scholarly journals Does the Moment of Fiber Post Cutting Influence on the Retention to Root Dentin?

2015 ◽  
Vol 26 (2) ◽  
pp. 141-145 ◽  
Author(s):  
Marcela G. Borges ◽  
André L. Faria-e-Silva ◽  
Paulo C. F. Santos-Filho ◽  
Fernanda P. Silva ◽  
Luís R. M. Martins ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Testing Machine ◽  
Resin Cement ◽  
Fiber Post ◽  
Root Canals ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
The Moment ◽  
Post Hoc

Despite several advantages associated with pre-fabricated glass-fiber posts, the coronal portion of these posts must be cut to allow their use in various clinical situations. However, cutting the cemented post can generate stress on the bonding interface and affect the bond strength. The aim of this study was to investigate the effect the of fiber post cutting on the bond strength of root canals. Sixty bovine incisor roots were included in resin cylinders with simulated periodontal ligaments. Glass-fiber posts were luted using regular resin cement RelyX ARC (3M ESPE) or self-adhesive cement RelyX Unicem (3M ESPE). The posts were cut prior to cementation, immediately after luting or after building up the core (n=10). After storage for 24 h, the samples were cut and subject to push-out testing using a mechanical testing machine (EMIC DL 2000). Data were analyzed using two-way ANOVA (resin cement x moment of post cutting) and Tukey's post hoc test (α=0.05). The moment of fiber post cutting did not affect the bond strength when Unicem was used. However, the bond strength was reduced when ARC was used and when the post was cut immediately. In conclusion, the moment of fiber post cutting may affect the retention of root canal posts when a regular resin cement is used.

CAD/CAM Milled Glass Fiber Posts: Adaptation and Mechanical Behavior in Flared Root Canals

2021 ◽  
Author(s):  
MER Gama ◽  
GS Balbinot ◽  
GC Ferreira ◽  
EG Mota ◽  
VCB Leitune ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Fiber Post ◽  
Root Canals ◽  
Fiber Posts ◽  
Cad Cam ◽  
Glass Fiber Posts ◽  
Glass Fiber Post ◽  
Post And Core ◽  
Push Out

SUMMARY This study aimed to evaluate the cementation and mechanical behavior of flared root canals restored with CAD/CAM milled glass fiber post-and-core systems. Sixty-six endodontically treated human canines with a flared root canal were divided into three different groups according to the type of post: GPF received prefabricated posts; GREL received relined glass fiber posts, and GMILLED received CAD/CAM milled glass fiber posts. Cementation was performed with self-adhesive resin cement. The samples were submitted to x-ray microcomputed tomography analysis for the analysis of voids and gaps. The roots were sectioned and submitted to the push-out bond strength test. The load-to-fracture was evaluated in post-and-core systems. GMILLED presented lower void and lower gap volumes when compared to GPF and GREL. On the load-to-fracture test, GREL presented statistically significant higher values than GMILLED. GPF values had no statistically significant difference from the two other groups. On the push-out bond strength test, GPF presented statistically significant lower values when compared to GREL and GMILLED. The most common failure pattern was between dentin and cement in all groups. CAD/CAM milled glass fiber post-and-core systems presented an enhanced adaptation of glass fiber posts to flared root canal systems. Their results were comparable to relined posts in bond strength, while load-to-fracture-results for GMILLED were lower than those for GPF.

scholarly journals Push-out Bond Strength of Glass Fiber Posts Cemented in Weakened Roots with Different Luting Agents

2016 ◽  
Vol 17 (2) ◽  
pp. 119-124 ◽  
Author(s):  
Lourenço Correr-Sobrinho ◽  
Daniele M da Silveira-Pedrosa ◽  
Luis RM Martins ◽  
Mário AC Sinhoreti ◽  
Manoel D Sousa-Neto ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Failure Modes ◽  
Resin Cement ◽  
Root Canals ◽  
Luting Agents ◽  
Fiber Posts ◽  
Luting Agent ◽  
Glass Fiber Posts ◽  
Push Out

