Effect of Magnification during Post Space Preparation on Root Cleanness and Fiber Post Bond Strength

Abstract The aim of this study was to evaluate the effect of magnification during post space preparation on root cleanness and on fiber post bond strength. Methods: Thirty human central upper incisors with similar root canal in size and shape were selected, decoronated to 15 mm and endodontically filled. The teeth were assigned into 3 groups (n=10), according to the method of magnification during post space preparation inspection: Control, using naked eye; loupe, using a dental surgical 3x magnifying glass; surgical microscope, using a 6x surgical microscope. The roots were scanned by using micro-CT before and after post space preparation for residue remnants evaluation. Fiber posts were cemented using self-adhesive resin cement (Rely X U200, 3M-ESPE). Two 1-mm-thick slices from the cervical, medium and apical thirds were submitted to a push-out test (PBS). Failures modes were classified. PBS data were analyzed by using two-way ANOVA with repeated measurement and the Tukey test. The significance level was set at 5%. The method of visualization had no effect on PBS (p=0.556). The cervical region had higher values than apical region irrespective of the inspection method (p=0.012). Adhesive failure between the resin cement and dentin was the prevalent failure mode for all groups. Micro-CT analysis showed no difference on root cleanness into the root canal after post space preparation. The use of magnification devices as loupe and microscope while performing post space do not improve the PBS and did not affect sealer remain of decoronated anterior teeth.

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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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Effect of Chlorhexidine Treatment Prior to Fiber Post Cementation on Long-Term Resin Cement Bond Strength

Operative Dentistry ◽

10.2341/16-241-lr2 ◽

2018 ◽

Vol 43 (2) ◽

pp. E72-E80 ◽

Cited By ~ 1

Author(s):

M Durski ◽

M Metz ◽

G Crim ◽

S Hass ◽

R Mazur ◽

...

Keyword(s):

Bond Strength ◽

Root Canal ◽

Vertical Axis ◽

Resin Cement ◽

Fiber Post ◽

Resin Cements ◽

Single Root ◽

Number Of Cycles ◽

Push Out

SUMMARY The purpose of this study was to evaluate the push-out bond strength of two different adhesive cements (total etch and self-adhesive) for glass fiber post (GFP) cementation in simulated, long-term service (thermocycling) when the root canal is treated with chlorhexidine before cementation. One hundred twenty premolar specimens with a single root canal were selected, endodontically treated, and shaped for GFP cementation (n=120). The specimens were randomly placed into one of 12 groups (10 specimens each) according to cement (T = total-etch RelyX ARC or S = self-adhesive RelyX Unicem), treatment with chlorhexidine (N or Y: without or with), and number of thermal cycles (00, 20, or 40: 0, or 20,000 or 40,000 cycles): 1. TN00, 2. TN20, 3. TN40, 4. TY00, 5. TY20, 6. TY40, 7. SN00, 8. SN20, 9. SN40, 10. SY00, 11. SY20, 12. SY40. The root of each specimen was cut perpendicular to the vertical axis, yielding six 1.0 mm-thick sections. A push-out bond strength test was performed followed by statistical analysis using a factorial analysis of variance. Pairwise comparisons of significant factor interactions were adjusted using the Tukey test. Significant differences of push-out bond strengths were found in the four main effects (resin cement [p<0.0001], treatment with chlorhexidine [p<0.0001], number of cycles [p<0.0001], and root third [p<0.0001]) and all interactions (p<0.05 for all). Both resin cements produced higher bond strength in the cervical third followed by the middle third, and lower values were detected in the apical third. Additionally, the results suggest that the use of an additional disinfection treatment with chlorhexidine before the cement application produced the highest push-out bond strength regardless of root third. Further, the thermocycling simulation decreased the bond strength for both resin cements long-term when the chlorhexidine was not applied before cementation. However, when the root canal was treated with chlorhexidine and the fiber post was cemented with self-adhesive cement, the bond strength increased after 0, 20,000 and 40,000 cycles.

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Root Dentin Strain and Temperature Rise During Endodontic Treatment and Post Rehabilitation

Brazilian Dental Journal ◽

10.1590/0103-6440201302268 ◽

2013 ◽

Vol 24 (6) ◽

pp. 591-598 ◽

Cited By ~ 4

Author(s):

Euridsse Sulemane Amade ◽

Veridiana Resende Novais ◽

Marina Guimaraes Roscoe ◽

Fabiane Maria Ferreira Azevedo ◽

Aline Aredes Bicalho ◽

...

