Shear Bond Strength and Mode of Failure of Polypropylene Fibers in Orthodontic Flash-Free Adhesive

Abstract

The purpose of this research is to evaluate the effects of magnetostrictive and piezoelectric scalers on the shear bond strength (SBS), failure mode of the polypropylene fiber adhesive brackets, and the load of both scaler tips. The adhesive precoated (APC) Flash-Free brackets were placed on the buccal surfaces of sixty maxillary first premolars, which were divided into three equal groups of 20 specimens each, following the control group (no scaling), the magnetostrictive group, and the piezoelectric group. All specimens were measured for SBS value by using a universal testing machine at a crosshead speed of 0.75 mm/minute. The mode of failure was examined under a×10 magnification light microscope digital camera and scores for the adhesive remnant index (ARI) were recorded and measured load between the magnetostrictive and piezoelectric groups. For statistical analysis, ANOVA and multiple comparison, as well as unpaired t-test and chi-square tests, at the 0.05 significance level were used. The results showed that the average SBS value of the control group was greater than that of the magnetostrictive group and the piezoelectric group. However, the SBS was not significantly influenced by ultrasonic instruments (p > 0.05). The ARI score and load showed no significant differences among the groups (p > 0.05). In conclusion, the SBS of the APC Flash-Free bracket wasn’t affected by using ultrasonic instrumentation around the base of the bracket.

Modified direct orthodontic bonding metod: Effectiveness in orthodontic therapy: A retrospective clinical study

“…Improvements and innovations have mainly been focused on materials used in orthodontic therapy with fixed appliances so far. However, numerous novelties have indicated the necessity of improvements in the methods, techniques or procedures used with the aim of: reducing the initial bonding time 5 , improved accuracy of placement of brackets on teeth 6 , adequate working time of the adhesive 7 , the most optimal strength of the connection between the two adherents, which should withstand all the forces of the oral environment as well as the applied orthodontic forces, reduction of some initial bonding stages, improved patient comfort, facilitating and simplifying the work of orthodontists 8 .…”

“…Dosadašnja poboljšanja i inovacije uglavnom su bile usmerene na materijale, koji se koriste u ortodontskoj terapiji fiksnim aparatima. Međutim, brojni noviteti ukazali su na neophodnost poboljšanja i u metodama, tehnikama ili procedurama, koje se koriste sa ciljem da se: redukuje vreme inicijalnog bondiranja 5 ; poboljša preciznost postavljanja bravica na zube 6 ; dobije adekvatno radno vreme adheziva 7 ; omogući što optimalnija jačina veze između dva adherenta, koja bi trebalo da izdrži sve sile, kako oralne sredine, tako i primenjene ortodontske sile; redukuje neka od faza inicijalnog bondiranja; poboljša komfornost pacijenata; olakša i pojednostavi rad ortodonata 8 .…”

Shear Bond Strength of Polypropylene Fiber in Orthodontic Adhesive on Glazed Monolithic Zirconia

“…It was supplied, along with the bracket, in individually sealed blister packs to prevent the risk of cross-contamination. Moreover, this new technology claims to be comparable with the conventional adhesive in the aspect of shear bond strength in normal conditions or even after a load of an ultrasonic scaler was used to test it [ 15 , 16 ]. Another benefit is the reduction in chair time by eliminating the process of excessive flash removal on bonding procedures.…”