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Evaluation of polymerization shrinkage of bulk-fill resin composites using microcomputed tomography

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Clinical Oral Investigations Aims and scope Submit manuscript

Abstract

Objectives

This study evaluated the influence of cavity depth on polymerization shrinkage of bulk-fill resin composites with and without adhesive resin.

Materials and methods

Standardized box-shaped cavities (width, 4 mm; length, 5 mm, depth, 2 mm or 4 mm) were made on occlusal surfaces of extracted human third molars (N = 60). The teeth were assigned to 3 groups to receive bulk-fill resin composites (low-viscosity bulk-fill, SDR; high-viscosity bulk-fill; Filtek Bulk-Fill—FB; and TetricEvo Ceram Bulk-Fill—TB) in the prepared cavities with and without adhesive resin (Clearfil S3 Bond). Each specimen (n = 5 per group) was scanned twice using microcomputed tomography (micro-CT): once after application of the resin composite to the cavity prior to polymerisation and once after polymerisation. The shrinkage of volumetric loss (%) was measured using micro-CT. Data were analysed using Kruskal-Wallis and Mann-Whitney U tests (alpha = 0.05).

Results

The material type (p < 0.05), application of adhesive resin (p < 0.05) and cavity depth (p < 0.05) significantly affected the shrinkage values. The interaction terms were also significant (p < 0.05). All the bulk-fill resin composites tested showed significantly less shrinkage when applied in cavities with adhesive resin (0.94–2.55) compared with those without (2.01–3.45) (p < 0.05) and presented significantly more shrinkage after polymerisation (p < 0.05). At a 2-mm cavity depth without (2 mm, 2.28; 4 mm, 2.41) and with adhesive (2 mm, 0.94; 4 mm, 1.67), significantly less shrinkage was observed with FB compared with SDR and TB (p < 0.05). At a 4-mm cavity depth without (3.14) and with adhesive (2.55), SDR showed significantly higher shrinkage compared with FB and TB (p < 0.05).

Conclusions

The bulk-fill composites tested presented less shrinkage when used in conjunction with adhesive resin application on dentin. Overall, the low-viscosity bulk-fill resin SDR showed more shrinkage compared with high-viscosity resins tested.

Clinical relevance

Low- or high-viscosity bulk-fill resin composites should be applied on dentin after application of adhesive resin to decrease shrinkage.

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Funding

The work was supported by TUBITAK (Grant number: 215S840), Turkey.

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Authors and Affiliations

  1. School of Dentistry, Department of Restorative Dentistry, Esenler Medipol Hospital, Istanbul Medipol University, Birlik Mah. Bahçeler Cad. No: 5, Esenler, 34230, İstanbul, Turkey

    Kadriye Aybüke Ersen & Özge Gürbüz

  2. Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, University of Zürich, Zürich, Switzerland

    Mutlu Özcan

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  1. Kadriye Aybüke Ersen
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  2. Özge Gürbüz
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  3. Mutlu Özcan
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Correspondence to Kadriye Aybüke Ersen.

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Ersen, K.A., Gürbüz, Ö. & Özcan, M. Evaluation of polymerization shrinkage of bulk-fill resin composites using microcomputed tomography. Clin Oral Invest 24, 1687–1693 (2020). https://doi.org/10.1007/s00784-019-03025-5

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  • DOI: https://doi.org/10.1007/s00784-019-03025-5

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