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The effect of acrylamide incorporation on the thermal and physical properties of denture resins.

Aydogan Ayaz E, Durkan R, Bagis B - J Adv Prosthodont (2013)

Bottom Line: The results were tested regarding the normality of distribution with the Shapiro Wilk test.The 10%, 15% and 20% copolymer groups of Stellon presented significantly higher than the control group in terms of hardness. 15% and 20% copolymer groups of Acron MC showed significantly higher hardness values when compared to the control group of the resin.Acrylamide addition did not affect the hardness of the QC-20 resin significantly.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.

ABSTRACT

Purpose: Polymethyl methacrylate (PMMA) is the most commonly used denture base material despite typically low in strength. The purpose of this study was to improve the physical properties of the PMMA based denture base resins (QC-20, Dentsply Ltd., Addlestone, UK; Stellon, AD International Ltd, Dentsply, Switzerland; Acron MC; GC Lab Technologies Inc., Alsip, Japan) by copolymerization mechanism.

Materials and methods: Control group specimens were prepared according to the manufacturer recommendations. In the copolymer groups; resins were prepared with 5%, 10%, 15% and 20% acrylamide (AAm) (Merck, Hohenbrunn, Germany) content according to the moleculer weight ratio, respectively. Chemical structure was characterized by a Bruker Vertex-70 Fourier transform infrared spectroscopy (FTIR) (Bruker Optics Inc., Ettlingen, Germany). Hardness was determined using an universal hardness tester (Struers Duramin, Struers A/S, Ballerup, Denmark) equipped with a Vickers diamond penetrator. The glass transition temperature (Tg) of control and copolymers were evaluated by Perkin Elmer Diamond DSC (Perkin Elmer, Massachusetts,USA). Statistical analyses were carried out using the statistical package SPSS for Windows, version 15.0 (SPSS, Chicago, IL, USA). The results were tested regarding the normality of distribution with the Shapiro Wilk test. Data were analyzed using ANOVA with post-hoc Tukey test (P<.01).

Results: The copolymer synthesis was confirmed by FTIR spectroscopy. Glass transition temperature of the copolymer groups were higher than the control groups of the resins. The 10%, 15% and 20% copolymer groups of Stellon presented significantly higher than the control group in terms of hardness. 15% and 20% copolymer groups of Acron MC showed significantly higher hardness values when compared to the control group of the resin. Acrylamide addition did not affect the hardness of the QC-20 resin significantly.

Conclusion: Within the limitation of this study, it can be concluded that copolymerization of PMMA with AAm increased the hardness value and glass transition temperature of PMMA denture base resins.

No MeSH data available.


Related in: MedlinePlus

FTIR spectra of Acron MC control and Acron MC-AAm copolymers. 'a' and 'c' show the C-H, 'b' shows the C=O and 'd' shows the O-C-C bonds of MMA which are observed in both control and copolymer of the resins. The line symbol indicates the NH2 peaks of acrylamide in the copolymer groups.
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Figure 3: FTIR spectra of Acron MC control and Acron MC-AAm copolymers. 'a' and 'c' show the C-H, 'b' shows the C=O and 'd' shows the O-C-C bonds of MMA which are observed in both control and copolymer of the resins. The line symbol indicates the NH2 peaks of acrylamide in the copolymer groups.

Mentions: The copolymer synthesis was confirmed by FTIR spectroscopy, and the first group of QC control and QC-Acrylamide copolymers is shown in Fig. 1. In the FTIR spectr um of QC-C, a strong -C=O stretching was observed at 1720 cm-1 and the -C-O stretching vibrations of esters (C-C(=O) -O and O-C-C) were observed at in the range of 1249-1064 cm-1. Methyl and methylene -C-H stretchings were observed at approximately 2954 cm-1, whereas -C-H bendings of the same groups appeared at 1458 cm-1. In the FTIR spectra of copolymers with various molar percentages of acrylamide (AAm), the same vibrations were identified corresponding to the methyl methacrylate (MMA) units. Additionally, the wide peak at 3417 cm-1 can be ascribed to N-H stretchings. Fig. 2 reveals the characteristic absorption bands of both the MMA and AAm groups of Stellon resins. The -C-H stretching and bending vibrations appeared at 2947 and 1442 cm-1, respectively. The -C=O groups and ester groups appeared at 1720 and 1242-1056 cm-1. The methyl rocking vibrations are observed at 979 cm-1. Again, a broad band at approximately 3332 cm-1 was assigned to N-H stretchings. Similarly to Fig. 1 and Fig. 2, PMMA and PAAm characteristic groups can be observed in the FTIR spectra of the Acron MC groups in Fig. 3.


