scholarly journals Apical displacement produced by rotary nickel-titanium instruments and stainless steel files

2004 ◽  
Vol 12 (1) ◽  
pp. 51-55 ◽  
Author(s):  
José Roberto Vanni ◽  
Diana Santana de Albuquerque ◽  
Cristina Reiss ◽  
Flares Baratto Filho ◽  
Orlando Limongi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Mean Value ◽  
Nickel Titanium ◽  
Mean Values ◽  
Root Canals ◽  
Group 4 ◽  
Group 5 ◽  
Group 2 ◽  
File Series ◽  
Apical Displacement

The aim of this study was to evaluate the apical displacement produced by different rotary nickel-titanium instruments, testing the hypothesis that rotary systems with nickel-titanium instruments produce lower mean values of apical displacement than stainless steel hand instruments. A total of 100 maxillary permanent first molars were selected for the study. The mesiobuccal roots were sectioned at the top cervical third and embedded in blocks of self-curing resin. The specimens were randomly divided into 5 groups and the root canals were prepared using the following nickel-titanium instruments: Group 1 - Quantec system 2000 (Analytic Endodontics, Mexico); Group 2 - Pro-File T.0.04 (Dentsply/Maillefer, Switzerland); Group 3 - Pro-File Series 29 T.0.04 (Dentsply Tulsa, Switzerland); Group 4 - Pow-R T.0.02 (Moyco-Union Broach, USA). Specimens in Group 5 were prepared using stainless steel hand instruments Flexofile (Dentsply/Maillefer, Switzerland). All root canals were previously submitted to cervical preparation using Orifice Shaper instruments #1, 2, 3 and 4 (Dentsply/Maillefer, Switzerland). After odontometry, the remaining root canal was shaped employing increasingly larger instruments, so that the final instrument corresponded to Quantec #9, Pro-File Series 29 #6, and #35 for the other groups. Specimens in Groups 1 to 4 were prepared using an electric handpiece with 16:1 reduction at 350 rpm. The specimens in Group 5 were manually prepared. Apical displacement was measured and recorded by means of radiographic superimposition on a specific desk. Statistical analysis (ANOVA) of the results revealed that all groups presented apical displacements. Considering only the nickel-titanium instruments, Group 4 showed the lowest mean value while Groups 2 and 3 produced the highest mean apical displacement values (p<0.001).

scholarly journals Influence of Dentin Deproteinization on Bonding Degradation: 1-year Results

2016 ◽  
Vol 17 (12) ◽  
pp. 985-989 ◽  
Author(s):  
Carlos Rocha Gomes Torres ◽  
Eduardo Bresciani ◽  
César R Pucci ◽  
Natália R Barbosa ◽  
Karen CK Yui ◽  
...  
Keyword(s):  
Sodium Hypochlorite ◽  
Longitudinal Shear ◽  
Negative Influence ◽  
Single Bond ◽  
Hybrid Layer ◽  
Mean Values ◽  
Group 4 ◽  
Hydrolysis Process ◽  
Group 5 ◽  
Group 2

