scholarly journals Effect of conventional water-bath and experimental microwave polymerization cycles on the flexural properties of denture base acrylic resins

2015 ◽  
Vol 34 (5) ◽  
pp. 623-628 ◽  
Author(s):  
Guilherme Kloster SPARTALIS ◽  
Lucas Kravchychyn CAPPELLETTI ◽  
Amanda Cristina SCHOEFFEL ◽  
Milton Domingos MICHÉL ◽  
Thiago Amadei PEGORARO ◽  
...  
Keyword(s):  
Water Bath ◽  
Flexural Properties ◽  
Denture Base ◽  
Acrylic Resins ◽  
Microwave Polymerization

Effect of Thermal Cycling on Flexural Properties of Microcrystalline Cellulose‐Reinforced Denture Base Acrylic Resins

2019 ◽  
Vol 29 (7) ◽  
pp. 611-616 ◽  
Author(s):  
Amira Ali Abdel Rahaman Ali ◽  
Jacob John ◽  
Shani Ann Mani ◽  
Hesham R. El‐Seedi
Keyword(s):  
Thermal Cycling ◽  
Microcrystalline Cellulose ◽  
Flexural Properties ◽  
Denture Base ◽  
Acrylic Resins

scholarly journals Effect of Thermocycling, Teeth, and Polymerization Methods on Bond Strength Teeth-Denture Base

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Sandra Lúcia Andrade de Freitas ◽  
William Cunha Brandt ◽  
Milton Edson Miranda ◽  
Rafael Pino Vitti
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Water Bath ◽  
Microwave Method ◽  
Denture Base ◽  
Mean Values ◽  
Acrylic Resins ◽  
Artificial Teeth

Objective. To evaluate the shear bond strength between different artificial teeth and denture base polymerized by two polymerization methods submitted to thermocycling. Materials and Methods. Two acrylic resins were selected according to the polymerization method (water-bath and microwave), and four different artificial teeth (Biotone, Dentsply; Trilux, Vipi Dent; Premium 8, Heraeus Kulzer; Soluut PX, Yamahachi) were also tested. The polymerization of the acrylic resin was performed by using conventional cycle (8 h at 74°C) in water-bath and using two cycles (20 min at 270 W + 5 min at 360 W) by the microwave method. The shear bond strength was evaluated after 24 h of water storage at 37°C (immediately) and after the thermocycling test (5,000 cycles, 5–55°C). The shear bond strength (n=10) was performed using a universal testing machine (Instron 4411) at a crosshead speed of 1.0 mm/min. Modes of failures were classified as cohesive and adhesive. The data (MPa) were statistically analyzed by three-way ANOVA, and the mean values were compared by the Tukey test (α = 0.05). Results. In general, the polymerization by microwave showed the highest shear bond strength values, and Trilux artificial teeth had the lowest bond strength values (p<0.05). Thermocycling did not affect the shear bond strength (p<0.05). There was a predominance of cohesive failures for all groups. Conclusions. The chemical composition of the artificial teeth affects the bond strength, and the microwave method is preferable to perform the acrylic resin polymerization.

scholarly journals Allergic effects of the residual monomer used in denture base acrylic resins

2015 ◽  
Vol 09 (04) ◽  
pp. 614-619 ◽  
Author(s):  
Haroon Rashid ◽  
Zeeshan Sheikh ◽  
Fahim Vohra
Keyword(s):  
Polymerization Reaction ◽  
Occupational Hazards ◽  
Residual Monomer ◽  
Denture Base ◽  
Acrylic Resins ◽  
Microwave Polymerization ◽  
Oral Environment ◽  
Removable Appliances ◽  
Harmful Effects ◽  
Local Side

