Shear bond strength of a RMGIC for orthodontic bracket bonding to enamel

Abstract

Objective To evaluate the shear bond strength (SBS) of a restorative resin-modified glass ionomer cement (RMGIC) for orthodontic bracket bonding. Materials and methods One hundred twenty-one human teeth were randomly divided into 11 groups (n = 11) according to the surface treatment applied (H3PO4 ± Transbond Plus (TSEP) or Scotchbond Universal (SU)), and the adhesive used (Riva LC HV (RIVA), Fuji Ortho (FUJI), and Transbond XT (TXT)). For each sample, a metal button was bonded. SBS tests were performed at 1 week and debonded specimens were observed for failure modes determination. One-way ANOVA followed by Tukey’s post hoc test was used to compare SBS differences and Fisher’s exact test to analyze the failure modes (p < 0.05). Results TSEP + FUJI and H3PO4 + SU + TXT showed the highest SBS values while H3PO4 + TSEP + RIVA showed the lowest value. Cohesive failure and mixed failure were found in the groups with SU and TXT and adhesive failure in the other groups. Discussion/Conclusions The bonding of orthodontic attachments to enamel could be performed with any of the three materials studied. The use of a universal adhesive in the bonding protocol could optimize the adhesion values. Clinical studies would be needed to confirm the results obtained.

Comparative evaluation of the shear strength of orthodontic adhesives for fixation of brackets

“…Прочность сцепления брекетов с поверхностью зуба должна быть достаточной, чтобы выдерживать жевательные нагрузки во время коррекции прикуса. По мнению Рейнольдса и его коллег, нижняя граница адгезии, способной выдержать же-В помощь практическому врачу / To help a practitioner вательные нагрузки, составляет от 5,9 до 7,8 МПа [26][27][28], а более прочная связь 40-50 МПа увеличивает риск повреждения эмали при разъединении брекетов после лечения [29][30][31][32][33].…”