Bestoon Mohammad Faraj*
Hawzhen Masud Mohammed**
Kali Masud Mohammed**
*Conservative Department, School of Dentistry, Faculty of Medical Science, University of Sulaimani.
** Conservative Department, School of Dentistry, Faculty of Medical Science, University of Sulaimani.
CORONAL SEALING ABILITY OF COPALITE VARNISH WITH DIFFERENT INTERMEDIATE RESTORATIONS AS AN INTRA-ORIFICE BARRIER IN ENDODONTICALLY TREATED TEETH. A COMPARATIVE IN-VITRO STUDY
Coronal restorations having an effect on the outcome of root canal treatment.
The aim of this study was to evaluate and compare sealing ability of three cement base materials with and without cavity varnish in the orifice of root canal systems after root-canal treatment.
The palatal root of extracted human maxillary first molar teeth were selected, after preparation and obturation three millimeters of coronal gutta-percha were removed from the coronal aspect of the root canal and divided randomly into six groups (6 roots each). Root canal orifices were restored with conventional glass ionomer cement, zinc polycarboxylate cement and zinc phosphate cement bases with and without cavity varnish. All the specimens were thermocycled for 100 cycles at 7°C – 55°C for 60 sec in each bath. They were immersed in the 1% methylene blue solution for 7 days, and then sectioned into longitudinal sections. The extent of dye penetration was measured using stereomicroscope. Data were analyzed statistically.
All the materials leaked at the interface of restorative material-dentin wall. Glass ionomer cement with varnish sealed significantly better than the other groups.
Placement of a suitable intra-orifice barrier, like conventional glass ionomer cement with a layer of copalite cavity varnish over it, may help minimize coronal microleakage in endodontically treated teeth.
Keywords: Glass-ionomer; Zinc polycarboxylate; zinc phosphate; Copalite cavity varnish; Microleakage.