ABSTRACT Introduction The decalcification protocol of dentin surface with sodium hypochlorite removes the exposed collagen fibrils and could improve the longevity of the bonding interface. This study evaluated the influence of collagen removal with 10% sodium hypochlorite (10% NaOCl) on the longitudinal shear bond strength (SBS) of adhesives to dentin. Materials and methods Seventy-two extracted human molars were sectioned and the buccal and lingual surfaces were flattened and acid etched with 37% phosphoric acid for 15 seconds. The specimens were divided into six groups (n = 12 teeth – 24 sections), according to adhesive and collagen removal protocol: group 1: UNO Dentastic; group 2: Prime and Bond NT; group 3: Single Bond; group 4: 10% NaOCl + UNO Dentastic; group 5: 10% NaOCl + Prime and Bond NT; group 6: 10% NaOCl + Single Bond. Composite Z100 buildup was prepared, and the SBS test was assessed after 24 hours and 1 year. Data were submitted to three-way analysis of variance (ANOVA) and Tukey tests (p < 0.05). Results The mean values (MPa) were for 24 hours: G1: 22.45B; G2: 7.90DE; G3: 12.56CD; G4: 19.85BC; G5: 33.73A; G6: 20.77B; and for 1 year: G1: 2.43E; G2: 2.26E; G3: 4.3DE; G4: 18.79BC; G5: 26.49AB; G6: 22.73B. Conclusion Dentin deproteinization treatment with 10% NaOCI influenced the SBS compared with conventional treatment. The negative influence on SBS detected for conventional groups at 1-year interval was not detected for deproteinized groups. Clinical relevance The longevity of hybrid layer is critical due to the hydrolysis process at the adhesive interface over time. The use of 10% NaOCl deproteinization protocol might improve the longevity of bonding in adhesive restorations. How to cite this article Pucci CR, Barbosa NR, Bresciani E, Yui KCK, Huhtala MFRL, Barcellos DC, Torres CRG. Influence of Dentin Deproteinization on Bonding Degradation: 1-year Results. J Contemp Dent Pract 2016;17(12):985-989.

scholarly journals Comparison of Microleakage of Pedo Jacket Crowns and Stainless Steel Crowns Cemented with Different Cements

2019 ◽  
Author(s):  
Mona Sohrabi ◽  
Sara Ghadimi ◽  
Bahman Seraj
Keyword(s):  
Stainless Steel ◽  
Mean Value ◽  
Resin Cement ◽  
Glass Ionomer ◽  
Luting Cements ◽  
Group 4 ◽  
Tooth Preparation ◽  
Group 2 ◽  
Group 1

Objectives: This study aimed to assess the microleakage of Pedo Jacket crowns compared to stainless steel crowns (SSCs) cemented with different luting cements. Materials and Methods: In this in-vitro experimental study, 80 primary molars were randomly divided into four groups of 20 each. Groups 1 and 2 were subjected to standard tooth preparation for SSC. Crowns in group 1 were cemented with glass ionomer (GI), and crowns in group 2 were cemented with a resin-modified glass ionomer (RMGI) cement. In groups 3 and 4, minimal tooth preparation was performed for Pedo Jacket crowns, and the crowns were cemented with RMGI and Panavia resin cement, respectively. Microleakage was measured at mesial and distal surfaces in micrometers (µm), and the mean value for each tooth was calculated. One-way analysis of variance (ANOVA) was applied to compare the microleakage of the four groups. Results: Group 3 (Pedo Jacket cemented with RMGI) showed the highest microleakage (1523.83±250.32 µm) with significant differences with the remaining three groups (P<0.001). Microleakage in group 4 (Pedo Jacket cemented with Panavia) was significantly lower than that in the other three groups (301.25±219.53 µm, P<0.001). Groups 1 (SSCs cemented with GI) and 2 (SSCs cemented with RMGI) were not significantly different in terms of microleakage (P=0.49) although group 1 showed slightly higher microleakage than group 2 (598.43±260.85 µm versus 500.25±124.74 µm). Conclusions: Pedo Jacket crowns can serve as an acceptable esthetic alternative to SSCs if cemented with resin cements.  

scholarly journals Cyclic fatigue resistance of four different nickel-titanium instruments in an artificial canal

F1000Research ◽  
2021 ◽  
Vol 10 ◽  
pp. 800
Author(s):  
Khoa Van Pham
Keyword(s):  
Stainless Steel ◽  
Cyclic Fatigue ◽  
Nickel Titanium ◽  
Primary System ◽  
Group 4 ◽  
Group 3 ◽  
The Mean ◽  
Group 2 ◽  
Number Of Cycles ◽  
Electronic Microscope

