scholarly journals Push-Out Bond Strength of Experimental Apatite Calcium Phosphate Based Coated Gutta-Percha

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Afaf Y. Al-Haddad ◽  
Muralithran G. Kutty ◽  
Zeti Adura Che Ab Aziz
Keyword(s):  
Calcium Phosphate ◽  
Bond Strength ◽  
Failure Mode ◽  
Failure Modes ◽  
Test Machine ◽  
Filling Material ◽  
Cohesive Failure ◽  
Root Canal Filling ◽  
Gutta Percha ◽  
Push Out

Objectives. To evaluate the push-out bond strength of experimental apatite calcium phosphate coated gutta-percha (HAGP) compared to different commercially available coated gutta-percha root obturation points. Methods. Extracted teeth were selected and instrumented using ProTaper rotary files. The canals were assigned into five equal groups and obturated using matching single cone technique as follows: EndoREZ cones and EndoREZ sealer, Bioceramic Endosequence gutta-percha (BCGP) with Endosequence BC sealer, Active GP with Endosequence BC sealer (ActiV GP), conventional GP with Endosequence BC sealer, and HAGP with Endosequence BC sealer. Each root was sectioned transversally at the thickness of 1±0.1 mm to obtain 5 sections (n=25 per group). The specimens were subjected to push-out test using a Universal Test Machine at a loading speed of 0.5 mm/ min. Failure modes after push-out test was examined under stereomicroscope and the push-out data were analyzed using ANOVA and the post hoc Dunnett T3 test (p = 0.05). Results. The highest mean bond strength was yielded by HAGP followed by BCGP, ActiV GP, conventional GP, and EndoREZ. There were significant differences between EndoREZ and all other groups (p<0.001). The prominent failure mode of HAGP was mixed mode, whereas EndoREZ exhibited adhesive failure mode. Conventional GP, ActiV GP, and BCGP showed cohesive failure mode. Conclusion. HAGP showed promising results to be used as root canal filling material in combination with bioceramic sealer.

scholarly journals Physicochemical Properties of Calcium Phosphate Based Coating on Gutta-Percha Root Canal Filling

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Afaf Al-Haddad ◽  
Muralithran G. Kutty ◽  
Noor Hayaty Abu Kasim ◽  
Zeti Adura Che Ab Aziz
Keyword(s):  
Calcium Phosphate ◽  
Root Canal ◽  
Calcium Phosphate Coating ◽  
Filling Material ◽  
Cohesive Failure ◽  
Root Canal Filling ◽  
Gutta Percha ◽  
Sealing Ability ◽  
Coating Method ◽  
Root Dentin

Dental Gutta-percha (GP) is a polymer based standard root canal filling material that has been widely used in dentistry. However, it has an inadequate sealing ability and adhesion to root dentin. The aim of this study is to coat GP with a bioactive material to enhance its sealing ability and adhesion to the root sealer and subsequently to the root dentin. The choice of coating method is limited by the nature of GP as it requires a technique that is not governed by high temperatures or uses organic solvents. In this study, biomimetic coating technique using 1.5 Tas-simulated body fluids (SBF) was employed to coat the treated GP cones. The coated samples were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray Diffraction (XRD), and field emission scanning electron microscope (FESEM). The presence of hydroxyl, carbonate, and phosphate groups was detected by FTIR while the formation of hydroxyapatite (HA)/calcium phosphate was confirmed with XRD. FESEM revealed uniform, thin, and crystalline HA calcium phosphate coating. The adhesion of the coating to the GP substrate was assessed with microscratch technique. It was viable with cohesive failure mode. In conclusion, Tas-SBF is able to coat pretreated GP cones with a crystalline apatitic calcium phosphate layer.

scholarly journals New Methodology to Evaluate Bond Strength of Root-End Filling Materials

2015 ◽  
Vol 26 (3) ◽  
pp. 288-291 ◽  
Author(s):  
Jorge Henrique Stefaneli Marques ◽  
Yara Teresinha Corrêa Silva-Sousa ◽  
Fuad Jacob Abi Rached-Júnior ◽  
Jardel Francisco Mazzi-Chaves ◽  
Carlos Eduardo Saraiva Miranda ◽  
...  
Keyword(s):  
Bond Strength ◽  
Horizontal Plane ◽  
Acrylic Resin ◽  
Specimen Preparation ◽  
Filling Material ◽  
Material Data ◽  
Crosshead Speed ◽  
Filling Materials ◽  
Gutta Percha ◽  
Push Out

