Abstract
The Air-abrasion system is thought to be a useful method especially for the pediatric dental field. This system has however, very high cutting efficacy, so that it may cause accidental or inapparent pulp exposure and need direct pulp capping before crown restoration.
The present study was undertaken in order to observe the influence of direct pulp capping with the adhesive resin on the exposed pulp caused by the air-abrasion. Class V cavities were prepared in 159intact permanent teeth of 10 young mongrel dogs, and the pulps were intentionally exposed by airabrasion. The experimental teeth were divided into the experimental groups and control groups. After chemical surgery, in the experimental groups, cavities were capped and sealed with adhesive resin system “Liner Bond II ®”(K uraray) and resin composite “Clearfil AP-X®”( Kuraray), while in the control groups, cavities were capped with calcium hydroxide medicament “Calvital®”(Neo medicine manufacture). At 7,14,30,60 and 90 days after operation, histo-pathological observations of the pulp were undertaken using light microscope and transfer electron microscope (TEM).
1) As a result of light microscope observation, no remarkable inflammatory changes were seen in both for the experimental groups and control groups. Compared with the control groups, a slight delay of the dentin bridge formation was observed in cases of the groups after the 7 day and 14 day of the experimental groups. However, for dentin bridge formation, a clear difference between the experimental groups and the control groups was not observed after the 60 day and 90 day groups.
2) As a result of transfer electron microscope observation and X-ray microanalysis, no remarkable inflammatory cells into the pulp were observed around the Al2O3, particles in the 30 day experimental groups. In the 60 day experimental groups, growth of the endoplasmic reticulum of fibroblast was observed and pulpal cells were activated.
These findings suggested a slight influence of Al2O3, particles on the pulp remained but “Liner Bond II ®”(Kuraray; adhesive resin system) is useful for direct pulp capping and sealing to pulp exposed by the air-abrasion.