Keyword(s):

Temperature Rise ◽

Root Canal ◽

Root Surface ◽

Endodontic Treatment ◽

Resin Cement ◽

Cervical Region ◽

Apical Region ◽

Root Canal Filling ◽

Root Dentin ◽

Post Space

This study investigated the effects of endodontic treatment procedures and different post systems rehabilitation steps on the strain and temperature rise on apical and cervical root dentin regions. Twenty-one extracted human canine teeth had two strain gages attached to the distal root surface and two thermocouples attached to the mesial root surface (cervical and apical). The strain and temperature rise were recorded during the following procedures: root canal preparation, final rinse and drying, root canal filling and canal relief. Then the teeth were divided into three groups (n=7), according to the type of post system: CPC, cast post and core; FGP, fiberglass post; and PSP, prefabricated steel post. Data continued to be recorded during the post space preparation, post modeling (only for CPC), post trying and post cementation. Data were subjected to a two-way ANOVA followed by Tukey's test (α=0.05). The post-space preparation caused the highest temperature rise (4.0-14.9 °C) and the highest strain in the apical region during irrespective of post type. The resin cement light-activation resulted in significant temperature increases in the cervical region for all of the groups. The canal relief and the post-space preparation produced highest temperature rises. The CPC post modeling resulted in higher root strain level similarly the level of post preparation. The PSP resulted in highest strain during post trying and post cementation.

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Effect of different post space irrigation procedures on the bond strength of a fiber post attached with a self-adhesive resin cement

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2015.10.010 ◽

2016 ◽

Vol 115 (5) ◽

pp. 601-605 ◽

Cited By ~ 13

Author(s):

Esra Kul ◽

Kübra Yesildal Yeter ◽

Lütfü Ihsan Aladag ◽

Leyla Benan Ayrancı

Keyword(s):

Bond Strength ◽

Resin Cement ◽

Fiber Post ◽

Adhesive Resin ◽

Adhesive Resin Cement ◽

Post Space

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COMPARATIVE EVALUATION OF PUSH-OUT BOND STRENGTH OF FIBER POST LUTED INSIDE THE ROOT CANAL USING LIGHT CURE FLOWABLE COMPOSITE AND DUAL CURE RESIN - AN INVITRO STUDY

International Journal of Advanced Research ◽

10.21474/ijar01/12390 ◽

2021 ◽

Vol 9 (01) ◽

pp. 1058-1064

Author(s):

Aamir Bashir ◽

◽

Adil Fayaz ◽

Sandeep Kaur Bali ◽

Shazana Nazir Qazi ◽

...

Keyword(s):

Bond Strength ◽

Root Canal ◽

Testing Machine ◽

Storage Period ◽

Resin Cement ◽

Fiber Post ◽

Maxillary Central Incisor ◽

Flowable Composite ◽

Luting Agents ◽

Push Out

Aim: The aim of this study was to compare by means of Push-Out test the difference in bond strength of two different luting agents with fibre post, and the effect of anatomical root levels on the bond strength of each cement. Materials and Methods: A total of 40 freshly extracted maxillary central incisor and canine teeth were included in the study. The teeth were divided into two groups of twenty each, and were assigned to Groups A and B according to the luting agent (light cure, dual cure) used to cement the post inside the root canal. After decoronation, 10 mm standardized post spaces were prepared inside each root. Luting of fiber posts was carried out, as per manufacturers recommendations, with the respective luting agents. Each root was embedded in a cuboidal plaster block and sectioning was carried out to obtain three slices of 2.5 mm thickness from the coronal, middle and apical aspect of the root. This was followed by Push-Out testing on a Universal Testing Machine after a storage period of 2 months. The recorded data were subjected to statistical analysis. Results: Significant differences were found in the bond strength of light cure flowable composite and dual cure resin cement (p<.05) at different anatomical root levels. In the inter-group comparison it was found that dual cure presents superior mean bond strength in comparison with light cure composite. Conclusion: It was concluded from this study that dual cure resin cement is the best material for luting fiber post to root canal. The push-out bond strength was lower in the apical third than the coronal third for light activated cements. Also, light cure flowable composite performs better when shorter posts are used.

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Resin push-out bonding strength to root canal dentin: effect of the irrigation solution application prior to post cementation

Brazilian Dental Science ◽

10.14295/bds.2017.v20i2.1426 ◽

2017 ◽

Vol 20 (2) ◽

pp. 85 ◽

Cited By ~ 1

Author(s):

Silvia Michida ◽

Amanda Maria de Oliveira Dal Piva ◽

João Paulo Mendes Tribst ◽

Rodrigo Othávio Assunção Souza ◽

Geraldo Lombardo ◽

...

