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How the translucency of direct anatomic fiber posts affects the bond strength and microhardness of a self-adhesive luting agent in flared roots

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Abstract

Objectives

To evaluate the influence of the composite resin translucency used in direct anatomic fiber posts on the bond strength (BS) and microhardness (VHN) of a luting agent into flared roots.

Materials and methods

The root canals of 70 single-rooted premolars were endodontically treated and prepared to simulate an oversized root canal. Prior to post cementation, composite resins with varying translucency (high translucent, HT; medium translucent, MT; high opacity, HO) were placed around the fiber posts to create anatomic fiber posts. The attenuation profile (%) of light passing either through the post or through the anatomic posts (n = 8) was obtained prior to the cementing procedures. A positive control group (PC) in which a prefabricated fiber post (PFP) with the diameter compatible with the root canal was cemented and a poorly adapted fiber post (negative control group, NC) were also evaluated. For both tests, the data were subjected to 2-way ANOVA and Bonferroni tests (α = 0.05).

Results

A more severe light attenuation through the post at the cervical (P < .001) and medium (P < 0.001) thirds was noted when less translucent composite resin surrounded the anatomic post. HO groups showed lower BS (P = .009) and VHN (P < .001) values than the other groups, regardless of root third. No significant difference in BS values was noted between PC and HT groups.

Conclusion

The use of a more translucent composite resin in anatomic fiber posts increased the microhardness and bond strength of a dual polymerization self-adhesive RLA compared to the use of MT and HO composite. A well-adapted PFP showed the highest adhesive and mechanical behavior.

Clinical relevance

Clinicians should choose more translucent composite resins to create direct anatomic fiber posts to be cemented in flared root canals. That choice may allow improved mechanical properties of self-adhesive RLA and higher bond strength to the root canal as a consequence.

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Authors and Affiliations

  1. Department of Restorative Dentistry, School of Dentistry, Diego de Robles Y Av. Interoceánica, Universidad San Francisco de Quito USFQ, Quito, Ecuador, 170901

    Camilo Pulido & Andrés Dávila-Sánchez

  2. Department of Restorative Dentistry. School of Dentistry, State University of Ponta Grossa. Ponta Grossa, Paraná, Brazil

    Osnara Mongruel Gomes, Alessandro Dourado Loguercio & Cesar Augusto Galvão Arrais

  3. Department of Physics, State University of Ponta Grossa. Ponta Grossa, Paraná, Brazil

    Fernando Camilotti & Gerson Kniphoff da Cruz

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  1. Camilo Pulido
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Correspondence to Camilo Pulido.

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This article does not contain any studies with human participants or animals performed by any of the authors. Human tissue (teeth) was obtained with written informed consent under an ethics-approved protocol (159.525) by the Bioethics Committee of the State University of Ponta Grossa—Brazil.

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Pulido, C., Gomes, O.M., Loguercio, A.D. et al. How the translucency of direct anatomic fiber posts affects the bond strength and microhardness of a self-adhesive luting agent in flared roots. Clin Oral Invest 26, 4447–4456 (2022). https://doi.org/10.1007/s00784-022-04408-x

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