Scanning electron microscope study on the action of endodontic irrigants on bacteria invading the dentinal tubules

́rrez, J.H. Gutie; Jofré, A; Villena, Fernando Pardo-Manuel de

doi:10.1016/0030-4220(90)90385-6

Cited by 41 publications

(24 citation statements)

References 30 publications

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“…It is unlikely that the superior antimicrobial effect of NaOCl at both bur depths was caused by a carryover effect because the samples were rinsed twice with sodium thiosulfate to neutralize it before sampling. Although the actual depth of penetration by E. faecalis into the tubules was not verified in our study, our data suggest that NaOCl has the ability to penetrate into the dentinal tubules, which is consistent with previous studies (24,25).…”

Section: Discussionsupporting

confidence: 94%

The Antimicrobial Effect of MTAD, Sodium Hypochlorite, Doxycycline, and Citric Acid on Enterococcus faecalis

Krause

Liewehr

Hahn

2007

Journal of Endodontics

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Section: Discussionsupporting

confidence: 94%

The Antimicrobial Effect of MTAD, Sodium Hypochlorite, Doxycycline, and Citric Acid on Enterococcus faecalis

Krause

Liewehr

Hahn

2007

Journal of Endodontics

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“…In the fully prepared groups, however, the same energy density that achieved a moderately clean dentinal surface in the minimally prepared group produced a totally clean surface accompanied by morphological changes in the dentinal structures. Because NaOC1 is known to be an effective agent in the removal of organic tissue, one might conclude that it aided in the cleansing of the dentinal walls in this sample group of our study (12)(13)(14)(15). However, some studies have shown that NaOC1 appears to have no effect in removing smear layer when compared with samples not treated with NaOCI (3).…”

Section: Main Studymentioning

confidence: 70%

Effects of a 532 nm Q-switched nanosecond pulsed laser on dentin

Arrastia-Jitosho¹,

Liaw²,

Lee³

et al. 1998

Journal of Endodontics

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The purpose of this study was to determine whether a nanosecond-pulsed, frequency-doubled Nd:YAG laser emitting at 532 nm can be used as an altemaUve to mechanical methods of root canal treatment or as an adjunct to conventional endodontic preparation. Laser parameters whose thermal effects did not exceed safety thresholds for adjacent periodontal tissues were selected in a preliminary study. In 27 extracted human teeth, root canals were irradiated for 30 to 60 s at fluences of 2 to 2.2 J/cm2, and 10 Hz. Samples were observed using SEM. Laser irradiation could achieve smear layer removal after minimal manual preparation. However, results were inhomogeneous, and at higher energy densities thermal damage was observed, especially in the fully manually prepared samples. Nanosecond-pulsed irradiation at 532 nm can achieve complete smear layer removal. However, mechanisms must be developed to monitor laser effects and avoid potential damage to collateral structures.

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“…Various agents (101)(102)(103)(104)(105)(106) have been used to disinfect the tubules up to 220 m. These various agents or solutions were not effective on all types of bacteria. Weiger et al (107) studied the vitality of bacteria in infected human dentin tubules after treatment with an intracanal medication.…”

Section: Fate Of the Bacteria In Tubulesmentioning

confidence: 99%

The Role of Apical Instrumentation in Root Canal Treatment: A Review of the Literature

Baugh

Wallace

2005

Journal of Endodontics

144

113

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The issue of final apical preparation size remains controversial despite considerable clinical and in vitro research. The astute clinician must be aware of this research before choosing any instrumentation system because the informed clinician's decision must be guided by the best available evidenced-based information. This review article generated a Medline-based search strategy to disclose these studies and provides a critique and summary of the results.From the University of Pittsburgh School of Dental Medicine, Pittsburgh, Pennsylvania.Address request for reprints to Dean Baugh, DDS. E-mail address: baughdf@yahoo.com.Copyright © 2005 by the American Association of Endodontists T he most important objective of root canal therapy is to minimize the number of microorganisms and pathologic debris in root canal systems to prevent or treat apical periodontitis. This process of chemomechanical debridement, or cleaning of the root canal systems, has been described as the removal of all of the contents of the root canal systems before and during shaping. Grossman (1) described mechanical cleaning as the most important part of root canal therapy. Schilder (2) also considered cleaning and shaping as the foundation for successful endodontic therapy.Thorough instrumentation of the apical region has long been considered to be an essential component in the cleaning and shaping process. It was discussed as a critical step as early as 1931 by Groove (3). Simon (4) later recognized the apical area as the critical zone for instrumentation. Other authors (5, 6) concluded that the last few millimeters that approach the apical foramen are critical in the instrumentation process. Mechanical instrumentation and irrigation are sound endodontic principles and essential components of successful endodontics (7,8). Research has shown that mechanical instrumentation greatly reduces the number of microorganisms remaining in the root canal system. Mechanical instrumentation (9) has been shown to reduce bacterial count even without irrigants or dressings. A combination of mechanical instrumentation and irrigation (9, 10) further reduced the number of microorganisms by 100 to 1000 times. However, mechanical instrumentation with irrigation does not reliably disinfect an infected root canal system (11-14).Manufacturers developed nickel-titanium rotary instrumentation systems to facilitate the cleaning and shaping process. They are popular because of their apparent ease of use and reduced number of instruments. However, Spangberg (6) noted that the strong emphasis on reducing the number of instruments and limiting apical preparations to small sizes does not produce clean apical preparations in diseased teeth. Given this controversial and important topic, we conducted a broad-based Medline search of the literature to characterize the major factors involved in apical canal instrumentation. Table 1 provides the Medline search strategy used to identify relevant articles for this review. A secondary search was then conducted using the refere...

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Scanning electron microscope study on the action of endodontic irrigants on bacteria invading the dentinal tubules

Cited by 41 publications

References 30 publications

The Antimicrobial Effect of MTAD, Sodium Hypochlorite, Doxycycline, and Citric Acid on Enterococcus faecalis

The Antimicrobial Effect of MTAD, Sodium Hypochlorite, Doxycycline, and Citric Acid on Enterococcus faecalis

Effects of a 532 nm Q-switched nanosecond pulsed laser on dentin

The Role of Apical Instrumentation in Root Canal Treatment: A Review of the Literature

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