ABSTRACT
This study sought to evaluate the microleakage of two Kerr root canal sealers (old and new formulas of the Pulp Canal Sealer). Sixty anterior teeth were used. After cleaning and shaping to a size 30 file, the teeth were obturated with the vertical condensation of gutta-percha with either the old or the new root canal sealer. Apical microleakage was determined using pressurized fluid filtration at 90 min, 1 day, and 1, 4, 12, 18, and 24 wk after root canal obturation. The results showed that leakage tended to increase over time for the two groups. Also, no significant difference was found in microleakage between the old and the new formulas of the root canal sealer.
Subject(s)
Dental Leakage/prevention & control , Root Canal Filling Materials/therapeutic use , Zinc Oxide-Eugenol Cement/therapeutic use , Analysis of Variance , Confidence Intervals , Dye Dilution Technique , Humans , In Vitro Techniques , Materials Testing/statistics & numerical data , Time FactorsABSTRACT
The purpose of this study was to compare the quality of the coronal seal of lateral and vertical condensations after removal of the coronal gutta-percha with two different techniques. One hundred single-rooted human teeth with one root canal were used. After cleaning and shaping, the teeth were divided into 4 equal groups. In groups 1, 3 and 2, 4 vertical and lateral condensations were performed respectively. Then, the coronal portion of gutta-percha was removed with heat-carriers alone for groups 1 and 2 and with heat-carriers and compaction for groups 3 and 4. Apical microleakage was determined using pressurized fluid filtration measured at different time intervals up to 24 wk. The results showed that the alternation of heat-carriers and compaction enhances the quality of the coronal seal. The obturation with the vertical condensation technique resulted in a better seal independently of the gutta-percha removal technique.
Subject(s)
Dental Leakage/prevention & control , Gutta-Percha , Root Canal Obturation/methods , Analysis of Variance , Humans , Retreatment , Tooth CrownABSTRACT
The purpose of this study was to compare the degree of anesthesia obtained with 2% lidocaine with three different concentrations of epinephrine for inferior alveolar nerve block. Using a repeated measures design, 30 subjects randomly received an inferior alveolar injection using masked cartridges of each solution at three successive appointments. The first molar, first premolar, lateral incisor, and contralateral canine (control) were blindly tested with an Analytic Technology pulp tester at 3-min cycles for 50 min. No statistically significant differences in success and failure were found among the 1:50,000, 1:80,000, and 1:100,000 concentrations of epinephrine.
Subject(s)
Anesthesia, Dental/methods , Epinephrine/administration & dosage , Lidocaine , Mandibular Nerve , Nerve Block/methods , Adult , Chi-Square Distribution , Dose-Response Relationship, Drug , Drug Combinations , Evaluation Studies as Topic , Female , Humans , Male , Middle Aged , Statistics, Nonparametric , Time FactorsABSTRACT
The purpose of this study was to measure the degree of anesthesia following the administration of 3.6 ml of 2% lidocaine solutions with either 1:50,000, 1:80,000, or 1:100,000 for inferior alveolar nerve block and to compare the results with those obtained following the administration of 1.8 ml of the same solutions (1). With the use of a repeated measures design, 30 subjects randomly received an inferior alveolar injection at three successive appointments. The first molar, first premolar, lateral incisor, and contralateral canine (control) were blindly tested with an Analytic Technology pulp tester at 3-min cycles for 50 min. The degree of anesthesia was comparable for the three solutions following the administration of 3.6 ml of each solution. Retrospective evaluation showed that the volume of the solution influenced the degree of anesthesia.
Subject(s)
Anesthetics, Local , Lidocaine , Mandibular Nerve/drug effects , Nerve Block/methods , Adult , Anesthetics, Local/administration & dosage , Bicuspid/innervation , Female , Humans , Incisor/innervation , Lidocaine/administration & dosage , Male , Middle Aged , Molar/innervation , Retrospective Studies , Single-Blind Method , Treatment OutcomeABSTRACT
This study sought to evaluate on a long-term basis the quality of the apical seal of the vertical condensation performed by three operators with different levels of proficiency in vertical compaction. Ninety anterior teeth were used. After cleaning and shaping to a size 30 file, the teeth were divided into three equal groups. Then, vertical condensation was performed. Apical microleakage was determined using pressurized fluid filtration at 90 min, 1 day, and 1, 4, 12, 18, and 24 wk after root canal obturation. Leakage tended to increase over time for the three groups. Teeth obturated by an inexperienced operator showed greater long-term leakage.