ABSTRACT Aim To evaluate the push-out bond strength (BS) of direct anatomic posts (DAPs) and conventional fiber posts (CFPs) cemented with different luting agents in different thirds of flared root canals. Materials and methods A total of 60 human single-rooted canine teeth were transversally sectioned 16 mm from the radicular apex. After endodontic treatment, canals were flared with diamond burs. Samples were divided into six groups according to post type and luting agent: DAP and RelyX U100 (RXU); DAP and RelyX ARC (RXA); DAP and RelyX Luting 2 (RXL); CFP and RXU; CFP and RXA; CFP and RXL. Roots were sectioned transversely into six 1-mm-thick slices. The push-out test was performed and failure modes were observed. Results The DAP groups (7.23 ± 2.05) showed highest BS values (p < 0.05) when compared with CFP (5.93 ± 1.76). RelyX U100 (8.17 ± 1.70) showed higher BS values (p < 0.05) than RXA (6.46 ± 1.38), and RXL (5.10 ± 1.65) showed the lowest values. Bond strength on the apical third was statistically lower (p < 0.05) than that on the other thirds of the root canals. There was a predominance of adhesive failure for all groups. Conclusion The DAPs improved retention in flared root canals, and RXU was the most effective luting agent. The apical third showed the lowest BS values. Clinical significance The relining procedure of fiber posts with composite and the proper selection of luting resin cement are important for increasing bonding effectiveness in flared root canals. How to cite this article da Silveira-Pedrosa DM, Martins LRM, Sinhoreti MAC, Correr-Sobrinho L, Sousa-Neto MD, Costa ED Jr, de F Pedrosa-Filho C, de Carvalho JR Jr. Push-out Bond Strength of Glass Fiber Posts Cemented in Weakened Roots with Different Luting Agents. J Contemp Dent Pract 2016;17(2): 119-124.

scholarly journals Influence of Er,Cr:YSGG Laser Irradiation on the Push-Out Bond Strength of Zirconia and Glass Fiber Posts with Radicular Dentin

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Raneem S. Alofi ◽  
Ibraheem F. Alshiddi ◽  
Yasser F. AlFawaz ◽  
Abdulaziz Alsahhaf ◽  
Khulud Abdulrahman Al-Aali ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Testing Machine ◽  
Resin Cement ◽  
Cervical Region ◽  
Fiber Posts ◽  
Significant Difference ◽  
Glass Fiber Posts ◽  
Push Out

Objective. This in vitro study was designed to evaluate the influence of an Er,Cr:YSGG laser on the bond strength of zirconia and glass fiber posts with root dentin. Materials and methods. Ninety extracted single-rooted human teeth were randomized into 6 groups (n = 15/group) on the basis of different posts (zirconia/glass fiber) and Er,Cr:YSGG laser tips (axial and radial). Specimens were prepared for push-out testing with the help of a cutting machine; six slices (2 on each cervical, middle, and apical) of approximately 1 mm thickness were sectioned for all roots on a plane perpendicular to the long axis of the post. All specimens were placed into a universal testing machine with a defined 0.5 mm/min crosshead speed until the maximum failure load was obtained. Results. The highest mean push-out bond strength of the glass fiber and zirconia groups was achieved with laser treatment. The highest push-out bond strength was achieved with the axial fiber tip (7.63 ± 1.22 MPa), and the lowest was achieved with a radial fiber tip of the glass fiber group (6.98 ± 0.96 MPa). ANOVA showed a statistically significant difference between the groups (p=0.041). The mean push-out bond strength was found to be higher with an axial fiber tip for both cervical and apical segments in the glass fiber and zirconia groups (p<0.05). The independent t-test resulted in the overall highest mean push-out bond strength in the apical segments (p=0.026). Conclusion. Within the limits of the present in vitro research study, an enhancement in the push-out bond strength of resin cement, mainly in the cervical region of the root canal, was achieved after irradiation with an Er,Cr:YSGG laser using an axial fiber tip.