Keyword(s):

Bond Strength ◽

Root Canal ◽

Adhesive System ◽

Resin Cement ◽

Fiber Post ◽

Root Canals ◽

Irrigation Solution ◽

Root Canal Dentin ◽

Push Out ◽

Resin Bonding

Objective: To evaluate the effect of different irrigation solutions prior to post cementation on the resin bonding to bovine root dentine. Material and Methods: 60 bovine roots (16 mm) were prepared to 12 mm with specific drill of a double-tapered fiber post system, included in PMMA, and divided into 6 groups, considering the irrigation solutions (IS) prior to cementation: Gr1- saline solution (control), Gr2- NaOCl 0.5 %, Gr3- NaOCl 1 %, Gr4- NaOCl 2.5 %, Gr5- NaOCl 5 %, Gr6- Chlorexidine 2 % (solution). The root canals were irrigated with IS 20 ml during 10 min. Then they were rinsed with 20 ml of distilled water and dried with paper points. One fiber post was molded with polyvinylsiloxane and 60 posts made of resin cement (PRC) were obtained moments before the cementation. The root canal dentin was etched with H2PO3 37 %/15 s + washing/drying, a multi-bottle etch&rinse adhesive system was applied and the PRC were resin luted with dual resin cement (DuolinkTM, Bisco). Each specimen was cut into 4 slices of ±1.8mm in thickness and submitted to push-out test (1 mm/min). Results: ANOVA showed that bond strength was significantly affected by IS (P<0.0001). The highest bond strengths (MPa) were those for the groups 4 (3.51 ± 1.52) and 5 (3.0 ± 1.16). The groups 1 (0.70 ± 0.30), 2 (0.80 ± 0.24), 3 (1.26 ± 0.57) and 6 (0.90 ± 0.41) were statistically similar to each other. Conclusion: The resin bonding to the root dentine was higher when higher concentrations of hypochlorite solutions were used.KeywordsBond strength; Irrigation solutions; Push-out test; Resin cement; Root canal dentin.

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Customized Fiber Post Improves the Bond Strength and Dentinal Penetrability of Resin Cementation System to Root Dentin

Operative Dentistry ◽

10.2341/20-117-l ◽

2021 ◽

Author(s):

TP Leandrin ◽

E Fernández ◽

RO Lima ◽

JF Besegato ◽

WG Escalante-Otárola ◽

...

Keyword(s):

Bond Strength ◽

Laser Scanning ◽

Resin Composite ◽

Resin Cement ◽

Laser Scanning Microscopy ◽

Mixed Data ◽

Confocal Laser ◽

Fiber Post ◽

Root Dentin ◽

Post Space

SUMMARY Objective: This study aimed to evaluate the effect of fiber post customization on the bond strength (24 hours and 6 months), resin cement thickness, and dentinal penetrability of Adper Scotchbond Multi-Purpose – RelyX ARC (AS-RA), RelyX U200 (R2), and Scotchbond Universal – RelyX Ultimate (SU-RU) cementation systems to root dentin from the cervical-, middle-, and apical-thirds of the post space. Methods: One hundred twenty bovine incisors were endodontically treated. After post space preparation, the roots were divided into six groups, according to the luting protocols (AS–RA, R2, SU– RU) and the type of fiber post [noncustomized post (NC) and customized post (C)]. Customization procedures were peformed using a resin composite (Z350 XT). 24 hours (n=60) or 6 months later (n=60), specimens from the cervical-, middle-, and apical-thirds of the post space were submitted to cementation system thickness measurement, bond strength evaluation, and dentinal penetrability analysis with Confocal Laser Scanning Microscopy (CLSM). Failure mode was classified as adhesive, cohesive, or mixed. Data were submitted to ANOVA and Tukey tests (α=0.05). Results: Cementation protocols with customized fiber posts presented the lowest cementation system thickness, regardless of the cementation system or post space-third (p<0.05), and the highest bond strength values (p<0.05), regardless of the third space (p>0.05), for both periods (24 hours or 6 months). The comparison of push-out bond strength values between 24 hours and 6 months showed a reduction in all groups for the cervical-third (p<0.05). For the middle-third, only noncustomized groups showed reduction (p<0.05). For the apical-third, no reduction was observed (p>0.05). Conclusions: Anatomical customization favored both the bond strength of cements to dentin and the dentinal penetrability, but with lower cementation system thickness, regardless of cement composition and adhesive strategy.

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Effect of fiber post space irrigation with different peracetic acid formulations on the bond strength and penetration into the dentinal tubules of self-etching resin cement

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2019.03.020 ◽

2019 ◽

Vol 122 (1) ◽

pp. 46.e1-46.e7

Author(s):

Lauriê Garcia Belizário ◽

Milton Carlos Kuga ◽

Marco Antônio Hungaro Duarte ◽

Marcus Vinicius Reis Só ◽

Kátia Cristina Keine ◽

...

