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

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.

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

Brazilian Dental Journal ◽

10.1590/0103-6440201300189 ◽

2015 ◽

Vol 26 (3) ◽

pp. 288-291 ◽

Cited By ~ 12

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.

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Effect of post-space treatments on the push-out bond strength and failure modes of glass fibre posts

Australian Endodontic Journal ◽

10.1111/j.1747-4477.2010.00275.x ◽

2010 ◽

Vol 39 (1) ◽

pp. 19-24 ◽

Cited By ~ 9

Author(s):

Hacer Deniz Arısu ◽

Bağdagül Helvacıoğlu Kıvanç ◽

Baran C. Sağlam ◽

Eser Şimşek ◽

Güliz Görgül

Keyword(s):

Bond Strength ◽

Glass Fibre ◽

Failure Modes ◽

Post Space ◽

Glass Fibre Posts ◽

Push Out

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

International Journal of Biomaterials ◽

10.1155/2018/1731857 ◽

2018 ◽

Vol 2018 ◽

pp. 1-5 ◽

Cited By ~ 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.

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Can Type of Instrumentation and Activation of the Final Irrigant Improve the Obturation Quality in Oval Root Canals? A Push-Out Bond Strength Study

Biology ◽

10.3390/biology11010059 ◽

2022 ◽

Vol 11 (1) ◽

pp. 59

Author(s):

Ajinkya M. Pawar ◽

Anda Kfir ◽

Zvi Metzger ◽

Anuj Bhardwaj ◽

Yeyen Yohana ◽

...

Keyword(s):

Bond Strength ◽

File Systems ◽

Adhesive Failure ◽

Passive Ultrasonic Irrigation ◽

Root Canals ◽

Filling Materials ◽

Gutta Percha ◽

Ah Plus ◽

Ultrasonic Irrigation ◽

Push Out

To appraise the outcome of file systems and activation of the final irrigant on the push-out bond strength of root fillings in oval canals. Single-rooted mandibular premolars (n = 180) with oval canals were divided into three groups (n = 60) for instrumentation: ProTaper Next (PTN), WaveOne (WO), and Self-adjusting File (SAF). The specimens were further divided into subgroups (n = 20) and subjected to final irrigation with activation by EndoActivator or passive ultrasonic irrigation or without activation. Then, the specimens were again subdivided (n = 10) and obturated with gutta-percha and AH Plus (GP-AH) or C-Point with EndoSequence bioceramic sealer (C-EBC). One-millimeter-thick horizontal slices were cut from the apical third of the root, 5 mm from the apex, and subjected to push-out bond strength (BS) testing. Specimens for which SAF was used exhibited higher BS values than those for which PTN or WO was used (p < 0.05). Activation of the final irrigation did not affect the BS of the root fillings. Root fillings made of C-EBC presented a higher BS than those made of GP-AH (p < 0.05). Adhesive failure was more common with specimens instrumented using PTN and WO. Root canals instrumented with SAF, showed the highest bond strength values for both root filling materials. The C-EBC produced significantly higher bond strength values than those of the GP-AH.

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Presence of voids after three obturation techniques in band‐shaped isthmuses: a micro‐computed tomography study

BMC Oral Health ◽

10.1186/s12903-021-01584-2 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Pengfei Zhang ◽

Keyong Yuan ◽

Qiaoqiao Jin ◽

Fen Zhao ◽

Zhengwei Huang

Keyword(s):