scholarly journals Effect of Anatomical Customization of the Fiber Post on the Bond Strength of a Self-Adhesive Resin Cement

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Adricyla Teixeira Rocha ◽  
Leticia Machado Gonçalves ◽  
Ana Júlia de Carvalho Vasconcelos ◽  
Etevaldo Matos Maia Filho ◽  
Ceci Nunes Carvalho ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Resin Cement ◽  
Control Group ◽  
Fiber Post ◽  
Adhesive Resin ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
Adhesive Resin Cement ◽  
Push Out

Aim. The aim of the study was to evaluate, by means of the push-out test, the effect of the anatomical customization of the fiber post on the bond strength of a self-adhesive resin cement. Methods. Twelve endodontically treated, human, upper central incisors were randomly divided into two groups (n=6): control (glass fiber posts cemented with Relyx® U200) and customized (glass fiber posts anatomically customized with translucent composite resin cemented with Relyx U200). The roots were sectioned into three slices, cervical, middle, and apical, and photographed with a digital camera attached to a stereomicroscopic loupe. The images were analyzed by software, for evaluation of the cement line. The slices were subsequently submitted to the push-out test until the post had completely extruded, and the fracture mode was analyzed with a stereomicroscopic loupe. Results. The results showed significant differences between the groups in the different root thirds in relation to the area occupied by air bubbles (p<0.05). Bond strength, when all the thirds are considered, was 8.77 ± 4.89 MPa for the control group and 16.96 ± 4.85 MPa for the customized group. Conclusion. The customized group showed greater bond resistance than the control group and a more uniform cement layer.

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

2016 ◽  
Vol 27 (5) ◽  
pp. 592-598 ◽  
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.

scholarly journals Stress Generated by Customized Glass Fiber Posts and Other Types by Photoelastic Analysis

2015 ◽  
Vol 26 (3) ◽  
pp. 222-227 ◽  
Author(s):  
Kátia Bosso ◽  
Alcides Gonini Júnior ◽  
Ricardo Danil Guiraldo ◽  
Sandrine Bittencourt Berger ◽  
Murilo Baena Lopes
Keyword(s):  
Glass Fiber ◽  
High Stress ◽  
Resin Cement ◽  
Fiber Post ◽  
Tooth Structure ◽  
Biomechanical Behavior ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
Glass Fiber Post ◽  
Post And Core

Endodontic posts are necessary to provide adequate retention and support when no sufficient remaining structure is available to retain the core. There are different materials and techniques to construct post-and-core, but there is no consensus about which one promotes better stress distribution on the remaining tooth structure. This study aimed to quantify and evaluate the distribution of stress in the root produced by customized glass fiber posts compared to different endodontic posts. Twenty-five simulated roots from photoelastic resin were made and divided into 5 groups: CPC, cast post-and-core; SP, screw post; CF, carbon fiber post; GF, glass fiber post; and CGF, customized glass fiber post. After cementing CPC and SP posts with zinc phosphate cement, and CF, GF and CGF posts with resin cement, resin cores were made for groups 2-5. Specimens were evaluated with vertical or 45° oblique loading. To analyze the fringes, the root was divided into 6 parts: palatal cervical, palatal middle, palatal apical, vestibular cervical, vestibular middle, and vestibular apical. The formed fringes were photographed and quantified. Data were recorded and subjected to two-way ANOVA and Tukey's test (5%). SP (1.95±0.60) showed higher stress (p<0.05) compared to the others (CPC-0.52±0.74; CF-0.50±0.75, GF-0.23±0.48 and CGF-0.45±0.83). All posts showed high stress in apical third (CPC-1.40±0.65; SP-2.30±0.44, CF-1.80±0.45, GF-1.20±0.45, CGF-1.70±1.03) Low stress was found in cervical third (CPC-0.20±0.45; CF-0.00±0.00, GF-0.00±0.00, CGF-0.00±0.00), except by SP (1.90±0.65), which showed statistical difference (p<0.05). Customized post showed high stress concentration at the root and conventional glass fiber posts showed more favorable biomechanical behavior.

