scholarly journals Erratum to “Nanopigmented Acrylic Resin Cured Indistinctively by Water Bath or Microwave Energy for Dentures”

2019 ◽  
Vol 2019 ◽  
pp. 1-2
Author(s):  
L. S. Acosta-Torres ◽  
M. C. Arenas-Arrocena ◽  
R. E. Nuñez-Anita ◽  
F. H. Barceló-Santana ◽  
C. A. Álvarez-Gayosso ◽  
...  
Keyword(s):  
Acrylic Resin ◽  
Microwave Energy ◽  
Water Bath

scholarly journals Water sorption of heat-polymerized acrylic resins processed in mono and bimaxillary flasks

2006 ◽  
Vol 17 (2) ◽  
pp. 122-125 ◽  
Author(s):  
Carolina B. Meloto ◽  
Laís R. Silva-Concílio ◽  
Cristiane Machado ◽  
Margarete C. Ribeiro ◽  
Fábio A. Joia ◽  
...  
Keyword(s):  
Water Sorption ◽  
Acrylic Resin ◽  
Microwave Energy ◽  
Water Bath ◽  
Acrylic Resins ◽  
Energy Processing ◽  
Group 3 ◽  
Group 2 ◽  
Student’S T ◽  
Group 1

This study evaluated water sorption in heat-polymerized acrylic resins processed in monomaxillary flasks by water bath and in bimaxillary flasks by microwave energy and water bath. Fifty heat-polymerized acrylic resin specimens were fabricated according to the 12th specification of the American Dental Association and assigned to 3 groups: group 1 was processed by water bath in monomaxillary metallic flask; group 2 was processed by microwave energy in bimaxillary PVC flask; and group 3 was processed by water bath in bimaxillary metallic flask. Specimens were submitted to water sorption test, means were calculated and analyzed statistically by Student's t-test. Means (in g/cm³) were: group 1 - 0.024085, group 2 - 0.025312 and group 3 - 0.022098. Microwave energy processing and the amount of stone and resin used in the bimaxillary PVC flask did not influence water sorption; specimens processed in bimaxillary metallic flask by water bath presented lower water sorption means, suggesting an inadequate polymerization of the acrylic resin mass.

scholarly journals Flexural strength of acrylic resin repairs processed by different methods: water bath, microwave energy and chemical polymerization

2011 ◽  
Vol 19 (3) ◽  
pp. 249-253 ◽  
Author(s):  
João Neudenir Arioli Filho ◽  
Luís Eduardo Butignon ◽  
Rodrigo de Paula Pereira ◽  
Matheus Guilherme Lucas ◽  
Francisco de Assis Mollo Junior
Keyword(s):  
Flexural Strength ◽  
Acrylic Resin ◽  
Microwave Energy ◽  
Water Bath ◽  
Chemical Polymerization

scholarly journals Análise da movimentação de dentes de próteses totais polimerizadas com energia de microondas em função da sorção de água: influência da pressão e temperatura

2021 ◽  
Vol 42 (2) ◽  
pp. 41-44
Author(s):  
Célia Marisa Rizzatti-Barbosa ◽  
Paulo Sérgio Nadin
Keyword(s):  
Water Sorption ◽  
Time Pressure ◽  
Sorption Property ◽  
Acrylic Resin ◽  
Microwave Energy ◽  
Water Bath ◽  
Denture Base ◽  
Environmental Pressure ◽  
Dimensional Changes ◽  
Artificial Teeth