Introduction: The objective of this study was to measure the number of cycles to fracture of four continuous or reciprocating rotary nickel-titanium instruments in different materials. Methods: A total of 40 nickel-titanium instruments were used for the present study. Instruments were divided into four groups (n=10): group 1, Revo-S SU; group 2, ProTaper Next X2; group 3, Reciproc R25; group 4, WaveOne Gold Primary. An artificial stainless-steel was used to test the cyclic fatigue of the instruments. The instruments were introduced into the stainless-steel canal, one at a time, until they reached the other end, then they were rotated inside the canal without in-out motion. The time from the beginning of instrument rotation until the occurrence of breakage was recorded. The number of rotated cycles to fracture of the instrument were calculated based on the revolutions per minute (rpm) of each instrument and the recorded rotated time. The mean number of cycles to fracture and standard deviations were calculated and statistically analysed. Results: The number of cycles to fracture of the Revo-S SU was the lowest, and that of the WaveOne Gold Primary was highest. Scanning electronic microscope images of fracture surfaces revealed the characteristics of fatigue. Conclusions: The number of cycles to fracture of the reciprocating WaveOne Gold Primary system was the highest amongst the tested instruments.

scholarly journals Influence of the ultrasonic activation of irrigating solutions on sealer penetration into lateral root canals

2018 ◽  
Vol 66 (2) ◽  
pp. 117-121 ◽  
Author(s):  
Thalles Henrique Macedo BARBOSA ◽  
Markelane Santana SILVA ◽  
Daylana Pacheco da SILVA ◽  
Antônio Carlos Mendes de MOURA ◽  
Maria Ângela Arêa Leão FERRAZ ◽  
...  
Keyword(s):  
Lateral Root ◽  
Microscopic Analysis ◽  
Negative Control ◽  
Ultrasonic Activation ◽  
Root Canals ◽  
Analysis Group ◽  
Group 4 ◽  
Cement Penetration ◽  
Group 5 ◽  
Group 2

ABSTRACT Objective: This study analyzed the influence of the irrigating solutions ultrasonic activation on the obturator cement penetration into lateral root canals. Methods: Fifty maxillary molars (palatine root) were randomly assigned to 5 experimental groups (Group 1 (EDTA 17% + manual agitation for 5 minutes), Group 2 (EDTA 17% + ultrasonic activation for 15 seconds), Group 3 (NaOCl 1% + Ultrasonic activation for 15 seconds), Group 4 (EDTA 17% + ultrasonic activation for 15 seconds and NaOCl 1% + ultrasonic activation for 15 seconds) and Group 5 (negative control). The lateral root canals were made in the apical and middle third. The obturation occurred in a single session. The radiographic and microscopic analyzes were performed to evaluate the sealant cement penetration degree. Data were analyzed by the Mann-Whitney and Wilcoxon tests. Results: Apical and middle third radiographic analysis showed that Groups 2 and 4 presented better penetration of the sealant cement. In the microscopic analysis, Group 4 presented superior results in relation to the other groups in both thirds. In the apical third, radiographic and microscopic analyzes showed significant differences in the comparisons between Group 4 and Groups 5 (p = 0.019) and 3 (p = 0.023) and between Group 5 and Groups 2 (p = 0.012), 3 (P = 0.038) and 4 (p = 0.019), respectively. Conclusion: It was concluded that the ultrasonic activation of the NaOCl 1% + EDTA 17% irrigation solution provides greater penetration of the endodontic cement in lateral root canals.

scholarly journals Effect of Er,Cr:YSGG Laser Irradiation with Radial Firing Tips onCandida albicansin Experimentally Infected Root Canals

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Leman Ozkan ◽  
Serap Cetiner ◽  
Tamer Sanlidag
Keyword(s):  
Morphological Changes ◽  
Irradiation Effect ◽  
Treatment Protocols ◽  
Root Canals ◽  
Group 4 ◽  
Infected Root ◽  
Significant Difference ◽  
Group 3 ◽  
Group 5 ◽  
Group 2

