J Dent Rehabil Appl Sci.  2022 Dec;38(4):185-195. 10.14368/jdras.2022.38.4.189.

Effect of storage condition of resin cement on shear bond strength of the orthodontic bracket

• Yi SG
• Kim JW
• Park SH
• Lee Y
• Kim EH
• Cho KM

• KMID: 2538516
• DOI: http://doi.org/10.14368/jdras.2022.38.4.189

Abstract

Purpose
For orthodontic bracket bonding, light curing resin cement is widely used because the process is convenient, and it can be polymerized at the desired time. This study compared the difference of bonding strength of orthodontic resin cement according to storage condition.
Materials and Methods
After acid etching the bovine enamel surface with 37% phosphoric acid, 15 orthodontic brackets for mandible incisors were bonded with Ortho Connect and Orthomite LC according to following three conditions; 1) Immediate after 4°C refrigeration for 3 months (IR), 2) One day room temperature after 4°C refrigeration for 3 months (OR), 3) Room temperature for 3 months (RT). The shear bond strength was measured with a universal material tester and failure pattern of the specimen was observed. Two-way ANOVA and One-way ANOVA were used at the 95% significance level.
Results
Ortho Connect that was applied immediately after refrigeration showed the maximum shear bond strength. Orthomite that was applied immediately after refrigeration showed the lowest shear bond strength, and the group stored at room temperature for three months showed the highest shear bond strength, and the difference between the two groups was significant.
Conclusion
Ortho Connect can be used without worrying about bond strength even if it is used immediately after refrigeration, but Orthomite should be kept at room temperature sufficiently after refrigeration.

Keyword

enamel; orthodontic bracket; resin cement; shear bond strength; storage condition