The processing of denture base resins may originate dimensional changes that can alter the occlusal position of artificial teeth of the concluded prosthesis. The polymerization method and the water sorption property of the acrylic resin may cause these changes. Pressure, temperature, and time of water sorption may also have influence on the previous alterations. The aim of this research was to verify the alteration of buccal cusps position of first molars on marillary dentures, polymerized by water bath (9 hours at 76ºC) and microwave energy (3 min at 500W), regarding water sorption under different conditions of time, pressure, and temperature of water storage. Sixty dentures were waxed onto metal die simulating an edentulous maxilla and divided into 4 groups (GI, GII, GIII, and GIV) of 15 samples each. Four different treatments, as follows, were applied to these samples: processing by water bath and stored in water under environmental pressure for 30 days at 37±2ºC (control -GI); processing by water bath and stored in water under 40 pounds for 1 hour at 60±2ºC (Gll): processing br microrwawe energy and stored in water under environmental pressure for 30 days at 37±2ºC(GIII): and processing by microware enerrgy and stored in water under 40 pounds for 1 hour at 60±2ºC (GIV). The degree diferences obtained between the pre and post water sorption were 0.65 for GI; 0.55 for GII; 0.83 for GIII, and -0.57 for GIV (p>0.05). There was significant alteration in the positioning of the artificial firth maxillary molars among the control and the treated storage groups, when cured by microwave energy or water bath.

scholarly journals Nanopigmented Acrylic Resin Cured Indistinctively by Water Bath or Microwave Energy for Dentures

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
L. S. Acosta-Torres ◽  
M. C. Arenas ◽  
R. E. Nuñez­-Anita ◽  
F. H. Barceló-Santana ◽  
C. A. Álvarez-Gayosso ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Methyl Methacrylate ◽  
Acrylic Resin ◽  
Microwave Energy ◽  
Water Bath ◽  
Poly Methyl Methacrylate ◽  
Transverse Strength ◽  
Acrylic Resins

The highlight of this study was the synthesis of nanopigmented poly(methyl methacrylate) nanoparticles that were further processed using a water bath and/or microwave energy for dentures. The experimental acrylic resins were physicochemically characterized, and the adherence ofCandida albicansand biocompatibility were assessed. A nanopigmented acrylic resin cured by a water bath or by microwave energy was obtained. The acrylic specimens possess similar properties to commercial acrylic resins, but the transverse strength and porosity were slightly improved. The acrylic resins cured with microwave energy exhibited reducedC. albicansadherence. These results demonstrate an improved noncytotoxic material for the manufacturing of denture bases in dentistry.

scholarly journals Acrylic resin disinfection by peracetic acid and microwave energy

2015 ◽  
Vol 63 (3) ◽  
pp. 315-318 ◽  
Author(s):  
Carmen Beatriz Borges FORTES ◽  
Vicente Castelo Branco LEITUNE ◽  
Fabrício Mezzomo COLLARES ◽  
Nélio Bairros DORNELLES JUNIOR ◽  
Stéfani Becker RODRIGUES ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Microwave Irradiation ◽  
Incubation Period ◽  
Peracetic Acid ◽  
Acrylic Resin ◽  
Microwave Energy ◽  
The Other ◽  
Disinfection Methods ◽  
Acrylic Resins ◽  
Irradiation Power

Objective: The objective of this study was to evaluate the effectiveness of disinfection methods in microwave and immersion in peracetic acid in heat-cured, self-cured and microwave-cured acrylic resin, contaminated with Candida albicans. Methods: Five specimens were prepared for each type of acrylic resin. All were infected with Candida Albicans, incubated at 37°C for 24 hours. The group which underwent microwave energy was irradiated with a power of 840W for 1 minute and the other group underwent disinfection by soaking of 0.2% peracetic acid for 5 minutes. Results: All samples proved to be contaminated after the incubation period. After the different processes of disinfection, both immersion in 0.2% peracetic acid as microwave irradiation were effective in disinfection of the 3 types of acrylic resins contaminated by Candida Albicans. Conclusion: Concluded that soaking in 0,2% peracetic acid for 5 minutes with microwave irradiation power 840W for 1 minute are effective methods for disinfecting heat-cured acrylic resin, self-cured acrylic resin and microwave-cured acrylic resin, contaminated with Candida Albicans.

scholarly journals Linear dimensional change in acrylic resin disinfected by microwave energy

