scholarly journals Comparative evaluation of surface porosities in conventional heat polymerized acrylic resin cured by water bath and microwave energy with microwavable acrylic resin cured by microwave energy

2013 ◽  
Vol 4 (2) ◽  
pp. 147 ◽  
Author(s):  
JayantN Palaskar ◽  
Sanjeev Mittal ◽  
Sunint Singh
Keyword(s):  
Comparative Evaluation ◽  
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 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 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 A Comparative Evaluation of the Dimensional Accuracy of Heat Polymerized Acrylic Resin Denture Base Clamped by the Conventional Method and by New-press Technique and Cured by Long Curing Cycle: An in vitro Study

2012 ◽  
Vol 13 (6) ◽  
pp. 842-849
Author(s):  
T Shankar ◽  
N Venugopal Rao ◽  
Snigdha Gowd ◽  
Syed Tauqheer Ahmed ◽  
V Vinod ◽  
...  
Keyword(s):  
Conventional Method ◽  
Comparative Evaluation ◽  
Dimensional Accuracy ◽  
Acrylic Resin ◽  
Reference Points ◽  
Control Group ◽  
Denture Base ◽  
Group A ◽  
Curing Cycle

ABSTRACT Aim The aim of this study is to evaluate the dimensional accuracy of heat polymerized acrylic resin denture base clamped by the conventional method and by new-press technique and cured by long curing cycle. Materials and methods In this study, a total of 60 standardized maxillary record bases were fabricated with seven reference points as follows: • Point A Incisive papilla, • Point B and C Canine region on either side • Point E and G Midpoint of tuberosities on either side • Point F Midpoint of the line joining the two tuberosities • Point D Midpoint between the line joining A and F Group A Ten maxillary record bases were fabricated by conventional clamping method and cured by long curing cycle. Group A’ Ten maxillary record bases were fabricated by New Press or RS tension clamping method and cured by long curing cycle. The distances between the reference points, i.e. A-B, A-C, A-D, D-F, B-E, C-G, E-F, F-G, B-D, D-G, C-D, D-E of all three thermoplastic denture base plates were measured and recorded with the help of travelling microscope and were used for comparison with the measured and recorded readings of processed acrylic denture bases. The data obtained was analyzed by using the one-way analysis of variance and HSD Multiple Comparison Test. Results The overall results of the study indicate that among all the denture bases cured by the two clamping systems and the long curing cycle, group A‘ were the most dimensionally stable, followed by control group A. Conclusion The study concluded that the denture bases fabricated by the New Press method using the long curing cycle would produce the most dimensionally stable denture bases. How to cite this article Shankar T, Gowd S, Ahmed ST, Vinod V, Goud MV, Rao NV. A Comparative Evaluation of the Dimensional Accuracy of Heat Polymerized Acrylic Resin Denture Base Clamped by the Conventional Method and by New-press Technique and Cured by Long Curing Cycle: An in vitro Study. J Contemp Dent Pract 2012;13(6):842-849.

scholarly journals A Comparative Evaluation of Flexural Strength of Commercially Available Acrylic and Modified Polymethylmethacrylate: An in vitro Study

2013 ◽  
Vol 14 (1) ◽  
pp. 80-83 ◽  
Author(s):  
Naveen S Yadav ◽  
Teerthesh Jain ◽  
Amrita Pandita ◽  
SMA Feroz ◽  
UK Kartika ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Methacrylic Acid ◽  
Comparative Evaluation ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Bending Test ◽  
Control Group ◽  
Diabetic Patients ◽  
Denture Stomatitis

ABSTRACT Aim The purpose of this study was to evaluate and compare the flexural strength of commercially available acrylic (trevalone) and modified polymethylmethacrylate (PMMA). Materials and methods Four groups were tested; Group 1— control group regular MMA, group 2—2% methacrylic acid, 88% MMA, group 3—16% methacrylic acid, 84% MMA group 4— 20% methacrylic acid, 80% MMA 15 resin specimens of each group were polymerized. After processing, the specimens were subjected for flexural strength testing using three point bending test in a Universal Testing Machine. All data was statistically analyzed with one-way ANOVA, differences within the groups were analyzed by Scheffe's analysis. Results As the ratio of incorporated methacrylic acid to PMMA increased, the flexural strength decreased. Analysis of data revealed a significant decrease in flexural strength of specimens (p < 0.000) after incorporation of 12%, 16%, 20% methacrylic acid to heat polymerized acrylic resin, when compared with the control group. Lowest flexural strength was observed with specimens containing 20% methacrylic acid and highest flexural strength was observed with specimens containing conventional monomer without methacrylic acid. Conclusion It was observed that as the concentration of methacrylic acid in heat polymerized acrylic resin increases, the flexural strength decreases. Lowest flexural strength was observed with specimens containing 20% methacrylic acid and highest flexural strength was observed with specimens containing conventional monomer without methacrylic acid. Clinical significance The major advantages of addition of methacrylic acid to polymethylmethacrylate could be for the elderly people with restricted manual dexterity or cognitive disturbances, especially for patients who do not follow an adequate denture cleansing protocol and diabetic patients who are more susceptible for denture stomatitis. How to cite this article Jain T, Yadav NS, Pandita A, Feroz SMA, Kartika UK, Singh PP. A Comparative Evaluation of Flexural Strength of Commercially Available Acrylic and Modified Polymethylmethacrylate: An in vitro Study. J Contemp Dent Pract 2013;14(1):80-83.

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.

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