Computed Tomography ◽

Continuous Wave ◽

Ct Scanning ◽

Micro Ct ◽

Micro Computed Tomography ◽

Filling Materials ◽

Gutta Percha ◽

Molar Teeth ◽

Void Volumes

Abstract Background The objective of the present micro-computed tomography (micro-CT) study was to assess the presence of voids in band-shaped isthmuses obturated using three different filling techniques. Methods Twenty-four artificial molar teeth with a band-shaped isthmus were allocated to three groups (n = 8) for obturation, according to the filling technique: single-cone (SC), continuous wave of condensation (CWC) or lateral condensation (LC). Obturation was performed with gutta-percha (GP) cones and iRoot SP (Innovative Bioceramix, Vancouver, Canada). Post-filling micro-CT scanning was performed. The percentage of filling materials and void volumes were calculated in the isthmus areas and data were analyzed using one-way ANOVA and Tukey tests. Results The mean percentage of void volumes and corresponding filling percentages in the isthmus areas after obturation in the SC groups was 22.98 % ± 1.19 %, 77.02 % ± 1.19 %; in the CWC groups 10.46 % ± 2.28 %, 89.54 % ± 2.28 %; and in the LC groups was 13.14 % ± 1.85 %, 86.86 % ± 1.85 %, respectively. Conclusions In band-shaped isthmus area, the obturation quality of CWC was superior to SC and LC techniques.

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Push-out bond strength of two root-end filling materials in root-end cavities prepared by Er,Cr:YSGG laser or ultrasonic technique

Australian Endodontic Journal ◽

10.1111/j.1747-4477.2010.00264.x ◽

2010 ◽

Vol 38 (3) ◽

pp. 113-117 ◽

Cited By ~ 5

Author(s):

Noushin Shokouhinejad ◽

Hasan Razmi ◽

Reza Fekrazad ◽

Saeed Asgary ◽

Ammar Neshati ◽

...

Keyword(s):

Bond Strength ◽

Ultrasonic Technique ◽

Filling Materials ◽

Push Out

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Influence of the Resin Cement Thickness on the Push-Out Bond Strength of Glass Fiber Posts

Brazilian Dental Journal ◽

10.1590/0103-6440201600886 ◽

2016 ◽

Vol 27 (5) ◽

pp. 592-598 ◽

Cited By ~ 7

Author(s):

Regina Maria Helen-Cot Marcos ◽

◽

Gustavo Ross Kinder ◽

Edson Alfredo ◽

Tarcisio Quaranta ◽

...

Keyword(s):

Bond Strength ◽

Glass Fiber ◽

Resin Composite ◽

Resin Cement ◽

Distilled Water ◽

Cement Layer ◽

Fiber Posts ◽

Glass Fiber Posts ◽

Post Space ◽

Push Out

Abstract The objective of the present study was to evaluate the influence of resin cement thickness on the bond strength of prefabricated and customized glass fiber posts after storage in distilled water. Thirty human uniradicular roots were treated endodontically. The roots were divided into 3 groups: THIN (thin cement layer) - post space preparation with #0.5 drill and cementation of #0.5 post; THICK (thick cement layer) - post space preparation with #1 drill and cementation of #0.5 post; and CUSTOM (customized cement layer) - post space preparation with #1 drill and cementation of a customized post (#0.5 glass fiber posts customized with resin composite). All posts were luted with self-adhesive resin cement. The push-out test was carried out after storage for 24 h and 90 days in distilled water at 37 °C. The data were analyzed with three-way ANOVA and Tukey's test (a=0.05). Bond strengths were significantly higher for CUSTOM (9.37 MPa), than for THIN (7.85 MPa) and THICK (7.07 MPa), which were statistically similar. Considering the thirds, the bond strength varied in the sequence: apical (7.13 MPa) < middle (8.22 MPa) = coronal (8.94 MPa). Bond strength for 24 h storage was significantly higher (8.80 MPa) than for 90-day storage (7.40 MPa). It may be concluded that the thickness of resin cement influenced the bond strength of glass fiber posts. The customized posts presented higher bond strength. Storage in water for 90 days affected negatively the values of bond strength, especially for thick cement layers in the apical third.