Aim. To compare the disinfection effect of Er,Cr:YSGG laser using radial firing tips with NaOCI in root canals infected withC. albicansand to evaluate the irradiation effect on the dentinal surfaces.Material and Methods. In total seventy-six mandibular premolar teeth were used. In order to standardize the incubation and sterilization procedure, eight teeth were used. Sixty-eight of the root canals were incubated withC. albicanssuspension for 72 hours. The specimens were divided into 5 experimental groups. Two groups were constituted as Group 1 was irradiated with 1.5 W laser (n=8) and group 2, which was irradiated with 2 W laser (n=8). Two more groups were formed as Group 3 (2 W laser (n=25) and Group 4 NaOCI (5%) (n=25). Group 5 (n=2) did not receive any treatment. Mann-WhitneyUand Kruskal-WallisHtests were used to compare the different laser output powers. Wilcoxon Signed Ranks Test was used in order to compare theCandidacfu/ml levels according to treatment protocols (P<0.05).Results. Both 1.5 W and 2 W laser resulted in a major reduction ofC. albicanswithout a significant difference. The comparison of the dentin surfaces irradiated with Er,Cr:YSGG laser at two power settings resulted in similar morphological changes. However, NaOCI was found to be more effective in reduction ofC. albicansthan 2 W laser application.Conclusion. According to the results of the present study, the Er,Cr:YSGG laser with radial firing tips presented less antifungal effects onC. albicansin root canals of infected teeth than NaOCl solution.

scholarly journals Effect of spreader size on microleakage of roots filled with cold lateral compaction technique

2015 ◽  
Vol 09 (03) ◽  
pp. 378-381
Author(s):  
Tugba Turk ◽  
Beyser Piskin ◽  
Hasan Orucoglu ◽  
Berdan Aydin
Keyword(s):  
Maxillary Incisor ◽  
Human Teeth ◽  
Fluid Filtration ◽  
Root Canals ◽  
Group 4 ◽  
Group 3 ◽  
Group 5 ◽  
Group 2 ◽  
Apical Leakage ◽  
Group 1

ABSTRACT Objectives: To evaluate the effect of spreader size on apical leakage of maxillary incisor teeth. Materials and Methods: A total of 75 permanent human teeth with no carious and no fracture or crack were used for this study. After removing the crown from the cementoenamel junction and the standardization of the root lengths, the specimens were randomly divided into five groups: Group 1 - Roots were not instrumented. Group 2 - Root canals were enlarged using the step-back technique to a #40 file and filled using cold lateral compaction (CLC) of gutta-percha (GP). Group 3 - During the filling procedure, the first spreader used was size 40. Group 4 - The first spreader used was size 35. Group 5 - The initial spreader used was size 25. The amount of leakage through the filled root canals was evaluated by computerized fluid filtration model. Statistical analyzes were done using Kruskal–Wallis test and Mann–Whitney test (P < 0.05). Results: There were statistically significant differences among the groups (P < 0.05). While the uninstrumented group (Group 1) had no leakage, instrumented but not filled roots (Group 2) demonstrated the highest leakage values. There were no differences between Group 3 and 4. Group 5 showed significantly less leakage than Group 3 and 4. Conclusion: Spreader size used during CLC of GP appeared to be a significant factor on apical leakage of roots. Using smaller size spreader during CLC may provide relatively less leakage.

A Comparative Scanning Electron Microscopy Evaluation of Smear Layer Removal from Teeth with Different Irrigation Solutions and Lasers

2013 ◽  
Vol 19 (6) ◽  
pp. 1465-1469 ◽  
Author(s):  
Elif Kalyoncuoğlu ◽  
Ebru Özsezer Demiryürek
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Smear Layer ◽  
Layer Removal ◽  
Root Canals ◽  
Group 4 ◽  
The Difference ◽  
Group 5 ◽  
Group 2 ◽  
Scanning Electron

