Dentin Permeability: Determinants of Hydraulic Conductance

Reeder, O.W.; Walton, Richard E.; Livingston, Man J.; Pashley, David H.

doi:10.1177/00220345780570020601

Cited by 131 publications

(55 citation statements)

References 17 publications

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“…Since iodine compounds react easily with organic matter, it is conceivable that the presence of such a layer may decrease the antibacterial potential of the IPI. Also, the smear layer will reduce the potential surface area for solute diffusion over the dentin and thus influence the penetration of the IPI into the tubules (8,18 After the CH period, persisting bacterial growth was mainly quantified as "sparse" or "very sparse". As a mean, canals harboured 1.5 strains, and all but two of the recovered strains were recognised as facultatives.…”

Section: Discussionmentioning

confidence: 99%

The antimicrobial effect of calcium hydroxide in root canals pretreated with 5% iodine potassium iodide

Molander

Reit

Dahlén

1999

Dental Traumatology

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The antimicrobial effect of calcium hydroxide in root canals pretreated with 5% iodine potassium iodide Molander A, k i t C, Dahlen G. The antimicrobial effect of calcium hydroxide in root canals pretreated with 5% iodine potassium iodide. Endod Dent Traumatol 1999; 15: 205-209. 0 Munksgaard, 1999. Abstract -Calcium hydroxide (CH) is often used as a routine interappointment dressing during the endodontic treatment of teeth with apical periodontitis. However, it fails to consistently produce sterile root canals. The present study was set up to find out whether an antimicrobial strategy including the use of C H could be made more effective if: 1) canals were pretreated with 5% iodine potassium iodide (IPI), and 2) the dressing period was extended up to 2 months. Fifty human teeth, with radiographically verified apical periodontitis, were microbiologically sampled. After chemomechanical preparation the canals were pretreated with IPI for 3-7 days. Teeth where microorganisms persisted were then treated with C H for 2 months. Following instrumentation and dressing with IPI, 43 bacterial strains were recovered in 22 of the teeth. Samples obtained after the C H dressing period disclosed growth of 13 facultative and two strict anaerobic strains in 10 teeth. Enterococcus faecalis was identified in two specimens. In conclusion, the present study gave no evidence for an increased antimicrobial effect of C H if it was left for longer periods in the root canal. Although pretreatment with IPI from a quantitative point of view did not seem to add antimicrobial power, it might reduce the frequency of persisting strains of E. faecalis.The aim of modern endodontic treatment of teeth with apical periodontitis is total elimination of intracanal microbes. Data show that relatively few root canals will be bacteria free following only mechanical instrumentation (l), and that an interappointment dressing therefore is needed. Calcium hydroxide paste (CH) is considered the most effective dressing currently in use. However, it fails to consistently produce sterile root canals (2, 3). Few microorganisms will survive when directly exposed to CH, but several factors may impair its antimicrobial potency in the root canal. For example, complex anatomy will make it difficult to satisfactorily pack the whole canal system with C H paste (4, 5). Therefore, longer periods of time than those usually recommended (1-2 weeks) A. Molanderl, C. Reit', 6. Dahlen2

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Section: Discussionmentioning

confidence: 99%

The antimicrobial effect of calcium hydroxide in root canals pretreated with 5% iodine potassium iodide

Molander

Reit

Dahlén

1999

Dental Traumatology

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“…1). Dentin discs with a periphery of enamel were obtained (5). The discs were reduced in thickness on both the pulpal and enamel sides with wet 600-grit silicon carbide paper (3M do Brasil, Sumaré, SP, Brazil) until reaching 0.92 ± 0.08 mm in thickness, as measured by a micrometer accurate to 0.01 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Because the micropipette has constant bore diameter, dividing the pipette volume by its length gives a proportionality constant that converts linear displacement into volume displacement within dentin (5).…”

Section: Methodsmentioning

confidence: 99%

Effect of commercially available and experimental potassium oxalate-based dentin desensitizing agents in dentin permeability: influence of time and filtration system

Santiago

Pereira

Martineli³

2006

Braz. Dent. J.

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This study evaluated the influence of time after application of oxalate solutions in reducing dentin hydraulic conductance. Fifty dentin discs were obtained from extracted human third molars and assigned to 5 groups (n=10), according to the desensitizing agent used: Group I: OxaGel; Group II: experimental agent DD-1: Group III: experimental agent DD-2. In Groups IV and V, a placebo gel and deionized water were used as control, respectively. The agents were applied for 3 min, washed out and the hydraulic conductance was measured immediately and at 5-, 15-and 30-min intervals, and after acid etching. Data were analyzed statistically by two-way ANOVA and Duncan's test at 5% significance level. Groups I, II and III did not differ significantly from each other in any of the time intervals (p>0.05). Likewise, Groups IV and V were statistically similar to each other (p>0.05). The active agents reduced significantly dentin permeability in comparison to control groups (p<0.05). Dentin permeability measured in vitro decreased significantly with time regardless of the agent applied (either active or control agents). The results of Group V, in which no dentin desensitizing agent was employed, indicates that the assessment of dentin permeability by this method must be interpreted with caution.

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“…According to the hydrodynamic mechanism, the ease of flow of the dentinal fluid through dentin, i.e., hydraulic conductance, depends a great deal on the number and diameter of the dentinal tubules at the dentin surface [31]. The dentin near the pulp and the deep dentin have greater numbers of dentinal tubules per unit area and wider diameters, which are more permeable than the superficial dentin [32].…”

Section: Recording From A-fibersmentioning

confidence: 99%