Influence of incorporation of fluoroalkyl methacrylates on roughness and flexural strength of a denture base acrylic resin

Abstract

Fluorinated denture base acrylic resins can present more stable physical properties when compared with conventional polymers. This study evaluated the incorporation of a fluoroalkyl methacrylate (FMA) mixture in a denture base material and its effect on roughness and flexural strength. A swelling behavior assessment of acrylic resin specimens (n=3, per substance) after 12 h of FMA or methyl methacrylate (MMA) immersion was conducted to determine the solvent properties. Rectangular specimens (n=30) were allocated to three groups, according to the concentration of FMA substituted into the monomer component of a heat-polymerized acrylic resin (Lucitone 550), as follows: 0% (control), 10% and 20% (v/v). Acrylic resin mixed with concentrations of 25% or more did not reach the dough stage and was not viable. The surface roughness and flexural strength of the specimens were tested. Variables were analyzed by ANOVA and Tukey's test (α=0.05). Immersion in FMA produced negligible swelling, and MMA produced obvious swelling and dissolution of the specimens. Surface roughness at concentrations of 0%, 10% and 20% were: 0.25 ± 0.04, 0.24 ± 0.04, 0.22 ± 0.03 μm (F=1.78; p=0.189, not significant). Significant differences were found for flexural strength (F=15.92; p<0.001) and modulus of elasticity (F=7.67; p=0.002), with the following results: 96 ± 6, 82 ± 5, 84 ± 6 MPa, and 2,717 ± 79, 2,558 ± 128, 2574 ± 87 MPa, respectively. The solvent properties of FMA against acrylic resin are weak, which would explain why concentrations over 20% were not viable. Surface changes were not detected after the incorporation of FMA in the denture base acrylic resin tested. The addition of FMA into denture base resin may lower the flexural strength and modulus of elasticity, regardless of the tested concentration.

Protez Temi̇zleyi̇ci̇leri̇ni̇n Akri̇lami̇d İlaveli̇ Protez Kai̇de Materyalleri̇n Yüzey Pürüzlülüğüne Etki̇si̇

“…Polimerlerin kimyasal yapılarındaki değiĢiklik ile bazı fiziksel ve mekanik özelliklerinin de değiĢebileceği bilinmektedir. [20][21][22] Akrilik rezin yapısına ilave edilen akrilamid monomeri metilmetakrilat monomeri ile kimyasal reaksiyona girerek kopolimer yapısı oluĢturmuĢ ve polimere yeni özellikler kazandırmıĢtır. Bu çalıĢma sonuçlarındaki rezinlerin yüzey pürüzlülük artıĢları kopolimerizasyonun bu etkisi ile açıklanabilir.…”

Flexural properties of ethyl or methyl methacrylate-UDMA blend polymers

“…There are several attempts [3][4][5][6][7][8][9][10][11][12][13][14][15][16] to increase the mechanical properties of denture base resins. One approach is to devise a reinforcement of denture base polymer with fibers, chips, or rods [12][13][14][15][16] .…”

“…Intraoral repeated masticatory forces lead to fatigue fracture, while extraorally impact fracture may occur as a result of dropping the denture onto the hard surface. Many attempts to improve the mechanical properties of polymethyl methacrylate (PMMA) have included using alternate polymers such as polycarbonate 3) , nylon 4,5) , copolymers 6,7) and urethane dimethacrylate (UDMA) 8,9) , and incorporating of butadiene-styrene rubber into PMMA matrix 10,11) . As another attempt, various fiber or chip materials [12][13][14][15][16] such as carbon, aramid and glass have been added into PMMA resin for reinforcing materials, and metal wires and meshes have ordinary been used for reinforcing materials to prevent the midline fracture of denture.…”

Reinforcement Of Acrylic Resin Denture Base Material By Copolymerisation Mechanism

“…Kopolimerizasyonun olumlu etkilerinin rapor edildiği çalışmaların yanında, olumsuz etkilerin rapor edildiği çalışmalar da literatürde görülmektedir. Cunha ve arkadaşları 30 , metil metakrilat esaslı protez kaide rezinlerine fluoroalkil metakrilat monomeri ilave ederek kopolimer yapı oluşturmuş ve elde edilen kopolimer rezinin, kontrol gruplarına göre daha düşük transvers dayanıklılık gösterdiğini bildirmişlerdir. Bunun nedenini ise, florualkil metakrilat homopolimerinin esas olarak zayıf bir madde olması ve mevcut özelliklerinin kopolimeri olumsuz etkilediği şeklinde açıklamışlardır.…”