Internal adaptation and some physical properties of methacrylate‐based denture base resins polymerized by different techniques

Ganzarolli, Solimar Maria; Mello, José Antônio Nunes de; Shinkai, Rosemary Sadami Arai; Cury, Altair Antoninha Del Bel

doi:10.1002/jbm.b.30718

Cited by 35 publications

(32 citation statements)

References 63 publications

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“…Although a standardized process in the weighing the impression material for evaluating denture adaptation has emphasized 11,18) , further variables, such as the mixing ratio, type of material, viscoelastic behavior with time and temperature, and applied load should also be considered 33) . The previous results reported an increase in the weight of the impression material trapped under the denture base after storage in water for 14-30 days 19,34) , while the maximum palatal gap of several denture bases decreased after storage in water for more than 14 days 24) . Therefore, a repeated measurement method for weighing impression materials of the denture base may produce an incorrect measure of the adaptation accuracy.…”

Section: Discussionmentioning

confidence: 84%

Comparative adaptation accuracy of acrylic denture bases evaluated by two different methods

et al. 2010

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This study examined the adaptation accuracy of acrylic denture base processed using fluid-resin (PERform), injection-moldings (SRIvocap, Success, Mak Press), and two compression-molding techniques. The adaptation accuracy was measured primarily by the posterior border gaps at the mid-palatal area using a microscope and subsequently by weighing of the weight of the impression material between the denture base and master cast using hand-mixed and automixed silicone. The correlation between the data measured using these two test methods was examined. The PERform and Mak Press produced significantly smaller maximum palatal gap dimensions than the other groups (p<0.05). Mak Press also showed a significantly smaller weight of automixed silicone material than the other groups (p<0.05), while SR-Ivocap and Success showed similar adaptation accuracy to the compressionmolding denture. The correlationship between the magnitude of the posterior border gap and the weight of the silicone impression materials was affected by either the material or mixing variables.

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Section: Discussionmentioning

confidence: 84%

Comparative adaptation accuracy of acrylic denture bases evaluated by two different methods

et al. 2010

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“…Information on this parameter is important for clinical application of a denture base material and all results satisfied the criteria in ISO 1567 for denture base resins, which specify that the mean breaking force of acrylic resin should not be less than 55 N. 32 Previous studies have shown similar results for the control groups of both acrylic resins. Machado et al 7 observed a mean flexural strength of 116 13 MPa for heat-polymerized PMMA denture base, and Ganzarolli et al 33 observed 97.55 MPa for microwave-polymerized PMMA resin. To our knowledge, no previous published report has studied acrylamide addition to PMMA denture base resins.…”

Section: Discussionmentioning

confidence: 99%

Influence of acrylamide monomer addition to the acrylic denture-base resins on mechanical and physical properties

Ayaz

Durkan

2013

Int J Oral Sci

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The aim of the study was to evaluate the effect of adding acrylamide monomer (AAm) on the characterization, flexural strength, flexural modulus and thermal degradation temperature of poly(methyl methacrylate) (PMMA) denture-base resins. Specimens (n=10) were fabricated from a conventional heat-activated QC-20 (Qc-) and a microwave heat-activated Acron MC (Ac-) PMMA resins. Powder/liquid ratio followed the manufacturer's instructions for the control groups (Qc-c and Ac-c) and for the copolymer groups, the resins were prepared with 5% (−5), 10% (−10), 15% (−15) and 20% (−20) acrylamide contents, according to the molecular weight ratio, respectively. The flexural strength and flexural modulus were measured by a three-point bending test. The data obtained were statistically analyzed by Kruskal–Wallis test (α=0.05) to determine significant differences between the groups. The chemical structures of the resins were characterized by the nuclear magnetic resonance spectroscopy. Thermal stabilities were determined by thermogravimetric analysis (TGA) with a heating rate of 10 °C⋅min−1 from 35 °C to 600 °C. Control groups from both acrylic resins showed the lowest flexural strength values. Qc-15 showed significant increase in the flexural strength when compared to Qc-c (P<0.01). Ac-10 and Ac-15 showed significance when compared to Ac-c (P<0.01). Acrylamide incorporation increased the elastic modulus in Qc-10, Qc-15 and Qc-20 when compared to Qc-c (P<0.01). Also significant increase was observed in Ac-10, Ac-15 and Ac-20 copolymer groups when compared to Ac-c (P<0.01). According to the 1H-nuclear magnetic resonance (NMR) results, acrylamide copolymerization was confirmed in the experimental groups. TGA results showed that the thermal stability of PMMA is increased by the insertion of AAm.

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“…Tridimensional distortion of the denture bases was measured by the method of weighing a silicone rubber film reproducing the gap between resin base and metallic master cast 14. A standardized portion of flow type vinyl polysiloxane (3M ESPE Express, St. Paul, USA) was prepared and coated the internal surface of each resin base, which was repositioned over the master cast and kept in place under an axial load of 40 N. The resulting vinyl polysiloxane film was trimmed at the borderline mark of the master cast and weighed using a precision balance (Mettler Toledo, model AG204, Switzerland) (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Cumulative effect of disinfection procedures on microhardness and tridimensional stability of a poly(methyl methacrylate) denture base resin

et al. 2007

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Microwave irradiation has been used for disinfection of dentures instead of chemical solutions; yet, its effect on resin properties after repeated procedures still is unclear. This study evaluated the cumulative effect of two disinfection methods on Knoop microhardness and tridimensional stability of a poly(methyl methacrylate) denture base resin. For the microhardness measurement, 24-resin discs received mechanical polishing and were submitted to the following treatments: (1) control (no disinfection), (2) chemical disinfection (immersion in 100ppm chloride solution for 24h), or (3) microwave disinfection (irradiation at 690 W for 6 min). Disinfection procedures were performed twice (T1, T2) with a 7-day interval. Knoop microhardness was recorded after polishing (T0) and after T1 and T2. For the dimensional stability test (measured by the adaptation of the denture bases), 36-maxillary denture bases were obtained from type III dental stone casts duplicated from a metallic master model and submitted to the disinfection treatment. Adaptation of denture bases was measured at baseline (T0) and after T1 and T2 by weighing a vinyl polysiloxane film reproducing the gap between resin base and master model. Data were analyzed by ANOVA GLM for repeated measures and Bonferroni's test, alpha = 0.05. Knoop microhardness was not modified by any disinfection procedure but decreased over time. Denture resin bases submitted to microwave disinfection had gradual increase of distortion over time, while bases immersed in chloride solution did not differ from the control group and remained dimensionally stable from T1 to T2.

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Internal adaptation and some physical properties of methacrylate‐based denture base resins polymerized by different techniques

Cited by 35 publications

References 63 publications

Comparative adaptation accuracy of acrylic denture bases evaluated by two different methods

Comparative adaptation accuracy of acrylic denture bases evaluated by two different methods

Influence of acrylamide monomer addition to the acrylic denture-base resins on mechanical and physical properties

Cumulative effect of disinfection procedures on microhardness and tridimensional stability of a poly(methyl methacrylate) denture base resin

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