Degree of conversion of bis-acrylic based provisional crown and fixed partial denture materials

Kim, Sunghun; Watts, D.C.

doi:10.4047/jkap.2008.46.6.639

Cited by 16 publications

(12 citation statements)

References 26 publications

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“…The increased conversion rate in Tx methacrylates is consistent with the influence of ethanol on dimethacrylates [51]; however, dimethacrylates generally have lower conversion rates and the higher their composition, the lower the DC of the resulting polymer. The speedy curing rates observed in ED and EG liquid photopolymer resins (FIGURE 6) also correlate with their lower DC [7].…”

Section: Discussionmentioning

confidence: 75%

“…Preliminary degree of conversion (DC I) was quantified to provide information on unreacted carbon-carbon (C= C) double bond in photocured methacrylates (FIGURE 5). DC (%) was calculated based on the ratio of variable absorbance of aliphatic double bond (peaks at 1637 cm -1 ) against internal standard, which is constant absorbance of aromatic double bond (peaks at 1608 cm -1 ) (peaks at 1608 cm -1 ) [7] as shown in the formula below:…”

Section: Resultsmentioning

confidence: 99%

“…For acrylic devices, there is a propensity for them to accumulate residual monomer and degradation products that can cause local and systemic side effects in high doses [4][5][6]. To put this in context, intraoral devices can cause cytotoxic effects on pulp and oral mucosa, and inhibit protein synthesis of the oral epithelial cells [7]. Also, apart from the medical applications of acrylic esters, their widespread use in the production of plastics for food packaging, surface coatings and emulsion polymers also raises questions pertinent to their toxicological properties, and their short-and long-term health effects (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Toxicological assessment of additively manufactured methacrylates for medical devices in dentistry

et al. 2018

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This study is timely and relevant since there is limited published literature that precisely describes the toxicological properties of additively manufactured methacrylates despite their increased popularity for medical devices. While it is generally accepted that the zebrafish excels as a model system for developmental toxicity, a further examination of its utility in this study using different protocols provides basis for its consideration and adoption at a crucial time when there is a lack of consensus regarding the most suited biological assessment methods for medical devices.

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Section: Discussionmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toxicological assessment of additively manufactured methacrylates for medical devices in dentistry

et al. 2018

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“…to another carbon and an unpaired electron (Kim and Watts, 2008). As polymerization progresses, the amount of aliphatic double bonds decreases but in practice, the process does not guarantee a 100% monomer conversion rate (Duray et al, 1997).…”

Section: Biocompatibility Of Acrylic-based Medical Devices In 3d Prinmentioning

confidence: 99%

Biomedical photopolymers in 3D printing

Alifui‐Segbaya

2019

RPJ

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Purpose Three-dimensional printing of acrylic-based medical devices is projected to grow exponentially despite the limitations of photopolymerization and the lack of information on the clinical performance of the materials. The purpose of this paper is to address an issue of critical importance in the translation of the three-dimensionally printed structures to the clinic, which is assessing the toxicity of the polymers and their precursors. Design/methodology/approach This review highlights the different manufacturing processes, challenges and novel experimental work including the zebrafish embryo model, which offers a potential method for toxicity profiling of biomedical photopolymers and their precursors due to its high genetic similarity to humans. Findings Materials information and experimental data available so far suggest that there is a need for regular and rigorous evaluation of new materials to establish their safety and protect users engaging in biomedically-related printing activities. Originality/value The review identifies stringent, contemporary and cost-effective analytical methods for assessing the safety of biomedical photopolymers and their precursors.

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“…Some of these investigations covered selected mechanical properties. [ 1–14 ] Others have studied monomer conversion,[ 15 ] microstructures,[ 16 ] marginal adaptation,[ 17 ], color stability,[ 17 , 18 ] surface roughness [ 19 ], etc. Although these mechanical, esthetic and other properties are extremely important, the clinical performance of provisional materials also depends on their dimensional and functional durability under stress during mastication.…”

Section: Introductionmentioning

confidence: 99%

Elastic, viscoelastic and viscoplastic contributions to compliance during deformation under stress in prosthodontic temporization materials

Vaidyanathan

Arghavani

2016

Acta Biomaterialia Odontologica Scandinavica

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Purpose: The goal of this investigation was to characterize the compliance properties in selected polymers used for temporary (provisional crown and bridge) applications. Method: Polymethyl methacrylate (PMMA)- and polyethyl methacrylate (PEMA)-based JET and TRIM II were investigated along with two bisacryl composite resins (LUXATEMP and PROTEMP 3 GARANT). Rectangular samples of the resins were subjected to creep–recovery tests in a dynamic mechanical analyzer at and near the oral temperature (27 °C, 37 °C and 47 °C). The instantaneous (elastic), and time-dependent viscoelastic, and viscoplastic compliance profiles of the materials were determined and analyzed as a function of materials and temperature. Results: Highly significant (p = 0.0001) differences among means of elastic, viscoelastic and viscoplastic compliance values were found as a function of materials. TRIM II showed an order of magnitude higher viscoplastic deformation than the other three materials (LUXATEMP, PROTEMP 3 GARANT and JET). Conclusions: The results indicate that PEMA is susceptible to significantly greater elastic, viscoelastic, and more importantly to viscoplastic compliant behavior compared with bisacryl composite and PMMA provisional crown and bridge materials. This indicates high-dimensional instability and poor stiffness and resiliency in PEMA appliances vis-à-vis those of PMMA and bisacryl composites.

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Degree of conversion of bis-acrylic based provisional crown and fixed partial denture materials

Cited by 16 publications

References 26 publications

Toxicological assessment of additively manufactured methacrylates for medical devices in dentistry

Toxicological assessment of additively manufactured methacrylates for medical devices in dentistry

Biomedical photopolymers in 3D printing

Elastic, viscoelastic and viscoplastic contributions to compliance during deformation under stress in prosthodontic temporization materials

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