An in vitro comparison of the efficacy of the stepback technique versus a step-back/ultrasonic technique in human mandibular molars

Son

J Korean Acad Conserv Dent

et al. 2009

The aim of this in vitro study was to evaluate the cleaning efficacy of various irrigation methods in the mandibular mesial roots. The forty five mesial root canals were shaped by Profile .06 instruments to apical size #30 and irrigated with 5 ml of 3.5% NaOCl. The teeth were divided into 3 groups and irrigated finally for 1 minute; Group 1: syringe irrigation, Group 2: ultrasonic irrigation, Group 3: RinsEndo irrigation.After histological processing, the cross sections of apical 1, 3, and 5 mm level were examined with an optical microscope. The cleanliness values of canals and isthmuses were calculated and analyzed by MannWhitney U test.1. There were no significant differences in both canal and isthmus cleanliness between syringe irrigation and ultrasonic irrigation except 5 mm level of isthmus. 2. RinsEndo irrigation had significantly higher canal cleanliness values than syringe irrigation at 1 mm and 3 mm levels (p < 0.05). Also, RinsEndo irrigation had significantly higher isthmus cleanliness values than syringe irrigation at all levels evaluated (p < 0.05). 3. There were no statistical differences in both canal and isthmus cleanliness between ultrasonic irrigation and RinsEndo irrigation except 3 mm level of canal. From this study, RinsEndo irrigation can be useful as an additional irrigation procedure. [J Kor Acad Cons Dent 34(3):215-222, 2009]

Section: ⅳ Discussioncontrasting

confidence: 99%

Section: ⅰ Introductionmentioning

confidence: 88%

In vitro evaluation of cleaning efficacy of various irrigation methods in mandibular molars

Son

J Korean Acad Conserv Dent

et al. 2009

The Journal of Contemporary Dental Practice

“…Cavitation occurs at the ultrasonic file tip, whereas acoustic microstreaming occurs at the sides of the ultrasonically activated file. 13,[24][25][26] Sonic irrigation differs from ultrasonic irrigation in that the frequencies range from 1 to 6 kHz, which is lower as compared with ultrasonics (25-44 kHz). 27 In this study, the ultrasonically activated file was effective in eliminating the vapor lock but less effective than the EndoActivator, i.e., sonic system.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Apical Vapor Lock Formation and comparative Evaluation of its Elimination using Three different Techniques: An in vitro Study

Agarwal¹,

Deore²,

Rudagi³

et al. 2017

Aim:The aim of this study was (i) to evaluate the formation of air bubbles in the apical region of root canal (apical vapor lock) during syringe irrigation, using cone beam computed tomography (CBCT) and (ii) comparative evaluation of the elimination of an established vapor lock by EndoActivator, ultrasonics, and manual dynamic agitation (MDA), using CBCT. Materials and methods:A total of 60 extracted human singlerooted teeth were equally divided into three groups of 20 teeth each. The samples were decoronated 17 mm from the apex, cleaned, and shaped to size F4 Protaper using 3% sodium hypochlorite. Samples were irrigated with 3% sodium hypochlorite + cesium chloride radiopaque dye, and preoperative CBCT images were obtained. After formation of apical vapor lock in the scanned teeth, EndoActivator (group I), passive ultrasonic irrigation (group II), and MDA with K-file (group III) were performed and the teeth were again placed in CBCT scanner and results analyzed using the chi-square test. Results:The apical vapor lock was formed in all the samples. Out of the 20 teeth in each group, the apical vapor lock was eliminated in 18 samples of EndoActivator group (90%), 16 samples of ultrasonic group (80%), while it was eliminated in 10 samples by MDA (50%). Conclusion:It is concluded that (1) apical vapor lock is consistently formed during endodontic irrigation in closed canal systems and (2) sonic activation performs better than the ultrasonics and MDA in eliminating the apical vapor lock, with statistically significant difference between all the three groups (p < 0.05). Clinical significance:The results suggest that the apical vapor lock (dead water zone) is consistently formed during routine

“…The root canals were prepared with the conventional stepback technique using K-files (Maillefer, Ballaigues, Switzerland). 19 The master apical file was #35. After each instrument, the root canals were irrigated with 2 mL of 2.5% NaOCl (Golrang, Tehran, Iran) solution.…”

Section: Methodsmentioning

confidence: 99%

Effect of Synthetic Tissue Fluid on Microleakage of Grey and White Mineral Trioxide Aggregate as Root-End Filling Materials : An in Vitro Study

Lotfi¹,

Vosoughhosseini²,

Saghiri³

et al. 2012

SQUMJ

Objectives: The success of endodontic surgery has been shown to depend partly on the apical seal. Grey mineral trioxide aggregate (GMTA) produces hydroxyapatite twice as often as white mineral trioxide aggregate (WMTA) when suspended in a phosphate buffered saline (PBS) solution. The aim of this in vitro study was to compare the microleakage phenomenon of gray and white mineral trioxide aggregates as root-end filling materials after immersion in synthetic tissue fluid (STF). Methods: 55 single-rooted extracted maxillary anterior human teeth were divided into two experimental groups of 20 teeth each, plus 3 groups of 5 teeth each as two negative and one positive control groups. The root canals were cleaned, shaped, and laterally compacted with gutta-percha. The root ends were resected and 3 mm deep cavities were prepared. The root-end preparations were filled with GMTA or WMTA in the experimental groups. Leakage was determined using a dye penetration method. Data were analysed using analysis of variance (ANOVA) at the 0.05 level of significance. Results: The mean dye leakage was 0.40 ± 0.1 mm for GMTA and 0.50±0.1 mm for WMTA groups, respectively. There was no significant difference between the two experimental groups (P = 0.14). Conclusion: Despite the different properties and behaviours of GMTA and