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Retractive paste or retraction line?

According to statistics, about 50% of all dental work requires the use of the gum retraction method. The effectiveness and necessity of it has long been proven by specialists and has been successfully applied for many years. This greatly simplifies the preparation and filling of carious cavities close to the gingival margin, minimizing the probability of injury to soft tissues adjacent to the tooth and preventing oral fluids from entering the working field. Also, gingival retraction is widely used in orthopedics to obtain accurate casts and during the preparation of a dental crown for orthopedic construction. In pediatric dentistry, gum retraction is performed quite often, because there the danger of injury increases because of the restlessness of small patients.   

 

Retraction tools are presented today in two versions:

 

1.  Retraction thread.  It is a cotton thread, most often impregnated with a special blood-restoring compound, has good absorbent properties, thanks to natural fibers. Has a different thickness and structure (knitted, twisted). Good access to the work area. Its application usually does not cause complications, but requires the necessary skill and utmost attention, since the thread is placed in the gum groove with an acute rounded tool, which easily injures adjacent tissues.

 

2.  Retraction paste.   The most commonly used capsular filling (Retraction paste 3M ™ Astringent Retraction Paste), but it happens that there are carpets and cartridges. As a rule, their use is not justified because of the high material consumption and the need to purchase a special gun. Capsules with retractive paste 3M are suitable for almost all dispensers intended for composites. The composition contains hemostatic and vasoconstrictor components that prevent fluid from entering the work, which requires complete dehumidification .

 

The main advantages of the retraction paste "3M" are: ease of application with a special disposable spout, which is able to penetrate deep into the dentogingival space; low probability of injury due to the plastic compound and the absence of pointed tools during retraction; simplicity of application, significantly reducing the time costs of the doctor.

 

 Comparative analysis of characteristics of retraction paste "ЗМ" and retraction thread.

 

Characteristics

Retraction paste 3M

Retraction thread

Complexity of application

No

Yes

Absorption properties

Yes

Yes

Crocheting properties

Yes

Yes

Hygiene

Yes

No

(because of the increased likelihood of injury, there is a possibility of infection of an open wound)

Probability of trauma

No

Yes

The accuracy of the impressions

Yes

Yes

Adjusting the thickness of the opening

Yes

(visual inspection possible)

Yes


It should be noted that orthopedic dentistry uses the technique of a two-layer two-stage imprint, which involves the use of a retraction thread in the first stage and the use of a retraction paste "3M" in the second stage to obtain a better and more detailed impression.

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