HYBRID EVENT: You can participate in person at Rome, Italy or Virtually from your home or work.

10th Edition of International Conference on
Dentistry and Oral Health

March 13-15, 2025 | Rome, Italy
Dental 2025

Comparison of shear bond strength of rebonded stainless steel brackets with three different enamel surface conditioning methods

Saba Safarzadeh, Speaker at CE Accredited Dental Conferences
Qazvin University of Medical Sciences, Iran (Islamic Republic of)
Title : Comparison of shear bond strength of rebonded stainless steel brackets with three different enamel surface conditioning methods


Background: During the orthodontic bonding process, the need for repositioning or rebonding of orthodontic brackets on the enamel surface occurs frequently. The aim of this study is to compare the shear bond strength (SBS) in rebonding orthodontic stainless-steel brackets with three different methods of enamel surface conditioning methods. Materials and Methods: In this in vitro study, 80 human premolars that were extracted for orthodontic purposes were randomly divided into four groups and underwent orthodontic bonding procedure (N = 20). Except for the control group, three other groups underwent debonding and rebonding process in which after removing the remaining adhesive with tungsten?carbide bur, enamel surface conditioned by three different methods including re?etching with phosphoric acid, sandblasting + acid etching, and Erbium?doped Yttrium–Aluminum–Garnet laser. Then, the SBS of the bracket to the enamel surface was compared between different groups. Scanning Electron microscopy images were also obtained from a number of samples. Statistical analysis was performed by Kruskal–Wallis and Mann–Whitney tests. Results: The highest SBS was observed in the primary bond (control group) with an average of 29,440 MPa. There was a significant difference between the studied groups (P < 0.001) and only the group that was re?etched with phosphoric acid had no significant difference with the control group (P = 0.708) ∝ =0.05. Conclusion: Rebonding of brackets using phosphoric acid for reconditioning of the enamel surface creates bond strength comparable to the primary bond. Other groups had significantly lower SBS than the control group.

What will audience learn from your presentation?

  • This topic is going to enhance the concept of brackets rebonding in orthodontic clinic.
  • By improving their information about different bracket rebonding methods, they would be able to use it in their practice.
  • Yes, they could do it in same or different methods to compare them and introduce a new practical method of bracket rebond in orthodontics.
  • Yes, by improving the shear bond strength, we could reduce the number of accidental bracket debond and have a more efficient treatment.
  • It is like digging deeper layers of bonding of brackets in orthodontics


Dr. Saba Safarzadeh from Iran, born in 1992, graduated as a general dentist in 2017 from Isfahan university of medical sciences. She then passed her residency period at Isfahan university of medical sciences and graduated as an Iranian board-certified orthodontist in 2022 and obtained the position of an Assistant Professor at Qazvin university of medical sciences. She invented a special type of orthodontic tweezer which is available in my.ssaa.ir #140050340003001604.