salicylates and Smear-Layer

The aim was to compare the percentage and depth of sealer penetration into dentinal tubules during obturation using Sealer 26, GuttaFlow, or Sealapex in root canals filled with the lateral compaction technique.. Thirty root canals filled with the lateral compaction technique using GuttaFlow (n = 10), Sealapex (n = 10), or Sealer 26 (n = 10) were analyzed using confocal microscopy. The teeth were sectioned at 3 and 5 mm from the apex, and statistical analyses was performed using analysis of variance-Tukey test (P < .05).. Sealapex showed the deepest sealer penetration at both levels evaluated (P < .05). No statistically significance was found between Sealer 26 and GuttaFlow at the 3 mm and 5 mm levels. No statistical significance was found in the percentage of penetration around the root canal wall among the 3 sealers evaluated at both levels.. Although Sealapex displayed deeper penetration into the dentinal tubules there was no difference in the percentage of adaptation to the root canal walls among the 3 sealers evaluated.

Topics: Bismuth; Calcium Hydroxide; Dental Marginal Adaptation; Dental Pulp Cavity; Dentin; Dimethylpolysiloxanes; Drug Combinations; Fluorescent Dyes; Gutta-Percha; Humans; Materials Testing; Microscopy, Confocal; Rhodamines; Root Canal Filling Materials; Root Canal Irrigants; Root Canal Obturation; Root Canal Preparation; Salicylates; Smear Layer; Surface Properties; Tooth Apex

The sealing of the root canal system is of fundamental importance for successful endodontic treatment. To obtain an adequate apical seal, many factors must be considered such as the presence of smear layer and the sealer applied. After canal preparation, this layer must be removed because it prevents close contact between the dentinal walls and the sealing material. The goal of this study was to evaluate the sealing ability of four different sealers after smear layer removal with either 17% EDTA-T irrigation or Er:YAG laser irradiation of 46 teeth. The canals were sealed with four different sealers: Sealapex, Ketac Endo, AH Plus and N-Rickert. The method for smear layer removal did not influence apical sealing. AH Plus and N-Rickert allowed less dye leakage when compared to Sealapex and Ketac Endo.

Topics: Calcium Hydroxide; Chelating Agents; Coloring Agents; Dental Bonding; Dental Leakage; Dentin; Edetic Acid; Epoxy Resins; Glass Ionomer Cements; Gutta-Percha; Humans; Laser Therapy; Lasers, Solid-State; Materials Testing; Methylene Blue; Root Canal Filling Materials; Root Canal Preparation; Salicylates; Smear Layer

Minimal tooth preparation is required for porcelain laminate veneers, but an interim restoration is anticipated by patients to protect their teeth against thermal insult, chemical irritation, and to provide esthetics. Cement remaining after the removal of the provisional restoration can impair the etching quality of the tooth surface and the fit and final bonding of the porcelain laminate veneer.. This in vitro study inspected the tooth surface for remaining debris from cement after removal of a provisional restoration.. Seventy-two extracted natural anterior teeth were prepared for porcelain laminate veneers. For half of the teeth, the smear layer was removed before luting provisional restorations. Veneer provisional restorations were fabricated and luted to teeth with 3 bonding methods: temporary eugenol-free cement, spot etching combined with dual-curing luting cement, and polyurethane adhesive combined with dual-curing luting cement. After removal of provisional restorations 1 week later, the tooth surface was examined for residual luting material with an SEM.. Traces of cement debris were found on provisionally prepared teeth for all 3 material methods.. The use of polyurethane adhesive combined with the dual-curing cement revealed significantly less teeth with debris than the other methods. This difference was less distinct when the smear layer was removed.

