In-vitro evaluation of the retention of different prefabricated posts luted with different cements

• Main Authors: Maksimović, Miloš, Špadijer Gostović, Aleksandra, Todorović, Ana, Todorović, Aleksandar, Romčević, Nebojša, Rudolf, Rebeka
• Format: Report
• Language: English
• Published: Inštitut za kovinske materiale in tehnologije 2015
• Subjects: retention; prefabricated titanium posts; fibre-reinforced composite posts; cements; pull-out testing; kompoziti; cementi; utrjevanje; preiskave materialov; zdržljivost; montažni titanovi stebrički; z vlakni utrjeni kompozitni stebrički; preizkušanje s puljenjem; info:eu-repo/classification/udc/669.017/.018:620.1; Ulita; samojed*
• Online Access: https://dk.um.si/IzpisGradiva.php?id=50202; https://dk.um.si/Dokument.php?id=109889&dn=; https://dk.um.si/Dokument.php?id=74760&dn=; https://plus.si.cobiss.net/opac7/bib/16491030?lang=sl

The aim of this study was to assess and compare the mechanical resistance and the retentive force of metal and composite post systems cemented with different types of cements. Three different designs of prefabricated titanium alloy posts were used in the study, i.e., active, passive and combined, as well as AgPd cast posts and two different fibre-reinforced composite post systems. In accordance with the experimental design these posts were cemented with zinc phosphate, self-curing composite resin or self-adhesive, self-etching, luting agent. Comparing the results between the different metal post designs, cemented with zinc phosphate, a statistically significant difference in the retention was found between all the analysed posts. The best results with the pull-out test were obtained with the active posts, then the passive, followed by the combined posts. The metal cast posts cemented conventionally with Zn-phosphate demonstrated the lowest retentive force value, based on all the measurements. The bond strengths between the post and the root dentine were influenced statistically by the post design (active, passive, combined or cast) and material, metal vs. composite. The active Ti posts showed significantly superior retention in combination with all the cements. The Ti alloy posts achieved higher retentive force values than the composite posts, in general. The composite cements compared to the Zn-phosphate ensure a better retentive strength for all the posts, including individually cast posts. Namen te študije je bil oceniti in primerjati mehansko odpornost in sile zadržanja kovinskih in kompozitnih stebričkov, utrjenih z različnimi vrstami cementov. V študiji so bile uporabljene tri različne konstrukcije stebričkov iz titanove zlitine – aktivna, pasivna in kombinirana, kot tudi uliti stebrički iz AgPd in dva različna sistema stebričkov, utrjenih z vlakni. Skladno z izvedbo preskusov so bili stebrički utrjeni s cink-fosfatom, s samopopravljivo kompozitno smolo ali samovezalnim samojedkalnim zamaznim sredstvom. Primerjava rezultatov med različnimi izvedbami kovinskih stebričkov, utrjenih s cink-fosfatom je pokazala statistično pomembno razliko v zdržljivosti analiziranih stebričkov. Najboljši rezultati pri preizkusu puljenja so bili doseženi pri aktivnih stebričkih, nato pri pasivnih, sledili so jim kombinirani stebrički. Kovinski uliti stebrički, utrjeni z navadnim cink-fosfatom so pokazali najmanjšo silo zdržljivosti, vključujoč vse meritve. Vezalna trdnost med stebričkom in korenom dentina je statistično odvisna od zasnove stebrička (aktivna, pasivna, kombinirana ali ulita) in materiala, kovine proti kompozitu. Aktivni Ti-stebriček je pokazal občutno boljšo zdržljivost v kombinaciji z vsemi cementi. Stebrički iz Ti-zlitine so na splošno dosegali višje sile odpornosti v primerjavi s kompozitnimi stebrički. Kompozitni cementi v primerjavi z Zn-fosfatom zagotavljajo boljšo zdržljivost povezave pri vseh stebričkih, vključno s posamično ulitimi stebrički.