scholarly journals Influence of the Cement Film Thickness on the Push-Out Bond Strength of Glass Fiber Posts Cemented in Human Root Canals

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Natália Araújo Silva Prado ◽  
Reinaldo de Souza Ferreira ◽  
Marcos Henrique de Pinho Maurício ◽  
Sidnei Paciornik ◽  
Mauro Sayão de Miranda
Keyword(s):  
Bond Strength ◽  
Film Thickness ◽  
Glass Fiber ◽  
Shear Bond Strength ◽  
Root Canals ◽  
Fiber Posts ◽  
Before And After ◽  
Glass Fiber Posts ◽  
Adhesive Cement ◽  
Push Out

The present study evaluated the influence of the cement film thickness on the push-out bond strength of glass fiber posts in the cervical, medium, and apical thirds of root canal spaces. Thirty roots were randomly divided into three groups, according to the fiber post system’s drills: (G1) #2; (G2) #3; (G3) #4. The posts were cemented using a self-adhesive cement, and a small amount of powdered Rhodamine B was used as a stain. Images of both sides of each slice were obtained before and after the push-out test. To determine the cement thickness, a macro routine was developed using the software KS 400. The data were analyzed statistically using Kruskal-Wallis and Dunn’s test. G2 (14.62±5.15 MPa) showed statistically higher bond strength values than G1 (10.04±5.13 MPa) and G3 (7.68±6.14 MPa). All groups presented higher bond strength values in the apical third. The bur diameter significantly influenced the results of the shear bond strength for the push-out test. The slight increase in the cement thickness allowed an increase in the values of shear bond strength when compared to very thin or very thick cement films.

scholarly journals Fracture Resistance of Simulated Immature Teeth after Different Intra-radicular Treatments

2015 ◽  
Vol 26 (3) ◽  
pp. 211-215 ◽  
Author(s):  
Gustavo Sivieri-Araujo ◽  
Mario Tanomaru-Filho ◽  
Juliane Maria Guerreiro-Tanomaru ◽  
Eduardo Antunes Bortoluzzi ◽  
Érica Gouveia Jorge ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fracture Strength ◽  
Root Canal ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Fiber Post ◽  
Immature Teeth ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
Glass Fiber Post

The aim of this study was to evaluate the fracture resistance of simulated immature teeth after different intra-radicular treatments. Crowns and roots of bovine incisors were cut transversally and removed to simulate immature teeth. Root canal preparation and flaring were performed using a bur in crown-apex and apex-crown direction. The samples were distributed into 5 groups (n=10): Positive control (PoC) - no root canal flaring or filling; Negative control (NeC) - teeth were sectioned and their root canals were flared; Direct anatomical glass fiber post (RaP) - #2 Reforpost main glass fiber post relined with composite resin; Double tapered conical glass fiber posts (ExP) - #3 Exacto glass fiber post; and #2 Reforpost main glass fiber + Reforpin accessory glass fiber posts (RrP). In RaP, ExP and RrP, 4.0-mm apical plugs were done with MTA Angelus. The specimens were embedded in polystyrene resin inside cylinders and the periodontal ligament was simulated with a polyether-based impression material. The specimens were submitted to compressive fracture strength test (0.5 mm/min at 135° relative to the long axis of the tooth) in a servo-hydraulic mechanical testing machine MTS 810. Data were subjected to one-way ANOVA and Dunnett's C or Tukey's tests (α=0.05). The control groups (PoC and NeC) showed lower fracture strength than the experimental groups. NeC presented the lowest resistance and ExP presented the highest resistance among the experimental groups. The flaring procedures produced a detrimental effect on the fracture resistance of the bovine teeth. Glass fiber intra-radicular posts increased significantly the fracture resistance of simulated immature teeth.

