Dental and Medical Problems

Dent Med Probl
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Dental and Medical Problems

2014, vol. 51, nr 2, April-June, p. 197–204

Publication type: original article

Language: English

License: Creative Commons Attribution 3.0 Unported (CC BY 3.0)

Estimation of Self-Etch Adhesive System and Resin Cement Shear Bond Strength to Root Dentine with and without Prior Etching – Pull-Out Test and SEM Analysis

Ocena wpływu dodatkowego trawienia na wytrzymałość połączenia zębiny korzeniowej z wkładami koronowo-korzeniowymi wzmacnianymi włóknami szklanymi, cementowanymi za pomocą systemu samotrawiącego – test pull-out i analiza SEM

Mariusz Kochanowski1,A,B,C,E, Paulina Łagodzińska1,B,C,D, Jakub Marcinkowski2,A, Cezary Langot1,E, Leszek Klimek2,3,C,E,F

1 Department of Prosthetic Dentistry, Medical University of Lodz, Łódź, Poland

2 Department of Dental Technology of Chair of General Dentistry, Medical University of Lodz, Łódź, Poland

3 Department of Materials Research of Institute of Materials Science and Engineering, Lodz Univeristy of Technology, Łódź, Poland

Abstract

Background. De-bonding is still considered to be the most common cause of failure concerning fiber posts. The proper application of adhesive is, therefore, crucial to improve the bond strength.
Objectives. This study evaluated whether the additional etching before the application of cross-generation self-etch adhesive and resin cement can increase the shear bond strength between the root dentine and fiber post’s surface.
Material and Methods. Sixteen human one-canal teeth that had been extracted due to periodontal and orthodontic reasons were carefully selected for this study. They were divided into two groups of eight. Preparation of the specimens in both groups was equal except for the cementation procedure. The teeth were sectioned at the cementoenamel junction. The post space was prepared to a depth of 8 mm and a diameter of 1.5 mm with a special machine ensuring the repeatability of post spaces’ shape. Posts were cemented using self-etch adhesive; in one group the root dentine was previously etched and the second group was without pretreatment. Posts were cemented with the use of metal rings. Then specimens were embedded in acrylic resin blocks. They were subjected to pull-out test using a Universal Testing Machine specially adapted to maintain the parallelism – regimen. Finally, the posts’ surface was evaluated in SEM observation. Obtained results were statistically analyzed.
Results. The mean shear bond strength values for group with prior etching of dentine were significantly lower (8.22 MPa) than for the group without prior etching (11.25 MPa). These findings were supported by SEM observations, revealing that in the group with prior etching the resin-dentin-interface failure surpassed the resin-postinterface component.
Conclusion. Obtained results indicate that the self – etch adhesives’ bond strength to root dentine is decreased in case of prior etching.

Streszczenie

Wprowadzenie. Jednym z najczęściej spotykanych powikłań dotyczących wkładów wzmacnianych włóknami szklanymi (FRC) jest utrata retencji polegająca na ich odcementowaniu, dlatego właściwe zastosowanie systemów wiążących jest niezwykle ważne.
Cel pracy. Ocena wpływu dodatkowego wytrawienia zębiny na wytrzymałość połączenia między wkładami FRC a zębiną korzeniową po użyciu uniwersalnego systemu samotrawiącego typu cross-generation i cementu kompozytowego.
Materiał i metody. Badaniu poddano szesnaście jednokanałowych zębów usuniętych ze względów periodontologicznych lub ortodontycznych. Podzielono je na dwie grupy. Próbki w obu grupach przygotowano w jednakowy sposób, poza procedurą cementowania. Na wysokości połączenia szkliwno-cementowego odcięto korony zębów. Łoża pod wkłady wypreparowano na głębokość 8 mm i o średnicy 1,5 mm. W tym celu użyto maszyny zapewniającej powtarzalność kształtu łoża. Wkłady zacementowano z użyciem systemu samotrawiącego. W jednej grupie dodatkowo wytrawiono zębinę. Wkłady cementowano z użyciem metalowych pierścieni. Próbki zatopiono w akrylowych bloczkach i poddano je testowi wyciągania w uniwersalnej maszynie testującej, dbając o równoległość wszystkich elementów. Powierzchnię próbek poddano badaniu SEM.
Wyniki. Wykazano istotną statystycznie różnicę między wytrzymałością połączenia w grupie, w której dodatkowo wytrawiono zębinę (8,22 MPa) względem grupy, w której zębina nie była wytrawiona (11,25 MPa). Badania SEM wykazały, że w grupie z dodatkowym trawieniem połączenie było rozerwane głównie na granicy cement–zębina.
Wnioski. Uzyskane wyniki wskazują, że dodatkowe wytrawienie zębiny korzeniowej przed cementowaniem z użyciem systemów samotrawiących pogarsza wytrzymałość połączenia zębina korzeniowa–cement kompozytowy–wkład FRC.

Key words

fiber reinforced composite posts, self – etch adhesive, etching, root dentin, pull-out test

Słowa kluczowe

wkłady wzmacniane włóknami szklanymi, systemy samotrawiące, trawienie, zębina korzeniowa, test wyciągania

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