ABSTRACTDenture base resins are extensively used in dentistry for a variety of purposes. These materials can be classified as chemical, heat, light, and microwave polymerization materials depending upon the factor which starts the polymerization reaction. Their applications include use during denture base construction, relining existing dentures, and for fabrication of orthodontic removable appliances. There have been increased concerns regarding the safe clinical application of these materials as their biodegradation in the oral environment leads to harmful effects. Along with local side effects, the materials have certain occupational hazards, and numerous studies can be found in the literature mentioning those. The purpose of this article is to outline the cytotoxic consequences of denture base acrylic resins and clinical recommendations for their use.

scholarly journals Effect of post-polymerization heat treatments on the cytotoxicity of two denture base acrylic resins

2006 ◽  
Vol 14 (3) ◽  
pp. 203-207 ◽  
Author(s):  
Janaina Habib Jorge ◽  
Eunice Teresinha Giampaolo ◽  
Carlos Eduardo Vergani ◽  
Ana Lúcia Machado ◽  
Ana Cláudia Pavarina ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thymidine Incorporation ◽  
Heat Treatments ◽  
In Vitro Cytotoxicity ◽  
Water Bath ◽  
Screening Tests ◽  
Polymerization Process ◽  
Denture Base ◽  
Acrylic Resins

INTRODUCTION: Most denture base acrylic resins have polymethylmethacrylate in their composition. Several authors have discussed the polymerization process involved in converting monomer into polymer because adequate polymerization is a crucial factor in optimizing the physical properties and biocompatibility of denture base acrylic resins. To ensure the safety of these materials, in vitro cytotoxicity assays have been developed as preliminary screening tests to evaluate material biocompatibility. ³H-thymidine incorporation test, which measures the number of cells synthesizing DNA, is one of the biological assays suggested for cytotoxicity testing. AIM: The purpose of this study was to investigate, using ³H-thymidine incorporation test, the effect of microwave and water-bath post-polymerization heat treatments on the cytotoxicity of two denture base acrylic resins. MATERIALS AND METHODS: Nine disc-shaped specimens (10 x 1 mm) of each denture base resin (Lucitone 550 and QC 20) were prepared according to the manufacturers' recommendations and stored in distilled water at 37ºC for 48 h. The specimens were assigned to 3 groups: 1) post-polymerization in a microwave oven for 3 min at 500 W; 2) post-polymerization in water-bath at 55º C for 60 min; and 3) without post-polymerization. For preparation of eluates, 3 discs were placed into a sterile glass vial with 9 mL of Eagle's medium and incubated at 37ºC for 24 h. The cytotoxic effect of the eluates was evaluated by ³H-thymidine incorporation. RESULTS: The results showed that the components leached from the resins were cytotoxic to L929 cells, except for the specimens heat treated in water bath (p<0.05). Compared to the group with no heat treatment, water-bath decreased the cytotoxicity of the denture base acrylic resins. CONCLUSION: The in vitro cytotoxicity of the tested denture base materials was not influenced by microwave post-polymerization heat treatment.

The effect of disinfection procedures on flexural properties of denture base acrylic resins

1992 ◽  
Vol 68 (1) ◽  
pp. 191-195 ◽  
Author(s):  
Tehmina Asad ◽  
Adrian C. Watkinson ◽  
Robin Huggett
Keyword(s):  
Flexural Properties ◽  
Denture Base ◽  
Acrylic Resins

Effect of Interchanging Liquid Components of Two Auto-Polymerizing Orthodontic Acrylic Resins in their Flexural Properties

2014 ◽  
Vol 1025-1026 ◽  
pp. 797-802 ◽  
Author(s):  
Tassanaporn Saen-Isara ◽  
Surachai Dechkunakorn ◽  
Niwat Anuwongnukroh ◽  
Toemsak Srikhirin ◽  
Siriporn Tanodekaew
Keyword(s):  
Setting Time ◽  
Acrylic Resin ◽  
Flexural Properties ◽  
Acrylic Resins

Objective: To evaluate the effects of interchanging the liquid components of two commercially available orthodontic auto-polymerizing acrylic resin in their flexural properties, clarity and setting time

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