Effect of high-pressure polymerization on mechanical properties of PMMA denture base resin

Murakami, Natsuko; Wakabayashi, Noriyuki; Matsushima, Rie; Kishida, Akio; Igarashi, Yoshimasa

doi:10.1016/j.jmbbm.2012.12.011

Cited by 92 publications

(88 citation statements)

References 26 publications

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“…Besides the procedural advantages, digitally fabricated dentures are also hypothesised to have enhanced material-specific properties [1–5], because the denture base is milled from poly(methyl methacrylate) (PMMA) pucks that have been polymerised under high temperature and pressure [4]. The high pressure promotes the formation of longer polymer chains [6] and therefore leads to a higher degree of monomer conversion with lower values of residual monomer.…”

Section: Introductionmentioning

confidence: 99%

“…Since the amount of released monomer is proportional to the concentration of residual monomer within the resin [8, 17], different approaches for increasing the degree of conversion and thereby reducing the residual monomer content of denture base resins have been followed. Although different curing methods have been shown to lead to similar degrees of conversion in heat-polymerised resins [16], the application of higher pressure [6] or extended processing time [8] for polymerisation seem to be effective in enhancing the degree of monomer conversion. Another effective approach to reducing the residual monomer content is water bath post-polymerisation treatment [18].…”

Section: Introductionmentioning

confidence: 99%

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Do CAD/CAM dentures really release less monomer than conventional dentures?

et al. 2016

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ObjectivesComputer-aided design (CAD)/computer-aided manufacturing (CAM) dentures are assumed to have more favourable material properties than conventionally fabricated dentures, among them a lower methacrylate monomer release. The aim of this study was to test this hypothesis.Materials and methodsCAD/CAM dentures were generated from ten different master casts by using four different CAD/CAM systems. Conventional, heat-polymerised dentures served as control group. Denture weight and volume were measured; the density was calculated, and the denture surface area was assessed digitally. The monomer release after 7 days of water storage was measured by high-performance liquid chromatography.ResultsWhole You Nexteeth and Wieland Digital Dentures had significantly lower mean volume and weight than conventional dentures. Baltic Denture System and Whole You Nexteeth had a significantly increased density. Baltic Denture System had a significantly smaller surface area. None of the CAD/CAM dentures released significantly less monomer than the control group.ConclusionsAll tested dentures released very low amounts of methacrylate monomer, but not significantly less than conventional dentures. A statistically significant difference might nevertheless exist in comparison to other, less recommendable denture base materials, such as the frequently used autopolymerising resins.Clinical relevanceCAD/CAM denture fabrication has numerous advantages. It enables the fabrication of dentures with lower resin volume and lower denture weight. Both could increase the patient comfort. Dentures with higher density might exhibit more favourable mechanical properties. The hypothesis that CAD/CAM dentures release less monomer than conventional dentures could, however, not be verified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Do CAD/CAM dentures really release less monomer than conventional dentures?

et al. 2016

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“…Self-curing acrylic resins, which are polymerized by mixing polymer powder and monomer liquid at room temperature 3) . They are widely used in provisional prosthesis, temporary prosthetic base materials, repairing dentures and orthodontic removable appliances due to its desirable and handling characteristics: low cost, easy handling and processing, easy to polish and repair, and excellent esthetics and biocompatibility in the oral environment 4,5) . However, PMMA have some disadvantages such as insufficient surface hardness, low flexural strength 6) and poor antibacterial activity 7) , the last is the common cause of caries of abutment and denture stomatitis 8) .…”

Section: Introductionmentioning

confidence: 99%

Antibacterial activity, cytotoxicity and mechanical behavior of nano-enhanced denture base resin with different kinds of inorganic antibacterial agents

