Purpose: to test reactions of silver cones in clinical situations under SEM.
- N= 13 silver cones removed from 12 patients.
- 13 silver points were removed from 12 patients had been in place in the root canal from 9 months to 15 years.
- 4 cases were asymptomatic with no abnormalities, 1 case showed indistinct lamina dura, 5 cases were asymptomatic with PA pathosis, 1 case had overextended cone (2.5 mm), one was underextened (2.5mm).
- Analyses with the scanning electron microscope (SEM) and the X-ray microprobe were performed.
- tissue section from a biopsy specimen of case no. 1 was examined in the Xray analyzer and under SEM.
Most highlighted Results:
- Clinically, the cones showed surface changes ranging from dull to black and pitted.
- By SEM, the cones showed corrosive changes from pitting to deep circumferential erosion.
- Sulfur and silver were localized in biopsy tissue from the periapex that was associated with severe surface erosion.
- Measurement of sulfur and chlorine with the X-ray microprobe showed that these elements are present with decreasing concentrations at greater distances from the apex.
The results of this study indicate that silver cones undergo moderate to severe deterioration when placed as endodontic filling materials.