The effect of acrylamide incorporation on the thermal and physical properties of denture resins.

Aydogan Ayaz E, Durkan R, Bagis B - J Adv Prosthodont (2013)

FTIR spectra of Acron MC control and Acron MC-AAm copolymers. 'a' and 'c' show the C-H, 'b' shows the C=O and 'd' shows the O-C-C bonds of MMA which are observed in both control and copolymer of the resins. The line symbol indicates the NH2 peaks of acrylamide in the copolymer groups.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3675282&req=5

Figure 3: FTIR spectra of Acron MC control and Acron MC-AAm copolymers. 'a' and 'c' show the C-H, 'b' shows the C=O and 'd' shows the O-C-C bonds of MMA which are observed in both control and copolymer of the resins. The line symbol indicates the NH2 peaks of acrylamide in the copolymer groups.
Mentions: The copolymer synthesis was confirmed by FTIR spectroscopy, and the first group of QC control and QC-Acrylamide copolymers is shown in Fig. 1. In the FTIR spectr um of QC-C, a strong -C=O stretching was observed at 1720 cm-1 and the -C-O stretching vibrations of esters (C-C(=O) -O and O-C-C) were observed at in the range of 1249-1064 cm-1. Methyl and methylene -C-H stretchings were observed at approximately 2954 cm-1, whereas -C-H bendings of the same groups appeared at 1458 cm-1. In the FTIR spectra of copolymers with various molar percentages of acrylamide (AAm), the same vibrations were identified corresponding to the methyl methacrylate (MMA) units. Additionally, the wide peak at 3417 cm-1 can be ascribed to N-H stretchings. Fig. 2 reveals the characteristic absorption bands of both the MMA and AAm groups of Stellon resins. The -C-H stretching and bending vibrations appeared at 2947 and 1442 cm-1, respectively. The -C=O groups and ester groups appeared at 1720 and 1242-1056 cm-1. The methyl rocking vibrations are observed at 979 cm-1. Again, a broad band at approximately 3332 cm-1 was assigned to N-H stretchings. Similarly to Fig. 1 and Fig. 2, PMMA and PAAm characteristic groups can be observed in the FTIR spectra of the Acron MC groups in Fig. 3.

Bottom Line: The results were tested regarding the normality of distribution with the Shapiro Wilk test.The 10%, 15% and 20% copolymer groups of Stellon presented significantly higher than the control group in terms of hardness. 15% and 20% copolymer groups of Acron MC showed significantly higher hardness values when compared to the control group of the resin.Acrylamide addition did not affect the hardness of the QC-20 resin significantly.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.

ABSTRACT

Purpose: Polymethyl methacrylate (PMMA) is the most commonly used denture base material despite typically low in strength. The purpose of this study was to improve the physical properties of the PMMA based denture base resins (QC-20, Dentsply Ltd., Addlestone, UK; Stellon, AD International Ltd, Dentsply, Switzerland; Acron MC; GC Lab Technologies Inc., Alsip, Japan) by copolymerization mechanism.

Materials and methods: Control group specimens were prepared according to the manufacturer recommendations. In the copolymer groups; resins were prepared with 5%, 10%, 15% and 20% acrylamide (AAm) (Merck, Hohenbrunn, Germany) content according to the moleculer weight ratio, respectively. Chemical structure was characterized by a Bruker Vertex-70 Fourier transform infrared spectroscopy (FTIR) (Bruker Optics Inc., Ettlingen, Germany). Hardness was determined using an universal hardness tester (Struers Duramin, Struers A/S, Ballerup, Denmark) equipped with a Vickers diamond penetrator. The glass transition temperature (Tg) of control and copolymers were evaluated by Perkin Elmer Diamond DSC (Perkin Elmer, Massachusetts,USA). Statistical analyses were carried out using the statistical package SPSS for Windows, version 15.0 (SPSS, Chicago, IL, USA). The results were tested regarding the normality of distribution with the Shapiro Wilk test. Data were analyzed using ANOVA with post-hoc Tukey test (P<.01).

Results: The copolymer synthesis was confirmed by FTIR spectroscopy. Glass transition temperature of the copolymer groups were higher than the control groups of the resins. The 10%, 15% and 20% copolymer groups of Stellon presented significantly higher than the control group in terms of hardness. 15% and 20% copolymer groups of Acron MC showed significantly higher hardness values when compared to the control group of the resin. Acrylamide addition did not affect the hardness of the QC-20 resin significantly.

Conclusion: Within the limitation of this study, it can be concluded that copolymerization of PMMA with AAm increased the hardness value and glass transition temperature of PMMA denture base resins.

No MeSH data available.


Related in: MedlinePlus