Influence of refreshment/activation cycles and temperature rise on the reaction rate of sodium hypochlorite with bovine dentine during ultrasonic activated irrigation

Macedo, R.; Verhaagen, B.; Wesselink, Paul R.; Versluis, Michel; Sluis, L.W.M. van der

doi:10.1111/iej.12125

Cited by 43 publications

(38 citation statements)

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“…Mechanical effects, such as acoustic streaming and cavitation, are dominant factors in ultrasonic‐activated irrigation. Moreover, ultrasonic activation could cause decomposition of the molecule and degassing of the solution, even if these mechanisms seem to have no effects on the increase of chemical efficiency (reaction rate) of NaOCl …”

Section: Discussionmentioning

confidence: 99%

Antimicrobial efficacy of cordless sonic or ultrasonic devices on Enterococcus faecalis‐infected root canals

Pedullà

Genovese

Messina

et al. 2019

J of Invest & Clin Dent

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Aim The aim of the present study was to evaluate the immediate and residual antimicrobial activity of cordless sonic or ultrasonic devices on Enterococcus faecalis (E faecalis)‐infected teeth. Methods A total of 140 single‐rooted extracted teeth with E faecalis were grouped as follows (N = 15): conventional syringe irrigation with 3% sodium hypochlorite activated by ultrasonic device (group 1) or cordless ultrasonic device (group 2), EndoActivator (group 3) or without activation (group 4), conventional syringe irrigation with sterile bi‐distilled water and ultrasonic device (group 5), EndoUltra (group 6), EndoActivator (group 7), or without activation (group 8). The remaining 20 teeth were used for positive and negative controls. Colony‐forming units (CFU) and turbidity were recorded from bacteriological samples taken before and after irrigation and after 24 hours of re‐incubation. Data were statistically analyzed using Student's t test, Mann‐Whitney test, Kruskal‐Wallis test, and Dunn's multiple comparison tests (P < .05). Results Groups 1 and 2 showed higher antimicrobial efficacy than groups 3 and 4 (P < .05). No bacteria reduction was found in groups 5‐8 (P > .05). After 24 hours, regrowth of bacteria was not significantly different for all groups (P > .05). Conclusions Ultrasound produced lower CFU and turbidity after treatment and after re‐incubation of 24 hours than sonic or no activation.

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Section: Discussionmentioning

confidence: 99%

Antimicrobial efficacy of cordless sonic or ultrasonic devices on Enterococcus faecalis‐infected root canals

Pedullà

Genovese

Messina

et al. 2019

J of Invest & Clin Dent

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“…These variables are found to be associated with mental distress in other studies [8,15], and should be adjusted for.…”

Section: Methodsmentioning

confidence: 99%

Parental divorce in late adolescence does not seem to increase mental health problems: a population study from Norway

et al. 2013

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BackgroundFormer studies have shown increased mental health problems in adolescents after parental divorce all over the Western world. We wanted to see if that still is the case in Norway today when divorce turns to be more and more common.MethodsIn a prospective study design, two samples were constituted, adolescents at a baseline survey in 2001/02 (n = 2422) and those at follow-up in 2003/04 (n = 1861), when the adolescents were 15/16 and 18/19 years-old, respectively. They answered self-administered questionnaires in both surveys of Young-HUBRO in Oslo. Early parental divorce was defined as that which occured before age 15/16 years, and late divorce occured between age 15/16 and 18/19. Internalized and externalized mental health problems were measured by the Hopkin’s Symptom Check List (HSCL-10) and the Strengths and Difficulties Questionnaire (SDQ).ResultsAfter linear regression models were adjusted for gender, ethnicity, family economy, social support, and mental health problem symptoms measured at baseline before parental divorce occured, late parental divorce did not lead to significant increase in mental health problems among adolescents in the city of Oslo. Early parental divorce was associated with internal mental health problems among young adolescents when adjusted only for the first four possible confounders.ConclusionsIt seems that parental divorce in late adolescence does not lead to mental health problems in Norway any more, as has been shown before, while such problems may prevail among young adolescents. This does not mean that parental divorce create less problems in late adolescence than before but these youths might have developed adjustment abilities against health effects as divorce have turned to be more common.

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“…In our study, the total irrigation times were limited at 40 s for each irrigation solution and irrigation-activation cycles were applied with a standardized protocol using a 5-s rest time in all root canals, according to previous investigation [30]. This timing protocol can help to prevent severe peritubular erosion [31], as well as the possible hazardous effects of temperature rise on the dentine surface, depending on the use of ultrasonics and lasers in the root canal [30,32]. Moreover, previous studies [4,6,33] have reported that NaOCl irrigation had an adverse effect on adhesion at the resin cement-dentine interface.…”

Section: Discussionmentioning

confidence: 99%

Effect of different irrigant activation protocols on push-out bond strength

Ekim

Erdemir

2015

Lasers Med Sci

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The study aimed to evaluate the effect of various final irrigant activation protocols on push-out bond strength of fiber post. Thirty-two single-rooted human maxillar central teeth were sectioned below the cementoenamel junction, instrumented and obturated. Post-space preparation was performed, and roots were randomly divided into eight groups (n = 4) according to the final irrigant activation protocols; distilled water was used as an irrigant in group 1. The other groups were treated with 2.5% NaOCl and 17% EDTA. Conventional syringe irrigation (CSI, no activation) was used in group 2. Irrigation solutions were activated using passive ultrasonic irrigation (PUI, group 3), EndoVac apical negative pressure (ANP, group 4), diode laser (group 5), neodymium:yttrium-aluminum-garnet (Nd:YAG) laser (group 6), erbium:yttrium-aluminum-garnet (Er:YAG) laser (group 7), and Er:YAG laser using with photon-induced photoacoustic streaming (PIPS™) technique (group 8). In all groups, fiber posts (White Post DC, FGM) were luted using Panavia F 2.0 (Kuraray, Osaka, Japan). The specimens were transversally sectioned, and all slices from coronal and apical regions were subjected to push-out tests. The data were calculated as megapascals and analyzed by using two-way analysis of variance followed by post hoc Tukey honestly significant difference (HSD) tests. Removing the smear layer increased the bond strength to dentine when compared with the control group (p < 0.05). The highest bond strength was obtained in the PIPS laser-activated irrigation group (p < 0.05). Coronal root region presented significantly higher bond strength than the apical region (p < 0.05). PIPS laser-activated irrigation showed higher efficiency as a final irrigant activation protocol on push-out bond strength of fiber post.

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Influence of refreshment/activation cycles and temperature rise on the reaction rate of sodium hypochlorite with bovine dentine during ultrasonic activated irrigation

Abstract: The reaction rate of NaOCl with dentine is enhanced by refreshment, ultrasonic activation and exposure time. Temperature rise of irrigant during ultrasonic activation was not sufficient to alter the reaction rate.

Cited by 43 publications

References 34 publications

Antimicrobial efficacy of cordless sonic or ultrasonic devices on Enterococcus faecalis‐infected root canals

Antimicrobial efficacy of cordless sonic or ultrasonic devices on Enterococcus faecalis‐infected root canals

Parental divorce in late adolescence does not seem to increase mental health problems: a population study from Norway

Effect of different irrigant activation protocols on push-out bond strength

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