scholarly journals A GAS CHROMATOGRAPHY STUDY ON THE EFFECT OF TWO DIFFERENT CURING CYCLES ON THE RESIDUAL MONOMER CONTENT OF TWO DIFFERENT HEAT CURE DENTURE BASE RESINS.

2020 ◽  
pp. 4-6
Author(s):  
Joy PT ◽  
Bennett Atlin Correya ◽  
V. K Zahida ◽  
Gilsa K. Vasunni ◽  
Julie George Alapatt
Keyword(s):  
Mechanical Properties ◽  
Gas Chromatography ◽  
Allergic Reactions ◽  
Residual Monomer ◽  
Chromatography Method ◽  
Denture Base ◽  
Heat Cure ◽  
Monomer Content ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

The conversion of monomer to polymer is not complete in denture base resins and residual monomer left can cause mucosal irritation, inflammation, and allergic reactions in tissues adjacent to dentures. The mechanical properties of denture base resins have been found to be lacking with increased residual monomer content. Therefore, it is desirable to reduce the residual monomer content in the processed denture. In the present study Gas chromatography method was used to determine the levels of residual methyl methacrylate monomer of two different brands of heat cure denture base resins processed by two different polymerization cycles. The study concluded that while processing the denture sufficient length of boiling phase should be given and for each brand, manufacturer’s instructions should be strictly followed while selecting polymerization cycle.

scholarly journals EFFECT OF POST CURE TREATMENTS ON RESIDUAL MONOMER CONTENT OF TWO COMMERCIALLY AVAILABLE HEAT CURE DENTURE BASE RESINS. AN IN-VITRO STUDY

2020 ◽  
pp. 29-33
Author(s):  
Joy PT ◽  
Mehul R Mahesh ◽  
V.K Zahida ◽  
Gilsa K. Vasunni ◽  
Lylajam S
Keyword(s):  
Gas Chromatography ◽  
Room Temperature ◽  
Water Immersion ◽  
In Vitro Study ◽  
Residual Monomer ◽  
Denture Base ◽  
Heat Cure ◽  
Monomer Content ◽  
Curing Cycle

The presence of Residual monomer content in processed dentures is not desirable. Different methods are used for reducing the residual monomer content after processing. In the present study the effects of two post cure treatments (water immersion and additional curing cycle) on the residual monomer content of two commonly used denture base resins (Acralyn H and Trevalon Hi) were evaluated by using gas chromatography. Study concluded that both water immersion for one day at room temperature and additional curing cycle reduced the residual monomer content in both brands which was initially high after processing.

scholarly journals Effects of Monomer Composition of Urethane Methacrylate Based Resins on the C=C Degree of Conversion, Residual Monomer Content and Mechanical Properties

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4415
Author(s):  
Codruta Sarosi ◽  
Marioara Moldovan ◽  
Andrada Soanca ◽  
Alexandra Roman ◽  
Timea Gherman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Degree Of Conversion ◽  
Chain Growth ◽  
Structure Property ◽  
Residual Monomer ◽  
Radical Chain ◽  
Dental Resins ◽  
Monomer Content

(1) Background: This study investigated the influence of Bis-GMA, TEGDMA, UDMA, and two different polyethylene glycol (PEG)-containing, UDMO-based co-monomers on the Young’s modulus and flexural strength, degree of methacrylate C=C double bond conversion and residual monomer elution of experimental dental resins. (2) Methods: Urethane methacrylate-based monomer was synthesised via a radical chain growth polymerization mechanism using PEG in order to improve the mechanical properties. Dental resins were formulated using Bis-GMA, UDMA, or UDMO as base monomers combined with TEGDMA as a dilution monomer and DMAEM + CQ as the photo-initiator system. Degree of conversion (DC), mechanical properties, and residual monomer content of light-activated methacrylate resin formulations were evaluated and statistically analysed by ANOVA and a Tukey’s test. (3) Results: PEG-containing UDMO resins had lower Young’s modulus and elastic strength than UDMA-derived resin for all irradiation times. The highest DC (67,418%) was observed for the PEG-containing UDMO-based resin formulation when light cured for 40 s. For all samples, DC increased with the photo-polymerization time. The amount of residual monomer decreased after increasing the light-curing period from 20 to 40 s, resin with UDMO content 0.01 mol of PEG having the smallest amount of free eluted monomer. (4) Conclusions: A strong structure–property relationship exists in photo-cured dimethacrylate-based dental resins. The time and quantity of the photochemical initiation system can influence the physical–mechanical properties of the resins but also the monomers in their composition.

scholarly journals Residual monomer content determination in some acrylic denture base materials and possibilities of its reduction

2009 ◽  
Vol 66 (3) ◽  
pp. 223-227 ◽  
Author(s):  
Milena Kostic ◽  
Nebojsa Krunic ◽  
Ljubisa Nikolic ◽  
Vesna Nikolic ◽  
Stevo Najman ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Steam Bath ◽  
Polymerization Process ◽  
Tolerance Range ◽  
Residual Monomer ◽  
Denture Base ◽  
Base Materials ◽  
Acrylic Resins ◽  
Monomer Content ◽  
Reduction Methods

