레진강화형 글래스아이오노머 바니쉬를 이용한 상아세관의 폐쇄 평가: 상아세관액 흐름의 실시간 측정 및 주사전자현미경 관찰

Abstract

The purpose of this study was to compare the occlusive effect of a resin-modified glass ionomer (RMGI) varnish and an oxalate-based desensitizing agent on exposed dentin by evaluating the flow dynamic of dentinal fluid and SEM evaluation of the dentin surface after treatment. Sixteen caries- and restoration-free extracted molars were fixed to slide glasses after horizontally sectioning the roots at 5 mm below the cemento-enamel junction (CEJ). The prepared specimen was connected to a fluid flow measuring device (nano-Flow), and verified no fluid leakage. A V-shaped cavity was prepared at the CEJ to expose the dentin surface, which was then acid-etched, washed, and blot dried. The surface was treated either with an RMGI (Clinpro XT varnish) or an oxalate-based desensitizing agent (SuperSeal) (n=8). A real-time fluid flow was measured throughout the procedures. The fluid flow rates before and after each treatment were evaluated, and the surfaces of the treated dentinal tubules were also examined with SEM. A significant reduction in the rate of fluid flow was observed after treatment in both groups (p<0.05). Clinpro XT varnish exhibited a greater reduction in the fluid flow rate than SuperSeal (p<0.05). SEM evaluation revealed that the size of dentinal tubules was reduced as a result of the deposition of RMGI and oxalate crystals in Clinpro XT varnish and SuperSeal, respectively. Both agents reduced the fluid flow rate, with Clinpro XT varnish being more effective.