2010 ◽  
Vol 9 (2) ◽  
Author(s):  
Rafael Leonardo X. Consani ◽  
Andréa Fabiana Lira ◽  
Marcelo F. Mesquita ◽  
Simonides Consani
Keyword(s):  
Room Temperature ◽  
Acrylic Resin ◽  
Dimensional Change ◽  
Conventional Technique ◽  
Microwave Energy ◽  
Reference Points ◽  
Linear Dimensions ◽  
Gypsum Mold ◽  
Before And After ◽  
Made In

The purpose of this study was to characterize the linear dimensional change in specimens made in aluminum rectangular dies (65.0x12.0x3.5mm), with 4 reference demarcations, using the Clássico, Onda-Cryl and QC-20 brands of acrylic resin. Wax patterns with 67.0x15.0x5.0mm were embedded in metallic or plastic flasks with stone gypsum, according to the conventional technique. After stone gypsum setting, the wax molds were removed and the aluminum dies impressed in the stone gypsum mold with silicone material. The powder/liquid proportion and acrylic resin were manipulated according to manufacturer’s instructions. The metallic flask pressure was achieved using the RS tension method. After polymerization in water at 74OC for 9 hours, ebullition water for 20 minutes or microwave energy (900 W) for 10 minutes, the specimens were cooled at room temperature and then removed from the flasks and submitted to conventional finishing. The distances between the A-B, C-D, A-C, and B-D reference points were measured before and after disinfection by microwave energy (650W for 3 minutes). The linear dimensional evaluation of the distances was performed by the same operator with an Olympus optical comparator microscope, with an accuracy of 0.0005mm. Obtained data were submitted to ANOVA and Tukey’s test (α=.05%). The disinfection by microwave energy did not alter the original linear dimensions of the specimens.

scholarly journals Pengaruh Desinfeksi Energi Microwave Terhadap Kekuatan Transversal Resin Akrilik Polimerisasi Panas

2019 ◽  
Vol 8 (1) ◽  
pp. 17
Author(s):  
Sefty Aryani Harahap ◽  
Lasminda Syafiar ◽  
Yosepha Yulinda Esdaria Lubis
Keyword(s):  
Testing Machine ◽  
Acrylic Resin ◽  
Electronic System ◽  
Microwave Energy ◽  
Denture Base ◽  
Mean Values ◽  
Base Materials ◽  
Test Speed ◽  
Universal Testing ◽  
One Way Anova

Disinfectant by microwave energy is highly recommended as a solution to solve the problem of chemical disinfection on denture bases. One of the denture base materials is heat cured acrylic resin. Aim, to evaluate the effect of disinfectant by microwave energy with different time on the transversal strength of heat cured acrylic resin. 30 plates (n = 6) of heat cured acrylic resin with size 65x10x2,5 mm were divided into 5 groups (control; and microwave energy disinfected for 2, 4 , 6, and 8 minutes with 650 Watts of power). Transversal strength test was carried out using Torsee's Electronic System Universal Testing Machine with a test speed of 0.1 mm / second, and a load cell of 50 kgf. Data analyzed using one-way ANOVA and LSD pos hoc. Results, there were significant differences in the transverse strength among all groups (p <0.05). Mean values of all groups were 103.59 ± 0.66 MPa; 112.02 ± 2.10 MPa; 117.48 ± 1.73 MPa; 125.46 ± 2.25 MPa; and 135.89 ± 1.56 MPa respectively. Conclusion, the longer it is disinfected by microwave energy, the higher the transversal strength of heat cured acrylic resin.

Synthesis and characterization of poly(methyl methacrylate) polymerized by microwave energy or conventional water bath

2008 ◽  
Vol 109 (6) ◽  
pp. 3953-3960 ◽  
Author(s):  
L. S. Acosta‐Torres ◽  
F. H. Barceló‐Santana ◽  
C. A. Álvarez‐Gayosso ◽  
J. Reyes‐Gasga
Keyword(s):  
Methyl Methacrylate ◽  
Microwave Energy ◽  
Water Bath ◽  
Synthesis And Characterization ◽  
Poly Methyl Methacrylate

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.

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