varies with the direction of propagation of the light in the crystal.

Which is the most effective gingival retraction cord?

In most cases, gingival retraction cord is the most effective and most commonly used method. Controlling the soft tissue, managing any bleeding and exposing the margins is what is most critical. That is why the clinician needs to understand all the choices available.

Where to place the retraction cord on a tooth?

The management includes placing the gingival tissues away from the prepared tooth margins so that they can be impressed, combined with providing for hemostasis when the gingival tissues might bleed.

Can a gingival retraction cord be soaked in hemodent?

Gum bleeding can be difficult to control and, in turn, make impressions hard to capture. As a result, some brands of gingival retraction cords are pre-soaked in Hemodent (a liquid used to stop minor gum bleeding). Many dentists prefer to soak the gingival retraction cord in Hemodent themselves, rather than having pre-soaked cords.

When do you remove the retraction cord from an impression?

Right before making the impression, the cord should be wetted with water so it won’t grab and tear the tissues when it is removed, creating more bleeding. Once the cord is removed, the retraction is maintained for 30 seconds. Be prepared to begin immediate syringing of your impression material.