Non-destructive evaluation of teeth restored with different composite resins using synchrotron based micro-imaging

Fatima, Anis; Kulkarni, Vinaya Kumar; Banda, Naveen Reddy; Agrawal, A. K.; Singh, Balwant; Sarkar, Partha Sarathi; Tripathi, S.; Shripathi, T.; Kashyap, Yogesh; Sinha, Alok

doi:10.3233/xst-160530

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…Additionally, the acquisition time for tomographic imaging with similar resolution to other techniques is 10 to 100 times faster (Betz et al, 2007). This enables researchers to swiftly image a large range of biomaterials inside the tooth structure (Mollica et al, 2004;De Santis et al, 2005;Zaslansky et al, 2011;Rominu et al, 2014;Hedayat et al, 2016;Fatima et al, 2016;Moinzadeh et al, 2016;Kriznar et al, 2019). Although in the experiments reported here the field of view was restricted to the centre of the specimen, additional overlapping imaging or future developments in next generation facilities will make it possible to image entire tooth crowns faster and at even higher resolutions.…”

Section: Discussionmentioning

confidence: 97%

Hard X-ray phase-contrast-enhanced micro-CT for quantifying interfaces within brittle dense root-filling-restored human teeth

Soares¹,

Blunck²,

Bitter³

et al. 2020

J Synchrotron Radiat

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Bonding of resin composite fillings, for example following root-canal treatment, is a challenge because remaining gaps grow and lead to failure. Here, phase-contrast-enhanced micro-computed tomography (PCE-CT) is used to explore methods of non-destructive quantification of the problem, so that countermeasures can be devised. Five human central incisors with damaged crowns were root-filled followed by restoration with a dental post. Thereafter, the crowns were rebuilt with a resin composite that was bonded conventionally to the tooth with a dental adhesive system (Futurabond U). Each sample was imaged by PCE-CT in a synchrotron facility (ID19, European Synchrotron Radiation Facility) with a pixel size of 650 nm. The reconstructed datasets from each sample were segmented and analysed in a semi-automated manner using ImageJ. PCE-CT at sub-micrometre resolution provided images with an impressive increased contrast and detail when compared with laboratory micro-computed tomography. The interface between the dental adhesive and the tooth was often strongly disrupted by the presence of large debonded gaps (on average 34% ± 15% on all surfaces). The thickness of the gaps spanned 2 µm to 16 µm. There was a large variability in the distribution of gaps within the bonding area in each sample, with some regions around the canal exhibiting up to 100% discontinuity. Although only several micrometres thick, the extensive wide gaps may serve as gateways to biofilm leakage, leading to failure of the restorations. They can also act as stress-raising `cracks' that are likely to expand over time in response to cyclic mechanical loading as a consequence of mastication. The observations here show how PCE-CT can be used as a non-destructive quantitative tool for understanding and improving the performance of clinically used bonded dental restorations.

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