A scanning electron microscope examination of silver cones removed from endodontically treated teeth

Seltzer, Samuel; Green, Daniel B.; Weiner, Neil; DeRenzis, Frank A.

doi:10.1016/0030-4220(72)90373-8

Cited by 63 publications

(12 citation statements)

References 7 publications

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“…44 After transport process, gold ions combine readily with intracellular fluids to form a relatively insoluble compound that indicated as black particles in TEM. 45,46,47 It has been demonstrated that Gram-positive bacterial cell wall is more efficient metal chelators because it contains a thick peptidoglycan layer responsible for bacterial adhesion to surfaces. 44 One of the microbial responses to metals is the synthesis of intracellular metal-binding proteins.…”

Section: Discussionmentioning

confidence: 99%

The growth of Staphylococcus aureus and Escherichia coli in low-direct current electric fields

et al. 2013

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Electrical potentials up to 800 mV can be observed between different metallic dental restorations. These potentials produce fields in the mouth that may interfere with microbial communities. The present study focuses on the impact of different electric field strengths (EFS) on the growth of Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 25922) in vitro. Cultures of S. aureus and E. coli in fluid and gel medium were exposed to different EFS. Effects were determined by calculation of viable counts and measurement of inhibition zones. In gel medium, anodic inhibition zones for S. aureus were larger than those for E. coli at all field strength levels. In fluid medium, the maximum decrease in the viable count of S. aureus cells was at 10 V⋅m−1. Field-treated S. aureus cells presented ruptured cell walls and disintegrated cytoplasm. Conclusively, S. aureus is more sensitive to increasing electric field strength than E. coli.

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Section: Discussionmentioning

confidence: 99%

The growth of Staphylococcus aureus and Escherichia coli in low-direct current electric fields

et al. 2013

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“…In these cases and colleagues, the thermal sensitivity may have been due in part to periapical percolation and irritation from the oxidation by‐products from the corroded silver cones ( Fig. 5) ( Seltzer et al . 1972 ).…”

Section: Discussionmentioning

confidence: 98%

“…It is not the purpose of this article to debate this issue, but overextended silver cones would appear to dispose to a predictable failure due to their contact with the periradicular tissues or oral fluids ( Fig. 6) ( Seltzer et al . 1972 , Goldberg 1981).…”

Section: Discussionmentioning

confidence: 99%

Thermal sensitivity of endodontically treated teeth

et al. 1999

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The problem of thermal sensitivity following non-surgical root-canal treatment is explored and case reports are presented. Possible causes for post-treatment discomfort from endodontic and restorative aetiologies are discussed, as are the mechanisms to explain the patients' painful experiences. Treatment of this problem may vary from the simple replacement of a defective restoration to a more extensive non-surgical retreatment of the case, despite radiographic evidence of an acceptable root filling and normal periradicular tissues.

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“…Although a good apical barrier is important (18), insufficient coronal obturation may lead to bacterial contamination (19). For this reason, apical and coronal microleakage has become an important issue in endodontic research (20), and was therefore examined in the present study.…”

Section: Discussionmentioning

confidence: 99%

Comparison of apical and coronal sealing in canals having tapered cones prepared with a rotary NiTi system and stainless steel instruments

Koçak

Yaman

2009

J Oral Sci

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The purpose of this study was to compare the sealing ability of different tapered gutta percha cones that were used with lateral compaction and single cones in canals prepared with various root canal instruments. One hundred extracted maxillary incisor roots were used. In group 1, 30 roots were prepared with stainless steel instruments (SS) and then filled by the lateral compaction technique using .02 tapered master cones. In group 2, 30 roots were prepared with ProFile ® nickel titanium instruments (NiTi) and filled in the same way as group 1. In group 3, 30 roots were filled by the single cone technique using 0.06 tapered guttapercha cones. The remaining 10 teeth were taken as two control groups. Apical and coronal leakage was evaluated using the fluid filtration model. Considering the effects of the instrumentation, no statistically significant differences were found between the groups prepared with SS and NiTi (P > 0.05). When the effects of obturation technique were taken into consideration, the ProFile ® instruments and lateral compaction resulted in significantly less coronal leakage than the SS instruments and lateral compaction (P < 0.05). There were no significant differences in apical leakage among any of the groups (P > 0.05). (J Oral Sci 51, 103-107, 2009) Keywords: profile instruments tapered gutta-percha; apical and coronal sealing.

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A scanning electron microscope examination of silver cones removed from endodontically treated teeth

Cited by 63 publications

References 7 publications

The growth of Staphylococcus aureus and Escherichia coli in low-direct current electric fields

The growth of Staphylococcus aureus and Escherichia coli in low-direct current electric fields

Thermal sensitivity of endodontically treated teeth

Comparison of apical and coronal sealing in canals having tapered cones prepared with a rotary NiTi system and stainless steel instruments

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