scholarly journals Effect of Intracanal Medicaments on Pull-Out Bond Strength of Fiber Post Cemented with a Self-Adhesive System

2019 ◽  
Vol 13 (03) ◽  
pp. 420-425
Author(s):  
Pegah Sarraf ◽  
Atoosa Assadi ◽  
Nazanin Kiomarsi ◽  
Fatemeh Mohammadian ◽  
Arsalan Assadi ◽  
...  
Keyword(s):  
Bond Strength ◽  
Adhesive System ◽  
Analysis Data ◽  
Control Group ◽  
Fiber Post ◽  
Root Canals ◽  
Pull Out ◽  
Fiber Posts ◽  
Significant Difference ◽  
Glass Fiber Posts

Abstract Objectives This study aimed to assess the effect of four intracanal medicaments on pull-out bond strength of fiber posts. Materials and Methods A total of 65 single-rooted, single-canal teeth were selected and decoronated. Root canals were prepared and after rinsing were randomly divided into five groups (n = 13). G1: calcium hydroxide (CH), G2: CH plus chlorhexidine (CH+CHX), G3: triple antibiotic paste (TAP), G4: double antibiotic paste (DAP) were applied in the canals in the four groups. The control group (G5) received no medicament. After 4 weeks, the medicaments were rinsed off and the canals were filled with gutta-percha. Post space was then prepared in root canals for the placement of glass fiber posts and self-adhesive cement (Panavia F2). After cementation, they were subjected to pull-out bond strength test. Statistical Analysis Data were statistically analyzed using one-way analysis of variance and Tukey test.Results The pull-out bond strength values were significantly different in the groups (p < 0.001). The highest values of bond strength were seen in G2, G1, and G3 (359.97 ± 81.26, 333.79 ± 98.96, 309.27 ± 78.07), respectively. There was no significant difference between G4 and G5 (p = 0.75). Conclusion The results showed that CH, CH+CHX, and TAP enhanced the pull-out bond strength of fiber post to root canal wall as compared to the control group.

scholarly journals Relining effects on the push-out shear bond strength of glass fiber posts

2016 ◽  
Vol 45 (4) ◽  
pp. 227-233
Author(s):  
Adriana Rosado Valente ANDRIOLI ◽  
Margareth COUTINHO ◽  
Andréa Araújo de VASCONCELLOS ◽  
Milton Edson MIRANDA
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Shear Bond Strength ◽  
Resin Cement ◽  
Cervical Region ◽  
Adhesive Resin ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
Adhesive Resin Cement ◽  
Push Out

Abstract Introduction The correct use of glass fiber posts in endodontically treated teeth is essential for the clinical success of restorative treatment. Objective This study evaluated the push-out shear bond strength of relined (R) or non-relined (NR) glass fiber posts, cemented with self-adhesive resin cement [RelyXTM U100 (U100)] and conventional resin cement [RelyXTM ARC (ARC)]. Material and method Sixty human single-rooted teeth were endodontically treated and divided into ARC-NR; U100-NR; ARC-R; U100-R groups. The teeth were sectioned into cervical, middle and apical thirds, and subjected to the push-out test. Bond strength was analyzed by the Friedman test; cement and post types were compared by the Mann Whitney test. The pattern of failures was evaluated with digital camera through images at 200x magnification, and was classified as adhesive (at the cement/dentin or cement/post interface), cohesive (cement or post), and mixed failures. Result In ARC-NR, bond strength values were higher in the cervical third; in U100-NR and ARC-R they were similar between the thirds. In U100-R, in the cervical and middle thirds the bond strength values were similar, and there was lower value in the apical third. For non-relined glass fiber posts, the highest mean bond strength values were observed with self-adhesive resin cement. Whereas, relined posts cemented with conventional resin cement had stronger cement layer in comparison with non-relined fiber posts. Conclusion The post relining technique was efficient in ARC-R. ARC-NR and U100-R showed improved bond strength in the cervical region of canal walls. The main failures were adhesive at the cement-post interface.

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