Residual monomer of reline acrylic resins

Urban, Vanessa Migliorini; Machado, Ana Lúcia; Oliveira, Regina V.; Vergani, Carlos Eduardo; Pavarina, Ana Cláudia; Cass, Quézia B.

doi:10.1016/j.dental.2006.01.021

Cited by 93 publications

(68 citation statements)

References 18 publications

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“…1 and 2). It has been reported that post-curing microwave irradiation could reduce the amount of residual monomers [41]. Although the report did not find out the underlying reason, nor residual monomer analysis such as chromatography was not conducted in the current study, the specimens were treated solely with the microwave irradiation.…”

Section: Discussionmentioning

confidence: 93%

A New Approach to Cure and Reinforce Cold-Cured Acrylics

Tsoi

Matinlinna

2012

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Purpose The low degree of polymerization of coldcured acrylics has resulted in inferior mechanical properties and fracture vulnerability in orthodontics removable appliances. Methods In this study, the effect of reinforcement by various concentrations of chopped E-glass fibers (0%, 1%, 2%, 3% and 5% by weight of resin powder) and post-curing microwave irradiation (800 W for 3 min) on the flexural strength of cold-cured acrylics was evaluated at various storage conditions (at room temperature for 1 day and 7 days; at water storage for 7, 14 and 30 days). Results The data was analyzed by using 1-way and 2-way ANOVA, and a Tukey post hoc test (α = .05). The specimens with chopped E-glass fibers treated with post-curing microwave irradiation significantly increased the flexural strength of cold-cured PMMA. The optimal concentration might be 2% fibers under irradiation. Conclusions The exhibited reinforcement effect lasted in a consistent trend for 14 days in water storage. A new fiber-acrylic mixing method was also developed.

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Section: Discussionmentioning

confidence: 93%

A New Approach to Cure and Reinforce Cold-Cured Acrylics

Tsoi

Matinlinna

2012

Silicon

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“…Nowadays, it is very common to use compounds to provide greater strength to the resin and some studies show that the addition of fiberglass can increase resistance to rupture and flexion of the material (URBAN et al, 2007;TELLES et al, 2009). When evaluating the flexural strength of orthodontic acrylic resins from two different manufacturers, comparing pigmented resins with colorless ones, concluded that the pigments have no effect on the decrease of acrylic resin flexural strength (TELLES et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Influence of the manipulation technique of acrylic resin on mechanical strength of orthodontic plates

Pithon¹,

Santos²,

Soares³

et al. 2015

Biosci. J.

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ABSTRACT:The focus of this study was to test the fracture resistance of upper arch dental retainers, made by two different manipulation techniques of acrylic resin. 84 plates Wraparound type retainers were made by two different manipulation techniques forming two groups (n = 42): Group 1 (Addition Technique) and Group 2 (Pressing Technique). All the retainers were duly shaped in U form with the aid of standardized plaster cast models. During the confection process the standardizing of the retainers was conducted carefully regarding their thickness and dimensions with the aid of a gauge and a straight caliper. After confection they remained immersed in water for 24 hours at 37°C. Next, they were tested through mechanical compression until fracture in a universal mechanical testing machine. Data were analyzed by Student's t test. The significance level was set at 5% (α = 0.05). It was found that the average was of 79.12 N for Group 1 and of 77.07 N for Group 2 with a standard deviation of 17.30 N and 16.31, respectively, showing that there is no significant difference in resistance for the retainers when made through any of the two methods (P=0.788). The addition and pressure techniques of acrylic resin do not influence the resistance to compression of the upper dental retainers.

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“…Water-bath post-polymerization treatment has shown effectiveness in reducing amount 2 and leachability in artificial saliva 13 of residual monomer of polymerized acrylic resins. It can be assumed that a more complete polymerization could diminish the leaching of residual compounds, thus minimizing the risk of adverse reactions induced by methacrylate-based polymers.…”

Section: Introductionmentioning

confidence: 99%

“…1 It is known that the polymerization reaction does not result in complete conversion of the initial methacrylate moiety, and certain amounts of unreacted monomers remain in the polymer. 2,3 In addition, during clinical use, polymeric materials may undergo degradation due to mechanical, chemical, and thermal stresses. 4 Degradation can be caused by different mechanisms, such as oxidation, decomposition, and hydrolysis, [4][5][6] and may result in the formation of several by-products, among them methacrylic acid (MA) 5,7 and benzoic acid (BA).…”

Section: Introductionmentioning

confidence: 99%

Leachability of degradation products from hard chairside reline resins in artificial saliva: Effect of water‐bath post‐polymerization treatment

Urban

Machado

Vergani

et al. 2011

J of Applied Polymer Sci

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ABSTRACT:The effect of a post-polymerization treatment on the leaching of methacrylic acid (MA) and benzoic acid (BA) from the reline resins [Kooliner (K), New Truliner (N), Ufi Gel hard (U), and Tokuso Rebase Fast (T)] was evaluated. Specimens of each material were divided into two groups: Group C (control) -left untreated; Group WB (water-bath) -immersion in water at 55 6 1 C for 10 min. Specimens were placed in artificial saliva at 37 6 1 C and, after 1-, 3-, 5-, 24-h and 3-, 7-, 14-, and 30-day intervals, aliquots were removed and analyzed using high performance liquid chromatography. Data were analyzed by using Wilcoxon, Mann-Whitney or Kruskal-Wallis tests (a ¼ 0.05). At 1 h, the concentration of MA released from U control specimens was higher than those of the other ones, and decreased after 3 h. WB specimens released lower amounts of MA than control specimens only for material U, at the 1-and 3-h periods. For all control specimens, concentrations of leached BA progressively decreased within 5 h and from 24 h to the end. WB specimens released significantly lower amounts of BA than did the control groups. The highest concentration of MA was leached from control specimens of Ufi Gel hard. Water-bath post-polymerization treatment caused a significant reduction in elution of BA.

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Residual monomer of reline acrylic resins

Cited by 93 publications

References 18 publications

A New Approach to Cure and Reinforce Cold-Cured Acrylics

A New Approach to Cure and Reinforce Cold-Cured Acrylics

Influence of the manipulation technique of acrylic resin on mechanical strength of orthodontic plates

Leachability of degradation products from hard chairside reline resins in artificial saliva: Effect of water‐bath post‐polymerization treatment

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