Abstract
Objective: The objective of this study was to evaluate in vitro the shear bond strength of two types of MIM (Metal Injection Molding) technology brackets, one with conventional mesh base and the other with rail-shaped mesh base. Materials and Methods: Forty human premolars received the bonding of 2 types of brackets: Group 1- 20 Synergy metal brackets (Rocky Mountain) with conventional mesh base and Group 2-20 H4 brackets (OrthoClassic) with rail-shaped mesh base. Both brackets were bonded with Resilience photopolymerizable resin (OrthoTechnology). The specimens were coupled to a Tinius Olsen universal test machine where the shear test was performed using a chisel. In addition, the amount of remaining resin in tooth crown with the ImageJ program was evaluated and the Adhesive Remnant Index (ARI). Intergroup comparison was performed by the independent t test and Chi-square test. Results: There was no statistically significant difference between the groups for any of the measures evaluated indicating that the mesh type of the brackets’ base with MIM technology did not influence the shear bond strength of the brackets (shear bond strength, p=0.191; maximum load registered, p=0.244). There was also no difference between the percentage (p=0.602) and area of remaining resin in the teeth (p=0.805) and IRA (p=0.625) between the Synergy and H4 groups. Conclusion: Shear bond strength was similar in the two types of brackets with MIM technology evaluated. In addition, the remaining resin in the dental enamel of two types of brackets were also similar.
Highlights
Shear bond strength was similar in the two types of brackets with MIM technology evaluated
There was no statistically significant difference between the groups for any of the measures evaluated, indicating that the mesh type of the brackets base with MIM technology did not influence the adhesive strength of the brackets
The results of the present study indicate that the shear bond strength was similar in the two types of MIM technology brackets evaluated (Table 1)
Summary
256 The Open Dentistry Journal, 2019, Volume 13 In response to these adhesion problems, brackets with different meshes at their bases were used to obtain the desired adhesive effect, i.e., a strong and durable bonding. The bases of the brackets have different configurations and designs, in order to impart greater integration of the adhesive system, increasing the mechanical retention. The orthodontic bracket must have an adhesive force sufficient to withstand masticatory forces and the activation of the mechanics used [5], the ideal adhesion force between enamel and bracket was previously described to be between 5.9 and 7.8 MPa [6]. Previous studies [6 - 8] in the literature have reported bond strength values between 2.8 and 10 MPa to achieve sufficient adhesion for the orthodontic movement, minimizing brackets’ debonding [9]. Each second of photopolymerization time and each millimeter per minute of greater crosshead speed increased bond strength by 0.077 and 1.3 MPa, respectively [7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
