Rebonding of unused brackets with different orthodontic adhesives

Abstract

OBJECTIVE: To compare in vitro shear bond strength (SBS) of different orthodontic adhesives in bonding and repeatedly rebonding metal brackets, and to evaluate the bond failure site with the adhesive remnant index (ARI). METHODS: Specimens consisted of 90 extracted human first premolars, randomly divided into three groups (n=30). The adhesives Alpha Plast (AP), ConciseTM (CO) and TransbondTM XT (TB) were used in each group. Three SBS tests were performed, i.e., one at T0 (initial) and the other two at T1 and T2 (first and second rebondings, respectively), observing a 24-hour interval. The tests were performed in a Shimadzu AG-I (10kN) SBS testing machine, at a speed of 0.5 mm/min. RESULTS: SBS data were subjected to ANOVA, Tukey's test and Bonferroni test (p<0.05). For the ARI, the Kruskal Wallis test was performed, followed by the Dunn test. The results revealed that at T0 groups AP and CO showed SBS values that were near, but above TB values; and at T1 and T2, the highest SBS values were observed for the AP group, followed by the CO and TB groups. CONCLUSION: Statistically significant differences were found in SBS between groups AP, CO and TB during bonding and repeated rebondings of unused metal brackets, with group AP achieving the highest SBS value. Regarding ARI, adhesive AP exhibited bond failure at the enamel-adhesive interface, with a higher enamel fracture frequency

The Influence of Resin Infiltration Pretreatment on Orthodontic Bonding to Demineralized Human Enamel

“…For the scientific purposes of this research, it was necessary to create consistent artificial lesions in order to simulate in vivo caries development. Hence, artificial demineralized lesions were created according to the recommendations of Buskes et al [21], since it is a widely used and reliable method [6,10,23,24]. The created lesions show uniform dimensions and consistent histological properties [25].…”

“…The altered enamel structure of teeth with initial caries lesions may reduce the shear bond strength (SBS) between orthodontic brackets and the enamel surface at the beginning of orthodontic treatment, as well as during treatment if the rebonding of the brackets is required [8,9]. In fact, the brackets rebonding is a regular procedure during orthodontic treatment [10] with the most common reasons for this intervention being bond failures on the part of the brackets and the need to reposition the brackets [11]. If bracket bonding is to be performed on demineralized enamel, it is advisable to stabilize and protect the demineralized enamel lesion prior to the reapplication of the brackets [12].…”

Bonding brackets on white spot lesions pretreated by means of two methods

“…Rebonding brackets is a common procedure during orthodontic treatment 19 because of the high debonding rates of orthodontic brackets resulting from mechanical and thermal stresses, or because orthodontists need to change the position of brackets. 20 White spot lesions may be found on the buccal surface of teeth during rebonding.…”

The Effect of Topical Application of Strontium on Bond Strength in Orthodontics. (In Vitro Study)

“…According to AL Anni et al (11) , preparation of different srcl 2 solutions with different concentrations the following has to be carried out A. For 50 mmol/L :dissolving 13 Group III (demineralized/SrCl2 before etching): strontium chloride solution was applied on the enamel surface of demineralized teeth by brushing for 5min,left undisturbed for 30min, rinsed , dried and then acid etched as group I. The same bracket bonding procedure was used as described for group I.…”

“…The results were summarized in Because of the high debonding rates of orthodontic brackets resulting from mechanical and thermal stresses, or because orthodontists need to change the position of brackets. (13,14) White spot lesions may be found on the buccal surface of teeth during rebonding. This would lead the orthodontist to being concerned about the adequacy of the bonding procedure to these surfaces.…”