Related Experiment Video
Updated: Oct 3, 2026

Standardized Protocol to Evaluate the Effect of Surface Treatments, Luting Cements, and Thermocycling on PEEK–Composite Bond Strength
Published on: June 9, 2026
[Influence of multiple coats of bonding agent on the bond strength of amalgam bonding]
1Department of Oral Medicine, College of Stomatology, Tiedao Medical University, Shanghai 200072, China.
Objective:
To evaluate the effect of multiple coats of bond on the bond strength of amalgam bonding.
Methods:
One or two layers of Scotch-bond multi-purpose plus dental adhesive agent were applied on the dental walls of two groups of teeth respectively prior to amalgam condensation. The third group was set for control which only had amalgam filling. After one week, thermocycling, shear bond strength were tested for all specimens with 1195-Instron testing machine. Data were analyzed by SPSS 8.0. The SEM observation were made in other five modals with one or two layers bonding.
Results:
The shear strengths of two or one layer bond and control one were 25.77, 20.69 and 13.05 MPa separately. The difference among them was statistical significant (P < 0.01).
Conclusions:
The microlocking was more obvious in specimens of two bonding layers.
Related Concept Videos
Bonding and Strength of Aggregate
Chemical Bonds
Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
An ionic bond is formed due to electrostatic attraction between cations and anions. Often, the ions are formed by the transfer of electrons from...
Bonding in Metals
MO Theory and Covalent Bonding
Valence Bond Theory
Valence Bond Theory
