Dental and Medical Problems

Dent Med Probl
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ISSN 1644-387X (print)
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Dental and Medical Problems

2011, vol. 48, nr 3, July-September, p. 380–387

Publication type: original article

Language: English

Mechanical Properties of Poured Aramid Fiber Reinforced Acrylic Resin Depending on Fiber Quantity, Fiber Position and Different Wetting Agents

Właściwości mechaniczne wlewowej żywicy akrylowej wzmocnionej włóknem aramidowym w zależności od liczby i położenia włókien oraz różnych czynników wiążących

Zbigniew Raszewski1,, Danuta Nowakowska2,

1 Zhermapol Poland, Warsaw

2 Division of Dental Materials, Department of Dental Prosthetics, Wroclaw Medical University, Poland

Abstract

Background. Acrylic resin used in restorative dentistry is the most popular denture base material. However due to its limited mechanical properties, different methods to reinforce are required.
Objectives. To investigate the effect of various quantities and position of aramid fibers (AF) covered by different bifunctional acrylic monomers on the flexural properties of cold couring acrylic resin (AR) suitable for the pouring method.
Material and Methods. Colacryl TS 2027® (Lucite) denture base test specimens were reinforced with various quantity unidirectional aramid fibers Tawaron® (Teijin) in different position in the samples. The fibres surface was pretreated with methacrylic polymer solution alone and with combinations of methacrylic monomers (Bis GMA, UDMA, methacrylic oligomer with polycarboxylic acid group). Control specimens were not fiber reinforced. Flexural properties of aramid fibers reinforced acrylic resins (AFRAR) were determined in dry condition after 24 hours at 23º ± 1ºC and after 7 day water immersion at 37º ± 1ºC. The test was performed by a three-point bending test using Instron type 4411 tensile testing machine.
Results. Flexural resistance of the aramid fiber reinforced acrylic resin (AFRAR) grew with a increasing number of fiber bundle in the sample. Positioning of fibers in the opposite direction to the breaking force effectively increased the flexural strength. Best results were obtained with Bis GMA methacrylic monomer which is a good cross linking agent for AF.
Conclusion. Unidirectional AF with methacrylic polyfunctional monomers pretreated surface, may find application in restorative dentistry for the purpose of increasing the mechanical properties of poured acrylic resins used as denture base material.

Streszczenie

Wprowadzenie. Tworzywo akrylowe stosowane w stomatologii odtwórczej, jako najbardziej popularny materiał do wykonania protez ruchomych, wykazuje ograniczoną wytrzymałość mechaniczną i dlatego proponuje się różne metody jego wzmocnienia.
Cel pracy. Określenie wpływu liczby oraz położenia włókna aramidowego (AF) zwilżonego różnymi środkami łączącymi na właściwości mechaniczne wlewowej żywicy akrylowej (AR).
Materiał i metody. Próbki z żywicy akrylowej Colacryl TS 2027® (Lucite) wzmocniono jednokierunkowym włóknem aramidowym Tawaron® (Teijin), które umieszczano w górnej i dolnej części próbek, wielokierunkowo oraz pionowo. Włókno było wcześniej zwilżone różnymi czynnikami łączącymi (tylko metakrylanem metylu oraz w kombinacji z innymi monomerami). Oceniono właściwości mechaniczne wzmocnionego tworzywa przechowywanego w warunkach suchych w temperaturze 23 ± 1ºC przez 24 godz. po wykonaniu próbek oraz po 7 dniach przechowywania w wodzie w temperaturze 37 ± 1ºC. Próbkami odniesienia były próbki niewzmocnione włóknem aramidowym. Badanie wykonano w zrywarce Instron typu 4411.
Wyniki. Wytrzymałość na zginanie próbek akrylowych wzmocnionych włóknami aramidowymi (AFRAR) zwiększyła się ze zwiększeniem liczby włókien w próbce, a także wówczas, gdy włókno było ułożone po stronie przeciwnej do kierunku działania siły. Najkorzystniejsze wyniki otrzymano dla monomeru Bis GMA, który tworzy wiązania wodorowe z włóknami aramidowymi.
Wnioski. Jednokierunkowe włókna aramidowe o powierzchni zwilżonej wielofunkcyjnym monomerem metakrylowym mogą znaleźć zastosowanie w stomatologii odtwórczej w celu polepszenia mechanicznych właściwości wlewowych żywic akrylowych stosowanych do wykonania płyt protez.

Key words

aramid fibers, acrylic resin, mechanical properties

Słowa kluczowe

włókna aramidowe, żywica akrylowa, właściwości mechaniczne

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