Keyword(s):

Bond Strength ◽

Peracetic Acid ◽

Resin Cement ◽

Fiber Post ◽

Dentinal Tubules ◽

Post Space

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Effect of Biomimetic Remineralization of Post Space Root Dentin on Push out Bond Strength of Fiber Post bonded with Self-adhesive Resin Cement (An in Vitro Study)

10.21203/rs.3.pex-1243/v1 ◽

2020 ◽

Author(s):

Afaf Mohamed Al-Najajrah ◽

Carl Hany Halim ◽

Omnia Nabil

Keyword(s):

Bond Strength ◽

Bonding Strength ◽

In Vitro Study ◽

Resin Cement ◽

Fiber Post ◽

Adhesive Resin ◽

Adhesive Resin Cement ◽

Post Space ◽

Push Out

Abstract Self-adhesive resin cement is highly recommended for cementation of fiber post systems, since it binds chemically with calcium ions in the hydroxyapatite particles without surface pretreatments of dentin. Unfortunately, chelating agents that are used to remove smear layer reduce the calcium ion content of superficial dentin. This study aims to evaluate the effect of remineralization of dentin on the bonding strength of fiber post using the biomimetic remineralizing agent CPP-ACP in vitro. Such a study will provide evidence on the possibility of improving bonding strength by increasing dentin mineral content. At the same time, it should be supported by further clinical studies since it remains in vitro.21 freshly extracted single rooted teeth will be treated endodontically, prepared for post space, and divided randomly into 3 groups: EDTA+CPP-ACP, EDTA + NaOCl, EDTA alone. Fiber post will be cemented and push out bond strength will be measured for all groups. The expected time of study is 6-8 months.

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Effect of Intracanal Irrigants on Bond Strength of Fiber Posts Cemented With a Self-adhesive Resin Cement

Operative Dentistry ◽

10.2341/15-246-l ◽

2016 ◽

Vol 41 (6) ◽

pp. e159-e167 ◽

Cited By ~ 9

Author(s):

MS Barreto ◽

RA Rosa ◽

VG Seballos ◽

E Machado ◽

LF Valandro ◽

...

Keyword(s):

Bond Strength ◽

Root Canal ◽

Resin Cement ◽

Laser Scanning Microscopy ◽

Fiber Post ◽

Ultrasonic Activation ◽

Adhesive Resin ◽

Universal System ◽

Fiber Posts ◽

Adhesive Resin Cement

SUMMARY Objective: The aim of this study was to evaluate the effect of five intracanal irrigants on bond strength of fiber posts cemented with newer self-adhesive resin cement. Methods: A total of 60 extracted, single-rooted human premolars, sectioned at 14 mm, were prepared with the ProTaper Universal system with a size F3 instrument and filled with an F3 master cone and AH Plus. The root canal filling was partially removed, leaving 4 mm of apical gutta-percha. Specimens were randomly assigned to five groups (n=12), according to the solution used for dentin surface treatment before fiber post cementation, as follows: EDTA 17% (EDTA); QMix (QM); SmearClear (SC); 2.5% sodium hypochlorite (NaOCl), and 0.9% saline solution (SS). Ultrasonic activation was performed (three times, 20 seconds each), and root canals were dried with paper points. Fiber posts were cemented with RelyX U200. In one specimen per group, rhodamine B dye was mixed with RelyX U200 to provide adequate fluorescence for confocal laser scanning microscopy (CLSM) assessment. Specimens were transversally sectioned and three slices were obtained, one for each root third. Next, a push-out test was performed. A stereomicroscope and CLSM were used to analyze the failure modes and to illustrate the pattern of infiltration of RelyX U200 into dentinal tubules, respectively. Bond strength means were calculated, and analysis of variance and Bonferroni tests were used for statistical analysis. Results: SS showed the highest mean bond strength values (11.5±5.3), superior to QM (5.1±3.1) and SC (5.1±3.3). NaOCl presented intermediary bond strength values (9.7±5.0), similar to EDTA (7.7±2.9) and SS. QM and SC showed the lowest mean bond strength (p<0.05). Adhesive failures between cement/dentin were predominant (53.9%). Conclusion: SS and NaOCl associated with ultrasonic activation seem to be adequate solutions for root canal cleaning before fiber post cementation with self-adhesive resin cement, whereas chelating solutions, such as EDTA, QM, and SC, cause a decrease in bond strength.

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