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CC BY-NC-ND 4.0 · Eur J Dent 2020; 14(04): 644-650
DOI: 10.1055/s-0040-1716630
Original Article

Evaluation of the Bond Strength and Marginal Seal of Indirect Restorations of Composites Bonded with Preheating Resin

Manuel Salvador Urcuyo Alvarado
1   Department of the Specialty in Aesthetic, Cosmetic, Restorative, and Implantological Dentistry, Faculty of Stomatology, Autonomous University of San Luis Potosí, San Luis Potosí, México
,
Diana María Escobar García
2   Laboratory of Basic Science, Faculty of Dentistry, Autonomous University of San Luis Potosí, San Luis Potosí, México
,
Amaury de Jesús Pozos Guillén
2   Laboratory of Basic Science, Faculty of Dentistry, Autonomous University of San Luis Potosí, San Luis Potosí, México
,
Juan Carlos Flores Arriaga
2   Laboratory of Basic Science, Faculty of Dentistry, Autonomous University of San Luis Potosí, San Luis Potosí, México
,
Gabriel Fernando Romo Ramírez
1   Department of the Specialty in Aesthetic, Cosmetic, Restorative, and Implantological Dentistry, Faculty of Stomatology, Autonomous University of San Luis Potosí, San Luis Potosí, México
,
Marine Ortiz Magdaleno
2   Laboratory of Basic Science, Faculty of Dentistry, Autonomous University of San Luis Potosí, San Luis Potosí, México
› Author Affiliations Funding This work was supported by a grant to M.S.U.A. as a CONACYT fellow (grant number: 6118114/574819).
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Abstract

Objective Preheated resins (PR) are considered a cementing agent option for indirect adhesive restorations of composite inlays and onlays. The objective of this in vitro study was to evaluate the marginal sealing, adhesive interface, and microtensile bond strength of indirect adhesive restorations of composites in terms of dentin cemented with PR.

Materials and Methods Standardized Class II preparations were performed on 30 extracted human premolars, impressions were taken, and indirect composite restorations were manufactured. In total, 15 restorations were cemented with PR (ENA HRi, SYNCA), and 15 restorations were cemented with self-adhesive resinous cement (RC) (Relyx U200, 3M ESPE), followed by a thermocycling regime. After that, these were segmented sagittally and longitudinally to evaluate the marginal sealing and the adhesive interface with scanning electron microscopy and confocal microscopy. Microtensile bond strength was assessed with a mechanical device (TA. XT Plus C, Stable Micro System).

Statistical analysis Statistical analysis was conducted using the two-sample Student’s t-test.

Results The results showed that there is no statistically significant difference in the degree of microfiltration using PR or RC; however, microtensile bond strength is greater when the restoration is cemented with RC (278.75 N/cm3) than with PR (144.49 N/cm3), and better adjustment and sealing were observed for composite restorations with PR.

Conclusion PR comprise an alternative cementing agent for indirect composite restorations in Class II cavities in premolars.

Keywords

preheated resin - marginal sealing - indirect restorations - microtensile bond strength - adhesive interface


Publication History

Article published online:
15 September 2020

© .

Thieme Medical and Scientific Publishers Private Ltd.
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