Background/Aim. Polymethyl methacrylate is used for producing a denture basis. It is a material made by the polymerization process of methyl methacrylate. Despite of the polymerization type, there is a certain amount of free methyl methacrylate (residual monomer) incorporated in the denture, which can cause irritation of the oral mucosa. The aim of this study was to determine the amount of residual monomer in four different denture base acrylic resins by liquid chromatography and the possibility of its reduction. Methods. After the polymerization, a postpolymerization treatment was performed in three different ways: in boiling water for thirty minutes, with 500 W microwaves for three minutes and in steam bath at 22? C for one to thirty days. Results. The obtained results showed that the amount of residual monomer is significantly higher in cold polymerizing acrylates (9.1-11%). The amount of residual monomer after hot polymerization was in the tolerance range (0.59- 0.86%). Conclusion. The obtained results denote a low content of residual monomer in the samples which have undergone postpolymerization treatment. A lower percent of residual monomer is established in samples undergone a hot polymerization.

scholarly journals Effect of nano silica coating concentration on reducing acrylic resin denture cytotoxicity

2020 ◽  
Vol 5 (3) ◽  
pp. 126
Author(s):  
Gene Rizky Natalia Gunawan ◽  
Titik Ismiyati ◽  
Haryo Mustiko Dipoyono
Keyword(s):  
Cell Viability ◽  
Base Material ◽  
Acrylic Resin ◽  
Silica Coating ◽  
Control Group ◽  
Nano Silica ◽  
Residual Monomer ◽  
Denture Base ◽  
Significant Difference ◽  
Monomer Content

Acrylic resin is a denture base material mostly used in the fabrication of removable partial denture and complete denture because it is easy to process, economical and aesthetically satisfying. However, the acrylic resin has a weakness i.e. residual monomer content which causes cytotoxic effect to human cells. Nano-silica coating could be used on the acrylic resin to reduce residual monomer content. The purpose of this study was to determine the effect of nano-silica coating concentration on the cytotoxicity of acrylic resin denture base material. Twenty-four acrylic resin disc-shaped specimens (5 mm in diameter and 2 mm in thickness) were divided into 4 groups (n=6), i.e. control, group with application of 0.5%,1%, and 2% nano silica coating. The specimens on the silica coating groups were silica coated using dip-coating method. After the coating was completed, the specimens were added into cell fibroblast culture (vero cell line). Cytotoxicity testswere done by MTT assay. The optical density was measured using ELISA plate reader to determine the percentage of cell viability. The highest mean of cell viability was shown in 0.5% concentration (96.78 ± 1.71) and the lowest mean was shown in the control group (80.32 ± 6.53). One-way ANOVA showed that there were significant differences among these groups. LSD tests showed that there was significant difference among all of the groups. This study concluded that nano silica coating concentration has a significant effect on the cytotoxicity of acrylic resin denture base materials.

scholarly journals Antibacterial activity and effects of aromatic derivatives on denture base polymerization.

2019 ◽  
Vol S (1) ◽  
pp. 24-27
Author(s):  
Ammar AG. Alhamdani ◽  
◽  
Arjwan M. Shuker ◽  
Inas A. Jawad ◽  
◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Oral Cavity ◽  
Polymerization Process ◽  
Negative Effects ◽  
Denture Base ◽  
Plant Extraction ◽  
Methacrylate Monomer ◽  
Methyl Methacrylate Monomer

This study assessed the effect of copolymerization on the microbiota of the oral cavity. The plant extraction was converted into aromatic derivatives, which were added to methyl methacrylate monomer. Fourier transform infrared spectroscopy spectra showed no negative effects of these additives on the polymerization process. All the assayed derivatives displayed some degree of antibacterial activity.

scholarly journals Aplicabilidade dos sistemas CAD/CAM em Prótese Total: revisão de literatura

2019 ◽  
Vol 7 (11) ◽  
Author(s):  
Caroline Costa Tavares ◽  
Julliana Cariry Palhano Freire ◽  
Stéphanie Cariry Palhano Freire ◽  
Eduardo Dias-Ribeiro ◽  
André Ulisses Dantas Batista
Keyword(s):  
Mechanical Properties ◽  
Complete Denture ◽  
Complete Dentures ◽  
Residual Monomer ◽  
Denture Base ◽  
Base Materials ◽  
Removable Denture ◽  
Computer Aided ◽  
Cad Cam ◽  
Dent Assoc