AbstractThe aim of this study was to evaluate the efficacy of smear layer removal from teeth following root canals using lasers (Er:YAG and Nd:YAG), NaOCl, 17% EDTA, and MTAD by scanning electron microscopy (SEM). Root canals were irrigated with 3 mL of 5.25% NaOCl after each file. Teeth were randomly divided into five groups. In the final irrigation, canals were irrigated with 5.25% NaOCl (Group 1, control), 17% EDTA (Group 2), or BioPure MTAD (Group 3). Laser groups were irradiated with Er:YAG laser (1.8 W, 120 mJ, 15 Hz) (Group 4) or Nd:YAG laser (1 W, 100 mJ, 15 Hz) (Group 5). The smear layer at the apical, middle, and coronal thirds of each root canal was imaged using SEM. Smear layer removal by EDTA was the most effective in all regions. The difference between EDTA and MTAD was statistically significant in the coronal and middle (p < 0.05), but not the apical (p > 0.05), regions. The difference between the control and laser groups was not statistically significant (p > 0.05). In all regions, the difference between 17% EDTA–MTAD and the control–laser groups was statistically significant (p < 0.05). Although improvement was observed in removal of the smear layer using alternative materials and techniques, application of a combination of EDTA and NaOCl remains an effective technique.

scholarly journals Phytochemical evaluation and pharmacological screening of ethanolic and aqueous leaf extracts of Pupalia lappacea for antihyperlipidemic and antihyperglycemic activities in alloxan induced diabetic Albino wistar rats

2018 ◽  
Vol 7 (4) ◽  
pp. 753 ◽  
Author(s):  
Mehnoor Farheen ◽  
Chakrapani Ramesh
Keyword(s):  
Mean Value ◽  
Diabetic Rats ◽  
Control Group ◽  
Free Access ◽  
Leaf Extracts ◽  
Mean Values ◽  
Cholesterol Ratio ◽  
Group 5 ◽  
Group 2 ◽  
Pharmacological Screening

Background: Diabetes is associated with damage to the liver, pancreas and kidney. The damage may vary among patients. This study assessed the hypoglycaemic and antihyperlipidemic activities of leaves ethanolic and aqueous extracts of Pupalia lappaceae in alloxan induced diabetic albino wistar rats.Methods: There were Fifty four rats divided into nine groups containing six rats each. Group 1 consists of normal rats that were given only normal saline and served as a control group. Group 2 consists of normal rats that were given alloxan monohydrate (150mg/kg b.w). Group 3 consists alloxan induced diabetic rats that were given daily sterile solution. glibenclamide+simvastatin (5mg/kg) Group 4 consists of alloxan induced diabetic rats that were given daily sterile solution, AEPL extract (100mg/kg). Group 5 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract AEPL (200mg/kg). Group 6 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract AEPL (400mg/kg) Group 7 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract EEPL (100mg/kg), Group 8 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract EEPL (200mg/kg) Group 9 consists of alloxan induced diabetic rats that were given daily sterile solution, drug extract EEPL (400mg/kg respectively for 21days by an intragastric tube with free access of food and water.Results: Chemical composition of the plant was estimated by GCMS technique several biochemical parameters were assessed. Oral administration of the extract resulted in significant reduction in mean values of blood glucose, triglycerides, total cholesterol, cholesterol ratio, LDL, VLDL, accompanied by increase in the mean value of the HDL in diabetic rats and histopathology of liver, pancreas, and kidney showed significant changes.Conclusions: The effects produced were closely similar to standard antidiabetic and antihyperlipidemic drug. It can thus be concluded that the ethanolic and aqueous extract of Pupalia lappaceae exhibit antihyperlipidemic and antihyperglycemic activities in alloxan induced diabetes in rats.

scholarly journals Calcium Hydroxide improves epoxy sealer adhesion on root dentin