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Effect of Glass Fiber Post Adaptation on Push-Out Bond Strength to Root Dentin

Brazilian Dental Journal ◽

10.1590/0103-6440201902491 ◽

2019 ◽

Vol 30 (4) ◽

pp. 350-355 ◽

Cited By ~ 1

Author(s):

Thiago Lopes de Freitas ◽

Rafael Pino Vitti ◽

Milton Edson Miranda ◽

William Cunha Brandt

Keyword(s):

Bond Strength ◽

Glass Fiber ◽

Root Canal ◽

Failure Modes ◽

Resin Cement ◽

Adhesive Failure ◽

Fiber Post ◽

Significant Difference ◽

Glass Fiber Post ◽

Push Out

Abstract The aim of this study was to evaluate the effect of different glass fiber posts (GFPs) diameters on the push-out bond strength to dentin. Forty unirradicular human teeth were endodontically treated and used for cementation of GFPs (White Post DC, FGM) with different diameters (n=10): P1 - ø 1.6 mm coronal x 0.85 mm apical; P2 - ø 1.8 mm coronal x 1.05 mm apical; P5 - ø 1.4 mm coronal x 0.65 mm apical; and PC - customized post number 0.5 with composite resin (Tetric Ceram A2, Ivoclair Vivadent). All GFPs were cemented into the root canal using a dual-curing luting composite (Variolink II, Ivoclar Vivadent). One slice (1.7 mm) of each root third of cemented GFP (cervical, middle, and apical) was submitted to push-out testing. Failure modes of all specimens were classified as: adhesive failure between resin cement and post; adhesive failure between dentin and resin cement; cohesive failure within resin cement, post or dentin; and mixed failure. The data were analyzed with two-way ANOVA and Tukey’s test (a=0.05). The highest bond strength values were presented for the P2 and PC groups. There was no statistically significant difference between the GFP thirds in each group. The groups P2, P5, and PC showed predominantly adhesive failure. For P1, the most prevalent type of failure was adhesive between resin cement and post. It may be concluded that a glass fiber post that is well adapted to the root canal presents higher bond strength values, regardless of GFP third.

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Push-out Bond Strength of Root-end Filling Materials

Brazilian Dental Journal ◽

10.1590/0103-6440201600340 ◽

2016 ◽

Vol 27 (3) ◽

pp. 332-335 ◽

Cited By ~ 6

Author(s):

Rodrigo Ricci Vivan ◽

Juliane Maria Guerreiro-Tanomaru ◽

Roberta Bosso-Martelo ◽

Bernardo Cesar Costa ◽

Marco Antonio Hungaro Duarte ◽

...

Keyword(s):

Zinc Oxide ◽

Bond Strength ◽

Mechanical Test ◽

Test Machine ◽

Adhesive Failure ◽

Root Canal Preparation ◽

Significance Level ◽

Tukey Test ◽

Filling Materials ◽

Push Out

Abstract The aim of this study was to evaluate the bond strength of root-end filling materials. Forty 2-mm-thick slices were obtained from human single-rooted teeth. After root canal preparation using a 1.5 mm diameter cylindrical drill, the dentinal walls were prepared by diamond ultrasonic tip (CVD T0F-2). The specimens were divided according the material (n=10): MTA Angelus (MTAA), MTA Sealer (MTAS, experimental), Sealer 26 (S26) and zinc oxide and eugenol cement (ZOE). The push-out test was performed in a mechanical test machine (EMIC DL 2000) at 1 mm/min speed. The failure type was evaluated by stereomicroscopy. The results were subjected to ANOVA and Tukey test, at 5% significance level. MTAA (19.18 MPa), MTAS (19.13 MPa) and S26 (15.91 MPa) showed higher bond strength (p<0.05). ZOE (9.50 MPa) showed the least bond strength values (p<0.05). Adhesive failure was prevalent in all groups, except for ZOE, which showed mixed failures. It was concluded that root-end filling materials MTA Angelus, MTA Sealer and Sealer 26 showed higher bond strength to dentinal walls than zinc oxide and eugenol cement after retrograde preparation.

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