Dental Problems

Preventive Resin Restoration – Review

Resin RestorationThe etched resin techniques have proven results which has shown renewed interest in the conservative cavity design along with a view for the healthy tooth material preservation.
Preventive resin restorations are among the newer techniques which show long-term success. This treatment of resin restoration has various distinct advantages over the traditional amalgam restorations. But, it requires an excellent isolation of moisture and saliva contamination. Read on to know more.

Preventive resin restoration

A recent medication is done in the restoration procedure. With the advent of newer restorative materials the ideology of sealing for prevention of fissure caries rather than ‘the cavity extension for prevention’ came into practice.

Preventive resin restoration utilizes the invasive and non-invasive treatment of borderline or questionable caries. The resin placed in the carious areas and adjacent caries susceptible areas, seal them from the oral environment and provide a valuable treatment alternative to conventional restoration like amalgams.

Types of carious surfaces treated
There are three types of preventive resin restorations which are performed depending upon the carious lesion. These 3 preventive resin restoration types have high rates of retention for a period of 7 years.

  • Type I Group A:

    • Deep pit and fissure susceptible to caries.
    • The preparation size is very small.
    • Unfilled resin or sealant is used to restore the preparations of carious lesions involving round bur of size half or even less.
  • Type II Group B:

    • Minimal exploratory carious lesion.
    • Since the caries can be explored the preparation needs to be extended.
    • Preparation size is by the size of 2 round bur.
    • The restoration requires some filler to the unfilled resin.
  • Type III Group C:

    • Isolate carious lesion
    • The caries is very definite and requires considerable preparation.
    • Larger size bur is used following which a small bevel is placed at cavo-surface margin.
    • Unfilled resin layer followed by filled composite is introduced into the preparation.

Steps of placement:

The steps are the same as for the placement of resin restoration.


Placement of preventive resin restoration utilizes principles of acid etch technique similar to those of sealant placement with the exception of caries removal from isolated pits and fissures.

Clinical perspective:

Preventive resin restoration has shown to improve the long term health of teeth.

Materials like glass ionomer cement have been tried as glass ionomer rest a seal’ to incorporate their various advantages which are as follows.

  • Fluoride release benefits and
  • True adhesion to the enamel and dentin.

However, they have inherent disadvantages which are listed below.

  • Technique sensitivity and
  • Poor wear resistance which makes unsuitable as restorations in occlusal contact.

Advantages of preventive resin restoration:

  1. Minimal cavity preparation required thus prevents unnecessary removal of healthy tooth structure for retention.
  2. Seals caries thereby halting the destruction of tooth. For example, teeth pit and fissure, dens evaginatus.
  3. Loss of the restoration and subsequent replacement proves to be less invasive than that for conventional restoration like amalgam.


Early loss of preventive resin restorations similar to pit and fissure sealant has been attributed to insufficient etching.

Thus, it is very important to maintain excellent isolation from salivary and moisture contamination for the long term success of preventive resin restorations.

The above article discusses briefly about the preventive resin restoration. The minimal explorer carious lesions can be filled using pit and fissure sealants. The isolated carious lesions are generally removed without any extension in the surrounding healthy tooth. The tooth cavity is obturated with the filled resin, where as the pit and fissure sealants are used for the protection of unaffected pits and fissures. This preventive and conservative resin restoration has a greater success rate. But, it can be enhanced only by following a strict attention during the treatment process and also by ensuring a non-contaminated area. Numerous suggestions have been offered on the how to increase the success rate.

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