Abstract
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.
Highlights
The proper maintenance of removable dental prostheses is required for users of complete denture base in order to have a pleasant aesthetics, dentures free from odors and good oral health[1].The increase in health expectancy of people was followed by an increased interest in dental treatment on the part of elderly patients who were concerned with aesthetics and with oral health[2,3]
Objetivo Avaliar a microdureza de corpos de prova das resinas acrílicas VipiCril® e Bosworth New Truliner®, antes e após, a imersão em soluções de digluconato de clorexidine a 0,12 %, hipoclorito de sódio a 1%, Corega Tabs® e água, testando a hipótese nula de que os enxaguatórios bucais e substâncias químicas utilizadas na desinfecção de próteses totais não interferem na microdureza superficial, podendo assim, serem utilizados como coadjuvantes na higiene bucal de pacientes desdentados
Métodos Foram confeccionados 60 corpos de prova da resina VipiCril® e 60 corpos de prova da resina Bosworth New Truliner® com 16mm de diâmetro por 6mm de altura, estes foram divididos randomicamente em quatro grupos de 15 amostras cada, sendo submetidos a testes de microdureza Knoop (KHN), antes e após, ciclos de imersões em soluções de digluconato de clorexidine a 0,12%, hipoclorito de sódio a 1%, Corega Tabs® e água
Summary
The proper maintenance of removable dental prostheses is required for users of complete denture base in order to have a pleasant aesthetics, dentures free from odors and good oral health[1].The increase in health expectancy of people was followed by an increased interest in dental treatment on the part of elderly patients who were concerned with aesthetics and with oral health[2,3]. Many elderly subjects are affected by diseases that limit their manual ability[3,4], requiring complementation of the mechanical cleaning with chemical substances in order to avoid the accumulation of dental microbial plaque on the oral mucosa membrane and on the surfaces of dentures, what may lead to the development of several diseases, such as candidiasis[5,6]. The chemical disinfection methods available for partial and complete denture bases may cause alteration of physical and mechanical properties of the materials used in the composition of such denture bases. Clinical characteristics such as rugosity, hardness, dimensional stability of color and bending properties can be changed after immersion in those solutions[1,11,13]
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