Chen

Han

Huang

et al. 2017

Dental Materials Journal

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Silanized aluminum borate whiskers (ABWs) of 4 wt%, silanized zirconium dioxide nanoparticles (nano-ZrO2) of 2 wt% were mixed with polymethyl methacrylate (PMMA) powder to get ZrO2-ABWs/PMMA composites. Titanium dioxide (TiO2), silver-supported titanium dioxide (Ag/TiO2), silver-supported zirconium phosphate (Novaron) and tetrapod-like zinc oxide whiskers (T-ZnOw) antibacterial agents of 3 wt% were mixed with ZrO2-ABWs/PMMA composites respectively to fabricate standard specimens. Plaque biofilms on the specimens surface were investigated for colony-forming units (CFUs). In addition, cytotoxicity and mechanical behavior were evaluated. Results showed that the CFUs values of S. mutans and C. albican biofilms on the four antibacterial composites surface were all reduced (p<0.05) compared to the blank and control groups. The antibacterial composites did not have an adverse effect on fibroblast growth in this study (p>0.05) except TiO2 and Ag/TiO2 groups of undiluted extracts. The flexural strength and surface hardness of Novaron and T-ZnOw groups were increased (p<0.05) compared to the control group.

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“…The powder includes a prepolymerized PMMA, an initiator that catalyzes the polymerization process and a radiopacifier. Thus, the resin previously prepared at the surgery spot is used as filler for bone cavities and skull defects and also for dental implants and vertebrae stabilization in osteoporosis patients [3]. In [3 -6], more specific applications of PMMA as bone cement are described However, the PMMA has a strong potential for direct fabrication of prosthesis by rapid prototyping.…”

Section: Introductionmentioning

confidence: 99%

“…Although the properties and characteristics of the PMMA powder to be used for the construction of prosthesis via RP have not yet been standardized, it is known that the polymer must have a high molecular weight in order to achieve the appropriate mechanic properties that are comparable to those of the human body. In general, physical chemistry properties of the PMMA powder used in bone cement include: particle diameter less than 125 µm; molecular weight from (60,000 to 1'000,000 g/mol); density of 1.18 g/cm 3 , melting temperature of 160 °C and glass transition of 105 °C [10 -12]. Because of its availability and flexibility in operation, the industrial production of PMMA is widely managed through batch polymerization [13 -16].…”

Section: Introductionmentioning

confidence: 99%

Cytotoxicity Assessment of a Poly(methyl methacrylate) Synthesized for the Direct Fabrication of Bone Tissues

Liñan

Lima

Benatti

et al. 2018

Braz. arch. biol. technol.

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A cytotoxicity study is performed on a poly(methyl methacrylate) polymer (PMMA) to be used for the fabrication of bone tissue by Rapid Prototyping (RP). The solution polymerization is conducted in a pilot plant reactor using more appropriated reagents in consideration of the medical application. Moreover, the polymer is efficiently handled to avoid the side effect of the monomer, reducing the concentration of this specie to 287,731 µg MMA/kg PMMA. The cytotoxicity of the polymer is determined through growth monitoring, adherence and morphology of L-929 cells. Additionally, MTT and LIVE/DEAD tests are performed. The results showed continuous and progressive growth of the cells on the surface of the specimens. Moreover, the material did not influence on the viability of mesenchymal cells and inverted fluorescence microscopy images showed a polyanionic dye calcein well retained in the cells in contact with the PMMA as well as the negative control after 72 hours. Thus, the polymer was efficiently synthesized and handled for the expected demands.

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Effect of high-pressure polymerization on mechanical properties of PMMA denture base resin

Cited by 92 publications

References 26 publications

Do CAD/CAM dentures really release less monomer than conventional dentures?

Do CAD/CAM dentures really release less monomer than conventional dentures?

Antibacterial activity, cytotoxicity and mechanical behavior of nano-enhanced denture base resin with different kinds of inorganic antibacterial agents

Cytotoxicity Assessment of a Poly(methyl methacrylate) Synthesized for the Direct Fabrication of Bone Tissues

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