Abstract
Abstract Aim The present study examined the effect of topical fluoride treatment on the shear bond strength (SBS) of orthodontic brackets using single-dose fluoride varnishes and assessed according to different post-application times and the pattern of debond. Methods Of the 105 extracted human mandibular premolars used in the study, 70 were subjected to the SBS test and the remaining 35 to the Adhesive Remnant Index (ARI) test. The teeth were divided into a control group and six test groups: Kolorz®ClearShieldTM 5%NaFl varnish Day 1, 8, and 15; and VanishTM 5%NaFl varnish Day 1, 8, and 15. The samples were coated with their respective varnish, following which, brackets were bonded. Each specimen was subjected to a shear force in a universal testing machine until failure. Data were analysed using the analysis of variance (ANOVA). Results At all time intervals, the mean SBS of the Vanish groups was not significantly different from the control group, and the shear strength in the ClearShield groups was significantly higher than the control and Vanish groups, except at Day 8 (no difference). For the same bonding material, there was no significant difference in mean SBS over different time intervals. ARI scores showed no significant difference between the groups. Conclusion The application of single-dose fluoride varnish, irrespective of the length of time between the fluoride treatment and bonding procedure, does not negatively affect the shear bond strength of orthodontic brackets.
Highlights
Bracket bond failure is a frustrating issue that orthodontists encounter
The analysis revealed that, at all time intervals, the mean shear bond strength (SBS) of the ClearShield groups were significantly higher than that of the control group (p = 0.0172, p = 0.0240, p < 0.0001) and that the mean SBS of the Vanish groups was not significantly different from that of the control group (p = 0.9567, p = 0.9640, p = 1)
A comparison of the mean SBS between the two Vanish groups, at Day 1 and Day 15, revealed that the mean SBS of the ClearShield groups was significantly higher than that of the Vanish groups (p = 0.0013, p < 0.0001); there was no significant difference between the two varnish groups at Day 8 (p = 0.2603)
Summary
Bracket bond failure is a frustrating issue that orthodontists encounter. The average bond failure rate for practitioners in the United States reported in 2004 was approximately 5%.1. Bond failure inconveniences the patient and the orthodontic practice due to the additional cost, appointments and treatment time. It has been reported that a single bond failure may result in a 20–30 minute increase in appointment time and a cost of $70–80 to the practice.[2]. The causes of bond failure at the enamel surface include technique error, moisture contamination, excessive mechanical forces, the patient’s care during treatment, and the integrity of the enamel surface prior to bonding.[3] Previous studies have shown that
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