This study evaluated the bond strength of root-end filling materials to root-end cavities using a new methodology. Twenty maxillary central incisors were subjected to biomechanical preparation (#80 hand file) and sectioned transversally 2 mm short of the apex and 4 mm coronally to this point. The root cylinders were embedded in acrylic resin and positioned at 45° to the horizontal plane for preparation of root-end cavities with a diamond ultrasonic retrotip. Two groups (n=10) were formed according to the root-end filling material: MTA and Super EBA. A gutta-percha cone (#80) was tug-backed at the limit between the canal and the root-end cavity. The cavity was filled and the gutta-percha cone was removed after complete setting of the sealer. The specimens were placed in an Instron machine with the root-end filling turned downwards. The push-out shaft was inserted in the space previously occupied by the gutta-percha cone and run at a crosshead speed of 1.0 mm/min for pushing out the root-end filling material. Data were analyzed by ANOVA (α=5%). Super EBA (6.03±1.31) presented higher bond strength (MPa) than MTA (1.81±0.45) (p>0.05). There was a predominance of cohesive failures for Super EBA and mixed for MTA. The protocol of specimen preparation is effective and introduces a specific methodology for assessing bond strength of root-end filling materials to dentin. Among the materials, Super EBA presented the highest bond strength.

scholarly journals Chitosan in different concentrations added to a two-step etch-and-rinse adhesive system: influence on bond strength to dentin

2017 ◽  
Vol 20 (4) ◽  
pp. 55
Author(s):  
Rafael Avellar de Carvalho Nunes ◽  
Flávia Lucisano Botelho do Amaral ◽  
Fabiana Mantovani Gomes França ◽  
Cecilia Pedroso Turssi ◽  
Roberta Tarkany Basting
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Failure Modes ◽  
Resin Composite ◽  
Adhesive System ◽  
Fracture Pattern ◽  
Test Machine ◽  
Microtensile Bond Strength ◽  
Etch And Rinse ◽  
Strength Tests

<p class="Corpo"><strong>Objective</strong>: the aim of the present study was to evaluate the influence of adding different concentrations of chitosan to an experimental two-step etch-and-rinse adhesive system on the bond strength and failure mode to dentin. <strong>Material</strong> <strong>and</strong> <strong>Methods</strong>: thirty-two flat dentin surfaces were obtained from extracted human third molars and divided into four groups  (n=8) for application of the adhesive systems: AD - conventional two-step adhesive system (Adper Single Bond 2); EXP – experimental two-step etch-and-rinse adhesive system; Chi0.2% - EXP with addition of 0.2% Chitosan; Chi0.5% - EXP with addition of 0.5% Chitosan. Resin composite build-ups were made and the composite/dentin specimens were sectioned to obtain rectangular beams with a bond area of approximately 1mm<sup>2</sup>. After 24 hours, the sticks were submitted to microtensile bond strength tests in a universal test machine. The fracture pattern was evaluated under a stereoscopic loupe at 40X magnification. <strong>Results</strong>: one-way analysis of variance showed that the type of adhesive system had no significant effect on the bond strength values (p = 0.142), showing the mean bond strength values (standard deviation), in MPa, for the groups as follows: AD=20.1 (5.4); EXP=16.6 (2.3); Chi0.2%=16.1 (2.8); Chi0.5%=16.9 (2.3). In all the groups there was predominance of cohesive fractures in dentin, representing 68 to 82% of the failure modes. <strong>Conclusion</strong>: the addition of 0.2 or 0.5% of chitosan had no influence on the bond strength and failure mode of an experimental two-step etch-and-rinse adhesive system to dentin.</p><p class="Corpo"><strong>Keywords</strong></p><p class="Corpo">Chitosan; Dental Adhesives; Failure Mode; Microtensile Bond Strength.</p>

scholarly journals Do metal alloy primers increase the bond strength of orthodontic tubes?

