Related Experiment Video
Updated: Mar 18, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Effect of bracket base design on shear bond strength to feldspathic porcelain
Kazem Dalaie1, Armin Mirfasihi2, Solmaz Eskandarion3
1Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Objectives:
This study sought to assess the effect of bracket base design on the shear bond strength (SBS) of the bracket to feldspathic porcelain.
Materials And Methods:
This in vitro, experimental study was conducted on 40 porcelain-fused-to-metal restorations and four different bracket base designs were bonded to these specimens. The porcelain surfaces were etched, silanized, and bonded to brackets. Specimens were thermocycler, incubated for 24 h and were subjected to SBS. Data were analyzed using Shapiro-Wilk test, Levene's test, one-way ANOVA, and Tukey's honest significant difference test. Adhesive remnant index was calculated and compared using Fisher's exact test.
Results:
One-way ANOVA showed that the SBS values were significantly different among the four groups (P < 0.001). Groups 1, 2, and 4 were not significantly different, but group 3 had significantly lower SBS (P < 0.001). Fractures mostly occurred at the porcelain-adhesive interface in Groups 1 and 2 while in Groups 3 and 4, bracket-adhesive and mixed failures were more common.
Conclusion:
The bracket base design significantly affects the SBS to feldspathic porcelain.
Related Concept Videos
Bonding and Strength of Aggregate
Mortar Properties
Brick Durability, Strength, and Appearance
Porosity in Cement Paste
The balance of water to cement in the mix is...
Brick Masonry
For thicker walls, multiple wythes are bonded together using...
Mortar Joints in Brick Masonry
The process of joint tooling is implemented as the mortar begins to harden. This technique involves compacting and shaping the mortar to enhance both the appearance and the...

