Related Experiment Video
Updated: Jun 23, 2026
Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Shear bond strength of ceramic brackets with different base designs to feldspathic porcelains
Buncha Samruajbenjakul1, Boonlert Kukiattrakoon
1Department of Preventive Dentistry, Prince of Songkla University, Songkhla, Thailand.
Objective:
To test the hypothesis that the there is no difference between the shear bond strengths of different base designs of ceramic brackets bonded to glazed feldspathic porcelains.
Materials And Methods:
Forty glazed feldspathic porcelain specimens (15 mm in diameter and 1.5 mm in thickness) were prepared and divided into 4 groups (n = 10). Ten pieces of each group of different ceramic bracket base designs (beads, large round pits, and irregular base) and one group of stainless steel brackets (served as a control) were bonded to glazed feldspathic porcelains under a 200 gram load. Then all samples were subjected to shear bond strength evaluation with a universal testing machine at a crosshead speed of 0.2 mm/min. Data were analyzed through one-way ANOVA and Tukey's HSD test at a .05 significance level. The mode of failure after debonding was examined under a stereoscope.
Results:
This study revealed that the beads base design had the greatest shear bond strength (24.7 +/- 1.9 MPa) and was significantly different from the large round pits base (21.3 +/- 2 MPa), irregular base (19.2 +/- 2.0 MPa), and metal mesh base (15.2 +/- 2.4 MPa). The beads base design had 100% porcelain-adhesive failure, the large round pits had 100% bracket-adhesive failure, and the irregular base design had 70% combination failure and 30% porcelain-adhesive failure.
Conclusions:
The hypothesis is rejected. The various base designs of metal and ceramic brackets influence bond strength to glazed feldspathic porcelain, but all should be clinically acceptable.