Introdução: A tecnologia CAD/CAM possui múltiplas aplicações protéticas, incluindo a prótese total. Objetivos: realizar uma revisão de literatura sobre a aplicabilidade dos sistemas CAD/CAM na fabricação de próteses totais, a fim de elucidar as propriedades das próteses confeccionadas através dessa tecnologia e as características desse sistema. Metodologia: A busca por artigos científicos que contemplassem o tema foi realizada através das bases de dados PUBMED e SCIELO, sem restrição de período. Foi feita a análise dos títulos e resumos e em seguida o acesso ao texto completo. Resultados: Dentre as características do sistema CAD/CAM, os estudos citaram menor necessidade de consultas e tempo clínico. É preciso conhecimento da tecnologia pelo cirurgião-dentista e o maior custo laboratorial é uma das desvantagens de sua utilização. Quanto às propriedades, observa-se a redução da rugosidade e porosidade, assim como da adesão de Candida albicans à base da prótese e teor de monômero residual. Maior dureza de superfície é verificada em comparação com as próteses totais convencionais. Conclusão: Menor número de consultas e tempo clínico são características do uso do sistema CAD/CAM em prótese total. Maior dureza da prótese e redução da rugosidade, porosidade, adesão de C. albicanse do teor de monômero residual são propriedades que as próteses totais apresentam quando confeccionadas por essa tecnologia.Descritores: Odontologia; Prótese Total; Projeto Auxiliado por Computador.ReferênciasAlbero A, Pacual A, Camps I, Grau-Benitez M. Comparative characterization of a novel cad-cam polymer-infiltrated-ceramic-network. J Clin Exp Dent. 2015;7(4):e495-500.Janeva N, Kovacevska G, Janev E. Complete Dentures Fabricated with CAD/CAM Technology and a Traditional Clinical Recording Method. Open Access Macedonian Journal of Medical Sciences. 2017;5(6):785-89.Baba NZ, Alrumaih HS, Goodacre BJ, Goodacre CJ.  Current   techniques  in  CAD/CAM  denture fabrication. Gen Dent. 2016;64(6):23-8.Alamari MR. The influence of polishing techniques on pre-polymerized CAD/CAM acrylic resin denture bases. Electronic Physician. 2017;9(10):5452-58.Steinmassl PA, Klaunzer F, Steinmassi O, Dumfahrt H, Grunert I. Evaluation of Currently Available CAD/CAM Denture Systems. Int J Prosthodont. 2017;30(2):116-22.de Mendonça AF, Furtado de Mendonça M, White GS, Sara G, Littlefair D. Total CAD/CAM Supported Method for Manufacturing Removable Complete Dentures. Case Reports in Dentistry. 2016;2016:1259581.Mclaughlin JB, Ramos VJr. Complete denture fabrication with CAD/CAM record bases. J Prosthet Dent. 2015;114(4):493-97.Schweiger J, Guth JF, Edelhoff D, Stumbaum J. Virtual evaluation for CAD-CAM-fabricated complete dentures. J Prosthet Dent. 2017;117(1):28-33.Liu PR, Essig ME. Panorama of dental CAD/CAM restorative systems. Compend Contin Educ Dent. 2008; 29:482, 4, 6-8 passim.Giordano R. Materials for chairside CAD/CAM-produced restorations. J Am Dent Assoc. 2006;137(Suppl):14S-21S.Bilgin MS, Baytaroglu EN, Erdem A, Dilber E. A review of computer-aided design/computer-aided manufacture techniques for removable denture fabrication. European Journal of Dentistry. 2016;10(2):286-91.Maeda Y, Minoura M, Tsutsumi S, Okada M, Nokubi T. A CAD/CAM system for removable denture. Part I: Fabrication of complete dentures. Int J Prosthodont. 1994;7:17–21.Di Giacomo GA, Cury PR, de Araujo NS, Sendyk WR, Sendyk CL. Clinical application of stereolithographic surgical guides for implant placement: Preliminary results. J Periodontol. 2005;76:503–7.Ucar Y, Akova T, Aysan I. Mechanical properties of polyamide versus different PMMA denture base materials. J Prosthodont. 2012;21(3):173–6.Lee HJ, Kim CW, Kim YS. The level of residual monomer in injection molded denture base materials. J Korean Acad Prosth. 2003;41(3):360–8.Kattadiyil MT, Goodacre CJ, Baba NZ. CAD/CAM complete dentures: a review of two commercial fabrication systems. J Calif Dent Assoc. 2013;41(6):407–16.Consani RLX, Pucciarelli MGR, Mesquita MF, Nogueira MC, Barao VA. Polymerisation cycles on hardness and surface gloss of denture base. Int J Contemp Dent Med Rev. 2014;2014:1–6.Nakayama M, Takagi N. Methods for manufacturing dental resin block. US:2016.Murakami N, Wakabayashi N, Matsushima R, Kishida A, Igarashi Y. Effect of high-pressure polymerization on mechanical properties of PMMA denture base resin. J Mech Behav Biomed Mater. 2013;20:98-104.Al-Fouzan AF, Al-Mejarad Lamya A, Albarrag AM. Adherence of Candida to complete denture surfaces in vitro: A comparison of conventional and CAD/CAM complete dentures. J Adv Prosthodont. 2017;9(5):402-8.Digholkar S, Madhav VN, Palaskar J. Evaluation of the flexural strength and microhardness of provisional crown and bridge materials fabricated by different methods. J Indian Prosthodont Soc. 2016;16(4):328-34.Ayman AD. The residual monomer content and mechanical properties of CAD\CAM resins used in the fabrication of complete dentures as compared to heat cured resins. Electron Physician. 2017;9(7):4766-72.

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