3D micro-CT analysis of void formations and push-out bonding strength of resin cements used for fiber post cementation

Uzun, İsmail; Malkoç, Meral Arslan; Keleş, Ali; Öğreten, Ayşe Tuba

doi:10.4047/jap.2016.8.2.101

Cited by 20 publications

(15 citation statements)

References 35 publications

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“…The clinician and the compaction of composites in cavities here plays a critical role. Uzun and co-workers 45 also observed a similar feature in the cements tested at the apical third of the tooth structure. Voids can behave as initiation points for fracture and crack propagation, so reducing mechanical strength and wear resistance especially when located at the surface of the material.…”

Section: Discussionsupporting

confidence: 54%

Nano-CT as tool for characterization of dental resin composites

Haugen

Qasim

Matinlinna

et al. 2020

Sci Rep

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Technological advances have made it possible to examine dental resin composites using 3D nanometer resolution. This investigation aims to characterize existing dental nano-hybrid and micro-hybrid resin composites through comparing and contrasting nano-computed tomography (nano-CT) with micro-CT and high-resolution SEM images. Eight commercially available and widely used dental resin composites, 2 micro-hybrid and 6 nano-hybrid were researched. Cured samples were examined and characterized using nano-CT (resolution 450 nm) and compared with micro-CT images (resolution 2 µm). Acquired images were reconstructed and image analysis was carried out to determine porosity and pore morphology. A comprehensive comparison of scanning micrograph images unsurprisingly revealed that the nano-CT images displayed greater detail of the ultrastructure of cured dental resin composites. Filler particle diameters and its volumes were lower when measured using nano-CT, porosity being higher where analysed at higher resolution. There were large variations between the examined materials. Fewer voids were found in Tetric EvoCeram and IPS Empress Direct, the smallest pores being found in Universal XTE and Tetric EvoCeram. Nano-CT was successfully used to investigate the morphology of dental resin composites and showed that micro-CT gives a lower porosity and pore size but overestimates filler particle size. There were large discrepancies between the tested composites. Evidence of porosities and pores within a specimen is a critical finding and it might have a detrimental effect on a material’s clinical performance.

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Section: Discussionsupporting

confidence: 54%

Nano-CT as tool for characterization of dental resin composites

Haugen

Qasim

Matinlinna

et al. 2020

Sci Rep

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“…High-resolution micro-computed tomography (micro-CT) can measure the volume of three-dimensional shapes such as canals and gaps, analyzing the resin cement thickness and the voids presence around post materials (18). This methodology has been proved to be a powerful non-destructive 3D analysis, rapid, and powerful tool for visualizing the void parameters, the resin matrix, the internal structure and mechanical properties overcoming the limitations of the conventional methods (5,6,(19)(20)(21)(22)(23).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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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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“…Laboratory research has found that post cementation with self‐adhesive resins has a larger number of voids in the cervical third of the root canal as compared with the middle or apical thirds (Uzun et al . , Pedreira et al . ).…”

Section: Introductionmentioning

confidence: 99%

Gaps at the interface between dentine and self‐adhesive resin cement in post‐endodontic restorations quantified in 3D by phase contrast‐enhanced micro‐CT

et al. 2019

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Aim To assess the extent of gaps between root dentine and titanium or fibreglass post restorations following cementation with a self‐adhesive resin cement. Methodology Fourteen root filled maxillary central incisors restored with prefabricated posts made of Fibreglass (n = 7) or Titanium (n = 7) and cemented with RelyX Unicem 2 were imaged by rapid, high‐resolution phase contrast‐enhanced micro‐CT (PCE‐CT) in a synchrotron X‐ray imaging facility (ID19, ESRF, 34 KeV, 0.65 µm pixel resolution). Reconstructions were used to measure canal, cement and post perimeters and cross‐sectional areas and interfacial gaps at 0.1 mm increments in the root canal space, along the cervical region of the tooth. Remnants of endodontic sealer (AH Plus), when present, were also quantified. Mann–Whitney and 2‐way ANOVA tests were used to compare findings within slices and between the two post groups. Pearson correlation coefficients (r) were determined between the interfacial gaps and the other measured parameters. Results Clearly detectable gaps were found in 45% (±14%) of the interfaces between dentine and cement, along the canal in the cervical area of the tooth beneath the core. The length of interfacial gaps was moderately correlated to the canal cross‐sectional area, to the canal perimeter and to the canal area filled by cement (R = 0.52 ~ 0.55, P < 0.001). There was no significant difference between samples with fibreglass or titanium (P > 0.01). Both post types had defect‐free interfaces with cement. Endodontic sealer remnants were found on ~10% of the canal walls and were moderately correlated to the presence of gaps. Approximately 30% of the sealer‐affected interfaces exhibited no detachment between dentine, sealer and cement. Conclusions Self‐adhesive cements had interfacial gaps along substantial regions of the root canal surface, which was not correlated with the amount of cement in the canal. PCE‐CT proved to be an excellent non‐destructive method to study root canal restorations of hydrated samples in 3D.

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3D micro-CT analysis of void formations and push-out bonding strength of resin cements used for fiber post cementation

Cited by 20 publications

References 35 publications

Nano-CT as tool for characterization of dental resin composites

Nano-CT as tool for characterization of dental resin composites

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

Gaps at the interface between dentine and self‐adhesive resin cement in post‐endodontic restorations quantified in 3D by phase contrast‐enhanced micro‐CT

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