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Curing profile and marginal gap formation using a liner containing long-wavelength-absorbing photoinitiator: an in vitro study

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Abstract

The aim was to evaluate the marginal-gap formation and curing profile of a new restorative technique using a liner with long-wavelength-absorbing photoinitiator (LWAP). Box-shaped preparations (6 mm × 4 mm × 4 mm) were made in third molars. All samples were treated with Clearfill SE Bond and divided into 4 groups (n = 5), according to restorative technique used: (1) incremental technique (INC-Technique); (2) camphorquinone-based liner (CQ-Liner) + bulk-fill resin composite; (3) LWAP-based liner (LWAP-Liner) + bulk-fill resin composite; and (4) bulk-fill technique without liner (BF-Technique). The marginal gaps (%) for all the samples were measured using micro-computed tomography. The restorations were cross-sectioned, and the degree of conversion (DC) and Knoop microhardness were evaluated at different depths (0.3, 1, 2, 3, and 4 mm). INC-Technique, CQ-Liner, and LWAP-Liner groups showed significantly fewer marginal gaps than those from the BF-Technique group. The BF-Technique specimens had the lowest DC and microhardness in depth. All the other techniques presented similar degree of conversion and microhardness at all the depths. The use of liners, regardless of the photoinitiator system, decreased the marginal-gap formation and improved the curing profile of bulk-filling restoration technique.

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Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

The authors thank to the staff of the Laboratory of Soft Materials at the Brazilian Laboratory of Nanotechnology (LNNano – CNPEM) for X-ray micro-CT analysis and instrumentation and Coordination for the Improvement of Higher Education Personnel (CAPES) by the financial support (Code 001). We thank Ultradent for the donation of the flowable composite resin.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, University of Campinas, 901 Limeira Avenue, Piracicaba, SP, Brazil

    May Anny Alves Fraga, Mário Alexandre Coelho Sinhoreti, Lourenço Correr-Sobrinho & Américo Bortolazzo Correr

  2. Department of Restorative Dental Science - Operative Division, College of Dentistry, University of Florida, 1395 Center Dr. Gainesville, Gainesville, FL, USA

    Dayane Carvalho Ramos Salles de Oliveira & Mateus Garcia Rocha

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  1. May Anny Alves Fraga
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  3. Mateus Garcia Rocha
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  4. Mário Alexandre Coelho Sinhoreti
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  5. Lourenço Correr-Sobrinho
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  6. Américo Bortolazzo Correr
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Contributions

Conceptualization: May Anny Alves Fraga, Dayane Carvalho Ramos Salles de Oliveira, Mateus Garcia Rocha, Américo Bortolazzo Correr. Methodology: May Anny Alves Fraga. Formal analysis and investigation: May Anny Alves Fraga. Writing — original draft preparation: May Anny Alves Fraga. Writing — review and editing: Dayane Carvalho Ramos Salles de Oliveira, Américo Bortolazzo Correr, Mário Alexandre Coelho Sinhoreti, Lourenço Correr-Sobrinho. Funding acquisition: Américo Bortolazzo Correr. Supervision: Américo Bortolazzo Correr.

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Correspondence to May Anny Alves Fraga.

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Fraga, M.A.A., de Oliveira, D.C.R.S., Rocha, M.G. et al. Curing profile and marginal gap formation using a liner containing long-wavelength-absorbing photoinitiator: an in vitro study. Lasers Med Sci 38, 69 (2023). https://doi.org/10.1007/s10103-023-03731-3

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