2017 ◽  
Vol 20 (2) ◽  
pp. 108
Author(s):  
Carlos Henrique Ribeiro Camargo ◽  
Bruna Pastro De Lara ◽  
Gleyce Oliveira Silva ◽  
Noala Vicensoto Moreira Milhan ◽  
Simone Helena Ferreira Gonçalves ◽  
...  
Keyword(s):  
Bond Strength ◽  
Calcium Hydroxide ◽  
Human Teeth ◽  
Ultrasonic Agitation ◽  
Root Canals ◽  
Group 4 ◽  
Two Factors ◽  
Root Dentin ◽  
Group 5 ◽  
Group 2

<p><strong>Objective</strong>: The aim of this study is to evaluate the adhesion of an endodontic sealer (AHPlus in root canals after the use of different protocols of 17% EDTA and the use of intracanal medication (ICM) based on calcium hydroxide in aqueous vehicle. <strong>Material and Methods</strong>: For this, 72 single-rooted human teeth were instrumented up to #50 and divided into six groups (n = 12). Group 1: EDTA for 3 min; Group 2: 3 mL of EDTA + 3 min of EDTA; Group 3: 3 mL of EDTA + 3 min of EDTA + 30 seconds of ultrasonic agitation; Group 4: EDTA for 3 min + ICM; Group 5: 3 mL of EDTA + 3 min of EDTA + ICM; Group 6: 3 mL of EDTA + 3 min of EDTA + 30 seconds of ultrasonic agitation + ICM. The root canals were filled with endodontic sealer after each protocol and after 7 days they were prepared to the push-out test. The data were analyzed using ANOVA two factors (p &lt; 0.05). <strong>Results</strong>: It was observed no statistically difference in bond strength in the 3 different 17% EDTA protocols. However, the use of ICM increased significantly the resistance adhesion. <strong>Conclusion</strong>: Intracanal medication based on calcium hydroxide improved the bond strength of AHPlus to dentin walls, regardless of the EDTA protocol.</p><p><strong>Keywords</strong></p><p>Calcium hydroxide; EDTA; Dentin.</p>

scholarly journals Mandibular morphology of the Mongoloid race in Medan according to age groups

2018 ◽  
Vol 51 (2) ◽  
pp. 81
Author(s):  
Maria Sitanggang ◽  
Trelia Boel
Keyword(s):  
Age Groups ◽  
Mean Value ◽  
Group 4 ◽  
Group 3 ◽  
The Mean ◽  
Mandibular Morphology ◽  
Group 5 ◽  
Group 2 ◽  
Ramus Height ◽  
Group 1

Background: The mandible constitutes part of the craniofacial bone that plays an important role in determining an individual’s facial profile. The mandible grows and develops throughout life from the prenatal phase up to old age when it becomes and edentulous. Changes in the mandible can be measured using radiographs. These establish several parameters of mandibular morphology, including: ramus height, condylion height, body length, condylion angle, symphysis height, symphysis width and symphysis angle. Purpose: This study aimed to determine differences in the mandibular morphology of members of the mongoloid racial group in Medan according to age as measured by cephalometric radiography. Methods: This investigation constituted analytical research using cross-sectional study with a total sample of 150 individuals divided according to age: group 1 (aged 4-12 years), group 2 (aged 13-24 years, group 3 (aged 25-34 years), group 4 (aged 35-60 years) and group of 5 (aged > 60 years). The parameters were computerized by means of a digital cephalometric radiograph, the resulting data being analized with Oneway ANOVA and LSD. Results: The mean value of the highest to the lowest ramus height, and symphysis height from the five age groups, sequentially, were in group 3, group 4, group 5, group 2, and group 1. The mean value from the highest to the lowest of body length, condylion height, condylion angle, and symphysis width, sequentially, were in group 3, group 4, group 2, group 5, and group 1. The mean value from the highest to the lowest of symphysis angle, sequentially, were in group 1, group 3, group 4, group 2, and  group 5. Conclusion: The mandibular morphology of each age group differs in Mongoloid races in Medan based on lateral cephalometric radiography in which changes are may be affected by the state of teeth and age.

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