2019 ◽  
Vol 18 ◽  
pp. e191406
Author(s):  
Keity Cristina Moreira de Oliveira ◽  
Daylana Pacheco da Silva ◽  
Cecília Pedroso Turssi ◽  
Flávia Lucisano Botelho do Amaral ◽  
Vanessa Cavalli
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Analysis Of Variance ◽  
Untreated Control ◽  
Failure Modes ◽  
Adhesive Failure ◽  
Cohesive Failure ◽  
Thermal Cycles ◽  
Exact Test ◽  
Bonded Interface

Aim: To evaluate the bond strength (BS) and failure mode of orthodontic tubes treated with different alloy primers at the interface among enamel, resin and orthodontic tubes. Methods: Orthodontic tubes were bonded to the enamel of 80 bovine incisors with the orthodontic resin (Transbond XT, 3M Unitek). Prior to bonding, the tubes were chemically treated with (n=20) Metal/Zirconia Primer (MZ, Ivoclar), Scothbond Universal (SB, 3M Espe); Orthoprimer (OP, Morelli) or left untreated (Control - C). Specimens were submitted to 5,000 thermal cycles (5 and 55o C) to age the bonded interface. A shear BS test and failure modes were conducted, and the results were analyzed using one-way analysis of variance and Fisher’s exact test, respectively. Results: No differences were observed among groups regardless of the type of alloy primer used (p = 0.254). However, no differences were observed among the failure modes of the groups tested (p=0.694). The adhesive failure mode between the resin and enamel was the most prevalent failure (45%) for groups OP and C, whereas cohesive failure in the orthodontic resin was the most prevalent failure (40%) for groups SB and MZ. Conclusion: Alloy primers were unable to increase the BS of the orthodontic tubes to enamel.

scholarly journals Effect of obturation technique with immediate and delayed post space preparation on apical voids and bond strength of apical gutta-percha

2018 ◽  
Vol 47 (1) ◽  
pp. 470-480 ◽  
Author(s):  
Weilin Long ◽  
Jing Li ◽  
Yiwen Liu ◽  
Hongwei Jiang
Keyword(s):  
Bond Strength ◽  
Failure Modes ◽  
Continuous Wave ◽  
Volumetric Analysis ◽  
Micro Computed Tomography ◽  
Filling Materials ◽  
Gutta Percha ◽  
Percentage Volume ◽  
Post Space ◽  
Push Out

Objective The purpose of this study was to evaluate the effect of immediate and delayed post space preparation on the sealing ability of two root canal obturation techniques by using micro-computed tomography imaging and a push-out test. Methods The root canals of 40 human maxillary premolar teeth were instrumented and divided into four groups: (A) single cone (SC) followed by immediate post space preparation, (B) continuous wave of condensation (CWC) followed by immediate post space preparation, (C) SC followed by delayed post space preparation, and (D) CWC followed by delayed post space preparation. Micro-CT scans were performed for volumetric analysis of voids and filling materials in the apical 4-mm portion. A push-out test was performed, and failure modes (adhesive, cohesive, or mixed) were assessed. Data were analyzed using the Kruskal-Wallis test and one-way analysis of variance. Results No significant differences were observed among the four groups in terms of the percentage volume of voids of the apical 4 mm or the bond strength of apical gutta-percha. Conclusions The percentage volume of voids and bond strength of apical gutta-percha were similar and were not significantly influenced by the timing of post space preparation or the obturation technique.

scholarly journals Influence of Root Canal Filling Techniques on Sealer Penetration and Bond Strength to Dentin

2017 ◽  
Vol 28 (3) ◽  
pp. 380-384 ◽  
Author(s):  
Luciana Martins Domingues de Macedo ◽  
Yara Silva-Sousa ◽  
Silvio Rocha Corrêa da Silva ◽  
Samantha Schaffer Pugsley Baratto ◽  
Flares Baratto-Filho ◽  
...  
Keyword(s):  
Bond Strength ◽  
Root Canal ◽  
Laser Scanning Microscopy ◽  
Filling Material ◽  
Root Canal Filling ◽  
Significant Difference ◽  
Single Cone ◽  
Ah Plus ◽  
The Impact ◽  
Push Out

