Effect of immersion in various disinfectant solutions on the properties of a heat-cured acrylic resin

Pereira, Cláudia Jiménez; Genari, Bruna; Leitune, Vicente Castelo Branco; Collares, Fabrício Mezzomo; Samuel, Susana Maria Werner

doi:10.1590/1981-86372019000523090

Cited by 7 publications

(16 citation statements)

References 18 publications

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“…Pereira et al 35 examined the microhardness of heat-cured acrylic resin after immersion in distilled water, domestic vinegar, 1% hypochlorite sodium, and hydrogen peroxide for 150 and 300 hours. The results showed no significant differences in the Knoop hardness between the groups.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of microhardness in two types of denture bases after using sodium hypochlorite and NatureDent disinfecting agents

Moslehifard

Ghaffari

Zarei

et al. 2022

J Dent Res Dent Clin Dent Prospects

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Background. Chemical agents, in combination with mechanical methods, play an important role in reducing microbial plaque on denture surfaces. However, these methods might change the mechanical behavior of acrylic resins, including microhardness and surface roughness. This in vitro study investigated the effect of two disinfectants, i.e., water and sodium hypochlorite, on the microhardness of conventional heat-cured and TiO2 nanoparticle-reinforced acrylic resins. Methods. Sixty acrylic resin specimens were divided into two groups, and the samples in each group were randomly assigned to three subgroups (n=10). Heat-cured specimens and 1 wt% TiO2 acrylic resin were prepared and immersed in three solutions: water, a solution prepared with NatureDent pills, and 1% sodium hypochlorite for 30, 60, and 90 days. Microhardness tests were performed on each sample at each immersion stage. The data were analyzed using descriptive statistical methods, three-way and one-way ANOVA, repeated-measures t test, and Tukey HSD tests using SPSS 17. P values<0.05 were considered significant. Results. All three independent parameters, including resin, solution, and time, significantly affected microhardness (P<0.05). The microhardness of both specimen types, i.e., conventional heat-cured and TiO2 nanoparticle-reinforced acrylic resins, immersed for 30, 60, and 90 days, was the highest and lowest in water and hypochlorite solutions, respectively. Regarding 90 days, the microhardness values of conventional heat-cured and TiO2 nanoparticle-reinforced acrylic resins were 17.050±0.094 and 19.953±0.053 in water, 15.675±0.069 and 18.965±0.037 in hypochlorite, and 16.713±0.122 and 19.39±20.113 in NatureDent solutions, respectively. Conclusion. Disinfecting two types of acrylic resin specimens decreased their microhardness as a function of immersion time for up to 90 days in the three solutions. However, the magnitude of hardness lost was less for TiO2 nanoparticles-reinforced acrylic resin.

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Section: Discussionmentioning

confidence: 99%

Evaluation of microhardness in two types of denture bases after using sodium hypochlorite and NatureDent disinfecting agents

Moslehifard

Ghaffari

Zarei

et al. 2022

J Dent Res Dent Clin Dent Prospects

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“…Absorption of water initially causes softening of the polymeric resin, which affects the frictional forces between the polymer chains. These repeated absorption-desorption cycles may eventually cause irreversible damage to the material due to hydrolytic degradation of the polymer, thereby causing the formation of microcracks [40,41]. However, these two mechanisms are highly dependent on the immersion time and the concentration of the disinfectant solutions, which might explain the varying surface roughness results in the literature [20].…”

Section: Discussionmentioning

confidence: 99%

Surface roughness analysis of prepolymerized CAD/CAM dental acrylic resins following combined surface treatments

Alfouzan

Alnouwaisar

Alazzam

et al. 2021

Materials Science-Poland

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Oral dentures are subjected to mechanical and chemical cleansing processes. However, these processes alter the physical and mechanical properties of denture acrylic resins. This study analyzes the surface roughness of conventional heat-cured (HC) polymethacrylate, light-cured (LC) urethane dimethacrylate, and prepolymerized computer-aided design/computer-aided manufacturing (CAD/CAM) dental acrylic resins. The materials were subjected to combined surface treatment of mechanical brushing, thermal cycling, and immersion in chemical disinfectants (corega, chlorhexidine gluconate [CHG], and sodium hypochlorite) to simulate 1 year of clinical use. The surface roughness of the resin specimens before and after surface treatment was evaluated using a noncontact profilometer. Statistical tests based on analysis of variance revealed significant interactions between resin type and disinfectants, indicating that the effects of these two factors were interdependent. The highest and lowest surface roughness was observed in HC resins immersed in CHG and CAD/CAM resins immersed in sodium hypochlorite. Among the materials, HC resins demonstrated the overall highest mean roughness, followed by LC and CAD/CAM resins. Regarding the disinfectant use, the highest mean roughness was observed in disks immersed in CHG, followed by those immersed in corega and sodium hypochlorite. The prepolymerized CAD/CAM acrylic resin demonstrated superior surface quality following combined surface treatments. The HC and LC resins exceeded the roughness threshold and the reported roughness values for acrylic resins following surface treatments. Among the disinfectants tested, sodium hypochlorite produced overall low roughness values.

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“…Low concentration of dodecyl methacrylate, dibutyl phthalate, benzene and toluene were observed. The leached compounds approved to have direct influence on the denture materials properties and have significant cancerogenic, allergic, teratogenic effect (16,17) .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Occlusal Pressure Pattern and Dimensional Changes of the Lined Dentures Subjected to Microwave Disinfection Protocol

Bahaa

Shabaan

2022

ADJ-for Girls

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Purpose: This study aimed to evaluate the effect of microwave disinfection protocol on dimensional changes and the pattern of occlusal pressure over lined complete dentures. Material and methods: ten completely edentulous patients were selected to receive conventional complete dentures. A layer of soft liner was added to the lower dentures and occlusal pressure contacts were recorded using T-scan device. The lower dentures were subjected to microwave radiation 700 Watt for three minutes once a week for four successive weeks in a dry condition. Twenty maxillary denture bases were constructed and lined with soft liner, the gap between the lined denture base and the stone cast was measured at the posterior palatal seal area at three different points, as well as the occlusal pattern before and after exposure to microwave radiation. Results: there were no significant effect for using microwave radiation on the lined denture regarding occlusal force distribution and dimensional changes. Conclusion: lined denture disinfection by microwave energy at 700watt for three minutes has no statistically significant effect over the dimensional changes and occlusal force distribution.

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Effect of immersion in various disinfectant solutions on the properties of a heat-cured acrylic resin

Cited by 7 publications

References 18 publications

Evaluation of microhardness in two types of denture bases after using sodium hypochlorite and NatureDent disinfecting agents

Evaluation of microhardness in two types of denture bases after using sodium hypochlorite and NatureDent disinfecting agents

Surface roughness analysis of prepolymerized CAD/CAM dental acrylic resins following combined surface treatments

Evaluation of Occlusal Pressure Pattern and Dimensional Changes of the Lined Dentures Subjected to Microwave Disinfection Protocol

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