Shear Strength of Brackets Bonded with Universal Adhesive Containing 10-MDP after 20,000 Thermal Cycles

Abstract

Objectives. e aim of this study was to evaluate the shear bond strength of metal brackets bonded with different universal adhesive systems containing 10-MDP and Transbond Plus Self Etching Primer after 20,000 thermal cycles. Materials and Methods. A total of 130 sound bovine teeth were used, which are divided into 5 groups (n = 26) according to the adhesive system used: All-Bond Universal (Bisco), Ambar Universal (FGM), Clearfil Universal Bond (Kuraray), Single Bond Universal (3M/ESPE), and Transbond Plus SEP (3M/ESPE) as control. e adhesives were applied for 20 seconds and bonded with a resin Transbond XT (3M/ESPE). After this, the teeth were submitted to 20,000 cycles at 5°C and 55°C. Afterwards, the shear bond strength test was performed in a universal test machine (Instron 3342). e adhesive remnant index (ARI) was evaluated under a stereomicroscope at 10x magnification and scanning electronic microscopy (SEM, Hitachi 3030). e shear bond strength data were submitted to One-Way ANOVA (α = 0.05) and the ARI to the Kruskal-Wallis test (α = 0.05). Results. Statistical analysis showed that the universal adhesive systems presented mean shear bond strength values similar to Transbond Plus SEP (p < 0.05). e universal adhesive presented similar ARI values among them but differed from those of Transbond Plus SEP (p < 0.001). Transbond Plus SEP presented a high ARI value when compared with the universal adhesive systems and high demineralization of enamel.Conclusions. e results show that universal adhesive systems may be used for bonding metal brackets if the orthodontist wants to maintain dental enamel health.

A comparative study on effect of different methods of recycling orthodontic brackets on shear bond strength

“…In fact the results could be different between the two study methodologies. (31) Many variables could alter bond strength values, such as thermocycling (32), enamel contamination (33) or adhesive system used (34). Therefore further research is needed in order to con rm the results of the present report.…”

A Comparative Study on the Effect of Different Methods of Recycling Orthodontic Brackets on Shear Bond Strength

“…In fact the results could be different between the two study methodologies [ 30 ]. Many variables could alter bond strength values, such as thermocycling [ 31 ], enamel contamination [ 32 ], or adhesive system used [ 33 ]. Therefore, further research is needed in order to confirm the results of the present report.…”

Effect of universal adhesive on shear bond strength of metal bracket to enamel and dental amalgam

“…Even though TXT can be regarded as a standard adhesive system in orthodontic treatment which is an agent for assessing the bond strength of new products, it shows lower SBS compared to ABU (12,19). The presence of 10MDP as a functional monomer in the universal adhesive composition is the reason for its excellent performance (11).…”

“…Besides, the occurrence of a specific functional monomer (10 MDP) can ionically bond with the calcium ions of hydroxyapatite of uncut enamel which is hypermineralized, and form a non-soluble ca 2+ salt which promotes strong adhesion (7). This chemical affinity is responsible for the low rate of dissolution and withstands ahead thermocycling (11).…”

“…The adhesive system's improvement intended to reduce technique sensitivity and decrease the chair times; in line with this tendency, the universal adhesive was introduced (9). This adhesive simplifies the bonding process and decreases the risk of damaging the enamel during debonding process (10).Acidic functional monomers such as MDP enable the bracket to endure applied forces and protect enamel integrity (11); furthermore, it is claimed that these materials can bond different tooth substrates such as enamel, dentin, amalgam, composite and porcelain (8).…”