Abstract The influence of root canal filling techniques on the penetration of AH Plus into dentinal tubules was evaluated using confocal laser scanning microscopy (CLSM) and the impact on the bond strength of the filling material on the root dentin was evaluated using the push-out test. Roots of the maxillary central incisors (n=40) were prepared with ProTaper Universal and assigned to four groups: lateral condensation, vertical compaction, modified Tagger hybrid and single cone. After root canal filling with gutta-percha and AH Plus, along with the addition of 0.01% fluorescein, the roots were cut into 2-mm slices. CLSM was performed on the first slice of each root third, followed by the push-out test. The second slice was analyzed under SEM. ANOVA demonstrated a statistically significant difference between the root canal filling techniques and the root thirds (p<0.05). For percent penetration, Tukey’s test showed that the vertical compaction (91.77±13.51), lateral condensation (89.18±10.91) and modified Tagger hybrid (87.53±15.42) presented the highest values, which significantly differed (p<0.05) from those of the single cone (78.19±22.46). For bond strength (MPa), lateral condensation (3.42±0.54) and vertical compaction (3.47±0.53) had the highest values (p<0.05), while the modified Tagger hybrid (2.19±0.41) and single cone (0.54±0.21) had the lowest. In conclusion, the lateral condensation, vertical compaction and Modified Tagger’s hybrid techniques resulted in greater penetration and bond strength to the intra-radicular dentin.

scholarly journals Effect of Bleaching and Ca(OH)2 Dressing on the Bond Strength of Fiberglass Posts to Root Dentine

2019 ◽  
Vol 13 (03) ◽  
pp. 335-342
Author(s):  
Iane Souza Nery-Silva ◽  
Gabriela Rover ◽  
Maybell Tedesco ◽  
Lucas da Fonseca Roberti Garcia ◽  
Eduardo Antunes Bortoluzzi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Bond Strength ◽  
Failure Modes ◽  
Root Canal Filling ◽  
Multiple Comparison Test ◽  
Significant Difference ◽  
Frequent Failure ◽  
Push Out ◽  
Scanning Electron

Abstract Objective The purpose of this study was to evaluate the effect of the intracoronary bleaching and calcium hydroxide (Ca(OH)2) dressing use, on the bond strength (BS) of fiberglass posts to root dentine. Materials and Methods After root canal filling of 40 bovine incisors, a 2-mm thick cervical plug was fabricated 2 mm below the cementum–enamel junction. Seven days later, teeth were randomly distributed into four groups (n = 10), as follows: G1 no bleaching, followed by immediate post cementation; G2 bleaching and immediate post cementation; G3 bleaching, dressing with Ca(OH)2 for 7 days, and post cementation; and G4 bleaching, no dressing, and post cementation after 7 days. The roots were transversally cut into 1-mm thick slices to perform the push-out test (0.5 mm/min). Failure modes were assessed under scanning electron microscopy. Statistical Analysis The analysis of variance (two-way ANOVA) was performed, followed by the supplementary Tukey multiple comparison test (a = 5%). Results No significant difference for BS was observed among groups. Considering the different root thirds, G1 had higher BS values for the cervical third in comparison with the apical one (p < 0.05). The most frequent failure modes were adhesive between cement/dentine (G1); cohesive at the post (G2 and G3), and mixed (G4). Conclusions The BS of the fiberglass posts to root dentine was not affected by the intracoronary bleaching and the use of Ca(OH)2 dressing.

scholarly journals Effect of Blood Contamination on The Push-Out Bond Strength of Calcium Silicate Cements

2018 ◽  
Vol 29 (2) ◽  
pp. 189-194 ◽  
Author(s):  
Flavia Kolling Marquezan ◽  
Patricia Maria Poli Kopper ◽  
Angela Isabel dos Santos Dullius ◽  
Diego Machado Ardenghi ◽  
Renata Grazziotin-Soares
Keyword(s):  
Bond Strength ◽  
Calcium Silicate ◽  
Failure Modes ◽  
Cohesive Failure ◽  
Blood Contamination ◽  
Whitney Test ◽  
Calcium Silicate Cements ◽  
Root Dentin ◽  
Push Out ◽  
Over Time