Topics: Acid Etching, Dental; Composite Resins; Dental Bonding; Dental Cements; Dental Debonding; Dental Restoration, Temporary; Dental Stress Analysis; Dental Veneers; Drug Combinations; Fatty Acids; Humans; Incisor; Materials Testing; Microscopy, Electron, Scanning; Polyurethanes; Resin Cements; Resins, Plant; Salicylates; Smear Layer; Surface Properties; Thymol; Zinc Oxide

The purpose of this study was to examine the effect of the smear layer on the penetration depth of Sealapex, Roth 811, and CRCS root canal sealers into the dentinal tubules. Forty recently extracted, human single-rooted teeth were used. The crowns were cut and removed at the cemento-enamel junction level and the root canals were prepared to a #60 K-file. The teeth were then randomly divided into two groups of 20, group A and group B. The smear layer was removed from all teeth in group A with EDTA and NaOCl. The smear layer remained in all teeth in group B. Two roots in each group were used as controls. Six roots from each group were obturated with Roth 811 sealer and gutta-percha through lateral condensation. The same process was repeated using sealers CRCS and Sealapex. Each root was then divided in two and prepared for scanning electron microscope observation. The removal of the smear layer allowed penetration of all three sealers into the dentinal tubules to a depth of between 35 microns and 80 microns. Although the CRCS sealer penetrated only up to the 35 mm point, it offered better or complete obturation of the dentinal tubules. The presence of smear layer at the root canal walls obstructed the penetration of all sealers into the dentinal tubules.

Topics: Adult; Analysis of Variance; Calcium Hydroxide; Dentin; Dentin Permeability; Edetic Acid; Humans; Microscopy, Electron, Scanning; Root Canal Filling Materials; Root Canal Irrigants; Salicylates; Smear Layer; Sodium Hypochlorite; Zinc Oxide; Zinc Oxide-Eugenol Cement

The effect of root canal filling pastes containing calcium oxide resp. calcium hydroxide on the alkalinity of extracted human teeth was investigated using a colour indicator (cresol red). An aqueous suspension of calcium hydroxide (Pulpdent), which is normally used for temporary root canal filling, most consistently produced alkalinity. Removal of the smear layer following instrumentation of the root canal led to increased proportion of alkaline-positive spots in dentinal locations distant from the canal. A clearly smaller effect was found with a calcium salicylate cement (Sealapex) and an oil-paste (Gangraena Merz), both of which are available for definite root canal fillings. Following removal of the smear layer, these hard-setting preparations caused moderate alkalinity in dentin adjacent to the canal but no effect was observed in locations more distant from the canal. Neither at locations adjacent to nor distant from the root canal was alkalinity found when another calcium salicylate cement (Apexit) was used. Apparently the release of hydroxyl ions into root dentin from calcium hydroxide containing root canal filling materials is not solely influenced by the absolute amount of calcium hydroxide, but also depends on other ingredients which variably inhibit the release of these ions.

Topics: Binomial Distribution; Calcium Hydroxide; Dental Cements; Dentin; Humans; Hydrogen-Ion Concentration; Likelihood Functions; Root Canal Filling Materials; Salicylates; Smear Layer; Tooth Root

The aim of this in vitro study was to assess the sealability of a recently introduced thermoplasticized gutta-percha technique (Trifecta, Hygenic Corp., OH, USA) in the presence or absence of a smear layer. A total of 100 teeth with single straight root canals were included in the study. The teeth were decoronated and the canals prepared with a modified double-flared technique under constant irrigation with 2.5% sodium hypochlorite solution. The apical matrix was prepared to size 40 and apical patency subsequently confirmed with a size 10 file. Four teeth were discarded for technical reasons and the remaining 96 allocated randomly into two groups of 44 teeth and a group of eight teeth which acted as controls. Canals in group 1 were obturated randomly with either cold lateral condensation of gutta-percha or with the Trifecta technique. Canals in Group 2 were rinsed with 17% REDTA to remove the smear layer and then obturated with lateral condensation or the Trifecta technique. All teeth were suspended in India ink for 9 days, demineralized, and rendered transparent prior to the assessment of apical linear dye penetration. Apical extrusion of sealer and gutta-percha occurred commonly but there was no significant difference between the four obturation groups. However, overall, there was significantly more extrusion of sealer with the Trifecta technique compared with lateral condensation (P < 0.05). The majority of canals (79 out of 88) had no evidence of apical leakage and there was no significant difference between the groups.(ABSTRACT TRUNCATED AT 250 WORDS)

Topics: Calcium Hydroxide; Chi-Square Distribution; Dental Leakage; Gutta-Percha; Hot Temperature; Humans; Root Canal Obturation; Salicylates; Smear Layer; Statistics, Nonparametric