A Comparative Study to Evaluate the Effect of Ultrasonic Agitation on Push - Out Bond Strength of Three Root-End Filling Materials: An In Vitro Study (original) (raw)
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Restorative dentistry & endodontics, 2018
This study evaluated the effect of ultrasonic agitation of mineral trioxide aggregate (MTA), calcium silicate-based cement (CSC), and Sealer 26 (S26) on adaptation at the cement/dentin interface and push-out bond strength. Sixty maxillary canines were divided into 6 groups ( = 10): MTA, S26, and CSC, with or without ultrasonic activation (US). After obturation, the apical portions of the teeth were sectioned, and retrograde cavities were prepared and filled with cement by hand condensation. In the US groups, the cement was activated for 60 seconds: 30 seconds in the mesio-distal direction and 30 seconds in the buccal-lingual direction, using a mini Irrisonic insert coupled with the ultrasound transducer. After the materials set, 1.5-mm thick sections were obtained from the apexes. The presence of gaps and the bond between cement and dentin were analyzed using low-vacuum scanning electron microscopy. Push-out bond strength was measured using a universal testing machine. Ultrasonic ag...
Effect of sonic versus ultrasonic activation on aqueous solution penetration in root canal dentin
Journal of Oral Research, 2018
The aim of this study was to observe the penetration of an aqueous solution into the root canal dentin under sonic activation and ultrasonic activation. Materials and Method: This study consisted of experimental in vitro research. In order to achieve a closed system, the apex of 45 single-rooted teeth was sealed with wax. The step-back technique was manually performed using a K50 apical master file and 3 groups were organized according to the protocol of the final irrigant activation: Group I: non-activated Chinese ink for 30 seconds, Group II: Chinese ink sonically activated with EndoActivator for 30 seconds, and Group III: Chinese ink ultrasonically activated with Varios 350 equipment for 30 seconds. Teeth were sectioned longitudinally, and the samples obtained were observed under a stereomicroscope at 1X magnification in order to be photographed and scanned to calculate the penetration area using the Image J software. The tinted radicular area was evaluated in relation to the total area of the root dentin. The Tukey's post-hoc test and ANOVA were used for the statistical analysis (p<0.05). Results: Group I and II obtained 9.13% and 9.42% penetration respectively, while in group III the highest degree of dye infiltration was achieved (13.9%), being statistically significant (p<0.001). Conclusions: Ultrasonic activation produced a significantly higher penetration of the dye when compared to conventional activation and sonic activation.
Srpski arhiv za celokupno lekarstvo, 2008
INTRODUCTION The basic work principle of all ultrasonic techniques is the piezoelectric effect of producing high frequency ultrasounds of small length, which are transmitted over the endodontic extensions or canal instruments into the root canal. When in contact with the tissue, ultrasonic vibrations are converted into mechanical oscillations. Ultrasonic waves and the obtained oscillations along with the synergic effect of irrigation bring about the elimination of smear layer from the root canal walls. OBJECTIVE The aim of the study was to ultrastucturally examine the effect of smear layer removal from the walls of canals by the application of the active ultrasonic method without irrigation, that is by the application of ultrasound and irrigation using distilled water and 2.5% NaOCl. METHOD The investigation comprised 35 single-canal, extracted human teeth. After removal of the root canal content, experimental samples were divided into three groups. According to the procedure requir...
Revista de Odontologia da UNESP, 2016
Introduction The aim of endodontic retreatment is to remove the previous root filling materials completely to allow for the subsequent steps of cleaning, canal shaping and filling replacement. Objective To evaluate the efficacy of passive ultrasonic irrigation (PUI) in the removal of residual root filling material after removing the bulk of the root filling with nickel-titanium rotary instruments. Material and method Eighteen mesial isthmus-containing roots of human mandibular molars were prepared and filled. The root canal filling was removed with the ProTaper Retreatment system and K-files. The specimens were randomized into 2 groups (n = 9), both irrigated with 2.5% NaOCl and 17% EDTA. In the conventional group, an irrigation syringe was used. In the PUI group, the PUI technique was used. The roots were sectioned longitudinally and evaluated under stereomicroscopy. Student’s t test was used to compare groups and the general linear model was used to compare the apical, cervical, a...
Ultrasonic root-end preparation Part 2, Microleakage of EBA root-end fillings
International Endodontic Journal, 1994
The effect of three methods of root-end preparation. foUowing apical resection, on the apical seal of root-end fillings, was studied in vitro. Root canals of 116 singlerooted teeth with mature apices were prepared chemomechanically and obturated with gutta-percha and sealer. The root ends were resected with a diamond hur under water coolant and were prepared as follows: group I a size 010 round hur was used to prepare an apical cavity 2-3 mm down the long axis ofthe root; group n treatment as per group 1 followed by a 60-s rinse with a solution of 10:3 (10% citric acid: 3% Fe2Cl3); and group ID an ultrasonic retrotip was used to prepare a 2-3 mm deep apical cavity. The root end was restored with an EBA cement. Apical leakage was determined using India ink after 7 days and 7 months. The teeth were demineralized, rendered transparent and linear dye penetration was recorded. Results showed that there was no significant difference in leakage between the groups at each time interval (P>0.05) but there was increased leakage after 7 months (P<0.01). Cracking of the root surface was seen most often with the ultrasonically prepared roots (P<0.001).
JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2020
Introduction: Endodontic treatment failures are caused by persistent or secondary intraradicular infection due to inefficient treatment or re-infection of the obturated root canal system because of coronal or apical leakage. Complete removal of Gutta-Percha (GP) from the root canal system is essential during retreatment procedures in order to re-establish healthy periapical tissues. Many techniques and materials have been advocated in root canal-treated teeth to remove the obturating materials. However, residues of the filling materials have been observed on the canal walls in all the techniques. Therefore, this study was designed to explore the application of passive ultrasonic activation in the removal of gutta-percha and epoxy resin based root canal sealer during endodontic retreatment by rotary and hand instruments. Aim: To evaluate the efficacy between passive ultrasonic activation assisted hand vs. rotary retreatment files in the removal of gutta-percha and sealer during endodontic retreatment. Materials and Methods: The current study was an experimental in vitro study where all the procedures were carried out in extracted human teeth from October 2018 till February 2019. Forty extracted human single rooted teeth were selected. The root canals were prepared using ProTaper Next rotary files and obturated by a hybrid warm gutta-percha technique. They were divided into four groups of ten specimens each based on the retreatment procedures: Group 1: H-files, Group 2: H-files and passive ultrasonic activation of xylene, Group 3: ProTaper Universal retreatment files and Group 4: ProTaper Universal retreatment files and passive ultrasonic activation of xylene. The specimens were sectioned buccolingually after retreatment procedure and viewed under stereomicroscope for evaluating the percentage of remaining gutta-percha. Data obtained was subjected to Normality tests. Further statistical analysis was done using one-way ANOVA followed by Tukey Kramer Test for pairwise comparisons. Results: Irrespective of the technique, all the specimens showed residual filling materials on the canal walls. ProTaper Universal retreatment files with or without ultrasonic activation of solvent showed significantly (p<0.05) less filling material remnants when compared to H-files with/without ultrasonic activation of solvent. Conclusion: Rotary instrumentation supplemented with passive ultrasonic activation was found to be more efficient in removing root canal filling materials.
2021
The purpose of this study was to analyze the effects of ultrasonic activation on the bond strength of a calcium silicate-based sealer and a calcium silicate pozzolan-based sealer after a root canal procedure. 32 first premolar teeth extracted for orthodontic reasons were divided into four groups. Group 1 had a calcium silicate-based sealer, group 2 had a calcium silicate sealer with ultrasonic activation, group 3 had a calcium silicate pozzolan-based sealer, and group 4 had a calcium silicate pozzolanbased sealer with ultrasonic activation. An ultrasonic scaler and tip was used for the activation. The machine push-out bond strength of each group was measured to determine their connective strength. The stereomicroscope camera was used to determine the failure. Statistical Analysis: A one-way ANOVA test and post-hoc Tamhane test were used to statistically analyze the results (p = 0.05). There was a significant difference between calcium silicate-based sealer and calcium silicate pozzo...
Evaluation of Root-End Preparation with Two Different Endodontic Microsurgery Ultrasonic Tips
Biomedicines
The aim of this study is to compare root-end preparation performed with two different ultrasonic tips—CVDentus and NSK—and respective time requirements. After root-end resection, 32 teeth were randomly divided in two groups, according to the ultrasonic tip used for root-end preparation. Preparation time was recorded. Photomicrographs were taken to assess the following parameters: root surface microcracking, marginal integrity and presence of debris. One ultrasonic tip from each group was analyzed through scanning electron microscopy before and after root-end preparation. The significance level was set at α = 0.05. Incidence of microcracks in both groups was 12.5%. Solely intracanal microcracking was found, consistently positioned within the widest side of the remaining dentine. No statistically significant differences were verified between both experimental groups regarding marginal integrity (p = 0.102) and preparation time (p = 0.780), whereas statistical differences (p = 0.003) w...
Ultrasonic Activation of a Bioceramic Sealer and Its Dentinal Tubule Penetration: An In Vitro Study
Annals of International medical and Dental Research, 2018
Background: The root canal sealers form an important component of the three dimensional obturation of the root canals. Moreover, the penetration of the sealers into the dentinal tubules is a desirable phenomenon for their adequate sealing and antibacterial action. The aim of this study was to evaluate the effects of ultrasonic activation on the intratubular penetration of bioceramic root canal sealer. Methods: Eighty extracted human mandibular premolars were divided into 2 groups (n =40) according to the sealer activation method used to obturate the root canals instrumented with F3 Pro-Taper instruments .The canals were obturated using Protaper F3 guttapercha cones. Previously, the bio ceramic sealer was labeled with rhodamine B dye to allow analysis under a confocal microscope. The two groups were: UA (ultrasonically activated) and NA (no activation; control). All samples were sectioned at 3 and 8 mm from the apex. The percentages of dentinal sealer penetration segments of canal were analyzed. Results: Students T test was performed for the statistical analysis and we found that there was a significant increase in tubular penetration for the ultrasonic activation group.Conclusion: Use of ultrasonic activation of a bioceramic sealer promoted greater dentinal sealer penetration.