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

The dimensional stability and durability of Acrylamide- and Methacrylate-based acrylic resins have been studied. The dimensional stability was characterized by measuring the volume expansion of samples immersed in water for a period up to 240 days or by exposing the samples to 23oC and 50 per cent, 90 per cent relative humidity and by monitoring the shrinkage. The durability was investigated by exposing the resins to cyclic variations of temperature in air and in water. The resins generally exhibit a significant volume change up to 160 per cent of the initial volume when immersed in water or exposed to a relatively dry atmosphere (23oC and 50 per cent). A general increase in the material stiffness and/or crack formation on the surface of the resin is observed. On a long-term basis, the durability of the resins may significantly vary with occasionally a partial or complete deterioration of the some resins. A general better dimensional stability and durability is observed for the Methacrylate-based resins as compared to the Acrylamide-based resins.

Download Full-text

Comparison of Water Conditioning Effects on Hardness and Dimensional Stability of Methyl Methacrylate and Polyamide Denture Base Materials

International Journal of Prosthodontics and Restorative Dentistry ◽

10.5005/jp-journals-10019-1218 ◽

2018 ◽

Vol 8 (4) ◽

pp. 114-119

Author(s):

Sahar Elkholy

Keyword(s):

Methyl Methacrylate ◽

Dimensional Stability ◽

Denture Base ◽

Base Materials ◽

Water Conditioning

Download Full-text

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.

Download Full-text