Effect of nanotechnology in self-etch bonding systems on the shear bond strength of stainless steel orthodontic brackets

Abstract

Objective: To evaluate the effect of silica dioxide (SiO2) nanofillers in different bonding systems on shear bond strength (SBS) and mode of failure of orthodontic brackets at two experimental times. Methods: Ninety-six intact premolars were divided into four groups: A) Conventional acid-etch and primer Transbond XT; B) Transbond Plus self-etch primer; and two self-etch bonding systems reinforced with silica dioxide nanofiller at different concentrations: C) Futurabond DC at 1%; D) Optibond All-in-One at 7%. Each group was allocated into two subgroups (n = 12) according to experimental time (12 and 24 hours). SBS test was performed using a universal testing machine. ARI scores were determined under a stereomicroscope. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to determine the size and distribution of nanofillers. One-way ANOVA was used to compare SBS followed by the post-hoc Tukey test. The chi-square test was used to evaluate ARI scores.Results: Mean SBS of Futurabond DC and Optibond All-in-One were significantly lower than conventional system, and there were no significant differences between means SBS obtained with all self-etch bonding systems used in the study. Lower ARI scores were found for Futurabond DC and Optibond All-in-One. There was no significant difference of SBS and ARI obtained at either time points for all bonding systems. Relative homogeneous distribution of the fillers was observed with the bonding systems.Conclusion: Two nanofilled systems revealed the lowest bond strengths, but still clinically acceptable and less adhesive was left on enamel. It is advisable not to load the brackets immediately to the maximum.

Bond Strength Survival of a Novel Calcium Phosphate-Enriched Orthodontic Self-Etching System after Various Ageing Protocols: An In Vitro Study

“…In addition to the standard 24 HW, three ageing methods were used to mimic the exposure of bonded interfaces to intraoral challenges and evaluate their effect on bond durability. During the initial orthodontic loading, early debonding was investigated to preclude the possible impact of inadequate bonding material homogeneity and incomplete polymerisation [ 27 ]. Similarly, bonding effectiveness might be affected by the hydrolytic degradation of water or the erosive capabilities of acidic drinks [ 28 , 29 ].…”

“…There was a nonsignificant effect of the different ageing models on SBS for both the control and nHAp-SEP groups. The TSEP group survived all artificial ageing protocols recording the highest mean SBS values [ 27 , 30 ]. However, bracket bonding with TSEP yielded significantly higher ARI scores with traumatic debonding after ageing (18 cracked or damaged enamel surfaces).…”

Adhesive Systems Used in Indirect Restorations Cementation: Review of the Literature

“…On the other hand, silica particles as nano-filler material have been shown to increase adhesion resistance, since they act as cross-links that promote bond strength to enamel and dentin. In this sense, nano-sized fillings lead to a total permeabilization of the junction [79]. Despite the promising results of these new versions, even more study is required to guarantee the stability of the components.…”

Shear Bond Strength of different accessories used to traction impacted teeth

“…Various devices have been designed for bonding to the enamel of a tooth to which orthodontic traction will be applied. 14,17 Choosing a device depends on individual preferences since there is no scientific proof in the literature, up to the present moment, indicating which accessory best adheres to the tooth surface, in order to avoid debonding during the application of traction and the need for a new surgical intervention. 7,8 Based on this premise, the authors' proposal in the present study was to evaluate the in vitro shear bond strength and ARI of different orthodontic accessories used for applying traction to impacted teeth.…”