# 51. Efeito da incorporação de clorexidina nas propriedades de resinas acrílicas de rebasamento

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To evaluate the effect of chlorhexidine loading in microhardness and flexural strength of acrylic reline resins, after thermal aging. Methods: Several concentrations of chlorhexidine were selected to load three acrylic reline resins: 1%, 2.5%, 5%, and 7.5% in Kooliner, 1%, 2.5%, 5%, 7.5% and 10% in Ufi Gel Hard and 1%, 2.5% and 5% in Probase Cold. In the control group the reline resin was not loaded with chlorhexidine. Eight specimens per group (n=8) were fabricated (64x10x3.3 mm) and submitted to thermal aging (1000 cycles, 5ºC-55ºC). Knoop microhardness (30 s, 98 mN) and 3-point flexural strength (5 mm/min) tests were performed in each specimen. Results were submitted to nonparametric tests Kruskall-Wallis e Mann-Whitney (α=0.05). Results: No differences (p>0,05) were found among microhardness of Kooliner and Probase Cold loaded with the tested chlorhexidine concentrations. Ufi Gel Hard with 2.5% of chlorhexidine yielded higher (p<0,05) microhardness than the control and 7.5% chlorhexidine groups. Regarding to flexural strength, no differences (p>0,05) were observed for Kooliner and Ufi Gel Hard. Loading Probase Cold with 5% of chlorhexidine lead to lower (p=0.033) flexural strength values than control group. Conclusions: Loading Kooliner and Ufi Gel Hard with the studied concentrations of chlorhexidine does not negatively affect microhardness or flexural strength, after thermal aging. Loading Probase Cold with 5% of chlorhexidine does not affect microhardness, but leads to a decrease

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Chlorhexidine loading of acrylic reline resins – Microhardness and flexural strength after thermal aging

Rijo¹,

Pedro²,

Costa³

et al. 2018

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Microhardness and flexural strength after chemical aging of chlorhexidine delivery systems based on acrylic resin

Neves¹,

Costa²,

Nepomuceno³

et al. 2019

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To evaluate the effect of chlorhexidine incorporation on the microhardness and flexural strength of three reline acrylic resins, after a 28-day chemical aging process. Methods: Forty-eight specimens were fabricated according to the several possible combinations of acrylic reline resin and concentrations of incorporated chlorhexidine (Kooliner-0% vs. 2.5%; Ufi Gel Hard-0% vs. 5%; and Probase Cold-0% vs. 5%), to set 6 experimental groups (n=8). After a 4-week chemical aging process (pH fluctuation in artificial saliva, with cycles of 6 hours at pH=3 and 18 hours at pH=7), the Knoop microhardness (98.12 mN, 30 seconds) and flexural strength (1 kN, 5 mm/min) of all specimens were evaluated. Data were submitted to non-parametric statistical tests, according to Kruskal-Wallis and Mann-Whitney (α=0.05). Results: Chlorhexidine incorporation did not significantly affect the microhardness of the three tested resins (Kooliner-p=0.798; Ufi Gel Hard-p=0.798; and Probase Cold-p=0.195). Although chlorhexidine incorporation did not influence the flexural strength of Kooliner (p=0.959) and Ufi Gel Hard (p=0.645), the incorporation of 5% chlorhexidine in Probase Cold led to a statistically lower flexural strength than that obtained without incorporation (p=0.021). Conclusion: After chemical aging, the microhardness of chlorhexidine-incorporated acrylic resins is not affected. However, the incorporation of 5% chlorhexidine into Probase Cold negative

Surface properties after chemical aging of chlorhexidine delivery systems based on acrylic resin

Costa¹,

Bettencourt²,

Madeira³

et al. 2019

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To evaluate the effect of chlorhexidine incorporation on the surface free energy and microtensile bond strength of three reline acrylic resins, after chemical aging. Methods: For each of the studies, six experimental groups were set according to reline resin and chlorhexidine incorporation [Kooliner-0% vs. 2.5% chlorhexidine; Ufi Gel Hard and Probase Cold-0% vs. 5% chlorhexidine]. The specimens were submitted to a chemical aging process for 4 weeks (pH fluctuation in artificial saliva, cycles of 6 hours at pH=3 and 18 hours at pH=7). For the first study, 42 specimens were prepared (n=7) and, after chemical aging, the surface free energy was calculated. For the adhesive strength study, 36 denture base resin cubes were prepared and reline resin was applied to them according to the experimental group (n=6). Five sticks (1×1 mm section) were obtained from each specimen and submitted to chemical aging followed by microtensile test (1 kN; 1 mm/min). Data were analyzed with Kruskal-Wallis and Mann-Whitney non-parametric tests (α=0.05). Results: Differences (p<0.05) were observed between resins, both in surface energy and in bond strength. The chlorhexidine incorporation did not affect the surface energy of neither of the resins and also did not affect the bond strength of Kooliner and Ufi Gel Hard (p>0.05). Incorporating 5% chlorhexidine (p=0.004) decreased the Probase Cold bond strength to the denture base resin. Conclusions: After chemical aging, chlorhexidine incorporation only negatively affected the