Porosity, water sorption and solubility of denture base acrylic resins polymerized conventionally or in microwave

Influence of polishing methods on water sorption and solubility of denture base acrylic resins was studied. Eighty samples were divided into groups: Clássico (CL), and QC 20 (QC) - hot water bath cured; Acron MC (AC), and Onda Cryl (ON) - microwave cured; and submitted to mechanical polishing (MP) - pumice slurry, chalk powder, soft brush and felt cone in a bench vise; or chemical polishing (CP) - heated monomer fluid in a chemical polisher. The first desiccation process was followed by storage in distilled water at 37 ± 1ºC for 1 h, 1 day, 1, 2, 3 and 4 weeks. Concluding each period, water sorption was measured. After the fourth week, a second desiccation process was done to calculate solubility. Data were submitted to analysis of variance, followed by Tukey test (p<0.05). Means of water sorption (%) and solubility (%), respectively, were: CL-MP: 1.92 and 0.02; CL-CP: 1.98 and 0.52; QC-MP: 2.31 and -0.05; QC-CP: 2.32 and 0.25; AC-MP: 2.45 and -0.07; AC-CP: 2.43 and 0.41; ON-MP: 2.32 and -0.06; ON-CP: 2.34 and 0.27. Mechanical polishing promoted significantly lower solubility of acrylic resins; initially, water sorption values were higher for chemically polished samples, however, after 4 weeks all groups were similar.

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The effect of mechanical and chemical polishing techniques on the surface roughness of denture base acrylic resins

The Saudi Dental Journal ◽

10.1016/j.sdentj.2009.12.006 ◽

2010 ◽

Vol 22 (1) ◽

pp. 13-17 ◽

Cited By ~ 15

Author(s):

Mohammed Q. Al-Rifaiy

Keyword(s):

Surface Roughness ◽

Chemical Polishing ◽

Denture Base ◽

Acrylic Resins

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Does microwave disinfection affect the dimensional stability of denture base acrylic resins? A systematic review

Gerodontology ◽

10.1111/ger.12597 ◽

2021 ◽

Author(s):

Rodrigo Moreira Bringel Costa ◽

Helena Sandrini Venante ◽

Mariana Domingues Pordeus ◽

Ana Paula Chappuis‐Chocano ◽

Karin Hermana Neppelenbroek ◽

...

Keyword(s):

Systematic Review ◽

Dimensional Stability ◽

Denture Base ◽

Acrylic Resins

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

Brazilian Dental Journal ◽

10.1590/s0103-64402006000200007 ◽

2006 ◽

Vol 17 (2) ◽

pp. 122-125 ◽

Cited By ~ 6

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.

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Effect of repeated cycles of chemical disinfection in microhardness of acrylic resins of complete denture base

RGO - Revista Gaúcha de Odontologia ◽

10.1590/1981-863720170002000023310196 ◽

2017 ◽

Vol 65 (3) ◽

pp. 196-201

Author(s):

Elisa das Graças MARTINS ◽

Rafael Tobias MORETTI NETO

Keyword(s):

Sodium Hypochlorite ◽

Knoop Hardness ◽

Sodium Hypochlorite Solution ◽

Chlorhexidine Digluconate ◽

Water Control ◽

Denture Base ◽

Acrylic Resins ◽

Hardness Tests ◽

Before And After ◽

Edentulous Patients

ABSTRACT Objective: To evaluate the microhardness of specimens of acrylic resins VipiCril® (thermally polymerized resin) and Bosworth New Truliner® (self-polymerized resin), before and after immersion in solutions of 0.12% chlorhexidine digluconate, 1% sodium hypochlorite, Corega Tabs® and water (control), testing the null hypothesis that the mouthwashes and chemicals used to disinfect complete dentures do not interfere with the superficial microhardness, and can therefore be used as adjuncts to oral hygiene of edentulous patients. Methods: Sixty specimens of resin VipiCril®(thermally polymerized resin) and 60 specimens of resin Bosworth New Truliner® (self-polymerized resin) measuring 16 mm of diameter and 6 mm of height were prepared, which were randomly divided into four groups of 15 specimens each, undergoing Knoop hardness tests (KHN) both before and after cycles of immersion in solutions of 0.12% chlorhexidine digluconate, 1% sodium hypochlorite, Corega Tabs® and water (control). Results: The specimens of resins VipiCril and Bosworth immersed in solutions of 0.12% chlorhexidine, Corega Tabs® and water showed decreased microhardness. Conclusion: The 1% sodium hypochlorite solution caused least damage to the denture structure, not leading to decrease of the superficial microhardness.

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