The effect of surface penetrating sealants on leakage pattern of class V restorations with different locations of cervical cavity margins

الملخص EN

The present investigation was designed to study the effect of two types of surface penetrating sealants on leakage pattern of class V resin composite and resin modified glass ionomer restorations with different locations of cervical cavity margins (enamel and cementum) whether thermocycled or not.

A total of 120 sound human upper premolars were divided into two equal groups (60 premolars each) relative to restorative material used whether resin composite or resin modified glass ionomer.

Each group was further subdivided into three subgroups (20 premolars each) relative to type of surface penetrating sealant used.

In the first subgroup, cavities were restored without surface sealant treatment (control group).

In the other two subgroups, cavities were sealed with either pit/fissure sealant (Heleoseal clear) or specific surface penetrating sealant (Optiguard) respictevely after their restorations.

Each subgroup, was further subdivided into two classes (10 premolars each) relative to whether the restored teeth were thermocycled or not.

Standardized class V cavities were prepared with the coronal margins located in enamel and the cervical margins placed in cementum.

The prepared cavities were restored with either resin composite or resin modified glass ionomer according to manufacturers’ instructions.

The restored teeth were finished and polished.

The restoration/tooth margins in the surface sealed groups were conditioned using phosphoric acid etch then sealed by either Heleoseal clear or Optiguard surface sealants which were then light cured.

Half of the specimens were thermocycled between 5ºC-55ºC for 600 cycles.

After thermocycling, teeth were stored in saline solution at room temperature for 24 hours prior to testing.

Leakage pattern was tested using methylene blue dye test where teeth were immersed in 2% methylene blue dye solution for 6 hours at room temperature after their isolation except the restored area.

The dye then, was removed, thoroughly rinsed and allowed to dry.

After 24 hours, teeth were sectioned longitudinally and examined using stereomicroscope and photomicrographs were taken.

Microleakage was assessed using two methods, the first was leackage scores and the second was dye penetration surface area.

The measurements for microleakage were collected, tabulated and statistically analyzed.

It was found that the use of surface penetrating sealants improved the interfacial relations between resin-based restorations and tooth tissues.

The location of cavity margins played a significant role in optimizing the interfacial relations of resin composite restorations to tooth tissues.

Surface penetrating sealants were recommended when resin modified glass ionomer was used to restore root cavities.

Post-restorative sealing of restorations was not dependent upon the specifity of surface penetrating sealant.

Thermocycling adversely affected the marginal seal of restorations whether surface penetrating sealants were used or not.