Abstract This study investigated the effect of blood-contamination on the push-out bond strength of BiodentineTM (BD) and MTA Angelus® (MTA-A) to root dentin over time. Twenty-five teeth were sectioned horizontally to obtain 120 root slices. The lumens were filled with MTA-A or BD: 60 for each cement (30 uncontaminated and 30 blood contaminated). Push out bond strength to dentin was assessed at 24 h (n=10), 7 days (n=10) and 28 days (n=10). Failure modes were classified as: cohesive, adhesive or mixed failure. Two-way ANOVA was used to investigate the interaction between blood contamination vs. hydration period. Mann Whitney test compared different materials in each period, and it also compared the contaminated versus uncontaminated material for each period. Friedman, followed by Dunn`s test, compared periods of hydration for each material, regardless of blood contamination. Failure modes were reported descriptively. The interaction hydration period vs. blood contamination was highly significant for MTA-A (P=0.001) and it was not significant for BD (P=0.474). There were no differences between bond strength of uncontaminated and contaminated BD in any of the periods. Bond strength of uncontaminated MTA-A increased at each time of hydration; but it remained stable over time for blood-contaminated samples. BD had higher bond strength than MTA-A in all periods of hydration. Cohesive failure predominated. Only for MTA-A, the over time bond strength to dentin was affected by blood contamination.

scholarly journals Effect of different final irrigation solutions on push-out bond strength of root canal filling material

2020 ◽  
Vol 53 (4) ◽  
pp. 181
Author(s):  
R. Rahmatillah ◽  
Isyana Erlita ◽  
Buyung Maglenda
Keyword(s):  
Bond Strength ◽  
Root Canal ◽  
Smear Layer ◽  
Filling Material ◽  
Bonding Mechanism ◽  
Root Canal Filling ◽  
Significant Difference ◽  
Irrigation Solution ◽  
Bonferroni Test ◽  
Push Out

Background: The adhesion of root canal filling material to dentin is one of the crucial factors in determining the success of endodontic treatment. However, the smear layer that forms during instrumentation serves as an interface that impedes the bonding mechanism of the filling material. A proper irrigation solution is required to remove the smear layer and provide a dentin surface that supports the bonding mechanism of the filling material in establishing good adhesion. Purpose: This study aims to evaluate and compare the bond strength of filling material with different final irrigation solutions. Methods: Mandibular premolars were prepared by a crown down, pressure-less technique and divided into three final irrigation groups (2.5% NaOCl, 17% EDTA and 20% citric acid). The root canal of each tooth was obturated using epoxy sealer and gutta-percha. A two-millimetre-thick section of the apical third portion of each group was arranged for the push-out assessment using a universal testing machine in an apical to coronal direction at 1 mm/min crosshead speed. Results: A one-way ANOVA test indicated the difference in push-out bond strength among the groups (p<0.05). A post hoc Bonferroni test presented a statistically significant difference in the bond-strength value between the 2.5% NaOCl group compared with the 20% CA group (p<0.05). Conclusion: The push-out bond strength of root canal filling material is increased by applying a chelating agent as the final irrigation solution where 20% of CA presents the highest push-out bond strength.

scholarly journals Effect of Irrigants on the Push-Out Bond Strength of Two Bioceramic Root Repair Materials

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1921 ◽  
Author(s):  
Ruaa A. Alamoudi ◽  
Sawsan T. Abu Zeid
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Sodium Hypochlorite ◽  
Surface Structures ◽  
Infrared Analysis ◽  
Adhesive Failure ◽  
Cohesive Failure ◽  
Root Repair ◽  
Repair Materials ◽  
Push Out

The purpose of this study was to compare different irrigants’ effect on two EndoSequence root repair materials’ push-out bond strength. Sixty root slices were filled either with EndoSequence premixed fast-set putty or regular-set paste, and then immersed either in sodium hypochlorite, chlorhexidine gluconate, or saline (as control) for 30 min, after which the slices were subjected to the push-out test. The surface structures were evaluated with Scanning Electron Microscopy and Fourier Transform Infrared. Fast-set putty exhibited greater displacement resistance when immersed in saline and subjected to adhesive failure mode, while regular-set paste showed greater resistance when immersed in chlorhexidine and subjected to cohesive failure mode. Infrared analysis showed changes in organic filler, and carbonate and phosphate bands after using irrigants. The lowest carbonate/phosphate ratio was found for chlorhexidine in both materials. Therefore, sodium hypochlorite reduced EndoSequence root repair materials’ displacement resistance markedly.

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