Effect of disinfection techniques on physical-mechanical properties of a microwave-activated acrylic resin

Fortes, Carmen Beatriz Borges; Collares, Fabrício Mezzomo; Leitune, Vicente Castelo Branco; Schiroky, Priscila Raquel; Rodrigues, Stéfani Becker; Samuel, Susana Maria Werner; Petzhold, César Liberato; Stéfani, Valter

doi:10.1590/0104-1428.004616

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…9 Numerous protocols have been used for microwave denture sterilization including the use of different power and time, but different studies have indicated a need for reducing the time of microwave exposure in order to reduce the side effects over a long period of use. 2,9 So in the present study, the microwave oven was used at 850W for 1min because this energy and time are capable of sterilizing the denture from Candida albicans contamination. 6,13 The findings showed that the disinfection of specimens in the microwave at 850W for 1min had a non-significant effect on the tensile strength.…”

Section: Discussionmentioning

confidence: 99%

“…This is in agreement with Fortes et al, 6 who found the protocol of microwaving at 850 W for 1min had no effect on the flexural strength of the acrylic. 2 We also used 650W for 6min, as 650W has been reported to inactivate Staphylococcus aureus, Pseudomonas aeruginosa, and spore forms of Bacillus subtilis and it is an effective method for acrylic resin disinfection. 25 In the current study, this protocol minimized the strength in comparison to other groups, in agreement with Konchada et al, 7 who reported a decrease in flexural strength values among three different acrylic resins.…”

Section: Discussionmentioning

confidence: 99%

“…To overcome that, using microwaves instead of chemical solutions is an option as it requires no special storage, has no expiration date and does not induce anti-fungal resistance. [2][3][4][5] Therefore, the use of this technique is recommended. The microwave oven power and the exposition period should be adjusted in order to produce adequate disinfection without any adverse effects.…”

Section: Introductionmentioning

confidence: 99%

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Tensile strength evaluation of acrylic after ozonated water and microwave disinfection.

Aziz

2020

J Oral Res

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Background: There is a need for safe disinfection methods without a detrimental effect on the acrylic denture base. Aim: the purpose of the current study was to evaluate the effect of ozonated water and two protocols of microwave disinfection on tensile bond strength of high-impact acrylic. Material and methods: Eighty samples were divided into four major groups: one control and three experimental groups, 20 specimens each. The experimental groups each received either disinfection by ozonated water, microwave 850W/1min, or microwave 650W/6min. Further division of the major groups into two sub-groups depending on the number of disinfection cycles and total immersion time in distilled water: One cycle and one day versus seven cycles and seven days. The control group specimens were immersed in distilled water without any disinfection for either one day or seven days. Tensile strength testing was performed on the specimens from the eight groups. The data were analyzed by SPSS version 21#. The ANOVA and Tukey-HSD multiple comparison tests were used for comparison for groups. Results: A non-significant difference in the tensile strength was observed in the groups subjected to one cycle of ozone or microwave disinfection at 850W/1min. There was a significant decrease in tensile strength for the specimens subjected to one cycle of 650W/6min microwaving. The number of testing cycles and storage time in distilled water had a significant impact on the tensile strength of the acrylic in all tested groups, by decreasing it. Conclusion: Ozone disinfection and microwaving at 850W for one minute did not affect the tensile strength of the acrylic, but repeated disinfection over seven days at one cycle per day impaired the tensile strength of the acrylic resin.

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Section: Discussionmentioning

confidence: 99%